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EV2400: I2C port voltage change

Part Number: EV2400
Other Parts Discussed in Thread: BQSTUDIO

Hi,

I have tried but could not succeed in changing the I2C pull-up voltage from 3.3V to 1.8V. I have made following changes to EV2400EVM.

VPUV.2 is 3.3V with R38 as 10K

1. Changed R38 to 35K, VPUV.2 is 1.99V

2. Disconnected / lifted 6,7 pins of U14. Changed R38 - 56.2K and at C32 placed 28K. still noticed VPUV.2 is 1.99V

Can you please check and suggest on bringing voltage to 1.8V.

1. 

Regards,

Mani