MSPM0G3507: About Vref Setting On ADC use

? ??

Part Number: MSPM0G3507
Other Parts Discussed in Thread: SYSCONFIG

Vref- not used, this pin is used as an ADC pin, and the reference source of ADC is set to Vref. When the voltage of the ADC pin where Vref- is located changes, the sampling values of other adc pins will change. How should I deal with this situation?

over 1 year ago

0 Brandon Fisher94 over 1 year ago

TI__Mastermind 28070 points

Hi,

If the VREF- function on the pin is disabled the voltage there should not affect the other ADC channels. You should be okay to sample as normal.

Best Regards,
Brandon Fisher

0 ? ?? over 1 year ago in reply to Brandon Fisher94

Prodigy 40 points

Yes, I set it that way.Also updated the sdk version to 1.30.The problem remains, if I set the reference voltage source of the adc to VDDA, the sampled value is normal.If set to Vref, the adc sampling value changes with the voltage of the adc pin where vref- is located

0 ? ?? over 1 year ago

Prodigy 40 points

I updated the sdk version to 1.30.The problem remains, if I set the reference voltage source of the adc to VDDA, the sampled value is normal.If set to Vref, the adc sampling value changes with the voltage of the adc pin where vref- is located

0 ? ?? over 1 year ago

Prodigy 40 points

I am using MSPM0G3507SRHBR.

0 Brandon Fisher94 over 1 year ago in reply to ? ??

TI__Mastermind 28070 points

Are you using the launchpad or a custom board? If you are on the launchpad have you removed R3?

Best Regards,
Brandon Fisher

0 ? ?? over 1 year ago in reply to Brandon Fisher94

Prodigy 40 points

Custom board.I looked at the schematic of launchpad, and r3 is a grounded 0 ohm resistance.My schematic design is vref- used as an ad pin, and the voltage of this pin will undoubtedly change, and the change will affect the adc pin whose reference voltage source is vref