Is nrF52840 VDDH pin only used for REG0 LDO/DCDC regulator output

Question

Is nrF52840 VDDH pin only used for REG0 LDO/DCDC regulator output to generate VDD power for the GPIO circuitry? 
 
 or is VDDH power used to power some other internal circuits in the nrF52840? 
 
 BR 
 Øystein

Simonr · Accepted Answer

Hi Øystein 
 There should not be any problem powering the nRF52840 with 1.8V in NORMAL mode. In HIGH power mode the output from REG0 can be used to supply external circuitry from the VDD pin. The VDDH is not used to power any additional circuitry inside the nRF52840. You can read more on the external circuitry supply in section 5.3.1.3 in the nRF52840 product specification. 
 Best regards, 
 Simon

Is nrF52840 VDDH pin only used for REG0 LDO/DCDC regulator output

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