What the MAX6642ATT90+T does on the board
The MAX6642ATT90+T is a digital temperature sensor from Analog Devices that measures its own die temperature and, via an external diode-connected transistor, a remote hot spot. It reports both readings over an SMBus interface at 10-bit resolution. The part integrates a One-Shot conversion trigger, a programmable limit with an output switch, and a standby mode for power-sensitive designs. Accuracy is rated ±2°C typical, ±3°C worst-case over the full range — tight enough for thermal monitoring of a processor die, power module, or battery cell.