Hello, I’m using nRF52840 with SDK 16 and SD 7. My purpose is to save as much power is possible using high-frequency clock (32MHz) only during periodic duties and BLE activity and low-frequency clock (32KHz crystal) otherwise. I’ve programmed app-timer and app-scheduler: if I use only I/O the sleep time power consumption is about 3uA. If I power-on UART with FIFO all the time, power consumption is about 1mA. So I need to power UART only when code uses it in app-scheduler event handler: I invoke app_uart_init() and app_uart_close() after few milliseconds every 1s, but unfortunately the power consumption is 1mA all the time. Apparently, app_uart_close() doesn’t power-off the UART; I follow various post in this blog with no success.
Thank you
Elisa
