View max6690 datasheet:

19-2190; Rev 0; 10/01 2°C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface General Description Features The MAX6690† is a precise digital thermometer that ¦ High Accuracy ±2°C (max) from +70°C to +100°C reports the temperature of both a remote P-N junction (Remote) and its own die. The remote junction can be a diode-con- ¦ 11-Bit, 0.125°C Resolution nected transistor—typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type—that replaces ¦ Dual Channel: Measures Remote and Local conventional thermistors or thermocouples. Remote Temperature accuracy is ±2°C for multiple transistor manufacturers, ¦ No Calibration Required with no calibration needed. The remote junction can also be a common-collector PNP, such as a substrate PNP of ¦ Progra