The MAX6690 is a precise digital thermometer from Maxim that reports the temperature of both a remote P-N junction and its own die.
The MAX6690 is a precise digital temperature sensor that measures both a remote P‑N junction and its own die. It communicates via a 2‑wire SMBus/I²C‑compatible interface and offers programmable under/over‑temperature alarms. The device supports dual‑channel operation, providing local and remote temperature readings with high accuracy and optional parasitic resistance cancellation.
The datasheet includes absolute maximum ratings, detailed electrical characteristics, pin descriptions, typical operating curves, PCB layout recommendations, and low‑power standby operation. It also covers recommended wiring for long‑distance remote sensing and guidelines for noise filtering in noisy environments.
| Supply Voltage Range | +3.0 V to +5.5 V |
|---|---|
| Package | 16‑pin QSOP |
| Resolution (Extended Mode) | 11‑bit, 0.125 °C LSB |
| Resolution (Legacy Mode) | 7‑bit, 1 °C LSB |
| Accuracy (Remote Sensor) | ±2 °C (max) from +70 °C to +100 °C |
| Operating Temperature Range | -55 °C to +125 °C |
| Number of Temperature Channels | 2 (local and remote) |
The device operates from +3.0 V to +5.5 V.
It provides two channels: one for the local die temperature and one for a remote P‑N junction.
Set bit 4 of the configuration register to 1 to enable PRC mode.
In extended mode the sensor provides 11‑bit resolution with a 0.125 °C LSB.