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QN9080 ADC External Vref

Question asked by Kaival Shah on Oct 31, 2018
Latest reply on Feb 11, 2019 by Felipe García

I am using qn908xcdk_wireless_examples_bluetooth_wireless_uart_freertos demo code for my development. In my application, I want to use External Vref @PA07. An external voltage is 3.3.


The demo application is configured as 1.2 V bandgap. I changed the following parameters 

adcConfigStruct.refSource = kADC_RefSourceExtWithDriver; ---> In ADC_Init conifguration

adcSdConfigStruct.vinnSelect = kADC_VinnSelectVref; --> In ADC_SetSdConfig configuration


Do I need to do anything else? When I use 1.2 Internal application is giving proper ADC output through ADC_ConversionResult2Mv. But if I use PA07 then I am not getting proper output through ADC_ConversionResult2Mv API.