VDD VDDH DCCH Power configuration

[yuhuidx]

VDD& VDDH& DCCH

Is the connection correct? What should be paid attention to when designing the power supply?

[mash273]

Hello, 

Config no.	Supply configuration		Enabled features
	VDDH	VDD	EXTSUPPLY	DCDCEN0	DCDCEN1	USB	NFC
Config. 4	Battery/Ext. regulator	N/A	Yes	Yes	Yes	Yes	No

Hello, in config 4 is listen the schematic is for use in Battery / Ext. regulator and USB is YES.

Can I use USB and Battery at the same time? Normaly i have to use a diode.

When i use USB Only with DCDCEN = 0, It still have 1,8 V on VDD_NRF.

So, do i use a Diode or can i power off the 1,8V with Software?

I think it is not good to have a charge effect on normal batterys.

[Jared]

Hi,

The nRF will be in normal mode if you connect VDDH and VDD to the same node, which means that the first regulator stage won't be used which makes DCCH unnecessary. Please see the documentation regarding power supply and reference design for more information.

regards

Jared