Part # MAX6640 datasheet

Part Manufacturer: Maxim


Part Description: MAX6640 DS

Part Details:

19-3344; Rev 1; 11/07 EVALUATION KIT AVAILABLE 2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller MAX6640 General Description Features The MAX6640 monitors its own temperature and one Two Thermal-Diode Inputs external diode-connected transistor or the temperaturesof two external diode-connected transistors, typically Local Temperature Sensor available in CPUs, FPGAs, or GPUs. The 2-wire serial 1°C Remote Temperature Accuracy (+60°C to interface accepts standard System Management Bus +100°C) (SMBusTM) write byte, read byte, send byte, andreceive byte commands to read the temperature data Two PWM Outputs for Fan Drive (Open Drain; can and program the alarm thresholds. Temperature data be Pulled Up to +13.5V) can be read at any time over the SMBus, and three pro- Programmable Fan-Control Characteristics grammable alarm outputs can be used to generateinterrupts, throttle signals, or overtemperature shut- Automatic Fan Spin-Up Ensures Fan Start down signals. Controlled Rate-of-Change Ensures Unobtrusive The temperature data is also used by the internal dual Fan-Speed Adjustments PWM fan-speed controller to adjust the speed of up totwo cooling fans, thereby minimizing noise when the ±4% Fan-Speed Measurement Accuracy system is running cool, but providing maximum cooling Temperature Monitoring Begins at POR for Fail- when power dissipation increases. Speed control is Safe System Protection accomplished by tachometer feedback from the fan, sothat the speed of the fan is controlled, not just the PWM OT and THERM Outputs for Throttling or duty cycle. Accuracy of speed measurement is ±4%. Shutdown The MAX6640 is available in 16-pin QSOP and 16-pin Measures Temperatures Up to +150°C TQFN 5mm x 5mm packages. It operates from 3.0V to Tiny 5mm x 5mm 16-Pin TQFN and QSOP 3.6V and consumes just 500µA of supply current. Packages Applications Ordering Information Desktop Computers OPERATING MEASUREMENT PIN- Notebook Computers PART RANGE RANGE PACKAGE Workstations

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MAX6640.pdf Datasheet