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MAX6647 Dataheets PDF



Part Number MAX6647
Manufacturers Maxim
Logo Maxim
Description +145C Precision SMBus-Compatible Remote/ Local Sensors
Datasheet MAX6647 DatasheetMAX6647 Datasheet (PDF)

19-2540; Rev 1; 7/03 +145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms General Description The MAX6646/MAX6647/MAX6649 are precise, twochannel digital temperature sensors. The devices accurately measure the temperature of their own die and a remote PN junction, and report the temperature in digital form using a 2-wire serial interface. The remote PN junction is typically the emitter-base junction of a commoncollector PNP on a CPU, FPGA, or ASIC. The 2-wire seri.

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19-2540; Rev 1; 7/03 +145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms General Description The MAX6646/MAX6647/MAX6649 are precise, twochannel digital temperature sensors. The devices accurately measure the temperature of their own die and a remote PN junction, and report the temperature in digital form using a 2-wire serial interface. The remote PN junction is typically the emitter-base junction of a commoncollector PNP on a CPU, FPGA, or ASIC. The 2-wire serial interface accepts standard system management bus (SMBus) 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 MAX6646/MAX6647/MAX6649 include an SMBus timeout. A fault queue prevents the ALERT and OVERT outputs from setting until a fault has been detected one, two, or three consecutive times (programmable). The MAX6646/MAX6647/MAX6649 provide two system alarms: ALERT and OVERT. ALERT asserts when any of four temperature conditions are violated: local overtemperature, remote overtemperature, local undertemperature, or remote undertemperature. OVERT asserts when the temperature rises above the value in either of the two OVERT limit registers. The OVERT output can be used to activate a cooling fan, or to trigger a system shutdown. Measurements can be done autonomously, at the programmed conversion rate, or in a single-shot mode. The adjustable conversion rate allows optimizing supply current and temperature update rate to match system needs. Remote accuracy is ±1°C maximum error between +60°C and +145°C with no calibration needed. The MAX6646/MAX6647/MAX6649 operate from -55°C to +125°C, and measure temperatures between 0°C and +145°C. The MAX6646/MAX6647/MAX6649 are available in an 8-pin µMAX package. Features o Dual Channel: Measures Remote and Local Temperature o 0.125°C Resolution o High Accuracy ±1°C (max) from +60°C to +145°C (Remote), and ±2°C (max) from +60°C to +100°C (Local) o Measures High-Ideality Thermal Diodes Up to +170°C (Apparent) +145°C (Real) o Two Alarm Outputs: ALERT and OVERT o Programmable Under/Overtemperature Alarm Temperature Thresholds o Programmable Conversion Rate o SMBus-Compatible Interface o SMBus Timeout MAX6646/MAX6647/MAX6649 Ordering Information PART TEMP RANGE PINMEASURED PACKAGE TEMP RANGE 0°C to +145°C 0°C to +145°C 0°C to +145°C MAX6646MUA -55°C to +125°C 8 µMAX MAX6647MUA -55°C to +125°C 8 µMAX MAX6649MUA -55°C to +125°C 8 µMAX Typical Operating Circuit 3.3V 0.1µF 200Ω Applications Graphics Processors Desktop Computers Notebook Computers Servers Thin Clients Workstations Test and Measurement Multichip Modules µP VCC MAX6646 SDA MAX6647 MAX6649 SCLK ALERT OVERT GND 10kΩ EACH DATA CLOCK INTERRUPT TO µP TO FAN DRIVER OR SYSTEM SHUTDOWN DXP 2200pF DXN Selector Guide, Pin Configurations, and Functional Diagram appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 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. +145°C Precision SMBus-Compatible Remote/ Local Sensors with Overtemperature Alarms MAX6646/MAX6647/MAX6649 ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND VCC ...........................................................................-0.3V to +6V DXP.............................................................-0.3V to (VCC + 0.3V) DXN .......................................................................-0.3V to +0.8V SCLK, SDA, ALERT, OVERT.....................................-0.3V to +6V SDA, ALERT, OVERT Current .............................-1mA to +50mA DXN Current .......................................................................±1mA Continuous Power Dissipation (TA = +70°C) 8-Pin µMAX (derate 5.9mW/°C above +70°C) .............471mW ESD Protection (all pins, Human Body Model) ................±2000V Junction Temperature ......................................................+150°C Operating Temperature Range .........................-55°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 = -55°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +100°C.) (Note 1) PARAMETER Supply Voltage Temperature Resolution VCC = 3.3V, TA = +100°C, TRJ = +60°C to +145°C Remote Temperature Error VCC = 3.3V, TA = +.


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