Microchip ADC MCP3426 - 131071 @ 2.0 V problem

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1

Hi,

I have connected a 16 bit Microchip MCP3426 and communicate by the wire lib and the MCP342x ADC lib. The problem is that the chip will give the 131071 value already when the analog voltage is about 2.0 V. Does anybody know an issue for that? The whole system runs at 5 V. Please keep in mind that I am a beginner.

0 V > 0

1 V > somewhere between 0 an 131071

2 V > 131071

5 V > 131071

2

Found it by myself. Internal reference voltage is 2.048 V