[ARM] ADC Measurement NAU7802

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satyagp

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Hi

I want to measure the 4-20mA current.i CONVERTED current to to voltage convertion for my measurement.I am Using NAU7802ADC and Connected as mentioned in Application Circut in Datasheet with single Ended mode.
AVDD=3.3V
VREFP=3.3V and VREFN=0V
Internal RC Osc used.


My Probem
A) I was unable to measure full range.i.e..0-3.3V range.
I am getting range 0--1.675V with digital Output maximum is 000000-7FFFFF ONLY.

B) While measuring input there is a 32mV error.

please help me how to resolve it? Am doing correct or not?.I want to nullyfy the error.

Note : Please see my attachment schematic and Pictures.
 

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Check your initialization code.

Thanks for reply.Now I am getting 7 mV error after activatin PGA option.
Why am getting 1.65V=ADC count0x7FFFFF?Its the half of the count only.As per Datasheet in Functional Description mentioned that in single Ended mode will get Full scale rrange for half of the VREF.How can I use this ADC perfectly with 24Bit resolution in my application.My application is measure DC Voltage is 0-1.5v Max.
 

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