The first step to program the INA239-Q1 is to properly set the device and ADC configuration registers. On initial power up the CONFIG and ADC_CONFIG registers are set to the reset values as shown in Table 7-5 and Table 7-6. In this default power on state the device is set to measured on the ±163.84 mV range with the ADC continuously converting the shunt voltage, bus voltage, and temperature. If the default power up conditions do not meet the design requirements, these registers will need to be set properly after each V_S power cycle event.