Ceramic Resonator Oscillators C500 C166 Microcontroller Families
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Microcontrollers ApNote AP242401
Ceramic Resonator Oscillators C500 C166 Microcontroller Families
microcontrollers C500/C166 Family include active part oscillator. This document explains ceramic resonator oscillator functionality gives recommendations right composition external circuits. Author Peter Mariutti Munich
04.99, Rel.
Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Contents 2.3.1 2.3.2 3.2.1 3.2.2 3.2.3 6.1.1 6.1.2 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.3.1 7.3.2
Page
Introduction Differences between Quartz Crystals Ceramic Resonators Fundamental Differences Different Types Resonators Difference Start-up Oscillation Behavior Quartz Crystal Ceramic Resonator Oscillator-Inverter Oscillator-Inverter C500 Family Oscillator-Inverter C166 Family Oscillator-Inverter Type_R Oscillator-Inverter Type_LP1 Type_LP2 Oscillator-Inverter Type_RTC
Fundamental Mode Overtone Mode Oscillator Start-up Time Definition Oscillator Start-up Time tst_up Definition Oscillator Time toff Irregular Oscillation suppress spurious Oscillation wrong Overtone Modes Suppression Fundamental Oscillation Suppression Overtone Oscillation Suppression Oscillation Start-up- Oscillation Reliability Primary Proceeding determine Load Capacitance Advanced Proceeding determine Load Capacitance Stability Matrix Stability Matrix Load Capacitors Stability Matrix series damping Resistor Stability Matrix external feedback Resistor Stability Matrix Combination CX1, CX2, Analysis Loop Gain (Safety Factor) with Negative Resistance Method Principle Negative Resistance Method Procedure Loop Gain (Safety Factor) Test Application Oscillator Circuitry Layout Recommendations Avoid Capacitive Coupling Avoid Parallel Tracks High Frequency Signals Ground Supply Noise Reduction Ground Load Capacitors Correct Module Placement Layout Examples
Used Short Cuts Recommendations Ceramic Resonator Manufacturer Murata
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.1 12.2 12.2.1 12.3 12.3.1 12.4 12.4.1 12.5 12.5.1 12.6 12.6.1 12.7 12.7.1 12.8 12.8.1 12.9 12.9.1 13.1 13.2 13.2.1 13.3 13.3.1 13.4 13.4.1 13.5 13.5.1
General Information using Appendix Appendix C500 Family C500 Family: Relation between Device Type, Oscillator-Inverter Type Recommendation List C500 Family: Type_1a Oscillator-Inverter C500 Family: Type_1a Oscillator-Inverter, List C500 Family: Type_1b Oscillator-Inverter C500 Family: Type_1b Oscillator-Inverter, List C500 Family: Type_2a Oscillator-Inverter C500 Family: Type_2a Oscillator-Inverter, List C500 Family: Type_2b Oscillator-Inverter C500 Family: Type_2b Oscillator-Inverter, List C500 Family: Type_3b Oscillator-Inverter C500 Family: Type_3b Oscillator-Inverter, List C500 Family: Type_5 Oscillator-Inverter C500 Family: Type_5 Oscillator-Inverter, List C500 Family: Type_8 Oscillator-Inverter C500 Family: Type_8 Oscillator-Inverter, List C500 Family: Type_9 Oscillator-Inverter C500 Family: Type_9 Oscillator-Inverter, List Appendix C166 Family C166 Family: Relation between Device Type, Oscillator-Inverter Type Recommendation List C166 Family: Type_R Oscillator-Inverter C166 Family: Type_R Oscillator-Inverter, List C166 Family: Type_R Oscillator-Inverter C166 Family: Type_R Oscillator-Inverter, List C166 Family: Type_R Oscillator-Inverter C166 Family: Type_R Oscillator-Inverter, List C166 Family: Type_LP1 Type_LP2 Oscillator-Inverter C166 Family: Type_LP1 Type_LP2 Oscillator-Inverter, List LP1/2
Murata Sales Offices
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
AP242401 ApNote Revision History Actual Revision 04.99 Page Page actual Rev. prev.Rel. Previous Revision -Subjects (changes since last release)
trademark Murata
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Introduction
This Application Note provides basic knowledge necessary understand behavior ceramic resonator application. content concerning measurements find right external circuits general information valid pierce oscillators using oscillator-inverter. appendix includes recommendations different members C500 C166 Family. cooperation between oscillator ceramic resonator always working properly because wrong composition external circuits using resonator including capacitors with wrong values. Therefore Infineon Technologies Murata built cooperation support customers with appropriate knowledge guarantee problem-free operation oscillator. effort determination external circuits ceramic resonator oscillator much more extensive than quartz crystal oscillator. Because that Murata offers service check original customer gives recommendation right type resonator right composition external circuits.
Differences between Quartz Crystals Ceramic Resonators Fundamental Differences
physical base both components piezo electrical effect which transforms electrical power vibration. quartz crystal (also called quartz crystal resonator) consists synthetic single crystal with single polar axes. basis material ceramic resonator sintered ceramic powder. This polycrystal material with random polar axis gets polarization treatment with high voltage remain permanent polarization. following table shows general differences between quartz crystal ceramic resonator. claims complete!
Table General Differences between Quartz Crystals Ceramic Resonators Ceramic Resonator Price Factor (depends quality) Frequency Tolerance over Mechanical Shock Resistance Tank Overtone Oscillation Tendency spurious Oscillation Integrated Caps available Drive Level Dependence R1(DLD) Drive Level free Circuit Design high very good high Quartz Crystal good
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
table below rough overview about principle technical differences between quartz crystal ceramic resonator concerning frequency tolerance start-up behavior. values table given (10-6) refer specified frequency component. included values rough estimations! detailed information please refer specifications components.
Table Principal technical Differences between Quartz Crystals Ceramic Resonators Ceramic Resonator Aging (for years room temperature) Initial Frequency Tolerance Temperature Characteristics Load Capacitance Characteristics Oscillation Rise Time Quality Factor (Qm) 3000 2000 5000 ppm/°C ppm/pF 0.01 msec 5'000 Quartz Crystal ppm/°C ppm/pF msec
Different Types Resonators
Quartz crystals frequency range from 1MHz 40MHz offered fundamental mode overtone mode. overtone mode typically used clock frequency higher than because safety factor mechanical stability. quartz crystals offered with integrated load capacitors. Ceramic resonators same frequency range typically used overtone mode clock frequency higher than 12MHz. ceramic resonator used overtone mode needs tank circuit. ceramic resonators also offered with integrated load capacitors. These devices called terminal types. ceramic resonators without integrated capacitors called terminal types. figure below. terminal type used most cost applications problem during evaluation that possible vary lower values than already integrated ones. Murata uses analysis special resonators without integrated capacitors with same electrical parameters terminal type. This main reasons customer able perform complete analysis oscillator reliability. Note: typical electrical characteristic ceramic resonators differ from type type. Therefore each different type ceramic resonator analysis start-up oscillation reliability made.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Difference Start-up Oscillation Behavior
Based physical difference between quartz crystals ceramic resonators there different analysis methods necessary.
2.3.1 Quartz Crystal main problem characterize start-up oscillation reliability drive level dependency (DLD) overall tolerance oscillator circuitry. During start-up time drive level oscillation very small increased maximum. During that time resistance crystal reach very high values because crystals show resistance dips depending drive level temperature. This effect called drive level dependence. quartz crystal depends quality alter during production during life time crystal. resistance dips crystal increase range where loop gain oscillator lower than one, then oscillation cannot start. test start-up oscillation reliability done with 'negative resistance' method. ApNote 2420xx describes perform this test
2.3.2 Ceramic Resonator ceramic resonator shows Therefore depends only variation production. main problem characterize start-up oscillation reliability ceramic resonator tendency irregular oscillation. This called 'spurious' oscillation ceramic resonator based ability oscillate overtone without tank. tank consists additional external capacitance inductance suppress oscillation fundamental mode. impedance shows maximum overtone ceramic resonator running overtone. impedance fundamental overtone smaller than overtone. overton response (main response) larger than fundamental one. Depending gain phase oscillator circuit (µC, external circuit parasitics PCB) spurious oscillation occur. Therefore most evaluation effort spent check tendency spurious oscillation. Note: Long wiring tends support spurious oscillation increasing inductance!
Terminal Type Terminal Type
Figure Terminal Type Terminal Type Ceramic Resonators
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Oscillator-Inverter
microcontrollers C500/C166 Family include active part oscillator (also called oscillator-inverter). Based history evolution microcontrollers there different oscillator-inverters implemented C500/C166 Family members. same reason, meaning XTAL1 XTAL2 pins different. this Application Note C166 Family, XTAL1 oscillator-inverter input while XTAL2 output. C500 Family recommended have closer look Data Sheet each device. on-chip oscillator-inverter either with external ceramic resonator appropriate external oscillator circuitry (also called passive part oscillator) driven external oscillator. external oscillator directly connected XTAL1, leaving XTAL2 open, feeds external clock signal internal clock circuitry. oscillator input XTAL1 output XTAL2 connect internal CMOS Pierce oscillator external ceramic resonator. oscillator provides inverter feedback element. resistance feedback element range from Depending type oscillator-inverter gain different during after reset. appendix gives separate recommendations each oscillator-inverter type.
Oscillator-Inverter C500 Family
Based history increasing frequency there many different oscillator-inverter types. oscillator-inverter types differ gain frequency. gain these types oscillator-inverters same during reset active reset inactive. These oscillators optimized operating frequencies range from (3.5) (40) MHz. details refer appendix Data Sheets.
Oscillator-Inverter C166 Family
oscillator-inverters C166 Family distinguished groups standard oscillatorinverters frequencies MHz, Power oscillator-inverters power consumption Real Time Clock oscillator-inverters frequency range 32.768 50%.
3.2.1 Oscillator-Inverter Type_R This type inverter implemented most current C166 Family derivatives. gain Type_R oscillator-inverter high during reset active Reduced one-third when reset inactive. This feature provides excellent start-up behavior reduced supply current oscillator during normal operation mode. Type_R oscillator-inverter optimized operating frequency range MHz.
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3.2.2 Oscillator-Inverter Type_LP1 Type_LP2 This type inverter Power oscillator, version version Inverter Type_LP2 actual version will implemented derivatives C166 Family with power management. Type_LP oscillator-inverter high sophisticated module with high gain power consumption. gain Type_LP oscillator-inverter same during reset active reset inactive. This oscillator-inverter optimized operating frequency range from MHz. input frequencies above provided external oscillator oscillator's output (XTAL2) should terminated with capacitance resistor series GND. 3.2.3 Oscillator-Inverter Type_RTC auxiliary oscillator-inverter Real Time Clock oscillator with power consumption optimized frequency range 32.768 50%. This oscillator only used with quartz crystal because load capacitance ceramic resonator high.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Fundamental Mode Overtone Mode
ceramic resonators recommended appendix used fundamental mode overtone mode. detailed information have look specification ceramic resonator. already mentioned ceramic resonator needs tank overtone mode. standard external oscillator circuitry fundamental mode overtone mode, figure below, includes ceramic resonator, capacitors CX2, feed back resistor reduce gain series resistor vary gain phase. feed back resistor series resistor always used. need depends oscillator frequency, type ceramic resonator, application system. test resistor temporarily inserted measure loop gain oscillator circuitry. principle check start-up reliability will explained detail later.
Fundamental Mode Overtone Mode: MHz)
internal clock circuitry Rfint
XTAL1 (XTAL2)
XTAL2 (XTAL1)
Figure Oscillator Circuitry Fundamental Mode Overtone Mode
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Oscillator Start-up Time
Based small electrical system noise thermic noise caused resistors, oscillation starts with very small amplitude. amplification oscillator-inverter, oscillation amplitude increases reaches maximum after certain time period tst_up (start-up time). Typical values start-up time ceramic resonator within range 0.01 msec tst_up msec. Theoretically oscillator-inverter performs phase shift 180°, external circuitry performs phase shift 180° fulfill oscillation condition oscillator. total phase shift 360° necessary. reality, phase shift oscillator-inverter depends oscillator frequency approximately range 100° 210°. necessary compose external components that total phase shift 360° performed. This achieved variation external components. Note: external hardware reset signal active longer time period than oscillator start-up time order prevent undefined effects. Note: Because different gain some oscillator-inverters during reset active reset inactive recommended consider oscillation both phases reset signal. Further application system activity starting after reset inactive have influence oscillator.
Definition Oscillator Start-up Time tst_up
definition oscillator start-up time well defined value literature. Generally depends power supply rise time (dVDD/dt) power electrical system noise, oscillation amplitude. this Application Note oscillator start-up time tst_up defined from VDD/2 0.9*VOSC_max stable oscillation, figure below.
Supply Voltage XTAL2 Output
VDD/2
0.9*VOSC_max
Signal XTAL2 Output
VOSC_max
tst_up Figure Oscillator Start-up Time
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Definition Oscillator Time toff
Measurement oscillator start-up time normally done periodically. After switching power supply, oscillation continues until whole reactive power oscillating between inductance capacitance consumed. Therefore time between switching power supply (toff) must short order reproduceable results otherwise start-up times differ very much. toff depends composition oscillator components. recommended oscillation time toff sec, figure below.
toff Figure Oscillator Time toff
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Irregular Oscillation
tendency ceramic resonator irregular oscillation based different effects classified types. First oscillation spurious response ceramic resonator. This spurious response fundamental mode oscillation overtone mode oscillation ceramic resonator specified overtone mode. Second oscillation were ceramic resonator works just capacitor oscillation. Replacing ceramic resonator with capacitor approximately same value static capacitance ceramic resonator shows same oscillation frequency ceramic resonator this oscillation frequency specified one. Below different methods eliminating chance irregular oscillation ceramic resonator.
suppress spurious Oscillation wrong Overtone Modes
Ceramic resonators designed overtone mode have more chance irregular oscillation existence both, fundamental overtone spurious responses.
6.1.1 Suppression Fundamental Oscillation case spurious oscillation fundamental mode loop gain phase shift oscillator (active passive part) small overtone mode. countermeasure increase both parameters. This done with following methods:
Using smaller values load capacitors Using smaller value internal feedback resistor Rfint adding external feedback
resistor within range
6.1.2 Suppression Overtone Oscillation case spurious oscillation overtone mode loop gain overtone decreased with following methods:
Using higher values load capacitors Adding series resistor (damping resistor, increase
value. Because reduces loop gain. Furthermore work pass filter.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Suppression Oscillation
ceramic resonator works just capacitor then changing external circuit condition disable this irregular oscillation. This achieved
Change values loading capacitors with relation Change values loading capacitors with relation series damping resistor external feedback resistor
solution found re-layout might required. Note: small inductance printed pattern (oscillator) enable oscillation creating oscillation high frequency. such cases, appears circuit does start-up when powered however, small solve problem.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Start-up- Oscillation Reliability
check start-up oscillation reliability oscillation circuit done verification oscillation frequency, oscillation wave form, oscillation voltage, starting voltage loop gain variation temperature supply voltage. results analysis summarized table find area with stable conditions reliable oscillation. first step determine values load capacitors second step start-up oscillation reliability checked Safety Factor, chapter 7.3. This Application Note offers ways determine load capacitance. 'primary way' which done with typical sample 'advanced way' which done with called 'worst case ceramic resonator' with maximum values specified equivalent circuit constants. advanced only performed primary does result acceptable behavior. appendix includes recommendations right composition external circuits relating different microcontrollers ceramic resonators. These recommendations used standard PCBs standard environment. microcontrollers ceramic resonators where recommendations available appendix following description shows possibility find appropriate external circuits first prototypes used evaluation.
Note: analysis only performed terminal type ceramic resonator (with built loading capacitors). terminal type with integrated loading capacitors cannot applied this analysis because variation loading capacitors only performed down integrated values possible perform negative resistance method check loop gain. Murata uses special terminal type samples analysis were load capacitors integrated. want perform terminal type analysis please contact Murata help! Note: easy find physical ceramic resonator sample having specified limit conditions application system, which worst main response large spurious. possible simulate limit conditions application system adding external components ceramic resonator this costs additional analysis efforts. Because knowing difficulty getting such device Murata offers service analyzing customer systems.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Primary Proceeding determine Load Capacitance
Depending available equipment there different strategies find appropriate load capacitors combination with ceramic resonator. primary determine load capacitance check following characteristics with parameter variable:
Oscillating voltage XTAL1 XTAL2 (VPP_XTAL1 VPP_XTAL2). Oscillating voltage wave form XTAL1 which should distorted range input
threshold (Vdd 2).The best form sine.
Starting voltage, minimum supply voltage that oscillation starts. Start-up time oscillation, tst_up.
results analysis transferred table. example shown table below. yellow shaded columns show range recommended values. matching load capacitances column which gives best values above mentioned characteristics:
High oscillation voltage. Both VPP_XTAL1 VPP_XTAL2 should large inside
specification. high than worse.
Minimum wave form distortion. Minimum supply starting voltage. Minimum start-up time, tst_up.
Note: measurements should performed with oscilloscope including active probes with small capacitive load high impedance.
Table Table Load Capacitance Analysis with Example measured Values [pF] VPP_XTAL1 VPP_XTAL2 Wave Form Starting Voltage Start-up Time [µsec]
1801)
1302)
1602)
2002)
start-up time constant! oscillation starts fundamental about µsec starts then again overtone!
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Advanced Proceeding determine Load Capacitance
primary analysis does result acceptable behavior then Murata uses advanced analysis find right composition external circuits. This analysis done with typical worst case samples evaluation done stability matrix. principle stability matrix explained next chapter. analysis sequence shown below starts with stability matrix without damping resistor without external feedback resistor matching result found then stability matrix generated. result also does then stability matrix done. very seldom cases steps before show matching result. Then stability matrix combination CX1, CX2, generated.
Stability Matrix Results Stability Matrix Results CX1,2 Stability Matrix Results CX1,2 other combination and/or Stability Matrix CX1, with and/or FAIL FAIL FAIL
Loop gain test (negative resistance analysis)
Figure Advanced right Composition external Circuits
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
7.2.1 Stability Matrix stability matrix (also called stability oscillation area) analysis where desired values changed results analysis summarized table which called stability matrix. stability matrices include following information:
Table Content Stability Matrices Symbol CX1, Description Values load capacitors Damping resistor Feed back resistor Recommendable values Stable oscillation, (VDD when oscillation starts) oscillation Fundamental oscillation overtone oscillation overtone oscillation oscillation oscillation amplitude small Wave form distortion oscillation signal Range VDDmax -0.3 VPP_XTAL1
(ok) (VDD value) small
stability matrix analysis supply voltage increased starting from VDDmax very small steps. During that time parameters stability matrix observed noted stability matrix. recommended value stability matrix also accuracy frequency, behavior during variation temperature, start-up time should measured.
7.2.2 Stability Matrix Load Capacitors This stability matrix used find right values CX2. These capacitor values needed calculation ceramic resonator load capacitance. each possible combination stability matrix measurement analysis performed. Each result transferred stability matrix. After measurement result ('') appropriate values found when distance stability matrix from stable oscillation irregular oscillation large enough.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Table Example Stability Matrix Characteristics) CX2\CX1[pF] small small small small small small small small small small small
7.2.3 Stability Matrix series damping Resistor This stability matrix used find appropriate value oscillator circuit shows spurious oscillation variation CX1/CX2 does solve problem. proceeding identical stability matrix analysis described chapter above. recommended values within range table below shows example stability matrix with characteristics. Table Example Stability Matrix Characteristics) 0.47 small
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
7.2.4 Stability Matrix external feedback Resistor This stability matrix used find appropriate value oscillator circuit shows spurious oscillation variation does solve problem. proceeding identical stability matrices described chapters above. recommended values within range 100k. table below shows example stability matrix with characteristics. Table Example Stability Matrix Charcteristics)
7.2.5 Stability Matrix Combination CX1, CX2, stability matrices CX\CX2, CX=CX2\Rx2 CX=CX2\Rf result reliable oscillation then stability matrix combination CX1, CX2, performed. Depending results stability matrices before, parameters instance values others used variables analysis dimensional stability matrix. this very seldom case only mentioned completeness.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Analysis Loop Gain (Safety Factor) with Negative Resistance Method
This well-known method also used test start-up oscillation reliability quartz crystals. result this analysis safety factor which gives feeling about start-up oscillation reliability. This important assess loop gain when tolerances concerned parts oscillator worst case values. Note: negative resistance method only performed with terminal type ceramic resonator else result includes only values higher equal than integrated ones terminal type.
Oscillator Circuit Microcontroller
Equivalent Circuit Oscillator Circuit
Rfint
-RINV
Figure Equivalent Circuit Negative Resistance Methode
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
7.3.1 Principle Negative Resistance Method oscillator divided into on-chip oscillator-inverter external circuitry. oscillator circuitry simplified shown figure load capacitance contains CX1, stray capacitance amplification ability oscillator-inverter replaced with negative resistance -RINV ceramic resonator replaced with load resonance resistance (effective resistance) effective reactance condition required oscillation
negative resistance large enough cover possible variation oscillator circuitry. This condition necessary guarantee problem-free operation oscillator. negative resistance analyzed connecting series test resistor ceramic resonator (see fig. used find maximum value RQmax that remains circuit still oscillating. resistance ceramic resonator oscillating frequency creates power dissipation. calculated shown below. C0is shunt capacitance ceramic resonator. typical value stray capacitance normal system
Negative Resistance:
Qmax
Load Resonance Resistance: (Effective Resistance)
Load Capacitance:
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
7.3.2 Procedure Loop Gain (Safety Factor) Test Application When values CX1, CX2, already qualified then analysis Safety Factor performed. This done with typical ceramic resonator variation temperature supply voltage. analysis system (oscillator) periodically switched shown figure chapter 'Oscillator start-up Time'. value increased until oscillation does start more. From state oscillation then decreased until oscillation starts again. This final value (RQmax) used further calculations Safety Factor principle analyze calculate safety factor shown ApNote 2420xx. calculation Safety Factor ceramic resonator requires also equivalent circuit constants device. Because knowing problems real values test ceramic resonator this ApNote offers minimum value (RQmin). rough estimation start-up reliability used during evaluation sufficient when measured maximum (RQmax) least value RQmin shown table below. primary results more different values load capacitors then configuration with measured maximum resistor selected application.
Table Ceramic Resonator Types recommended RQmin Type CSA4.00MG CSA8.00MTZ CSA10.0MTZ CSA20.00MXZ040 CSACV20.00MXJ040 [pF] CSA40.00MXZ040 CSACV40.00MXJ040 RQmin 1400
Note: RQmin values table only evaluation systems show order this values. Safety Factor final board mass production should verified Murata.
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Preliminary Values
1400
Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Oscillator Circuitry Layout Recommendations
layout oscillator circuit important behavior design. this recommendation help reduce problems caused layout. This design recommendation optimized noise aspects. optimal layout following items have noted:
Avoid Capacitive Coupling
crosstalk between oscillator signals others minimized. Sensitive inputs have separated from outputs with high amplitude. Note: crosstalk between different layers also analyzed.
Avoid Parallel Tracks High Frequency Signals
order reduce crosstalk caused capacitive inductive coupling, tracks high frequency signals should routed parallel (also different layers!).
Ground Supply
ground supply must realized base impedance. impedance made smaller using thick wide ground tracks. Ground loops have avoided, because they working like antennas.
Noise Reduction Ground Load Capacitors
Noise ground track between load capacitors on-chip oscillator ground have influence duty cycle. This important systems running direct drive mode (oscillator frequency equal frequency). Therefore ground connection decoupling capacitance (between on-chip oscillator-Inverter) should between system ground connection, suppress noise from system ground.
Correct Module Placement
Other modules should placed near oscillator circuitry order prevent them from influencing ceramic resonator functionality.
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Layout Examples
Microcontroller
Connection system system
Connection system ground Decoupling capacitance back side ground island system ground
XTAL1
XTAL2
Single ground island
terminal type ceramic resonator
Vias ground island
Figure Layout Example Terminal Type Ceramic Resonator with
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Microcontroller
Connection system system
Connection system ground Decoupling capacitance back side ground island system ground
XTAL1 Single ground island
XTAL2
inserted here
Vias ground island
terminal type ceramic resonator
Figure Layout Example Terminal Type Ceramic Resonator without
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Used Short Cuts Shunt capacitance ceramic resonator (static capacitance). Motional capacitance ceramic resonator (dynamic capacitance). Mechanical equivalent elasticity ceramic element. Load capacitance ceramic resonator system. Stray capacitance system. Load capacitors Decoupling capacitance Printed Circuit Board (PCB). Depending behavior typ. values range Motional inductance ceramic resonator (dynamic inductance). Mechanical equivalent oscillating mass ceramic element. Effective reactance Ceramic resonator Negative resistance: amplification ability on-chip oscillator-inverter. Series resistance ceramic resonator (resonance resistance other technical descriptions also called: 'equivalent series resistance, ESR' 'transformed series resistance'). Mechanical equivalent molecular friction, damping mechanical mounting system acoustical damping filled housing. Load resonance resistor other technical descriptions also called: 'effective resistance'). Test resistor test loop gain calculation safety level. Maximum value test resistor which does stop oscillation. Resistor which controls drive level (damping resistor). Additional external feedback resistor. Internal feedback resistor. Safety Factor Start-up time oscillator. Oscillator time measurement start-up behavior.
CX1,
RINV
RQmax Rfint tst_up toff
Figure Equivalent Circuit Ceramic Resonator
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Recommendations Ceramic Resonator Manufacturer Murata
preceding chapters have shown principle find appropriate values circuit components ceramic resonator oscillator circuitry which ensure problem-free operation. Similar tests were done cooperation between Infineon Technologies Murata. Results available different Infineon Technologies microcontrollers. specialists from Murata have done analyses with microcontroller development group Infineon Technologies. results this cooperation presented appendix this Application Note. cooperation will continued further results will added this Application Note step step. Because knowing effort necessary find right composition external circuit right type ceramic resonator, Murata offers service check original customer gives recommendation right type resonator appropriate external circuits.
Note: appendix shows recommendations appropriate circuit composition oscillator which most applications recommended service Murata because every design have specific influences oscillator (noise, layout etc.).
General Information using Appendix
Appendix includes general recommendations right composition external circuits C500 Family C166 Family. Each recommendation external circuits only more different possibilities. decision which composition right one, 'digital' done 'analog' which offers more different results which fits system. Depending system demands different criteria have considered: safety factor (loop gain), start-up behavior, ceramic resonator specification, frequency, EMC, layout demands etc. These facts base trade-off which external circuits best individual application system. general recommendations appendix based safety margin concerning loading capacitance variation more. This necessary because appendix includes general recommendations recommendations fitting specific application. Recommendations specific application only obtained from analysis respective system (support offered Murata).
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Appendix C500 Family
derivatives, steps oscillator-inverter types C500 Family shown table below included recommendations following pages. each type oscillator-inverter there proposal right composition external circuits referred different frequencies. Note: recommendation lists always include values whole frequency range oscillator-inverter. Because these general recommendations based safety margin concerning loading capacitance variation more. analysis specific application allow higher frequency oscillator-inverter.
12.1 C500 Family: Relation between Device Type, Oscillator-Inverter Type Recommendation List
Table C500 Family Derivatives, Oscillator-Inverter Type Recommendation List Device SAH-C515C-LM/-8RM SAF-C515C-8EM SAF-C505C-LM SAF-C509-LM SAB80C517A-N18-T3 SAK-C505CA-4EM SAB-C504-2EM SAB-C513A-2RN SAB80C517A-N18 SAB80C537-N T40/110 Step Inverter List
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.2 C500 Family: Type_1a Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_1a Oscillator-Inverter compatible List Device SAH-C515C-LM/-8RM Step Oscillator Frequency
12.2.1 C500 Family: Type_1a Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_1a oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_1a Oscillator-Inverter Type_1a Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA10.0MTZ CST10.00MTW CSAC4.00MGC CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG0H6 CSACV10.0MTJ CSTCC10.0MG [pF] (30) (30) (30) (47) (47) (15) open open open open open open open open open open open open Package
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Leaded
Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.3 C500 Family: Type_1b Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_1b Oscillator-Inverter compatible List Device SAF-C515C-8EM Step Oscillator Frequency
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.3.1 C500 Family: Type_1b Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_1b oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_1b Oscillator-Inverter Type_1b Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type 2MHz 4MHz 6MHz 8MHz 10MHz 2MHz 4MHz 6MHz 8MHz 10MHz CSA2.00MG040 CST2.00MG040 CSA4.00MG CST4.00MGW CSA6.00MG CST6.00MGW CSA8.00MTZ CST8.00MTW CSA10.0MTZ CST10.0MTW CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC CSTCC4.00MG0H6 CSAC6.00MGC CSTCC6.00MG CSACV8.00MTJ CSTCC8.00MG CSACV10.0MTJ CSTCC10.0MG [pF] 100pF (100pF) 30pF (30pF) 30pF (30pF) 30pF (30pF) 30pF (30pF) 100pF (30pF) 30pF (47pF) 30pF (15pF) 30pF (15pF) 30pF (15pF) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open 2.2k Package
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Leaded
Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.4 C500 Family: Type_2a Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_2a Oscillator-Inverter compatible List Device SAF-C509-LM SAF-C505C-LM SAB80C517A-N18-T3 Step Oscillator Frequency 16/20 18/24
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.4.1 C500 Family: Type_2a Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_2a oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_2a Oscillator-Inverter Type_2a Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type 2MHz CSA2.00MG040 CST2.00MG040 CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA12.0MTZ CST12.00MTW CSA16.00MXZ040 CST16.00MXW0C3 CSA18.00MXZ040 CSA20.00MXZ040 CSA24.00MXZ040 CST24.00MXW0H1 [pF] 100pF (100pF) (30) (30) (30) (15) Open Open open open open open open open open open open open open open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Table Recommendation List external circuitry used with Type_2a Oscillator-Inverter (continued) 2MHz CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 CSACV16.00MXJ040 CSACV18.00MXJ040 CSACV20.00MXJ040 CSTCV20.00MXJ0H1 CSACV24.00MXJ040 CSTCV24.00MXJ0H1 100pF (30pF) (47) (47) (22) Open Open open open open open open open open open open open open open 2.2k
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.5 C500 Family: Type_2b Oscillator-Inverter table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_2b Oscillator-Inverter compatible List Device SAK-C505CA-4EM Step Oscillator Frequency 16/20
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.5.1 C500 Family: Type_2b Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_2b oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_2b Oscillator-Inverter Type_2a Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA12.0MTZ CST12.00MTW CSA16.00MXZ040 CST16.00MXW0C3 CSA18.00MXZ040 CST18.00MXW0H3 CSA20.00MXZ040 CST20.00MXW040 CSAC4.00MGC(M) CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 CSACV16.00MXJ040 CSACV18.00MXJ040 CSACV20.00MXJ040 [pF] (30) (30) (30) (15) (15) (15) (47) (47) (22) open open open open open open open open open open open open open open open open open open open open open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.6 C500 Family: Type_3b Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_3b Oscillator-Inverter compatible List Device SAB-C504-2EM Step Oscillator Frequency
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.6.1 C500 Family: Type_3b Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_3b oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_3b Oscillator-Inverter Type_3b Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA3.50MG040 CST3.50MGW040 CSA4.00MG040 CST4.00MGW040 CSA8.00MTZ040 CST8.00MTW040 CSA12.0MTZ CST12.0MTW CSA16.00MXZ040 CST16.00MXW040 CSA20.00MXZ040 CST20.00MXW0H4 CSA24.00MXZ040 CST24.00MXW040 CSA32.00MXZ040 CSA40.00MXZ040 CSAC3.50MGC040 CSTC3.50MG CSAC4.00MGC040 CSTCC4.00MG0H6 CSACV8.00MTJ040 CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] 100pF (100pF) 100pF (100pF) 100pF (100pF) 30pF (30pF) 30pF (30pF) 22pF (22pF) 15pF (15pF) 10pF 100pF (30pF) 100pF (47pF) 100pF (47pF) 30pF (22pF) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open 3.3k Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.7 C500 Family: Type_5 Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_5 Oscillator-Inverter compatible List Device SAB-C513A-2RN Step Oscillator Frequency
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.7.1 C500 Family: Type_5 Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_5 oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_5 Oscillator-Inverter Type_5 Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA4.00MG040 CST4.00MGW040 CSA8.00MTZ CST8.00MTW CSA10.0MTZ CST10.00MTW CSA12.0MTZ CST12.00MTW CSAC4.00MGC(M)040 CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG0H6 CSACV10.0MTJ CSTCC10.0MG CSTCC10.0MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] (100) (30) (30) (30) (47) (47) (15) (47) (22) open open open open open open open open open open open open open open open open open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.8 C500 Family: Type_8 Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_8 Oscillator-Inverter compatible List Device SAB80C517A-N18 Step Oscillator Frequency
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.8.1 C500 Family: Type_8 Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_8 oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_8 Oscillator-Inverter Type_8 Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA12.0MTZ CST12.00MTW CSA16.00MXZ040 CSA18.00MXZ040 CSAC4.00MGC(M) CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG CSACV12.0MTJ CSTCV12.0MTJ0C4 CSACV16.00MXJ040 CSTCV16.0MXJ0C1 CSACV18.00MXJ040 CSTCV18.0MXJ0C1 [pF] (30) (30) (30) (47) (15) (22) open open open open open open open open open open open open open open open open open open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
12.9 C500 Family: Type_9 Oscillator-Inverter
table below shows derivatives which compatible recommendation List
Table C500 Family Derivatives including Type_9 Oscillator-Inverter compatible List Device SAB80C537-N T40/110 Step Oscillator Frequency
12.9.1 C500 Family: Type_9 Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_9 oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_9 Oscillator-Inverter Type_9 Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA12.0MTZ CST12.00MTW CSA16.00MXZ040 CSAC4.00MGC(M) CSTCC4.00MG0H6 CSACV8.00MTJ CSTCC8.00MG CSACV12.0MTJ CSTCV12.0MTJ0C4 CSACV16.00MXJ040 CSTCV16.0MXJ0C1 [pF] (30) (30) (30) (47) (15) (22) open open open open open open open open open open open open open open open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
Appendix C166 Family
derivatives, steps oscillator-inverter types C166 Family shown table below included recommendations following pages. each type oscillator-inverter there proposal right composition external circuits referred different frequencies. Depending technology devices there different recommendation lists inverter type. Note: recommendation lists always include values whole frequency range oscillator-inverter. Because these general recommendations based safety margin concerning loading capacitance variation more. analysis specific application allow higher frequency oscillator-inverter.
13.1 C166 Family: Relation between Device Type, Oscillator-Inverter Type Recommendation List
Table C166 Family Derivatives, Oscillator-Inverter Type Recommendation List Device SAx-C163-16F25F SAx-C165-LF SAx-C165-LM SAx-C167-LM SAx-C167S-4RM SAx-C167SR-LM SAx-C167CR-LM SAx-C167CR-4RM SAx-C167CR-16RM C161RI-L16F L16M C161RI-L16F L16M C164CI Step AA,BA, Inverter Type_R Type_R Type_R Type_R Type_R Type_R Type_R Type_R Type_R Type_LP1 Type_LP2 Type_LP2 List LP1/2 LP1/2 LP1/2
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.2 C166 Family: Type_R Oscillator-Inverter
table below shows derivatives which compatible recommendation List R_1.
Table C166 Family Derivatives including Type_R Oscillator-Inverter compatible List Device SAx-C163-16F25F Step Oscillator Frequency (40)
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.2.1 C166 Family: Type_R Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_R oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_R Oscillator-Inverter Type_R Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA2.00MG040 CST2.00MG040 CSA4.00MG040 CST4.00MGW040 CSA8.00MTZ040 CST8.00MTW040 CSA12.0MTZ CST12.0MTW CSA16.00MXZ040 CST16.00MXW040 CSA20.00MXZ040 CST20.00MXW0H4 CSA24.00MXZ040 CSA32.00MXZ040 CSA40.00MXZ040 CST40.00MXW040 CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC040 CSTCC4.00MG0H6 CSACV8.00MTJ040 CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] (100) (100) (100) (30) (30) (22) (30) (47) (47) (22) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.3 C166 Family: Type_R Oscillator-Inverter
table below shows derivatives which compatible recommendation List R_2.
Table C166 Family Derivatives including Type_R Oscillator-Inverter compatible List Device SAx-C165-LF SAx-C165-LM Step Oscillator Frequency (40) (40)
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.3.1 C166 Family: Type_R Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_R oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_R Oscillator-Inverter Type_R Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA2.00MG040 CST2.00MG040 CSA4.00MG040 CST4.00MGW040 CSA8.00MTZ040 CST8.00MTW040 CSA12.0MTZ040 CST12.0MTW040 CSA16.00MXZ040 CST16.00MXW040 CSA20.00MXZ040 CST20.00MXW0H4 CSA24.00MXZ040 CSA32.00MXZ040 CSA40.00MXZ040 CST40.00MXW040 CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC040 CSTCC4.00MG0H6 CSACV8.00MTJ040 CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] (100) (100) (100) (100) (30) (22) (30) (47) (47) (22) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open 1.5k Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.4 C166 Family: Type_R Oscillator-Inverter
table below shows derivatives which compatible recommendation List R_3.
Table C166 Family Derivatives including Type_R Oscillator-Inverter compatible List Device SAx-C167-LM SAx-C167S-4RM SAx-C167SR-LM SAx-C167CR-LM SAx-C167CR-4RM SAx-C167CR-16RM Step AA,BA, Oscillator Frequency (40) (40) (40) (40) (40) (40)
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.4.1 C166 Family: Type_R Oscillator-Inverter, List
table below contains recommendation List external circuitry using Type_R oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List external circuitry used with Type_R Oscillator-Inverter Type_R Oscillator-Inverter: Recommendation List Frequency Ceramic Resonator Type CSA2.00MG040 CST2.00MG040 CSA4.00MG040 CST4.00MGW040 CSA8.00MTZ040 CST8.00MTW040 CSA12.0MTZ040 CST12.0MTW040 CSA16.00MXZ040 CST16.00MXW040 CSA20.00MXZ040 CST20.00MXW0H4 CSA24.00MXZ040 CSA32.00MXZ040 CSA40.00MXZ040 CST40.00MXW040 CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC040 CSTCC4.00MG0H6 CSACV8.00MTJ040 CSTCC8.00MG0H6 CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] (100) (100) (100) (100) (30) (22) (30) (47) (47) (22) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.5 C166 Family: Type_LP1 Type_LP2 Oscillator-Inverter
table below shows derivatives which compatible recommendation List LP1/2.
Table C166 Family Derivatives including Type_LP1 Type_LP2 Oscillator-Inverter compatible List LP1/2 Device C161RI-L16F L16M C161RI-L16F L16M C164CI Step Oscillator Frequency
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
13.5.1 C166 Family: Type_LP1 Type_LP2 Oscillator-Inverter, List LP1/2
table below contains recommendation List LP1/2 external circuitry using Type_LP1 Type_LP2 oscillator-inverter referred different frequencies different ceramic resonator types. ceramic resonator types with values parentheses terminal types (with built load capacitors). Table Recommendation List LP1/2 external circuitry used with Type_LP1 Type_LP2 Oscillator-Inverter Type_LP1 Type_LP2 Oscillator-Inverter: Recommendation List LP1/2 Frequency Ceramic Resonator Type CSA2.00MG040 CST2.00MG040 CSA4.00MG CST4.00MGW CSA8.00MTZ CST8.00MTW CSA12.0MTZ CST12.0MTW CSAC2.00MGC040 CSTC2.00MG CSAC4.00MGC CSTCC4.00MG CSACV8.00MTJ CSTCC8.00MG CSACV12.0MTJ CSTCV12.0MTJ0C4 [pF] (100) (30) (30) (30) (30) (15) (15) (22) Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Open Package
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
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Ceramic Resonator Oscillators C500 C166 Microcontroller Family
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