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MC9S12XHZ256 ADC ISSUE

Question asked by Rajni Rajpoot on Jul 25, 2017
Latest reply on Aug 1, 2017 by Daniel Martynek

We are using MC9S12XHZ256 – 144 pin microcontroller, In this project we are using 9 ADC channel. 

ADC channel AN13 (MCU pin no 2) voltage goes down from 4.6 to 1.8V ,when we connect with circuit and other channel are working fine with same circuit.We have tested it with multiple board but same issue found. ADC channel configured by processor expert.

 

circuit :-

 

Voltage observation with /Without connect MCU pin

Sr. no.

Without connect ckt with MCU pin

 connect ckt with MCU pin 2 (AN13)

1

4.006V

3.992V

2

3.071V

3.052V

3

2.001V

1.988V

4

1.010V

1.006V

 

 

Thanks

Rajni

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