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.
Voltage observation with /Without connect MCU pin
Without connect ckt with MCU pin
connect ckt with MCU pin 2 (AN13)