What's the minimum reference circuitry for running nrf52810 without RF?

[nine-fox]

Hi,

May I ask what's the minimum reference circuitry for running nrf52810 without RF? Thanks.

Our need is as follows.

1) RF, eg, Antenna is not needed
2) GPIOTE 1 channel and 1 UARTE is needed. No high accurcy needed.
3) Low power mode can be supported

Based on my understanding, I removed almost all caps, except the 4.7uf. Am I right?

See the reference circuitry I drafted:

Thanks,
Vincent

[bjorn-spockeli]

Hi Vincent, 

You will need to keep all the caps connected to the DEC1..4 as they are decoupling caps for the internal regulators, i.e. C4, C7 and C10. 

You also need to keep the VDD decoupling caps, i.e. C5 and C8. 

The UARTE peripheral requires the HFCLK, hence the baudrate accuracy will be lower if the HFINT is used as the clock source. 

Best regards

Bjørn