I have built a board that is powered using a LiC and to conserve some power i run it under 1MHz (524KHz).
I need 2 UARTs and one ADC for my application. However, since there's only 1 LPUART i use second UART to connect a cheap BLE module that i can separately power as needed.
I can keep module unpowered however UART connection under 1MHz drops below 115200 ratio which i want to use. As a second option, i can use HSI 16MHz and lower it to 4MHz to reach 115200.
I disable UART if i don't need it. I noticed it consumes power over tx/rx somehow.
Same applies with ADC, but i don't need rapid readings from it thus keeping it sync with cpu.
I am curious how it would affect consumption if i use HSI for UART. Is there any paper explaining this consumption? I keep it 9600 baud now, but if it consumes 10uA or something, i can use async HSI for UART as well.
I do not use anything but MSI+LSE for this application, but consumption after enabling HSI for UART, or maybe HSI for ADC is my question.
I can measure power using tools, but i am curious about technical details.
