TM4C1294NCPDT Internal Temperature Sensor Get Confused

[hasanhasan 0]

Hello ;

 

We use internal temperature sensor of microcontroller . When we use just internal temperature sensor code we get true adc values and degrees . In our project we do pull-up for some pins . When we pull-up with 

 (for example)   " pinMode(PE_3, INPUT_PULLUP); "   we get wrong adc values . If we dont pull-up , ADC is working true . 

 

Is ADC effected from pins or what is a problem ? 

Does anyone have idea ? 

Sincereley

[jsolarski 94]

Yes, Pins will affect ADC values, for internal temp. My suggestion would do pull downs, on those ports connected to the ADC.

 

when you do pull ups, there may be some leakage into the ADC that could skew the readings.