NRF52840 Li battery and charger

RE: NRF52840 Li battery and charger

ketiljo — Mon, 18 Nov 2019 14:39:00 GMT

VDD should only be connected to the other VDD pins. The output of REG0 is connected to VDD internally, see figure 3 here: https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2_0_0

RE: NRF52840 Li battery and charger

Tai — Mon, 18 Nov 2019 13:48:18 GMT

Thanks for your reply.

Which confog should we use?

What should we connect to VDD_nrf?

RE: NRF52840 Li battery and charger

ketiljo — Mon, 18 Nov 2019 12:54:10 GMT

1. See this schematic: https://infocenter.nordicsemi.com/topic/ps_nrf52840/ref_circuitry.html?cp=4_0_0_6_2_0#concept_hqh_j22_fq

You can connect the battery to the VDDH pin.

2.. Yes. the VBUS pin must have 5 V for the correct function. This will also detect VBUS when connected to USB

3. You can use any 2.4 GHz antenna. Make sure you have the appropriate tuning components in case you use a chip antenna, see this whitepaper for more: https://infocenter.nordicsemi.com/pdf/nwp_017.pdf