Hello,
I need some clarifications about external crystals for nRF52832.
We are evaluating a prototype system with two units A and B each containing an nRF52832.
A and B will communicate via UART.
Unit A will also use BLE to communicate with other units.
Unit A shall wake up on RTC every 10 ms to check if UART is connected to unit B.
Unit B are powered from unit A so will be an POR every time unit A is connected.
- Unit A needs a 32 MHz crystal since it will use BLE, correct?
- Unit A needs a 32 kHz crystal for the RTC wakeup, correct?
- We don't need a 32 kHz crystal for unit B, correct?
- Do we need a 32 MHz crystal for unit B? According to the answer here we don't need a crystal at all since we are not using BLE but according to the design guide lines found here the 32 MHz crystal is mandatory on nRF52832. I know the question in the first link is about nRF51 but the answer indicates that nRF52/nRF51 works in the same way.
The main reason to exclude crystals in unit B is to save space.
Thanks in advance, Mattias
