Compiler/TDA4VMXEVM: How to set ADC reference voltage?

user4431315

Part Number: TDA4VMXEVM

Tool/software: TI C/C++ Compiler

Hi:

When I use ADC to sample the voltage, I find the ADC value is not correct. When I use adc_app demo to sample the voltage, the ADC value is about 1.5v, but the voltage is 0.96V in fact. I think that I don't set ADC's reference voltage correctly. So how to set the ADC REFP and REFN?

Thanks!

over 5 years ago

0 Vineet Roy over 5 years ago

TI__Mastermind 37435 points

Hi,

REFP and REFN are not pinned out. REFP is internally connected to 1.8V rail and REFN is connected to GND. Please check ADC_CONTROL register, HI_MID_SEL bit to see whether your reference voltage is set to REFP or not.

Regards

Vineet

0 user4431315 over 5 years ago in reply to Vineet Roy

Intellectual 380 points

Hi:

This problem has been resolved, It's our hardware's design problem which lead to the current flow backward mcu.

Thanks!

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Compiler/TDA4VMXEVM: How to set ADC reference voltage?