Over-consumption problem in sleep mode

[MERY]

Hello, we have made 50 cards with your microcontroller,out of the 50 cards there are 6 cards which consume about 10µA in sleep, while the others consume less than 1µA.
Have you ever had a similar case? Does exceeding the number of flash writes lead to this problem?

[Håkon Alseth]

Hi,

 

If you have configured one, or more, GPIOs as input with the register PIN_CNF, field "INPUT" set as "CONNECTED":

https://infocenter.nordicsemi.com/topic/ps_nrf52840/gpio.html?cp=4_0_0_5_8_1_9#register.PIN_CNF-0-31

 

Then the GPIO can potentially float in sleep mode, causing excessive current.

If you have any connections to external devices while in sleep, it is important that these are set to a defined level (VDD or GND, via a pull resistor).

 

Kind regards,

Håkon