MAX6642

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 transistor on the die of a CPU, ASIC, GPU, or FPGA. The remote PN junction of MAX6642 can also be a discrete diode-connected small-signal transistor.

The 2-wire serial interface of MAX6642 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 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 of MAX6642 may be used to prevent theALERT output from setting until two consecutive faults have been detected. Measurements can be done autonomously or in a single-shot mode.

Remote accuracy is ±1°C maximum error between +60°C and +100°C. The MAX6642 operates from -40°C to +125°C, and measures remote temperatures between 0°C and +150°C. The MAX6642 is available in a 6-pin TDFN package.