View max6657-max6659 datasheet:

19-2034; Rev 1; 10/01 ±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms General Description Features The MAX6657/MAX6658/MAX6659 are precise, two- ¦ Dual Channel: Measures Remote and Local channel digital temperature sensors. Each accurately Temperature measures the temperature of its own die and one ¦ 11-Bit, 0.125°C Resolution remote PN junction, and reports the temperature in digi- tal form on a 2-wire serial interface. The remote junction ¦ High Accuracy ±1°C (max) from +60°C to +100°C can be a diode-connected transistor like the low-cost (Remote) NPN type 2N3904 or 2N3906 PNP type. The remote ¦ No Calibration Required junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor. ¦ Programmable Under/Overt