JAJSGG2C October 2018 – June 2019 ADS125H02
The ADC has a temperature sensor comprised of two internal diodes with one diode having 80 times the current density of the other. The difference in current density of the diodes yields a differential output voltage that is proportional to absolute temperature. To measure the temperature sensor, write 110b to the MUX[2:0] control bits to select the multiplexer for the temperature sensor and then start a new ADC conversion. Equation 4 shows how to convert the temperature sensor reading to degrees Celsius (°C):
When measuring the temperature sensor, set the gain to 1 and disable auto-zero mode. As a result of the low package-to-PCB thermal resistance, the internal temperature closely tracks the PCB temperature. Be aware that device self-heating increases the internal temperature relative to the surrounding PCB.