8-Lead, Low-Cost, System Temperature Monitor ADM1020 ADM1020 two-

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8-Lead, Low-Cost, System Temperature Monitor ADM1020 ADM1020 two-

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FEATURES On-Chip Remote Temperature Sensing Calibration Necessary Accuracy On-Chip Sensor Accuracy Remote Sensor Programmable Over/Under Temperature Limits Programmable Conversion Rate 2-Wire SMBusSerial Interface Supports SMBus Alert Operating Current Standby Current +5.5 Supply 8-Lead SOIC Package APPLICATIONS Desktop Computers Notebook Computers Smart Batteries Industrial Controllers Telecommunication Equipment Instrumentation
8-Lead, Low-Cost, System Temperature Monitor ADM1020
ADM1020 two-channel digital thermometer under/over temperature alarm, intended personal computers other systems requiring thermal monitoring management. device measure temperature microprocessor using diode-connected transistor, which provided on-chip case Pentium® similar processors, low-cost discrete device such 2N3904. novel measurement technique cancels absolute value transistor's base emitter voltage, that calibration required. second measurement channel measures output on-chip temperature sensor, monitor temperature device environment. ADM1020 communicates over two-wire serial interface compatible with System Management (SMBus) standards. Under over temperature limits programmed into devices over serial bus, ALERT output signals when on-chip remote temperature range. This output used interrupt, SMBus alert.
FUNCTIONAL BLOCK DIAGRAM
ADDRESS POINTER REGISTER ONE-SHOT REGISTER CONVERSION RATE REGISTER ON-CHIP TEMP. SENSOR LOCAL TEMPERATURE VALUE REGISTER LOCAL TEMPERATURE LIMIT COMPARATOR LOCAL TEMPERATURE HIGH LIMIT COMPARATOR REMOTE TEMPERATURE LIMIT COMPARATOR REMOTE TEMPERATURE HIGH LIMIT COMPARATOR LOCAL TEMPERATURE LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER REMOTE TEMPERATURE LIMIT REGISTER REMOTE TEMPERATURE HIGH LIMIT REGISTER CONFIGURATION REGISTER EXTERNAL DIODE OPEN-CIRCUIT STATUS REGISTER INTERRUPT MASKING ALERT
ANALOG
8-BIT A-TO-D CONVERTER BUSY RUN/STANDBY REMOTE TEMPERATURE VALUE REGISTER
ADM1020
SMBUS INTERFACE
SDATA
SCLK
SMBus trademark Intel Corporation. Pentium registered trademark Intel Corporation.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Site: http://www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 1999
ADM1020-SPECIFICATIONS
MAX,
unless otherwise noted)
Units Test Conditions/Comments Guaranteed Missed Codes
Parameter POWER SUPPLY Temperature Resolution Temperature Error, Local Sensor Temperature Error, Remote Sensor Supply Voltage Range Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Power-On Reset Threshold Threshold Hysteresis Standby Supply Current Average Operating Supply Current Auto-Convert Mode, Averaged Over Seconds Conversion Time Remote Sensor Source Current
2.95
+60°C +100°C Note Input, Disables ADC, Rising Edge VDD, Falling Edge2 SMBus Activity SCLK 0.25 Conversions/Sec Rate Conversions/Sec Rate From Stop Conversion Complete (Both Channels) Forced 0.65 High Level Level Momentary Power-On Reset
Source Voltage Address Bias Current SMBUS INTERFACE Logic Input High Voltage, STBY, SCLK, SDATA Logic Input Voltage, STBY, SCLK, SDATA SMBus Output Sink Current ALERT Output Sink Current Logic Input Current, IIH, SMBus Input Capacitance, SCLK, SDATA SMBus Clock Frequency SMBus Clock Time, tLOW SMBus Clock High Time, tHIGH SMBus Start Condition Setup Time, tSU:STA SMBus Repeat Start Condition Setup Time, tSU:STA SMBus Start Condition Hold Time, tHD:STA SMBus Stop Condition Setup Time, tSU:STO SMBus Data Valid SCLK Rising Edge Time, tSU:DAT SMBus Data Hold Time, tHD:DAT SMBus Free Time, tBUF SCLK Falling Edge SDATA Valid Time, tVD,DAT
SDATA Forced ALERT Forced
tLOW Between Points tHIGH Between Points Between Points Time from SDATA SCLK Time from SCLK SDATA Time from SDATA SCLK Between Start/Stop Condition Master Clocking
NOTES Operation guaranteed design, production tested. Guaranteed design, production tested. Specifications subject change without notice.
REV.
ADM1020
ABSOLUTE MAXIMUM RATINGS* FUNCTION DESCRIPTION
Positive Supply Voltage (VDD -0.3 -0.3 .-0.3 +0.6 SCLK, SDATA, ALERT -0.3 Input Current, SDATA Input Current, Rating, Pins (Human Body Model) 4000 Continuous Power Dissipation +70°C Derating above +70°C mW/°C Operating Temperature Range -55°C +125°C Maximum Junction Temperature max) +150°C Storage Temperature Range -65°C +150°C Lead Temperature, Soldering Vapor Phase +215°C Infrared +200°C
*Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
Mnemonic ALERT SDATA SCLK
Description Positive Supply, +5.5 Positive Connection Emitter Remote Temperature Sensor. Negative Connection Base Remote Temperature Sensor. Address Select Three-State Logic Input. Supply Connection. Open-Drain Logic Output Used Interrupt SMBus Alert. Logic Input/Output, SMBus Serial Data. Open-Drain Output. Logic Input, SMBus Serial Clock.
CONFIGURATION
THERMAL CHARACTERISTICS
SCLK
8-Lead SOIC Package: 150°C/Watt.
SDATA VIEW (Not Scale) ALERT
ADM1020
ORDERING GUIDE Temperature Range +85°C Package Description 8-Lead Small Outline (SOIC) Package Option SO-8
Model* ADM1020AR-REEL ADM1020AR-REEL7
*REEL contains 2500 pieces; REEL7 contains 1000 pieces.
REV.
ADM1020 -Typical Performance Characteristics
TEMPERATURE ERROR READING (5V) LEAKAGE RESISTANCE MEASURED TEMPERATURE
Figure Temperature Error Board Track Resistance
Figure Pentium Temperature Measurement ADM1020 Reading
TEMPERATURE ERROR TEMPERATURE ERROR
250mV REMOTE
100mV REMOTE
500k FREQUENCY
CAPACITANCE
Figure Temperature Error Power Supply Noise Frequency
Figure Temperature Error Capacitance Between
TEMPERATURE ERROR 100mV SUPPLY CURRENT 50mV 500k FREQUENCY 100k 250k 500k 750k SCLK FREQUENCY
25mV
Figure Temperature Error Common-Mode Noise Frequency
Figure Standby Supply Current Clock Frequency
REV.
ADM1020
TEMPERATURE ERROR 10mV WAVE 100k 500k FREQUENCY SUPPLY VOLTAGE Volts ADDX HI-Z
SUPPLY CURRENT
ADDX
Figure Temperature Error Differential-Mode Noise Frequency
SUPPLY CURRENT 0.0625 +3.3V
Figure Standby Supply Current Supply Voltage
TEMPERATURE
IMMERSED +115 FLUORINERT BATH
0.125 0.25 CONVERSION RATE TIME
Figure Operating Supply Current Conversion Rate
FUNCTIONAL DESCRIPTION
Figure Response Thermal Shock
Control configuration functions consist switching device between normal operation standby mode. masking enabling ALERT output. selecting conversion rate.
MEASUREMENT METHOD
ADM1020 contains two-channel A-to-D converter with special input-signal conditioning enable operation with remote on-chip diode temperature sensors. When ADM1020 operating normally, A-to-D converter operates free-running mode. analog input multiplexer alternately selects either on-chip temperature sensor measure local temperature, remote temperature sensor. These signals digitized results stored local remote temperature value registers 8-bit, twos complement words. measurement results compared with local remote, high temperature limits, stored four on-chip registers. limit comparisons generate flags that stored Status Register, more out-of-limit results will cause ALERT output pull low. limit registers programmed, device controlled configured, serial System Management (SMBus). contents register also read back SMBus.
simple method measuring temperature exploit negative temperature coefficient diode, base-emitter voltage transistor, operated constant current. Unfortunately, this technique requires calibration null effect absolute value which varies from device device. technique used ADM1020 measure change when device operated different currents. This given
KT/q
where: Boltzmann's constant. charge electron (1.6 10-19 Coulombs). absolute temperature Kelvins. ratio currents.
REV.
ADM1020
IBIAS LOWPASS FILTER 65kHz
REMOTE SENSING TRANSISTOR
VOUT+ VOUT-
BIAS DIODE
*CAPACITOR OPTIONAL. ONLY NECESSARY NOISY ENVIRONMENTS. 2.2nF TYPICAL, MAX.
Figure Input Signal Conditioning
Figure shows input signal conditioning used measure output external temperature sensor. This figure shows external sensor substrate transistor, provided temperature monitoring some microprocessors, could equally well discrete transistor. discrete transistor used, collector will grounded, should linked base. prevent ground noise interfering with measurement, more negative terminal sensor referenced ground, biased above ground internal diode input. sensor operating noisy environment, optionally added noise filter. value typically 2200 should more than 3000 section Layout Considerations more information measure VBE, sensor switched between operating currents resulting waveform passed through low-pass filter remove noise, hence chopper-stabilized amplifier that performs functions amplification rectification waveform produce voltage proportional VBE. This voltage measured give temperature output 8-bit twos complement format. further reduce effects noise, digital filtering performed averaging results measurement cycles. Signal conditioning measurement internal temperature sensor performed similar manner.
TEMPERATURE DATA FORMAT
Table Temperature Data Format
Temperature -128°C -125°C -100°C -75°C -50°C -25°C -1°C +1°C +10°C +25°C +50°C +75°C +100°C +125°C +127°C
ADM1020 REGISTERS
Digital Output 0000 0011 1100 0101 1110 0111 1111 0000 0001 1010 1001 0010 1011 0100 1101 1111
corresponds 1°C, theoretically measure from -128°C +127°C, although practical lowest value limited -65°C device maximum ratings. temperature data format shown Table results local remote temperature measurements stored local remote temperature value registers, compared with limits programmed into local remote high limit registers.
ADM1020 contains nine registers that used store results remote local temperature measurements, high temperature limits, configure control device. description these registers follows, further details given Tables should noted that ADM1020's registers dual port, have different addresses read write operations. Attempting write read address, read from write address, will produce invalid result. Register addresses above reserved future used factory test purposes should written
Address Pointer Register
Address Pointer Register itself does have, require, address, register which first data byte every write operation automatically written. This data byte address pointer that sets other registers second byte write operation, subsequent read operation.
REV.
ADM1020
power-on default value Address Pointer Register 00h, read operation performed immediately after poweron, without first writing address pointer, value local temperature will returned, since register address 00h.
Value Registers
ALERT interrupt latch reset reading Status Register, will reset when ALERT output been serviced master reading device address, provided error condition gone away Status Register flag bits have been reset.
Table Status Register Assignments
ADM1020 registers store results local remote temperature measurements. These registers written only read over SMBus.
Status Register
Name BUSY LHIGH* LLOW* RHIGH* RLOW* OPEN*
Function When Converting When Local High-Temp Limit Tripped When Local Low-Temp Limit Tripped When Remote High-Temp Limit Tripped When Remote Low-Temp Limit Tripped When Remote Sensor Open-Circuit Reserved
Status Register indicates that busy converting when high. Bits flags that indicate results limit comparisons. local and/or remote temperature measurement above corresponding high temperature limit below corresponding temperature limit, then more these flags will set. flag that remote temperature sensor open-circuit. These five flags NOR'd together, that them high, ALERT interrupt latch will ALERT output will low. Reading Status Register will clear five flag bits, provided error conditions that caused flags have gone away. While limit comparator tripped value register containing out-of-limit measurement, sensor open-circuit, corresponding flag cannot reset. flag only reset corresponding value register contains in-limit measurement, sensor good.
*These flags stay high until Status Register read they reset POR.
Configuration Register
bits Configuration Register used. which power-on default, device operating mode with converting. device standby mode does convert. Standby mode also selected taking STBY low. configuration register used mask ALERT output. which power-on default, ALERT output enabled. ALERT output disabled.
Table III. List Registers
Read Address (Hex) Applicable Applicable
Write Address (Hex) Applicable Applicable Applicable Applicable Applicable Applicable Applicable Applicable
Name Address Pointer Local Temperature Value Remote Temperature Value Status Configuration Conversion Rate Local Temperature High Limit Local Temperature Limit Remote Temperature High Limit Remote Temperature Limit One-Shot Reserved Reserved Reserved Reserved Reserved Reserved Reserved Manufacturer Revision Code
Power-On Default Undefined 0000 0000 (00h) 0000 0000 (00h) Undefined 0000 0000 (00h) 0000 0010 (02h) 0111 1111 (7Fh) (127°C) 1100 1001 (C9h) (-55°C) 0111 1111 (7Fh) (127°C) 1100 1001 (C9h) (-55°C) Note Undefined (Note Undefined (Note Undefined (Note 1000 0000 (Note Undefined (Note 0000 0000 (Note Undefined 0100 0001 (41h) Undefined
NOTES Writing address causes ADM1020 perform single measurement. data register such does matter what data written These registers reserved future versions device.
REV.
ADM1020
Table Configuration Register Assignments
Name MASK1 RUN/STOP
Function ALERT Enabled ALERT Masked Run; Standby Reserved
Power-On Default
same bus, and/or avoid conflict with other devices. Although only address pins provided, three-level input, grounded, left unconnected, tied VDD, that total three different addresses possible, shown Table should noted that state address only sampled power-up, changing after power-up will have effect.
Table Device Addresses
Conversion Rate Register
lowest three bits this register used program conversion rate dividing clock 128, give conversion times from (code 07h) seconds (code 00h). This register written read back over SMBus. higher five bits this register unused must zero. slower conversion times greatly reduces device power consumption, shown Table
Table Conversion Rate Register Codes
Device Address 1001 1001 1001
NOTE: sampled power-up only.
serial protocol operates follows: master initiates data transfer establishing START condition, defined high-to-low transition serial data line SDATA, while serial clock line SCLK remains high. This indicates that address/data stream will follow. slave peripherals connected serial respond START condition, shift next eight bits, consisting 7-bit address (MSB first) plus bit, which determines direction data transfer, i.e., whether data will written read from slave device. peripheral whose address corresponds transmitted address responds pulling data line during period before ninth clock pulse, known Acknowledge Bit. other devices remain idle while selected device waits data read from written master will write slave device. master will read from slave device. Data sent over serial sequences nine clock pulses, eight bits data followed Acknowledge from slave device. Transitions data line must occur during period clock signal remain stable during high period, low-to-high transition when clock high interpreted STOP signal. number data bytes that transmitted over serial single READ WRITE operation limited only what master slave devices handle. When data bytes have been read written, stop conditions established. WRITE mode, master will pull data line high during 10th clock pulse assert STOP condition. READ mode, master device will override acknowledge pulling data line high during period before clock pulse. This known acknowledge. master will then take data line during period before 10th clock pulse, then high during 10th clock pulse assert STOP condition. number bytes data transferred over serial operation, possible read write operation, because type operation determined beginning cannot subsequently changed without starting operation.
Data
Conversion/Sec 0.0625 0.125 0.25 Reserved
Average Supply Current
Limit Registers
ADM1020 four Limit Registers store local remote, high temperature limits. These registers written read back, over SMBus. high limit registers perform comparison while limit registers perform comparison. example, high limit register programmed with 80°C, then measuring 81°C will result alarm condition.
One-Shot Register
One-Shot Register used initiate single conversion comparison cycle when ADM1020 standby mode, after which device returns standby. This data register such write operation that causes oneshot conversion. data written this address irrelevant stored.
SERIAL INTERFACE
Control ADM1020 carried serial bus. ADM1020 connected this slave device, under control master device, e.g., PIIX4
ADDRESS
general, every SMBus device 7-bit device address (except some devices that have extended, 10-bit addresses). When master device sends device address over bus, slave device with that address will respond. ADM1020 address select pin, allow selection device address, that more than ADM1020 used
REV.
ADM1020
case ADM1020, write operations contain either bytes, while read operations contain byte, perform following functions: write data device data registers read data from Address Pointer Register must that correct data register addressed, then data written into that register read from first byte write operation always contains valid address that stored Address Pointer Register. data written device, then write operation contains second data byte that written register selected address pointer register. This illustrated Figure 12a. device address sent over followed This followed data bytes. first data byte address internal data register written which stored Address Pointer Register. second data byte data written internal data register. When reading data from register there possibilities: ADM1020's Address Pointer Register value unknown desired value, first necessary correct value before data read from desired data register. This done performing write ADM1020 before, only data byte containing
SCLK
register read address sent, data written register. This shown Figure 12b. read operation then performed consisting serial address, followed data byte read from data register. This shown Figure 12c. Address Pointer Register known already desired address, data read from corresponding data register without first writing Address Pointer Register, Figure omitted. NOTES Although possible read data byte from data register without first writing Address Pointer Register, Address Pointer Register already correct value, possible write data register without writing Address Pointer Register, because first data byte write always written Address Pointer Register. Don't forget that ADM1020 registers have different addresses read write operations. write address register must written address pointer data written that register, possible read data from that address. read address register must written address pointer before data read from that register.
SDATA START MASTER
ACK. ADM1020
ACK. ADM1020
FRAME SERIAL ADDRESS BYTE (CONTINUED)
FRAME ADDRESS POINTER REGISTER BYTE
(CONTINUED)
ACK. STOP ADM1020 MASTER
FRAME DATA BYTE
Figure 12a. Writing Register Address Address Point Register, then Writing Data Selected Register
SCLK
SDATA START MASTER
ACK. ADM1020
ACK. ADM1020 STOP MASTER
FRAME SERIAL ADDRESS BYTE
FRAME ADDRESS POINTER REGISTER BYTE
Figure 12b. Writing Address Pointer Register Only
SCLK
SDATA START MASTER
ACK. ADM1020
ACK. STOP MASTER MASTER
FRAME SERIAL ADDRESS BYTE
FRAME DATA BYTE FROM ADM1020
Figure 12c. Reading Data from Previously Selected Register
REV.
ADM1020
ALERT output goes whenever out-of limit measurement detected, remote temperature sensor opencircuit. open-drain requires pull-up VDD. Several ALERT outputs wire-ANDED together, that common line will more ALERT outputs goes low. ALERT output used interrupt signal processor, used SMBALERT. Slave devices SMBus normally signal master that they want talk, SMBALERT function allows them more ALERT outputs connected common SMBALERT line connected master. When SMBALERT line pulled devices, following procedure occurs illustrated Figure
MASTER RECEIVES SMBALERT START ALERT RESPONSE ADDRESS MASTER SENDS READ COMMAND DEVICE ADDRESS DEVICE SENDS ADDRESS STOP
ALERT OUTPUT
SENSOR FAULT DETECTION
ADM1020 fault detector input that detects external sensor diode open-circuit. This simple voltage comparator that trips voltage exceeds (typical). output this comparator checked when conversion initiated, sets Status Register fault detected. remote sensor voltage falls below normal measuring range, example diode being short-circuited, will output -128 (1000 0000). Since normal operating temperature range device only extends down -55°C, this output code should never seen normal operation, interpreted fault condition. Since will outside power-on default temperature limit (-55°C) limit that would normally programmed, short-circuit sensor will cause SMBus alert. this respect ADM1020 differs from improves upon, competitive devices that output zero external sensor goes short-circuit. These devices misinterpret genuine measurement fault condition. external diode channel being used shorted out, resulting ALERT cleared writing (-128°C) limit register.
Figure SMBALERT
SMBALERT pulled low. Master initiates read operation sends Alert Response Address (ARA 0001 100). This general call address that must used specific device address. device whose ALERT output responds Alert Response Address master reads device address. address device known interrogated usual way. more than device's ALERT output low, with lowest device address will have priority, accordance with normal SMBus arbitration. Once ADM1020 responded Alert Response Address, will reset ALERT output, provided that error condition that caused ALERT longer exists. SMBALERT line remains low, master will send again, until devices whose ALERT outputs were have responded.
POWER STANDBY MODES
APPLICATIONS INFORMATION
FACTORS AFFECTING ACCURACY Remote Sensing Diode
ADM1020 designed work with substrate transistors built into processors, with discrete transistors. Substrate transistors will generally types with collector connected substrate. Discrete types either NPN, connected diode (base shorted collector). transistor used then collector base connected emitter transistor used then collector base connected emitter user choice case substrate transistors discrete transistor used best accuracy will obtained choosing devices according following criteria: Base-emitter voltage greater than 0.25 highest operating temperature. Base-emitter voltage less than 0.95 lowest operating temperature. Base resistance less than Small variation (say 150) which indicates tight control characteristics. Transistors such 2N3904, 2N3906 equivalents SOT-23 package suitable devices use.
ADM1020 into power standby mode setting Configuration Register. With ADM1020 operates normally. When high, inhibited, conversion progress terminated without writing result corresponding value register. SMBus still enabled. Power consumption standby mode reduced less than there SMBus activity, there clock data signals bus. When one-shot conversion both channels initiated writing One-Shot Register (address 0Fh).
-10-
REV.
ADM1020
LAYOUT CONSIDERATIONS
Digital boards electrically noisy environments, ADM1020 measuring very small voltages from remote sensor, care must taken minimize noise induced sensor inputs. following precautions should taken: Place ADM1020 close possible remote sensing diode. Provided that worst noise sources such clock generators, data/address buses CRTs avoided, this distance inches. Route tracks close together, parallel, with grounded guard tracks each side. Provide ground plane under tracks possible. wide tracks minimize inductance reduce noise pickup. track minimum width spacing recommended.
10mil 10mil 10mil 10mil 10mil 10mil 10mil
Place bypass capacitor close 2200 input filter capacitors across close ADM1020. distance remote sensor more than inches, twisted pair cable recommended. This will work about feet. really long distances feet) shielded twisted pair such Belden #8451 microphone cable. Connect twisted pair shield close ADM1020. Leave remote shield unconnected avoid ground loops. Because measurement technique uses switched current sources, excessive cable and/or filter capacitance affect measurement. When using long cables, filter capacitor reduced removed. Cable resistance also introduce errors. series resistance introduces about 0.5°C error.
APPLICATION CIRCUITS
Figure shows typical application circuit ADM1020, using discrete sensor transistor connected shielded, twisted pair cable. pull-ups SCLK, SDATA ALERT required only they already provided elsewhere system.
+3.3V REQUIRED ADDRESS PIIX4 CHIP
Figure Arrangement Signal Tracks
minimize number copper/solder joints, which cause thermocouple effects. Where copper/solder joints used, make sure that they both path same temperature. Thermocouple effects should should major problem corresponds about thermocouple voltages about mV/°C temperature difference. Unless there thermocouples with temperature differential between them, thermocouple voltages should much less than
ADM1020
2N3904 SHIELD ALERT OPTIONAL SDATA SCLK
Figure Typical ADM1020 Application Circuit
REV.
-11-
ADM1020
SCLK, SDATA pins ADM1020 interfaced directly SMBus controller such Intel Xcelerator (PIIX4) chip type 82371AB. Figure shows ADM1020 might integrated into system using this type controller.
PROCESSOR
BUILT-IN SENSOR SLOTS
HOST
SECOND LEVEL CACHE
HOST-TO-PCI BRIDGE
MAIN MEMORY (DRAM)
(3.3V 30/33MHz) HARD DISK PORT ULTRA DMA/33 HARD DISK 8237 (PIIX4) PORT I,O] (30+)
ADM1020
ALERT SCLK SDATA SERIAL PORT PARALLEL PORT FLOPPY DISK CONTROLLER INFRARED
SMBUS ISA/EIO (3.3V, TOLERANT)
AUDIO
KEYBOARD
BIOS
Figure Typical System Using ADM1020
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
8-Lead SOIC (SO-8)
0.1968 (5.00) 0.1890 (4.80)
0.1574 (4.00) 0.1497 (3.80)
0.2440 (6.20) 0.2284 (5.80)
0.0500 (1.27) 0.0098 (0.25) 0.0040 (0.10) SEATING PLANE 0.0688 (1.75) 0.0532 (1.35) 0.0192 (0.49) 0.0138 (0.35) 0.0098 (0.25) 0.0075 (0.19)
0.0196 (0.50) 0.0099 (0.25)
0.0500 (1.27) 0.0160 (0.41)
-12-
REV.
PRINTED U.S.A.
C3445-4-4/99

8-Lead, Low-Cost, System Temperature Monitor ADM1020 ADM1020 two-

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