9.4.4 Low Power Sleep Mode

The device has a low power sleep mode option to reduce the power consumption on analog supplies (AVDD and VBAT). There are two lower power modes and the choice depends on AVDD supply. First, if the AVDD supply does not drop below the minimum specified voltage, the lowest power mode can be activated by performing a software reset B0_P0_R1[0]=1, waiting 100us and then writing shutdown POR blocks B0_P0_R121[7]=1. To exit the low power sleep mode write B0_P0_R121[7]=0 to power up the Avdd and Vbat POR. The part ideally can be placed in low power mode by only shutting down the POR blocks. However, due to non-default configurations TI recommends the software reset.

If the AVDD POR must remain enabled an alternate low power mode should be used. To enable the second low power mode write B0_P0_R4[7:0]=0 and B0_P0_R5[7:0]=0.