UART current consumption

[Michael01101]

Hello,

I developed an application for a custom nrf52832 board. It uses the Nordic UART Service (NUS) to transmit data over BLE. This works fine.

At the moment I am trying to optimize the current consumtion of this application on the custom nrf52832 board. I have already made some measurements and I figured out the following:

If I initialize the UART by calling the uart_init() function, my current consumption increases by 1,35mA (V_cc = 1.8V). This looks a bit too high for me.

Can you please answer my following questions:

1. Is this the normal current consumption of the UART?

2. Are there any ways to lower the current consumption of the UART?

Thank you very much in advance.

[Turbo J]

Michael01101 said:

1. Is this the normal current consumption of the UART?

Yes.

Michael01101 said:

2. Are there any ways to lower the current consumption of the UART?

Not without deactivating the peripherial. UART(E) will keep the HFCLK on in order to be able to transmit/receive.

You can lower the current consumtion by using the integrated DCDC from a higher operating voltage (e.g. 3V3 instead of 1V8), but this won't help you when your design is intended for 1V8 operation.