nrf_pwr_mgmt_run() mode entry anomaly after disabling scanning and UART.

[Jing Luo]

Hello Nordic,

  Based on the nRF52805 chip, when enabling scanning and sending the scanned data via UART, the system occasionally fails to enter the sleep mode properly after transmission completion, resulting in a current consumption between 200~300μA. The power consumption graph measured by PPK2 is shown below.

I confirmed the following：

1. the code definitely executes to the sleep mode entry function.
2. UARTE0->ENABLE == 0.
3. if nrf_uarte_disable(NRF_UARTE0) is not called, the power consumption remains between 200 to 300 μA each time.

thanks

[Håkon Alseth]

Hi,

 

Is the sequence outlined here followed when disabling the UARTE peripheral?

https://docs.nordicsemi.com/bundle/ps_nrf52805/page/uarte.html#ariaid-title8

 

Please note that you should stop the UART receiver and transmitter, and await for the EVENTS_RXTO and EVENTS_TXSTOPPED before calling .ENABLE=0.

 

Kind regards,

Håkon