46.6.1.3 Voltage Reference

An on-die analog voltage reference provides a typical output voltage of 1.144V. The temperature drift of the voltage reference can be approximated by a linear fit. For H-grade parts, the temperature drift is measured during manufacturing and stored in the calibration registers (ROM). Two measurements are made: one at a low temperature, TL, and another at a high temperature, TH. At both temperatures TL and TH, VREF_AFE voltage and ADC_TEMP_OUT (reading of the temperature sensor by ADC Channel 0) parameters are saved. From the data obtained, the user can implement a software compensation of the voltage reference.