You need to use the multiplexer to choose which input you want to convert.
PS: I strongly suggest you to use a quite more modern PSoC4. Despite the 32-bit functionality a prototype kit offers debugging capabilities as breakpoints, inspecting and setting variables etc.
Thanks for reply,
CY8C28452 already have multiple adc, still i need to add extra multiplexer?
Is there any other way to read multiple adc channel without any external multiplexer or other extra circuit ?
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I am not talking about external MUXes, the PSoC1 offers pin MUX capabilities, look for the AMUX4 module and see datasheet
PS: Still recommending to use a PSoC4