RE: What are ultra low power options with RTC wakeup?

Jared — Wed, 11 Sep 2024 08:10:53 GMT

Hi,

You're correct in your understanding. The nRF52840 offers two low-power sleep modes:

System On Sleep (also called IDLE sleep): In this mode, the CPU enters a low-power state by executing _wfe(). It remains in this state until an interrupt is triggered. The current consumption in this mode is typically around 2 µA, and the CPU can quickly resume execution directly from where it left off.
System Off Sleep: This is the lowest power mode, where the CPU's core functionality, along with peripherals and clocks, is turned off. The CPU can only be awakened by a reset, a GPIO signal, an NFC wake-on-field event, a VBUS_Detect event, or the LPCOMP. When the CPU wakes from System Off Sleep, it performs a power-on reset, meaning the device will reinitialize.

Could you clarify your concerns about performing a reset after System Off Sleep, and what are your specific low-power requirements?

regards

Jared