FS9721 Data Sheet FS9721-LP1 4000 Counts Digital Multimeter

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FS9721 Data Sheet FS9721-LP1 4000 Counts Digital Multimeter

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FS9721 Data Sheet
FS9721-LP1 4000 Counts Digital Multimeter
DISPLAY
LIGHT
RANGE
DATA HOLD
Hz/Duty
PUSH BUTTON
SELECT
Temp
ROTARY SWITCHES JUMPER
mA/uA
/Cap V/Hz TERMINALS
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FS9721 Data Sheet
CONTENT
Page Description Features Measureable Modes Application Block Diagram Diagram Description Dice Layout Coordinate Technical Specification Measurement Mode Selection Keys Definition Other Functions Display Application Description Package Outline Demo Board
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Description
FS9721 Data Sheet
FS9721-LP1 high performance, power consumption, 33/4 digits (4000 Counts) Analog/Digital Converter (ADC+MCU) that embedded microprocessor. contains microprocessor, noise high stability operation amplifier, conmutation operation amplifier, voltage promotion voltage regulated power source, high stability bandgap, auto measurement switch function control circuit, buzzer driver circuit, clock oscillator circuit, Backlight display control circuit, display driver circuit FS9721-LP1 embedded microprocessor that control logic function during passing I/O. Measurement functions combined differently using MEA1MEA4 pins code; through setting code build fully auto manual measurement meter. There Range, Select, Hold, Rel, BLCTR, Hz/Duty Reset keys that fulfil measurement selection, functions switch, data hold, Backlight display, relative value, frequency duty cycle measurement, reset functions through these keys. FS9721-LP1 also auto power-off function. there action minutes switch keys meter, system will enter sleeping mode save power. FS9721-LP1 embedded display driver circuit that designed driving LCD. FS9721-LP1 manufacted large intergrated circuit technology that rised hugely reliability product made design easy volume small; system takes power source consumption battery supply that especially palm mode meter. FS9721-LP1 multi-measurement AC/DC converter that embedded microprocessor. Only less addition external components, constitute high accuracy, mult-function cost meter.
Features
2.10 2.11 2.12
Maximum Display: 4000 digits). Converter Rate: times/sec. Measurement Mode: Fully Auto/Manual. Negative Instruction: Auto. Power Voltage Range: 2.4V3.6V. Chip Power Consumption: 6mW. Battery Warning: About Buzzer Driver Circuit (Frequency about 2.7kHz). Embedded OPAMP DC/AC switch. Function Keys: Range, Hold, Rel, Select, BLCTR, Hz/Duty, Reset. Unit Symbol Backlight Display. Auto Power-off.
Measurable Modes
Voltage: Voltage: 400.0A 4000A,40.00mA 400.0mA,10.00A. 400.0A 4000A,40.00mA 400.0mA,10.00A. Resistance: Capacitance: Frequency: Duty Cycle: 0.1%99.9%.
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3.10 3.11 3.12
FS9721 Data Sheet
Diode: 0V1.0 Short Circuit Testing: Sound when lower than Triode hFE: 04000. Temperature Measurement:
Application
Auto/Manual Measurement Palm Mode Digital Multi-Function Meter. Auto/Manual Measurement Card Digital Multi-Function Meter. Auto Measurement Digital Multi-Function Meter. Auto Measurement Clinch Meter (Hook Meter, Clamp Meter, etc.) Number Panel Meter.
Block Diagram
AC-to-DC Converter Function,Range Routers,Opamps, Comparators Source Microprocessor Voltage Double Voltage Regulator Battery Detector Bandgap Reference Rotary Switch Push Button Driver Display
Input
Signal Conditioning Network External Regulation Network
Oscillator Clock Generator
BATTERY CRYSTAL
Diagram
Block Diagram
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Diagram
FS9721 Data Sheet
VDDA
SEG10
SEG11
SEG12
SEG13
SEG14
XOUT
COM1
RLCD
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
COM2 COM3 COM4 ENTX BEEPER BLOUT REFI REFO TSTC OP1N OP1O OP2P
AGND TSTA LCDC2 LCDC1 MEA1 MEA2 MEA3 MEA4 HZ/DUTY HOLD RANGE SELECT
FS9721_LP1
ADPC1
BLCTR
SGND
RCAP
ADIP
OP2N
OP2O
ONEK
TENK
ADIN
CRES1
HUNK
TENM
CRES2
ONEM
Diagram
Package
Description
Package SYMBOL OP2N OP2O ADIP ADIN SGND CRES1 RCAP Description Negative Input DC/AC Converter Operation Amplifier Empty Output DC/AC Converter Operation Amplifier Positive Input Measurement Empty Negative Input Measurement Empty Input Current Measurement Negative Input Analog Ground Connection Extra Positive Input Voltage Division Resistance Connect Point Diode Measurement Empty High Resistance Voltage Input/ Positive Input Resistance Measurement/ Voltage Division Resistance Connect Point Diode Measurement Wave Filter Capacitance Connect Point Measuring Point Resistance Measurement Reference Voltage Negative Input Resistance Measurement Empty Calibrating Resistance Connect Point Capacitance Measurement
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ADPC2
ONEK TENK HUNK ONEM TENM CRES2
FS9721 Data Sheet
Resistance 1.001k Connect Point Voltage Resistance Measurement Empty Resistance 10.010k Connect Point Voltage Resistance Measurement Empty Resistance 101.010k Connect Point Voltage Resistance Measurement Empty Resistance 1.111M Connect Point Voltage Resistance Measurement Empty Resistance 10.000M Connect Point Voltage Resistance Measurement Regulating Capacitance Connect Point Voltage Resistance Measurement Backlight Output Control Used Used Measurement Function Selection Auto/Manual Measurement Selection Relative Value Measurement Display Hold Frequency/Duty Cycle Measurement Selection Fully Manual Measurement Function Selection Measurement Function Selection Measurement Function Selection Measurement Function Selection Measurement Function Selection Auto Measurement Used; Manual Measurement, Note Page Used Test Terminal Negative Input Power Empty Ground Connect Point Analog Signal Empty Positive Input Power Empty Empty Empty Bias Current Input Empty Negative Connect Point Charge Pump Capacitance Positive Connect Point Charge Pump Capacitance Output Charge Pump Circuit Empty
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BLCTR ADPC1 ADPC2 SELECT RANGE HOLD HZ/DUTY MEA4 MEA3 MEA2 MEA1 LCDC1 LCDC2 TSTA AGND
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VDDA
FS9721 Data Sheet
Output Regulated Voltage Power/ Power Source Analog Circuit Connect Point Adjust Resistance Driver Voltage Empty Oscillator Connect Point Oscillator Connect Point Empty (See Note Page Empty Segment Segment Segment Segment Segment Segment Segment Segment Segment Segment Segment Segment Segment Segment Backplane Display Backplane Display Backplane Display Backplane Display Used Beeper Driver Output Backlight Driver Output Reset Input Empty Reference Voltage Input Bandgap Reference Voltage Output Positive Output Wave Pre-filter Empty Positive Input Wave Pre-filter Negative Point Wave Pre-filter Test Negative Input Buffer Operation Amplifier Empty Output Buffer Operation Amplifier Empty Positive Input AC/DC Converter Operation Amplifier
RLCD XOUT SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM1 COM2 COM3 COM4 ENTX BEEPER BLOUT REFI REFO TSTC OP1N OP1O OP2P
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FS9721 Data Sheet
Dice Layout Coordinate
Substrate should connected opening:90µm Chip size: Diagram Name OP2N OP2O ADIP ADIN SGND CRES1 RCAP ONEK TENK X[mm] 0.264 0.404 0.544 0.669 0.794 0.919 1.044 1.169 1.294 1.419 1.544 1.669 1.794 1.919 2.044 Y[mm] 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 78PIN Dice PadNo.
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Name VDDA RLCD XOUT SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8
X[mm] 2.974 2.834 2.694 2.569 2.444 2.319 2.194 2.069 1.923 1.798 1.673 1.548 1.423 1.298 1.173
TD0204-0202
Y[mm] 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.495
VER.
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HUNK ONEM TENM CRES2 BLCTR ADPC1 ADPC2 SELECT RANGE HOLD Hz/DUTY MEA4 MEA3 MEA2 MEA1 LCDC1 LCDC2 TSTA AGND
FS9721 Data Sheet
2.169 2.294 2.419 2.544 2.669 2.809 2.949 3.147 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.157 3.148 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.396 0.536 0.661 0.786 0.911 1.036 1.161 1.286 1.411 1.536 1.661 1.786 1.911 2.036 2.176 2.495 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM1 COM2 COM3 COM4 ENTX BEEPER BLOUT REFI REFO TSTC OP1N OP1O OP2P 1.048 0.923 0.798 0.673 0.548 0.408 0.268 0.091 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.077 0.083 2.495z 2.495 2.495 2.495 2.495 2.495 2.495 2.495 2.176 2.036 1.911 1.786 1.661 1.536 1.411 1.286 1.161 1.036 0.911 0.786 0.661 0.536 0.396 0.077
Technical Specification (VDD=3V, Ta=25)
Symbol AGND VDDA VBAND REFI VBATT FLCD Parameter Recommend Operation Power Voltage Supply Current Power Supply Current Digital Input High Voltage Digital Input Voltage Pull Current Analog Ground Voltage Analog Power Build Reference Voltage Build Reference Voltage Output Voltage Coefficient Recommend Reference input Voltage Battery Detector Voltage Frame Frequency Test Condition Mode Power VDD-0.5 Vin=0
VDD/2
Units ppm/V
VDD/2
VDD/2
Relative AGND VDD=2.4~3.6 Relative AGND
-2000
1.25 0.44
+2000
2.25
2.55
VER.
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VLCD FBEEP FRS232 IRSOU
FS9721 Data Sheet
VOH=2V ADPxl Input=0V ADPxl Input,Full Scal 240.0mV ADPxl Input240mVrms 20Hz~1kHz -0.001 0.000 0.001 Counts 2400 bitHz
Pk-Pk Driver Voltage Beeper Frequency RS232 Baud Rate RS232 Output High Current Zero Input Reading Linearity (Max. Deviation From Best Straight Line Measurement Bandwidth Error
Continuity Check Value Measurement 4050 Counts Display Count Autorange Counts 4000 Counts Autorange Down Counts Counts VFREA Frequency Counter Input Level VIL(Relative (Hz/Duty Control) AGND) VIH(Relative AGND) FMAX Frequency Counter Input Vpp= 100mV 500k frequency (Hz/Duty Control) Square Wave Input Duty Measurement Pulse Vpp= 100mV Width Error (Hz/Duty Control) Square Wave Input VFRED Frequency Counter Input Level VIL(Relative -600 (MEAS=0101) AGND) VIH(Relative AGND) FMAX Frequency Counter Input Level Vpp= 600mV (MEAS=0101) Square Wave Input Duty Measurement Pulse Vpp= 600mV Width Error(MEAS=0101) Square Wave Input Capacitor Measurement 4.000nF Mode 5%+25 Counts Accuracy after Zero Input Relative Adjust 400.0nF Mode 40.00 Mode 2%+10 Counts 400.0 Mode 0.5%+3 Counts 1%+2 Counts 4.000 Mode 1.5%+2 Counts 40.00 Mode duty cycle measurement, have input square waves. main error measurement error pulse width that comparator resolve. Suppose error 100ns input frequency 100KHz. divide square wave into 1000 segments (1000 counts), thus each count takes Therefore maximum error Duty Cycle measurement (100ns/10ns)=10 Counts. duty cycle signal measured 50.0%±1.0%. signal measured duty cycle more than less than measurement will display 0.00%.
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FS9721 Data Sheet
Measurement Mode Selection
10.1 Auto Measurement Mode Selection (MEA1MEA4 empty, connect VSS;):
Measurement Function Select Function Switch Hz/Duty Range Hold Select Jump
Hz/Duty DCA/AcA Switch ACV/DCV
Switch
V/Hz/ Duty Switch V/Hz/Duty Switch Hz/Duty Switch A/Hz/Duty Switch V/Hz/Duty Switch A/Hz/Duty Switch mA/Hz/Duty Switch
J7J9 J3J11 J3J10 J4J6 J4J6
ACA/DCA
Switch
DCmA/ACmA
Switch
Diode continuity Switch Ohm/Diode/Cap/ ContinuitySwitch Diode Continuity hFE, Temp. Note: Jump column means measurement function open circuit diagram that common used diagram Auto mode, Measurement mode selected only when Range pressed. input from ADP. full measurement 400mV, decimal. auto measurement mode, CAP, LCDC1 LCDC2 empty.
J4J6 J4J6 J4J6 J4J6 J1J2,
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FS9721 Data Sheet
MEA1 Function Jumper Select Rel. Hz/Duty Hold
10.2 Manual Measurement Mode Selection (MEA1MEA4, empty, connect VSS)
MEA4 MEA3 MEA2
400.0mV 4.000V 40.00V 400.0V 1000V Beeper 400.0 4.000k 40.00k 400.0k 4.000M 40.00M Diode 4.000nF 40.00nF 400.0nF 4.000F 40.00F 200.0F 10.00A 400.0mA 40.00mA 4000A 400.0A Duty
J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J4,J6 J3,J10 J3,J10 J3,J11 J3,J11 J7,J9 J7,J9 J1,J2
DC/AC DC/AC DC/AC DC/AC DC/AC
DC/AC DC/AC DC/AC DC/AC DC/AC
Notes: following numbers dice package numbers. form means connected common diagram. LCDC1 (pin33) connects VSS. CTR: (pin47). Power Power Provide power control external active components. 400.0mV input singly from ADP(pin7) that makes specification better. input 400.0mV from ADP(pin7) AGND. Temp. input 40V/ from TSTC(pin75) AGND. difference between manual measurement auto measurement: CAP(pin28) MEA4MEA1 used together select. LCDC1(pin33) connects VSS. single mode input from ADP. control pins: HOLD: pin26; Rel: pin25; Select: pin23; Back Light: pin20; Back light Output: pin68.
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Keys Definition
FS9721 Data Sheet
11.1 Range (Auto/Manual Measurement Switch) Range switch Auto/Manual Measurement acts activation. default Auto Measurement when power press time, system will switch Manual Measurement. Manual Measurement mode, system will jump range when pressed time. continue press range, system will jump lowest range, recircle orderly. press hold over seconds, system will switch Auto Measurement mode. Hz/Duty Cycle cannot measured Manual Measurement. 11.2 Hold (Display Hold) Hold control Display Hold acts activation. functions are: hold display data. When pressed, display data will locked keep unchanged; press again, system will unlocked enter normal measurement mode. 11.3 (Relative Value Measurement) measure Relative Value acts activation. controls measure Relative Value except Hz/Duty, Diode Continuity functions. 11.4 BLCTR(Backlight Control) BLCTR control Backlight acts activation. When press hold over seconds will enable Backlight; press again, Backlight will disable. 11.5 Select (Function Switch) Select select functions acts activation. select function measure. 11.6 Hz/Duty(Frequency/Duty Cycle) Hz/Duty select Frequency/Duty Cycle acts activation. Frequency Measurement Mode, press select Duty Measurement; AC/DC Mode, press select Voltage /Hz/Duty Current/Hz/Duty Measurement Mode. 11.7 Reset (Reset Key) Reset reset system acts activation. Press reset microprocessor.
Other Functions
12.1 Auto Power-off process measurement, action operated minutes function keys function switch, meter will Auto (Standby Mode). Auto Power-Off status, function keys pressed function switch activated, meter will Auto (Working Mode). press hold Select power Auto Power-On function will disabled. 12.2 Buzzer When press turn function switch, buzzer will raise sound (approx. 0.25 second second). When measuring Voltage>750V, Voltage>1000V, AC/DC Current>4000A, AC/DC Current >400.0mA, AC/DC Large Current >10A, buzzer will keep sounding overload warning. Approximate minute before system auto power off, buzzer will raise constantly sounds warning. Before system power off, buzzer will raise long sound warning. 12.3 Backlight system Backlight driver output function control Backlight circuit open close provide convenience reading value when light poor vision. When press BLCTR over seconds, Backlight will open; when press again, Backlight will close. After Backlight open, pressed, will extinguish after seconds.
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Display
FS9721 Data Sheet
Notes: Working Voltage: Drive Method: Duty, Bias. Diagram Display Structure
Diagram
Display Drive Wave
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FS9721 Data Sheet
Application Description
14.1 Common Circuit Diagram A100 Package
BUZZER XTAL 100k RESET 10uF 200k 10uF 10uF 100k 0.1uF 10uF 10uF BATTERY
10nF
VR10k
500k
28.5k VR10k VR2k Temp
27nF
OP2N OP2O AD1P AD1N SGND CRES1 RCAP ONEK TENK HUNK ONEM TENM CRES2 BLCTR ADPC1 ADPC2
BLOUT ADP2
COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 XOUT RLCD VDDA
COM2 COM3 COM4 ENTX BEEPER BLOUT REFI REFO TSTC OP1N OP1O OP2P
FS9721_LP1
AGND TSTA LCDC2 LCDC1 MEA1 MEA2 MEA3 MEA4 HZ/DUTY HOLD RANGE SELECT
MEA1 MEA2 MEA3 MEA4 RANGE HZ/DUTY HOLD
4.7uF
0.47uF
57.4k 100k 900k 100k 0.47uF 101.01k 1.111M Temp
27nF
47nF Input 400.0mV 10uF 100k
1N914
1N914
100k
DCmV Diode
DCV/ACV
Ohm/Cap/Diode
27nF
100k
27nF 0.01 9.99
uA/mA
V/Ohm/Diode/Cap
VDDA AGND
Battery Negative Terminal Negative Power Input Battery Positive Terminal Positive Power Input Charge Pump voltage about 2*VDD Analog Power about 3.9V Analog Common about VDD/2
Diagram
Common Circuit Diagram
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Dice
FS9721 Data Sheet
BUZZER
XTAL
10uF 10uF 200k 10uF 100k BATTERY 0.1uF 10uF 10uF
100k RESET
10nF
VR10k
500k
27nF VR10k Temp
OP2N OP2O ADIP ADIN SGND CRES1 RCAP ONEK TENK HUNK ONEM TENM CRES2 BLCTR ADPC1 ADPC2
BLOUT ADP2
SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 XOUT RLCD VDDA
COM1 COM2 COM3 COM4 ENTX BEEPER BLOUT REFI REFO TSTC OP1N OP1O OP2P
FS9721_LP1
AGND TSTA LCDC2 LCDC1 MEA1 MEA2 MEA3 MEA4 HZ/DUTY HOLD RANGE SELECT
MEA1 MEA2 MEA3 MEA4 HZ/DUTY HOLD RANGE
28.5k
VR2k
4.7uF
27nF
0.47uF 0.47uF Temp 1N914 1N914 100k 900k
47nF 57.4k 101.01k 1.111M 100k Input 400.0mV 100k
100k
DCmV Diode
DCV/ACV
Ohm/Cap/Diode
10uF
27nF
100k
27nF 0.01
9.99
uA/mA
V/Ohm/Diode/Cap
VDDA AGND
Battery Negative Terminal Negative Power Input Battery Positive Terminal Positive Power Input Charge Pump voltage about 2*VDD Analog Power about 3.9V Analog Common about VDD/2
Diagram
Common Circuit Diagram
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FS9721 Data Sheet
Current Mode/10 Measurement (R6+VR1,R13=R14) R20:R19=9:1 Voltage Reference R10,R7,VR2
14.2 FS9721-LP1 Technical Pointer Components Relationship
Network 400mV 400V 1000V 400mV 400V 1000V 400k 400A 4000A 40mA 400mA 400A 4000A 40mA 400mA Diode R26/(R27+R26)=1/10 R25/(R27+R25)=1/100 R24/(R27+R24)=1/1000 R23/(R27+R23)=1/10000 R26/(R27+R26)=1/10, R9:R8=9:1 R26/(R27+R26)=1/10 R25/(R27+R25)=1/100 R24/(R27+R24)=1/1000 R23/(R27+R23)=1/10000 R27//R23=1k R27//R23=1k R27//R24=10k R27//R25=100k R27//R26=1M R27=10M R16+R17+R29=1k R16+R17+R29=1k R29+R16=10 R29+R16=10 R29=0.01 R16+R17+R29=1k R16+R17+R29=1k R29+R16=10 R29+R16=10 R29=0.01
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FS9721 Data Sheet
14.3 FS9721-LP1 (Diagram Diagram Components List
SPEC. 200k 100k 0.1F 100k 28.5k 500k 100k SPEC. 100k 9.99 100k 900k 100k 57.4k 1.001k 10.010k SPEC. 101.010k 1.111M 10.000M 0.01 100k 10nF 4.7F 27nF SPEC. 0.47nF 27nF 0.47nF 27nF 27nF 47nF 1N914 1N914 XTAL Battery SPEC. 4MHz FS9721-LP Buzzer
VDDA
14.4 Power System
2*VDD 3.9V
REFI R1040k 200k REFO RLCD VDDA 10uF 0.1uF 10uF 10uF 10uF 10uF AGND 100k
RLCD REFO 1.5V 1.5V 1.2V 0.4V REFI AGND
FS9721_LP1
Diagram
Relative Voltage Each Point
FS9721_LP1
Diagram
Power Circuit
bias current input point increase will reduce current consumption shortage bias current will affect input range measurement. AGND analog ground connection. value equal middle point battery voltage. point value generated cannot connect middle point battery. bypath capacitance, also make AGND regulated VSS. power pump capacitance. makes voltage pass charge/discharge rise being about double voltage VDD. VDDA output voltage after regulation about 3.9V that relative VSS. REFO bandgap power source about 1.2V that relative AGND 100ppm/ stability.
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FS9721 Data Sheet
14.5 Power Supply Circuit
different applications user make different power supply methods. some measurements, sensor requires higher voltage such OPAMP, Hale components that difficult supply power then take some power supply methods below.
10uF 10uF
AGND
FS9721_LP1
10uF 10uF AGND
DC-TO-DC AGND
Diagram
Power Supply
FS9721_LP1
4.5~9V
10uF
Diagram Power Supply
FS9721_LP1
Diagram
4.5V9V Power Supply
4.5V
10uF
AGND
6V~12V
2V~2.4V AGND
10uF
2V~2.4V
FS9721_LP1
4.5V Power Supply
FS9721_LP1
Diagram
Diagram
6V12V Power Supply
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IN4148 IN4148
FS9721 Data Sheet
14.7 Activated Reset Circuit
10uF 9V~12V 10uF
AGND
100k
FS9721_LP1
RESET 10nF
NJM79L03A
FS9721_LP1
Diagram
9V12V Power Supply
14.6 Basic Power Source
Diagram Reset Circuit
14.8 Crystal Oscillator Circuit
REFI
REFO
XOUT
FS9721_LP1
Diagram
Utility Internal Basic Power Source
FS9721_LP1
Diagram
REFI
Crystal Oscillator Circuit
ICL8069A
FS9721_LP1
diagram, provides statical working point revisor; tiny adjustment frequency; temperature compensation. less requirements situation, unused.
Diagram
Utility External Basic Power Source
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FS9721 Data Sheet
14.10 Mode Switch Function Control Circuit
14.9 Buzzer Driver Circuit
BUZZER
BEEPER FS9721_LP1
Diagram Resistance Beeper Connection
Diagram Mode Switch Function Control Circuit S6S9 mode switches lock. their functions, please refer 10.1 10.2. S2S5 function selection switches activation. their functions, please refer Keys Other actual application, utility switch keys should taken according real situation.
BUZZER
BEEPER FS9721_LP1
Diagram
High Resistance Beeper Connection
14.11 Commutation Circuit
Diagram average commutation circuit diagram FS9711B. circuit, signals enter through R26, then process voltage division through R26, R25, R24, R22. divided signals from OP1O enter through ADIP ADIN after commutation. adjust voltage signals calibration measurement. 240mV mode amplified times through Diagram peak commutation circuit diagram. Diagram true validity commutation circuit diagram, user determine self according need select which commutation circuit.
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FS9721 Data Sheet
100K
100K 27nF
0.47uF 0.47uF VR2K 28.5K 4.7uF
27nF
ADIP
ADIN OP2O
OP2N
OP1O
OP1N
FS9721_LP1
Digit Part
Diagram
Average Commutation Circuit Diagram
100K 27nF 28.5K 4.7uF
ADIP
ADIN
OP2O
OP2N
OP2P
OP1O
OP1N
FS9721_LP1
Digit Part
Diagram
Peak Commutation Circuit
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FS9721 Data Sheet
OP1O
10uF
AD737
Input Ampcifier
Full Wave Rectigier
ADIP
0.1uF
Bias Section
core
100K
ADIN
33uF
FS9721_LP1
Diagram
True Validity Commutation Circuit
14.12 Voltage Measurement
R720k 1.111M 101.01k REFI REFO TENM ONEM HUNK TENK ONEK
Voltage Division Voltage Measurement Diagram below:
Vin=1V
Vin=10V
Vin=100V
Vin=1000V Vout=0.1V
Vout=0.1V 1.111M
Vout=0.1V 101.01k
Vout=0.1V
SGND
FS9721_LP1
Diagram Diagram Voltage Measurement
Voltage Division Circuit Diagram
When doing voltage measurement, measuring voltage input from resistance R27, DCmV divided, enter directly; 40V, 400V, 1000V mode divided R26, R25, R24, gain 1/10, 1/100, 1/1000, 1/10000 voltage, then enter adjust resistance value calibration measurement.
formula voltage division Vout=Vin [Rs/ (R27+Rs R26, R25, Therefore, accuracy R23, R24, R25, determine accuracy measurement. AcmV enter through divided 1/10 voltage, then amplified times internal fulfill measurement, accuracy also determine measuring accuracy ACmV.
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FS9721 Data Sheet
Resistance measurement refers standard resistance, then takes comparison between measuring resistance standard resistance measuring resistance value. standard resistance mode (R27). standard resistance other modes parallel respectively R26, R25, R24, 100k, 10k, resistance. When doing resistance measurement, internal will generate 0.4V voltage (relative AGND), voltage output respectively measuring resistance through resistance R26, R25, R24, R23. connects negative through standard resistance voltage reference. mode switch. When doing resistance measurement, close. wave filter capacitance measuring point resistance measurement.
1413 Current Measurement
uA/mA 0.5A/250V 9.99 10A/250V 0.01 SGND 900k
100k
FS9721_LP1
Diagram
Current Measurement
When doing current measurement, current signals enter through R20. sampling resistance mode (R16+R17+R29), sampling resistance mode (R16+R29) sampling resistance mode R29. They measured respectivly through mode switch. When measuring open, close; when measuring open, close; when measuring large current using mode, close. maximum reduced voltage modes These voltages input voltage comparator compare. voltage smaller than 400mV, current signal sent directly converter; voltage larger than 400mV, system will jump mode divide voltage R19, then send 1/10 converter. accuracy resistor R16, R17, R29, influence accuracy current measurement.
14.15 Diode Test
Diode
900k 100k
TENM
FS9721_LP1 ONEK SGND
Diagram
Diode Measurement
14.14 Resistance Measurement
1.111M 101.01k 100k 900k 27nF
TENM ONEM HUNK TENK ONEK FS9721_LP1 CRES1 SGND
Diode test generate 1.5V voltage from internal output through R23, then positive diode through PTC. positive voltage reduction generated diode about 0.5V-0.7V. divided R19, 1/10 then amplified times internal display value. mode switch. When doing diode measurement, close.
AGND
Diagram Resistance Measurement
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14.16
FS9721 Data Sheet
Capacitance measurement charge/discharge measuring capacitance through form oscillation, then calculate cycle oscillation capacitance value. adjust calibrate value capacitance measurement. mode switches. When doing capacitance measurement, close. actual application, linearity worse when doing measurement, take consideration paralleling proximate 1000pF capacitance input capacitance measurement during design. When doing measurement, press make value zero before measuring. linearity smaller measurement capacitance mode will better.)
Short Circuit Testing
Continuity
TENM
FS9721_LP1
900k
ONEK SGND
AGND
Diagram
Short Circuit Testing
Short circuit testing proceeded resistance mode. 0.4V voltage (relative AGND) generated internal output through R23, then short measuring point through PTC. mode switch close during doing short circuit testing. gets voltage VRx, input through R20. smaller than beeper will sound.
14.18 Frequency Measurement
100k
10uF
FS9721_LP1 SGND
14.17 Capacitance Measurement
DODO+
Diagram
57.4k 900k
RCAP
3/4VDD 1/4VDD DODO+
AGND
Frequency Measurement
SGNDFS9721_LP1
Typical Wave Input
3/4VDD 1/4VDD
Diagram
Capacitance Measurement
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14.19
FS9721 Data Sheet
14.20 Temperature Measurement
REFO
Triode Testing
VDDA
100K
220k 100K 16.5k
SGND TSTC
1.8K
OP1O
FS9721_LP1
type
Diagram
PNP-type Triode
VDDA
Diagram Temperature Measurement
220K
connection thermocouple diagram, negative point connected directly ground (AGND). When thermocouple connected damaged, will display overload (OL).
100K
REFO
16.5K
100K 100K
SGND
Diagram
NPN-type Triode
TSTC
OP1O
1.8K
type
FS9721_LP1
Diagram Temperature Measurement
diagram, connection thermocouple more troublesome, when thermocouple connected damaged, will display indoor temperature.
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Package Outline
FS9721 Data Sheet
Diagram
Package Outline
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Demo Board
FS9721 Data Sheet
port1 DB9M RSO1 DioS RS232 ENABLE DIP-2 BUZZER COM2 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 10uF 200K 10uF 10uF 100k
DioR
0.1uF 10uF
ENTX
SW-SPDT BATTERY 10uF
COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 N.C. N.C. XOUT N.C. RLCD VDDA N.C. N.C. N.C.
10uF
BLOUT 100K 10nF VREF 500K VR10K ADP2 27nF GAIN VR2K TEMP GAIN Temp1 28.5K Temp2 COM3 COM4 COM5 ENTX 0.47uF
OP2N N.C. OP2O ADIP N.C. ADIN N.C. SGND N.C. CRES1 N.C. RCAP ONEK N.C. TENK N.C. HUNK N.C. ONEM N.C. TENM CRES2 TSTB ADPC1 ADPC2
COM2 COM3 COM4 ENTX BEEPER BLOUT N.C. REFI REFO N.C. TSTC OPIN N.C. OP1O N.C. OP2P
FS9721_LP1
N.C. N.C. N.C. AGND N.C. TSTA LCDC2 LCDC1 MEA1 MEA2 MEA3 MEA4 HOLD HZ/DUTY RANGE SELECT
TSTB1 DIP-8 SW-PB SW-PB SW-PB SW-PB SW-PB DIP-2 HZ/DUTY HOLD RANGE SELECT
FS9711G/I 27nF
BLCTR
0.47uF
1N914
1N914
47nF SELECT
GAIN VR30K
101.0K
JMP1 100K
1.111M
100K
TSTB SW-PB
100K
100K 27nF ADP2 ADP/ADP1 Input Input ADP2 Input COM1
27nF
900K
DCV/ACV
10uF
OHM/CAP/DIODE DCmV/OHM/CAP/Diode
Title ADP2 V/OHM/Diode/CAP Size Letter Date: File: 25-Feb-2002 Sheet Drawn Number
FS9721 DESIGN
Revision
Diagram Demo Board Schematic
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FS9721 Data Sheet
FS9711_LPX Demo Board Location:
RS232 PORT
FS9711_LP3 FS9711_LP1 FS9711B/Q100 MODULE
DIP-2
Power RS232 ON/OFF (LP3 Q100 Use)
Temp1 Temp2 Temp Gain
FS9721_LP1 FS9721_LP3 FS9721B/Q100
TSTB LCDC2 LCDC1 MEA1 MEA2 MEA3 MEA4
Hz/duty Hold Range Select BL_CTR
Vref
Gain
ADPC1
ADPC2
Gain
Input Input ADP2 Input JMP1
DIP-2
Diagram Schematic
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V/Diode/OHM/CAP
DCmV/OHM/CAP/Diode DCV/ACV DCmV/OHM/CAP/Diode
ADP/ADP1
ADP2
COM1
TD0204-0202
DIP-8
VER.
FS9721 Data Sheet
Input Voltage, Resistance, Diode Capacitance. Analog Signal Ground. Input Voltage (mV), Duty Cycle. Unused. (Note: only FS9721_LP3 FS9721B/Q100.) J1~J10: Please refer FS9721_LP1 Measurement Mode Jumper S1~S6: Please refer FS9721_LP1 Demo Board SW-DIP8: Please refer FS9721_LP1 Measurement switch Level)
FS9721_LP1 Measurement Mode:
MEA4 MEA3 MEA2 MEA1 Function Mode ADPC2=0 ADPC2=1 Beep Diode Beep Diode Diode Beep AC/DC DC/AC AC/DC DC/AC Ohm/Diode/ Diode/Beep/ Ohm/Diode/ Beep/CAP CAP/Ohm Beep/CAP AC/DC DC/AC AC/DC DC/AC Diode Beep Temp2 input 400.0mV from ADP(pin7) AGND. Temp. input 40V/ from TSTC(pin75) AGND. ADPC1=1, max. input current mode 40mV~400mV. ADPC1=0, max. input current mode 400mV~4V. Select(1->0->1) duty duty duty duty Beep Diode DC/AC DC/AC Ohm/Diode/ Beep/CAP DC/AC DC/AC
duty duty duty Hz/duty Hz/duty
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FS9721 Data Sheet
FS9721_LP1 Measurement Mode Jumper Setup:
MEA4 MEA3 MEA2 MEA1 Function Mode Beep Diode Ohm/Diode/Beep/CAP Diode Beep Temp2 Jump J1,J3 J1,J3 J1,J3 J3,J8 J1,J3 J3,J8 J3,J8 J1,J3 J1,J3 J7,J9,J10 Input V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM ADP1,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM V/Diode/Ohm/CAP,COM ADP1,COM ADP1,COM
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FS9721 Data Sheet FS9721-LP1 4000 Counts Digital Multimeter

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