View max6652 datasheet:

19-1959; Rev 1; 8/01 Temperature Sensor and System Monitor in a 10-Pin µMAX General Description Features The MAX6652 system supervisor monitors multiple ¦ Monitors Four Voltages (2.5V, 3.3V, 12V, VCC) power-supply voltages, including its own, and also fea- ¦ Monitors Local Temperature tures an on-board temperature sensor. Voltages and temperature are converted to an 8-bit code using an ¦ Temperature Measurement Accuracy, analog-to-digital converter (ADC). A multiplexer automat- ±2°C (TA = +25°C) ically sequences through the voltage and temperature ¦ User-Programmable Voltage and Temperature measurements. The digitized signals are then stored in registers and compared to the over/under threshold lim- Thresholds its programmed over the 2-wire serial interface. ¦ Alert Funct