nRF5340 VDD input result in VDDH output DC voltage.

[YF Tsai]

Hi, we use the Fanstel BT40 design a RS232 & USB carrier board, when we use battery 3.3V to VDD, there is a DC2.8V output from VDDH. VDDH should be power input, why there is DC output?

[Martin Sivertsen]

Hello,

In Normal voltage mode VDDH shall be shorted to VDD so you shouldn't have different voltage on VDD and VDDH.

Are VDD and VDDH connected in some way?

Do you have schematics for the board you have made?

Best regards,

Martin S.

[YF Tsai]