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ADS7828: ads7828 - reading issues

Part Number: ADS7828


I am using smbus on RaspberryPi4 to read number off of ADS7828.

I write 0x48, 0x84 to read Ch0 in single ended mode.

I can't read read other Channels using the same scheme. When I try reading the Ch1 for example (using 0x48, 0xC4) - it return the reading of Ch0. This is so confusing.

What should write through smbus, to read all channels one by one?