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XMC™ Forum Discussions

User7921
Level 3
Level 3
Hi,

at the moment I'm playing with the XMC 1302 to see if it will fit for our next development.
Because the internal analogue ref is very poor, I'm measuring an external 4096 mV ref with one of the
analogue inputs and calculate the voltage of the LSB for the other inputs.
So far so good.
But I found out that the measured values of input voltages near GND are very high.
On all used inputs, when connecting them with GND, I read values of 30 to 50 digits.
Is this normal? How to get rid of this?
Of course we will do a factory hardware calibration, but with these high offsets

Michael
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