ADC Delta Sigma Math

	MattCoughlin posted on 19 Jun 2012 7:23 AM PST Senior Member 17 Forum Posts

I'm using a Delta Sigma ADC in my project, and I'm having trouble getting correct values for Vin. The math from the example project doesn't seem to work, and I'm not sure what the real formula I should be using is. Does anyone know the correct equation to convert the result from the ADC to the real Vin?

Thank you

Re: ADC Delta Sigma Math

	danaaknight posted on 19 Jun 2012 10:27 AM PST Top Contributor 1773 Forum Posts

These API calls make life easy -

int32ADC_CountsTo_mVolts(int32adcCounts)

Description: ConvertstheADCoutput tomVasa32-bit integer.Forexample,if theADCmeasured

0.534V, thereturnvaluewouldbe534mV.

Parameters: int32adcCounts:ResultfromtheADCconversion.

ReturnValue: int32:Result inmV.

SideEffects: None

int32ADC_CountsTo_uVolts(int32adcCounts)

Description: ConvertstheADCoutput toµVasa32-bit integer.Forexample,if theADCmeasured

ñ0.02345V, thereturnvaluewouldbeñ23450µV.

Parameters: int32adcCounts:ResultfromtheADCconversion.

ReturnValue: int32:Result inµV.

SideEffects: None

floatADC_CountsTo_Volts(int32adcCounts)

Description: ConvertstheADCoutput tovoltsasafloatingpointnumber.Forexample,if theADC

measuresavoltageof 1.2345V,thereturnedresult wouldbe+1.2345V.

Parameters: int32adcCounts:ResultfromtheADCconversion.

ReturnValue: Float: Resultof thelast ADCconversion.

SideEffects: None

Regards, Dana.

Re: ADC Delta Sigma Math

	pvkv posted on 21 Jun 2012 05:46 AM PST Cypress Employee 15 Forum Posts

HI,

If you are using VSS to VDD range then you need to set your VDD voltage in systems tab. Open PSOC Creaotor .cydwr file. Open systems tab. In that you will find VDD setting. The APIs use this VDD value to convert from counts to actual voltage.

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ADC Delta Sigma Math

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