AN1748 Freescale Semiconductor, Inc. Building Universal Seri
|
|
|
Top Searches for this datasheet
Order this document AN1748/D
AN1748
Freescale Semiconductor, Inc.
Building Universal Serial Keyboard Using Motorola MC68HC(9)08KH12
Patrick Keating Product Engineer, Consumer Systems Group, Home Electronics Austin, Texas
Introduction
universal serial (USB) changing which computer users plug activate computer peripheral devices. "plug-nplay" "hot swap" abilities this peripheral architecture allow users plug peripherals such keyboards immediately have them available without rebooting longer users have suffer through detangling wires back configuring switches, even bothering with loading software drivers. evolution computer serial bus. This architecture will allow peripherals plugged into personal computer using only ports back This accomplished through daisy chaining devices using "hubs," which allow users link peripherals back host through other devices which have extra downstream connections.
Motorola, Inc., 1998
AN1748
More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
serial standard, developed computer industry leaders, made necessary increasing demands greater performance. classes human interface device (HID). HIDs include devices such mice, gamepads, keyboards. Computers today have incredible computing power which lends themselves telephony, audio/visual applications, wide range HIDs. diversity these potential HIDs also requires allow small, periodic transfer operations low-speed devices such mice keyboards isochronous operation high-speed applications such telephony audio. Because these different types devices require varying speed performance bandwidth, capabilities high-speed devices that operate megabits second (MBPS) low-speed devices that operate MBPS. Additional hardware improvements that make more desired installing peripherals include: Unique connector design. Unlike previous connector scenarios which every peripheral connector design with varying number pins, uses standard types connector: upstream connector. Figure description upstream connector. downstream receptacle cable between connectors have configurations, depending upon speed peripheral connecting: high-speed devices, there power wire, ground wire, shielded signal wires that carry data. low-speed devices, configuration same except signal wires shielded because they less sensitive line noise.
Freescale Semiconductor, Inc.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note Introduction
DIFFERENTIAL SIGNAL PAIR
POWER PAIR
Figure Connector with Identification
Freescale Semiconductor, Inc.
connector plugs into ports located backplane seen Figure
SCSI INTERFACE
GRAPHICS PORT
INTERFACE
Figure Backplane Showing Connections
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
This application note: Reviews design legacy type keyboard discusses important features scan algorithm overview MC68HC(9)08KH12 well discussion module operation Describes high-speed, MBPS, upstream port connection four high-speed MBPS) low-speed (1.5 MBPS) downstream port connections Explores integrated 3.3-volt voltage regulator In-depth instruction programming Kbytes FLASH memory Outlines steps needed construct keyboard with universal serial functionality using Motorola 8-bit MC68HC(9)08KH12 microcontroller
Freescale Semiconductor, Inc.
NOTE:
This application note assumes that reader familiar with Motorola HC08 Family 8-bit microcontrollers universal serial bus.
PS/2 Keyboard Design
concept PS/2 keyboard design founded combination grid-like hardware setup software that scans grid, decoding interrupt specific keys that have been depressed. Keyboards typically have from keys. keys laid rows columns, forming grid which easily decoded then software determine keystroke. number columns typically eight, while count between "brains" keyboard found 8-bit microcontroller that takes input from keyboard, decodes then sends information host computer. This arrangement frees microprocessor from constantly polling keyboard, relying
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note PS/2 Keyboard Design
instead upon interrupts keyboard microcontroller transfer information when inputted. columns grid wired microcontroller port pins that have internal pullup device well ability request interrupt. interrupt request active low, applying will pull ground, causing interrupt request occur. Figure physical description column pins tied together. Figure example keyboard scan grid.
Freescale Semiconductor, Inc.
Figure Representation Resulting Column Contact/Open operation first determining keys has/have been depressed then decoding information send host computer eight column port pins pulled high through internal pullup resistor. keyboard interrupt also enabled eight column port pins. microcontroller software pulls down port pins ground while pulling remaining port pins VDD. example, port consists port through port port consists port through port port consists port through port then port will pulled remaining port pins will pulled high. keys) is/are depressed row(s) that correspond(s) port that pulled low, then associated column also will pulled low, because column tied together
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
electrically depressed Figure This will cause keyboard interrupt that column port pin. port pins pulled low, that indicates that depressed software will continue scan. port pulled and, therefore, requests interrupt, software jumps subroutine that decodes combination column pins sending value corresponding grid location host computer. Then computer will output character monitor.
Freescale Semiconductor, Inc.
microcontroller software then pulls next low, port pulls rest pins high. sequence continues until rows pulled through port process alternately pulling pins takes approximately Once port pulled low, process starts over port repeating sequence.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note PS/2 Keyboard Design
PORT
PORT
6--> Note
Freescale Semiconductor, Inc.
PORT PORT
Note
Note
Notes: Microsoft® right Windows® logo Microsoft left Windows logo Microsoft Notepad logo
Figure Keyboard Scan Grid
Microsoft, Microsoft logo, Windows logo registered trademarks Microsoft Corporation.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note Description MC68HC(9)08KH12
MC68HC(9)08KH12 member low-cost, high-performance 68HC08 Family 8-bit microcontrollers. This device fully compliant composite microcontroller available 64-pin quad flat pack (QFP) plastic package. Additional features MC68HC(9)08KH12 include:
Freescale Semiconductor, Inc.
Five on-chip transceivers On-chip 3.3-volt regulator transceivers 12-MHz upstream port 12-MHz/1.5-MHz downstream ports control endpoint with: 8-byte transmit buffer 8-byte receive buffer interrupt endpoint: 1-byte transmit buffer device control endpoint: 8-byte transmit buffer 8-byte receive buffer Device interrupt endpoints: 8-byte transmit buffer bytes Kbytes FLASH memory with security general-purpose input/output (I/O) ports, them with software configurable pullups 16-bit, 2-channel timer interface module 20-bit keyboard interrupt port Five (light emitting diode) direct drive port pins (computer operating properly) reset counter
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note Universal Serial Module
Universal Serial Module
MC68HC(9)08KH12 designed function compound device. embedded, full-speed device combined with single module. capable performing these five basic properties controlled hardware software:
Freescale Semiconductor, Inc.
Connectivity behavior Power management Device connect/disconnect detection fault detection recovery Full/low-speed device support
embedded device submodule, three types data transfer supported: Control Interrupt Bulk, transmit only
module designed invisible user. Simply plug peripheral immediately active available, living "plug-n-play" promise. MC68HC(9)08KH12 differs from other Motorola microcontrollers that functionality. keyboard constructed with MC68HC(9)08KH12 capable having four high/low-speed peripherals plugged into microcontroller performs functions controller well repeater, providing path next device upstream then eventually host through root port. More generally, must support functionality requirements.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
Connectivity behavior varies, depending whether propagating traffic resuming signaling simply going into idle state. Power management involves stopping resuming power supply device, depending user requirements. These transitions conserve power consumption, making device operation more efficient. recognition device connect disconnect important function controller. connect detection occurs when low- highspeed device transitions DMINUS DPLUS line, respectively, high. Both DPLUS DMINUS pins, when disconnected state, pulled ground through 15-k pulldown resistors. This signals host that there device attached that node. discern whether high- low-speed device been attached node, controller determines which signal line, DPLUS DMINUS, pulled 3.3-volt operating voltage. DPLUS pulled high-speed device; DMINUS being pulled volts indicates that low-speed device been attached. Because hubs main link connectivity, essential that they have ability sense possible errors prevent them from occurring, preserving functionality connected network devices. last aspect functionality, full/low speed device support, allows open connectivity numerous devices available user, both full speed. This feature gives maximum flexibility usability. module contains on-chip voltage regulator which essential providing 3.3-volt signal transceiver pins. on-board voltage regulator transitions 5-volt signal required 3.3-volt transceiver voltage, eliminating need external voltage regulator. on-chip design eliminates sensitivity noise that existent device virtually guarantees that transceiver signals will always compliant 0.3-volt specification.
Freescale Semiconductor, Inc.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note Universal Serial Module
Other microcontrollers market today have on-chip regulator. Instead, they rely upon divide down resistor external voltage regulator. divide down resistor approach flawed opens device manufacturer noise sensitivity issues real possibility violating specification volts being supplied transceiver.
Freescale Semiconductor, Inc.
CABLE
Figure Voltage Divide Down Resistor Circuit Example example divide down resistor configuration fail, yielding operating range 2.83 3.79 volts, even though resistors with ranges accuracy used, this: Using equation deriving resulting voltage using divide down resistors: +R2))
NOTE:
being supplied microcontroller assumed range volts
Exceeding specification high side assuming accurate resistors: (15750 (15750 7125 volts 3.79 volts
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
Exceeding specification side, again assuming accurate resistors: (14250 (14250 7875 volts 2.83 volts Both these possible outcomes voltage divide down resistors results violation specification. Using high precision resistors lower chance exceeding specification, additional cost, which significant percentage microcontroller cost, does make this reliable cost-effective solution. Utilizing external voltage regulator also adds large cost application, since large percentage semiconductor selling price. integrated voltage regulator MC68HC(9)08KH12 yields most robust performance, matched only highly competitive cost.
Freescale Semiconductor, Inc.
Port Pins
MC68HC(9)08KH12 port design allows user wide variety possible configurations. Table lists some possible configurations using port pins. Table Listing MC68HC(9)08KH12 Port Features
Software External Configurable Interrupt Pullups Port Port Port Port Port Port pins) pins) Direct Drive Optical Number Interface Pins Port Comments General-purpose I/O) drive, Keyboard interrupt, Interface optical mouse, keyboard interrupt, Keyboard interrupt,
Note: Port general-purpose only.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note FLASH Memory
Freescale Semiconductor, Inc.
ports function bidirectional, general-purpose pins. Ports have software configurable pullups. Port capability drive LEDs with 3-mA source 10-mA current sink capability. Ports configurable external interrupt pins. Port pins E0-E3 have capability being configured support optical interface which useful optical mouse application. mentioned previously, typical keyboard uses eight port pins columns port pins rows generate keyboard grid. This configuration leaves port pins available applications decided user. versatility port configuration allows user wide range options which available port pins added peripheral functionality.
FLASH Memory
Unlike other chips available marketplace, MC68HC(9)08KH12 embedded FLASH memory array. Kbytes FLASH memory allow lower cost application development well easy in-circuit reprogramming correct bugs update code that exist application. FLASH memory read, programmed, erased using single external supply on-board charge pump. FLASH memory also Motorola security feature which discourages others from accessing application code unless authorized code developers. Additional features include block protect register that will prevent accidental overwrite erase programmed memory FLASH control register that allows user specify whether block, page, entire array erased. There also charge pump clock frequency select bits, high-voltage enable bit, program/erase bits. (See Figure internal charge pump designed operate greatest efficiency frequency range between MHz. Because internal frequency MC68HC(9)08KH12 there (phase-locked loop) attached charge pump, charge pump must operate 10%.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
Because small size array, this will pose problems programming erasing, slow process marginally.
Address: $FE07 Read: Write: Reset: FDIV1 FDIV0 BLK1 BLK0 HVEN MARGIN ERASE
Freescale Semiconductor, Inc.
Figure Contents FLASH Control Register (FLCR) FDIV1 Frequency Divide Control This read/write together with FDIV0 selects factor which charge pump clock divided from system clock. FDIV0 Frequency Divide Control This read/write together with FDIV1 selects factor which charge pump clock divided from system clock. BLK1 Block Erase Control This read/write together with BLK0 allows erasing blocks varying size. BLK0 Block Erase Control This read/write together with BLK1 allows erasing blocks varying size. HVEN High-Voltage Enable This read/write enables charge pump drive high voltages program erase operations array. HVEN only either ERASE proper sequence program/margin read erase followed. High voltage enabled array charge pump High voltage disabled array charge pump
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note FLASH Memory
MARGIN Margin Read Control This read/write configures memory margin read operation. MARGIN cannot HVEN MARGIN will return unset automatically asserted when HVEN Margin read operation selected Margin read operation unselected ERASE Erase Control This read/write configures memory erase operation. ERASE interlocked with such that both bits cannot same time. Erase operation selected Erase operation unselected Program Control This read/write configures memory program operation. interlocked with ERASE such that both bits cannot same time. Program operation selected Program operation unselected Erasing FLASH Array this procedure erase block FLASH memory: ERASE bit, BLK0, BLK1, FDIV0, FDIV1 bits FLASH control register. Table block sizes Table charge pump clock frequency settings. Ensure that target portion array unprotected reading block protect register, address $FF8D. Write FLASH address with data within block address range desired. HVEN bit. Wait time, tERASE. Clear HVEN bit. Wait time, tKILL, high voltages dissipate. Clear ERASE bit. After time, tHVD, memory accessed read mode again.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc.
Freescale Semiconductor, Inc. Application Note
While these operations must performed order shown, other unrelated operations occur between steps. Table FLASH Erase Block Sizes
BLK1 BLK0 Block Size Full array: Kbytes Half array: Kbytes Eight rows: bytes Single (page): bytes
Freescale Semiconductor, Inc.
Table Charge Pump Clock Frequency Select
FDIV1 FDIV0 Pump Clock Frequency frequency frequency frequency frequency
Programming FLASH Array
Programming FLASH memory done page basis. page consists eight consecutive bytes starting from address $XXX0 $XXX8. purpose margin read mode ensure that data been programmed with sufficient margin long-term data retention. While performing margin read, operation same ordinary read mode except that built-in counter stretches data access additional eight cycles allow sensing lower cell current. Margin read mode imposes more stringent read condition bitcell ensure bitcell programmed with enough margin long-term data retention. During these eight cycles, counter continues run. user must account these extra cycles within feed loops. margin read cycle follow page programming operation only.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note FLASH Memory
program margin read FLASH memory, this algorithm: bit. This configures memory program operation enables latching address data programming. Read from block protect register. Write data eight bytes page being programmed. This requires eight separate write operations. HVEN bit.
Freescale Semiconductor, Inc.
Wait time, tPROG. Clear HVEN bit. Wait time, tHVTV. MARGIN bit. Wait time, tVTP. Clear bit. Wait time, tHVD. Read back data margin read mode. This done eight separate read operations which each stretched eight cycles. Clear MARGIN bit. Figure flowchart describing smart programming algorithm. assumptions made page program/margin read procedure that page programmed already erased. This program/margin read sequence repeated throughout memory until data programmed. minimum overall programming time least program disturb effect, smart programming algorithm must followed. associated specification limits parameters listed program erase routines listed Table
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
PROGRAM FLASH
INITIALIZE ATTEMPT COUNTER
FDIV BITS
READ FLASH BLOCK PROTECT REGISTER
WRITE DATA SELECTED PAGE
Freescale Semiconductor, Inc.
HVEN
WAIT Step CLEAR HVEN
WAIT HVTV MARGIN
WAIT CLEAR
WAIT MARGIN READ PAGE DATA
INCREMENT ATTEMPT COUNTER
CLEAR MARGIN
ATTEMPT COUNT EQUAL flsPulses PROGRAMMING OPERATION FAILED
MARGIN READ DATA EQUAL WRITE DATA PROGRAMMING OPERATION COMPLETE
Figure Smart Programming Algorithm FLASH Memory
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note FLASH Memory
Table Specification Limits Program/Erase Parameters
Characteristic FLASH pages FLASH bytes page FLASH read clock frequency FLASH charge pump clock frequency FLASH block/bulk erase time Symbol/Description tRead(1) tPump(2) tErase tKill tHVD flsPulses(3) tStep(4) tHVTV tVTP tRecovery(5) Units Pages Bytes Pulses Dummy read cycles Cycles Cycles Years
Freescale Semiconductor, Inc.
FLASH high voltage kill time FLASH return read time FLASH page program time FLASH page program step size FLASH HVEN margin high time FLASH margin high time FLASH return read after margin read time FLASH erase endurance(6) FLASH program endurance(7) FLASH data retention time(8)
Notes: tRead defined frequency range which FLASH memory read. tPump defined charge pump frequency required program, erase, margin read operations. flsPulses defined number pulses used during FLASH programming required smart program algorithm. tStep defined amount time during page program cycle that HVEN held high. tRecoveryis defined minimum number dummy reads FLASH location before accurate data read from memory after margin read mode used. minimum erase endurance value specifies each FLASH memory guaranteed work least this many erase cycles. minimum program endurance value specifies each FLASH memory guaranteed work least this many program cycles. FLASH guaranteed retain data over entire specified temperature range least minimum time specified.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note Keyboard Design Using MC68HC(9)08KH12
keyboard design using MC68HC(9)08KH12 displayed Figure seen, clock circuit constructed using total seven external components, five crystal oscillator PLL. crystal oscillator connected standard Pierce oscillator configuration. oscillator components include:
Freescale Semiconductor, Inc.
Fixed capacitor, Tuning capacitor, Feedback resistor, Optional series resistor, Crystal,
values these components dependent upon crystal manufacturers' specifications. drawn match Pierce oscillator requirements, removed depending upon clock frequency. higher frequencies, value shorted. low-cost, 6-MHz crystal provides clock MC68HC(9)08KH12. present chip design that 48-MHz 12-MHz clock frequencies provided module, supporting high-speed requirements upstream port potential high-speed peripherals connected four downstream ports. keyboard scan matrix, described earlier type keyboard design, occupies port pins. keyboard LEDs Lock, Caps Lock, Scroll Lock utilize three port pins, which capable sinking drive current. upstream port, which composed VDDREGOUT, DPLUS0, DMINUS0, configured with DPLUS0 pulled 3.3-volt signal, provided from VDDREGOUT 1.5-k resistor, also wired upstream connector which provides path back host downstream ports.
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note Keyboard Design Using MC68HC(9)08KH12
four downstream ports have 15-k pulldown resistors attached, pulling them when lines idle. transceiver pins also wired female connector providing connections. Notice that there indication whether downstream ports high speed they drawn Figure determination speed attached device made within attached device itself. peripheral connected individual downstream ports will have 1.5-k pullup resistor operating voltage, volts, attached appropriate transceiver pin. will attached DPLUS high speed device DMINUS low-speed device.
Freescale Semiconductor, Inc.
NOTE:
power/ground (VDD/VSS) pairs should isolated 10-nF capacitor pair.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note
CBYP
VDDA CGM- VSSA OSC2 VPP/IRQB VDDREGOUT
OSC1 PTD0 PTD1 PTD2 PTD3 PTD4 PTD5 PTD6 PTD7 PTA0 PTA1 PTA2 PTA3 PTA4 PTA5 PTA6 PTA7 PTB0 PTB1 PTB2 PTB3 PTB4 COLUMN COLUMN COLUMN COLUMN COLUMN COLUMN COLUMN COLUMN KEYBOARD
Freescale Semiconductor, Inc.
UPSTREAM PORT
DPLUS0 DMINUS0 DPLUS0 DMINUS0 DPLUS1 DMINUS1 DPLUS2 DMINUS2 DPLUS3 DMINUS3 DPLUS4 DMINUS4
DPLUS1 DMINUS1
DOWNSTREAM PORT DPLUS2 DMINUS2 DOWNSTREAM PORT DPLUS3 DMINUS3 DOWNSTREAM PORT DPLUS4 DMINUS4 DOWNSTREAM PORT
MC68HC(9)08KH12
PTC0 PTC1 PTC2 PTC3 PTC4 PTC5 PTC6 PTC7
OPTIONAL HIGHER FREQUENCY CBYP CONSULT CRYSTAL VENDOR DATA SHEET CRYSTAL LOAD CAPACITANCE CRYSTAL LOAD CAPACITANCE
LOCK CAPS LOCK SCROLL LOCK
Note: pairs shown should isolated using 10-nF capacitors.
Figure Keyboard Circuit Schematic Using MC68HC(9)08KH12
AN1748 More Information This Product, www.freescale.com MOTOROLA
Application Note Firmware MC68HC(9)08KH12
Firmware MC68HC(9)08KH12
Code development arduous peripheral manufacturer with limited resources lack experience with requirements forth devices. Motorola developed scalable firmware code library make transition from legacy type peripherals less painful reduce development times significantly. firmware library takes care many compatibility matters, providing conformant functions that perform many required operations. Utilizing this library from three months code development time, accelerating time market peripherals. This firmware library acquired from Motorola contacting local Motorola representative details.
Freescale Semiconductor, Inc.
Conclusion
MC68HC(9)08KH12 well-integrated, robust, versatile part peripheral manufacturers designing keyboard with high/low speed capability. Additional features microcontroller include integrated 3.3-volt voltage regulator, which guarantees that voltage source module stays within specifications. Motorola firmware library available fast code development fully scalable application which will used. Additional information firmware library example applications which MC68HC(9)08KH12 been used attained contacting your local Motorola representative.
AN1748 MOTOROLA More Information This Product, www.freescale.com
Freescale Semiconductor, Inc. Application Note References
Universal Serial Specification, Jan.15, 1996. Motorola Firmware Library User's Manual, Preliminary, Motorola. October 1997.
Freescale Semiconductor, Inc.
Motorola reserves right make changes without further notice products herein. Motorola makes warranty, representation guarantee regarding suitability products particular purpose, does Motorola assume liability arising application product circuit, specifically disclaims liability, including without limitation consequential incidental damages. "Typical" parameters which provided Motorola data sheets and/or specifications vary different applications actual performance vary over time. operating parameters, including "Typicals" must validated each customer application customer's technical experts. Motorola does convey license under patent rights rights others. Motorola products designed, intended, authorized components systems intended surgical implant into body, other applications intended support sustain life, other application which failure Motorola product could create situation where personal injury death occur. Should Buyer purchase Motorola products such unintended unauthorized application, Buyer shall indemnify hold Motorola officers, employees, subsidiaries, affiliates, distributors harmless against claims, costs, damages, expenses, reasonable attorney fees arising directly indirectly, claim personal injury death associated with such unintended unauthorized use, even such claim alleges that Motorola negligent regarding design manufacture part. Motorola registered trademarks Motorola, Inc. Motorola, Inc. Equal Opportunity/Affirmative Action Employer.
reach USA/EUROPE/Locations Listed: Motorola Literature Distribution, P.O. 5405, Denver, Colorado 80217, 1-800-441-2447 1-303-675-2140. Customer Focus Center, 1-800-521-6274 JAPAN: Nippon Motorola Ltd.: SPD, Strategic Planning Office, 141, 4-32-1 Nishi-Gotanda, Shinagawa-Ku, Tokyo, Japan. 03-5487-8488 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd., Ping Industrial Park, Ting Road, N.T., Hong Kong. 852-26629298 MfaxTM, Motorola Back System: RMFAX0@email.sps.mot.com; http://sps.motorola.com/mfax/; TOUCHTONE, 1-602-244-6609; Canada ONLY, 1-800-774-1848 HOME PAGE: http://motorola.com/sps/
Mfax trademark Motorola, Inc. Motorola, Inc., 1998
AN1748/D More Information This Product, www.freescale.com
Other recent searches
ZAMYK10C2 - ZAMYK10C2 ZAMYK10C2 Datasheet
M3D883 - M3D883 M3D883 Datasheet
M3823AGFHP - M3823AGFHP M3823AGFHP Datasheet
GS1085 - GS1085 GS1085 Datasheet
ADM3070E - ADM3070E ADM3070E Datasheet
ADM3071E - ADM3071E ADM3071E Datasheet
ADM3072E - ADM3072E ADM3072E Datasheet
ADM3073E - ADM3073E ADM3073E Datasheet
ADM3074E - ADM3074E ADM3074E Datasheet
ADM3075E - ADM3075E ADM3075E Datasheet
ADM3076E - ADM3076E ADM3076E Datasheet
ADM3077E - ADM3077E ADM3077E Datasheet
ADM3078E - ADM3078E ADM3078E Datasheet
ADM3074E - ADM3074E ADM3074E Datasheet
ADM3077E - ADM3077E ADM3077E Datasheet
Privacy Policy | Disclaimer
© 2012 Datasheet Archive
