Tool/software:
Hi Team,
Customer hope that during system startup or charging, no power is supplied to chips other than the MCU. When needed, the MCU should control the PMIC to supply power.
Currently, on the customer's schematic, PP3V3_S4 is supposed to be used as power supply for MCU, but there is an error with the net label, it should be PP3V3_S2 instead.
They intended to use VDDD as power supply for MCU, but this is not recommended since the maximum output current of VDDD is only 30mA. Therefore, one feasible approach is to implement a switching sequence similar to what is described in Figure 9-13 of the datasheet.
Here's how it works: EN_SW2 is pulled high via a pull-up resistor to VDDD, and after VDDD reaches stable, PP3V3_S2 can be used as power supply for MCU. Meanwhile, EN_SW1, 3, and 4 are pulled low via pull-down resistors to GND and controlled by the MCU.
Please confirm whether this approach is feasible or recommend a better alternative to the customer. I will share a link to E2E for further discussion
Thanks so much for your reply
Best regards,
Jason
