To whom I may concern,
I am design an automotive application where quiescent current is critical.
Since leakage current from VBAT pin is quite high (2mA, page 6 of datasheet), I connected such pin to a dedicated net which is turned off when MCU is entering sleep mode.
Meanwhile, on SUPPLY pins quiscent current is acceptable (5uA, page 6 of datasheet) therefore I left such pins connected to permanent battery voltage.
My question are the followings:
- are there any risks in having SUPPLY pins powered ON while VBAT is powered OFF?
- May this configuration damage the chip internally?
- Is it prefereable to have VBAT and SUPPLY pins tied together and connected to a switchable power source?
Regards