VI/O, VDD ≤3.6 V

[Inderjit Bains]

The Absolute Maximum rating of I/O pin voltage for VI/O, VDD ≤3.6 V is -0.3V to VDD + 0.3V in Table 185.  We would like to monitor the battery voltage using an AIN pin because we are planning to use a regulator for the board.  During power-up/power-down and in case of a power supply short to ground the voltage on the AIN pin may higher than VDD + 0.3V.  Is there a current limit for AIN pins that will prevent damage?  If yes, will a series 200K resistor connected to the battery satisfy the current limit?

[Inderjit Bains]

Maximum input voltage is 3.2V (lithium primary cell).

[haakonsh]

We have not characterized the device for operation outside the limits stated in production specification so we cannot guarantee performance for such cases. That said. after consulting design team we do not see any danger for circuit damage as long as voltage stays below 3.9 volt and the current is limited with a 200k Ohm resistor as suggested