nRF52 sleep - wake up on edge - extensive power consumption

[vit bernatik]

Hello, we were measuring sleep modes and it consumes around 1.3uA which is correct. But when we needed to be woken up on edge we found out it consumes extra 8uA! Are you aware of this big sleep power consumption issue??

More precisely the power consumption increase when I set this:

NRF_GPIOTE->CONFIG[i] =   GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos
                                | (BUTTON_1 + i)                << GPIOTE_CONFIG_PSEL_Pos
                                | GPIOTE_CONFIG_MODE_Event      << GPIOTE_CONFIG_MODE_Pos;

To remedy this issue I had to remove edge detection before sleep:

NRF_GPIOTE->CONFIG[0] &= ~3;
__WFE();

But we are thinking that - if we will have in future components that are having short pulse to signalize IRQ to nRF52 is it possible to detect edge without big sleep power consumption?

[Stian Røed Hafskjold]

Yes, you can find the issue in the errata here: infocenter.nordicsemi.com/.../anomaly_832_97.html

You must enable the SENSE signal on one of the GPIOs to wake up the chip. This signal can also generate a PORT event in the GPIOTE module. This does not consume any extra current.

[vit bernatik]

thank you for link to errata. Are you going to fix that in new silicon revision? And if so when is a new silicon planned to be availalbe?

[Stian Røed Hafskjold]

Sorry, I can't comment on future plans or releases here on Devzone. Please contact your regional sales manager.