TPS63901YCJR output stuck at 1.8 V

[Medcuore2024]

Hi team ,

This (TPS63901YCJR) IC is not giving an output of 3.3 V. It always gives 1.8 V. According to the schematic, if I set the SEL pin high, it should give 1.8 V, and if I set the SEL pin low, it should give 3.3 V. However, regardless of the SEL configuration, the output remains at 1.8 V. Could you please help me understand why this is happening, or let me know if I am missing anything in my setup?

I have attached my schematic below,

Regards
PraveenRaj

[boaks]

Not sure, what you measure:
Powering via USB I get 3.3V between GND and VIO.
To change that, use the console on the 2. serial channel and use the viosel cmd.

[boaks]

nRF9151 connect kit schematic shows, that the SEL is connected to the P0.8 of the nRF52820 (page 2 and 3).