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CCS/TMS320F28027: F28027 controlSTICK

Part Number: TMS320F28027


Tool/software: Code Composer Studio

Hello,

I have configured 3 ADC with ePWM such that 2 ADCs sample simultaneously when time counter TBCTR reaches Period value and the 3rd ADC samples when TBCTR reaches zero value. In this configuration when I apply the PWM to my ADC pins it works fine. two ADC result registers show 3.3V and 1 shows 0V value. Till here everything is fine.

When I apply an external signal from signal generator of the same frequency of PWM it is not sampling as expected. It shows sometimes the correct value 3.3 (or 2.5V which i have from signal generator) or sometimes zero on the same pin. and for the other pins too it is shows such behavior. Moreover, I am not using the probe to take signal from signal generator because of its high resistance I am using simple converter to banana pins and then low resistance wire. 

Any help and suggestion will be appreciated.