nrf51 UART power consumption

[youssefchei]

Hi,

1-I did some test for nrf51422 (SDK12.3 + soft device S130) power consumption. result as below:

-system on sleep mode( without UART and BLE Advertise ):90uA

-system on sleep mode(with active UART and  BLE Advertise ):1.1mA

UART module current consumption is greater than 1 mA. According to the nrf51422 product specification, the max UART consumption is 220uA.

2-I read here https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk51.v9.0.0%2Fhardware_driver_uart.html that there is UART with Low Power mode, is there any example to help us implement the Low Power?

[Kenneth]

Hi,

You are right that the UART peripheral require 220uA, however the UART peripheral rely on some block resources, which may add to the system current consumption.

Regarding reducing power consumption maybe this thread may be useful:
https://devzone.nordicsemi.com/f/nordic-q-a/34692/low-power-uart-migration 

Best regards,
Kenneth