I have been developing a project with the MOD54415 & the MOD-Dev-70 1.9 development board. I'm experiencing a strange phenomenon and I hope someone here will be able to explain it.
I've boiled down the problem to a use-case.
- Init ADC Single Ended
- Read ADC_IN5, get value X
- POWER UP DAC
- Read ADC_IN5, get value X+unexplained offset
Here is the source code to my use case : If I let the J2[11] (ADC_IN5) pin floating, the program output is:
Code: Select all
ADC_IN5 With DACs Powered On
(1127) 0.918989 V
ADC_IN5 With DACs Powered Off
(22) 0.017939 V
Code: Select all
ADC_IN5 With DACs Powered On
(1656) 1.350352 V
ADC_IN5 With DACs Powered Off
(1356) 1.105723 V
Any idea what could be causing this? I have tried it on 3 different MOD54415 boards.
Thanks for your support NB community...!