nRF52810 using internal power supply for external 1.8V IC

[Jirka]

Hi, I have not found any diagram/schematics of nRF52810 internal power supply. Is there any available?

I have not found any description of DEC2, DEC3 and DEC4 pins in manual, however I checked their voltage on devout and it is (VDD=3.0V):

DEC1 = 1.1V

DEC2 = 1.3V

DEC3 = 3.0V

DEC4 = 1.8V

We have nRF52810 power by VDD connected to external 3.0V. We need to power also other onboard IC with max supply voltage 1.8V (<10mA). 

Could we use the nRF52810 internal power supply for it?

Thanks

Jiri

[Stian Røed Hafskjold]

Hi, these are decoupling pins for the internal regulators. You can not use them to supply power to other devices. The internal regulators are switching mode automatically based on the internal current load. During idle (i.e. CPU and other peripherals sleeping) the regulators will be in ULP mode (LDO burst mode), and only able to supply in the uA range. Applying a current of 10mA will lead to a reset.

Best regards,
Stian