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Part: MAX6642ATT9C
Category:
Sensors
-> Temperature Sensors
Description: MAX6642 ±1°C, Smbus-compatible Remote/local Temperature Sensor With Overtemperature Alarm
Company: Maxim Integrated Products
Datasheet: Download MAX6642ATT9C datasheet File size : 770 kB
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Datasheet text preview:
19-2920; Rev 0; 8/03
±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
General Description
The MAX6642 is a precise, two-channel digital temperature sensor. It accurately measures the temperature of its own die and a remote PN junction, and reports the temperature data over a 2-wire serial interface. The remote PN junction is typically a substrate PNP transist o r on the die of a CPU, ASIC, GPU, or FPGA. The remote PN junction can also be a discrete diode-connected small-signal transistor. The 2-wire serial interface accepts standard system management bus (SMBusTM), Write Byte, Read Byte, Send Byte, and Receive Byte commands to read the temperature data and to program the alarm thresholds. To enhance system reliability, the MAX6642 includes an SMBus timeout. The temperature data format is 10 bit with the least significant bit (LSB) corresponding to +0.25°C. The ALERT output asserts when the local or remote overtemperature thresholds are violated. A fault queue may be used to prevent the ALERT output from setting until two consecutive faults have been detected. Measurements can be done autonomously or in a single-shot mode. R e m o t e accuracy is ±1°C maximum error between +60°C and +100°C. The MAX6642 operates from -40°C t o +125°C, and measures remote temperatures between 0°C and +150°C. The MAX6642 is available in a 6-pin TDFN package.
Features
o Dual Channel: Measures Remote and Local Temperature o +0.25°C Resolution o High Accuracy ±1°C (max) (Remote) and ±2°C (Local) from +60°C to +100°C o Measures Remote Temperature Up to +150°C o Programmable Overtemperature Alarm Temperature Thresholds o SMBus/I2CTM-Compatible Interface o Tiny TDFN Package
MAX6642
Ordering Information
PART MAX6642ATT90-T MAX6642ATT92-T MAX6642ATT94-T MAX6642ATT96-T MAX6642ATT98-T MAX6642ATT9A-T MAX6642ATT9C-T MAX6642ATT9E-T TEMP RANGE -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C PIN-PACKAGE 6 TDFN 6 TDFN 6 TDFN 6 TDFN 6 TDFN 6 TDFN 6 TDFN 6 TDFN
Applications
Desktop Computers Notebook Computers Servers Thin Clients Test and Measurement Workstations Graphic Cards
SMBus is a trademark of Intel Corp. Purchase of I2C components of Maxim Integrated Products, Inc. or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. Pin Configuration and Functional Diagram appear at end of data sheet.
Typical Operating Circuit Selector Guide
0.1µF 3.3V 47 10k EACH
PART MAX6642ATT90-T MAX6642ATT92-T MAX6642ATT94-T MAX6642ATT96-T MAX6642ATT98-T MAX6642ATT9A-T MAX6642ATT9C-T MAX6642ATT9E-T
MEASURED TEMP RANGE 0°C to +150°C 0°C to +150°C 0°C to +150°C 0°C to +150°C 0°C to +150°C 0°C to +150°C 0°C to +150°C 0°C to +150°C
TOP MARK AFC AFD AFE AFF AEW AFG AFH AFI
µP 2200pF
VCC
DXP
MAX6642
SDA
DATA CLOCK INTERRUPT TO µP
SCLK ALERT GND
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm MAX6642
ABSOLUTE MAXIMUM RATINGS
All Voltages Referenced to GND VCC .........-0.3V to +6V DXP....-0.3V to (VCC + 0.3V) SCLK, SDA, ALERT ........-0.3V to +6V SDA, ALERT Current ..........-1mA to +50mA Continuous Power Dissipation (TA = +70°C) 6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW ESD Protection (all pins, Human Body Model) .......±2000V Junction Temperature ......+150°C Operating Temperature Range .......-40°C to +125°C Storage Temperature Range .....-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1)
PARAMETER Supply Voltage Temperature Resolution TRJ = +60°C to +100°C, TA = +25°C to +85°C TRJ = 0°C to +125°C TRJ = +125°C to +150°C Local Temperature Error Supply Sensitivity of Temperature Error Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Power-On-Reset (POR) Threshold POR Threshold Hysteresis Standby Supply Current Operating Current Average Operating Current Conversion Time Conversion Rate Remote-Diode Source Current ALERT Output-Low Sink Current Output-High Leakage Current VOL = 0.4V VOL = 0.6V VOH = VCC 1 4 1 mA µA tCONV fCONV IRJ High level Low level 80 8 From stop bit to conversion completion 106 SMBus static During conversion VCC falling edge 1.5 UVLO Falling edge of VCC disables ADC 2.4 VCC = 3.3V TA = +60°C to +100°C TA = 0°C to +125°C -1.0 -3.0 -3.5 -2.0 -3.0 ±0.2 2.7 90 2.0 90 3 0.5 260 125 8 100 10 120 12 143 10 1.0 2.4 2.95 SYMBOL VCC CONDITIONS MIN 3.0 0.25 10 +1.0 +3.0 +3.5 +2.0 +3.0 °C °C/V V mV V mV µA mA µA ms Hz µA °C TYP MAX 5.5 UNITS V °C Bits
Remote Temperature Error
VCC = 3.3V
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±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1)
PARAMETER Logic Input Low Voltage Logic Input High Voltage Input Leakage Current Output Low Sink Current Input Capacitance SMBus TIMING (Note 2) Serial Clock Frequency Bus Free Time Between STOP and START Condition START Condition Setup Time Repeat START Condition Setup Time START Condition Hold Time STOP Condition Setup Time Clock Low Period Clock High Period Data Setup Time Receive SCLK/SDA Rise Time Receive SCLK/SDA Fall Time Pulse Width of Spike Suppressed SMBus Timeout tSU:STA tH D : S T A tS U : S T O tL O W tH I G H t HD:DAT tR tF tSP tT I M E O U T SDA low period for interface reset 0 20 28 90% to 90% 10% of SDA to 90% of SCLK 90% of SCLK to 90% of SDA 10% to 10% 90% to 90% (Note 4) fS C L K tBUF (Note 3) 4.7 4.7 50 4 4 4.7 4 250 1 300 50 40 100 kHz µs µs ns µs µs µs µs µs µs ns ns ms SYMBOL VIL VIH IL E A K IOL CIN VCC = 3.0V VIN = GND or 5.5V VOL = 0.6V 2.2 -1 6 5 +1 CONDITIONS MIN TYP MAX 0.8 UNITS V V µA mA pF
MAX6642
SMBus-COMPATIBLE INTERFACE (SCLK and SDA)
Note 1: Note 2: Note 3: Note 4:
All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design. Timing specifications guaranteed by design. The serial interface resets when SCLK is low for more than tTIMEOUT. A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCLK's falling edge.
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