How to configure UART with low power

RE: How to configure UART with low power

Nate — Tue, 05 Dec 2017 21:04:00 GMT

Did you figure this out? I am running into the same issues with power and the uart and my numbers are almost the same as yours as far as power with the uart enabled and disabled

RE: How to configure UART with low power

fanleung — Fri, 08 Sep 2017 06:42:04 GMT

Hi, thank you for answer.

Howerve, if I delete uart_init(), the current is nearly 20uA and 200uA while advertising and connected.

I used to use SPI peripherals on other products to drive Sensor chip, and connect the phone to send the same size data, the total current is only 2.4mA. I think the UART is the internal peripherals, and it should be lower power.

Accoding to your description, do you think UART cost 2.4mA is normal ?

Or do you have any suggestion for me to low the current ?

thanks again!

RE: How to configure UART with low power

thischier — Fri, 08 Sep 2017 05:53:00 GMT

I guess that you forgot the shared resources and other power consumption which is added to the above mentioned electrical characteristics...

For example, when you are sending some data over UART and haven't configured the UART with easy DMA, your processor is running and you need to add the power consumption of the CPU, the same with the needed crystals etc...