nRF52840 LDO and DC/DC power supply regulator

[Dhara]

Hi,

I have few queries regarding the internal regulators of nRF52840.

1) Is it mandatory to configure the internal LDO or DC/DC regulators of nRF52840 ?

2) If these regulators are DISABLED then is it going to effect the operation of internal blocks/ module of nRF52840?

3) Can these regulators be configured and use for external devices.? YES -> what is the voltage and current ratings that is available from LDO and DC/DC reg. ?

I have referred the Ch.5 of "nRF52840_DK_PB_v1.0" but still little confused on the above points.

Thanks.

[ketiljo]

1) REG0 is deactivated if VDD is connected to VDDH. If not, and you want to use REG0, you need to configure the voltage

2) If VDDH is connected to VDD, you don't need to do anything else. This will limit the supply voltage to 1.9 to 3.6 V only.

3) See the product specification, VDDOUT and IEXT

Note that you need build code QIAA-Dx0 or CKAA-Dx0 to be able to use REG0 to supply external circuitry due errata 197 and 202 

 

[Dhara]

Okay understood.. Many thanks ketiljo