MSP432P401R: ADC sampling VCC which is influenced by GSM

user5137556

Part Number: MSP432P401R

Hi Guys，

My design use ADC sampling VCC, VCC influenced by GSM, similar to the pic but not the same（about 500mV）. We can't get the GSM work status and HW also could't solve it.

Do you has a soft example to solve this ADC sampling of VCC, the high level is nomal VCC. Thansk!

over 6 years ago

0 Chris Sterzik over 6 years ago

TI__Guru 55096 points

Are you referring to the internal channel connected to VCC?

You can find a software example here and the API needs to be updated as shown below.

ADC14_initModule(ADC_CLOCKSOURCE_MCLK, ADC_PREDIVIDER_1, ADC_DIVIDER_1, ADC_BATTMAP);

Please be aware of the precision around the voltage divider:

Regards,

Chris

0 user5137556 over 6 years ago in reply to Chris Sterzik

Prodigy 40 points

Hi，

We need to test the VCC, in this case do you have a software solution can do it?We din't know the GSM when is working.

0 Chris Sterzik over 6 years ago in reply to user5137556

TI__Guru 55096 points

There are several software solutions found in resource explorer.

dev.ti.com/.../

Please note the ones with 'adc14' in the folder name are solutions with the ADC. If you cannot find an exact match for your application, then please refer to the TRM as well as the driverLib APIs on how to modify the examples to meet your needs.

www.ti.com/.../slau356h.pdf

dev.ti.com/.../

Chris

0 Keith Barkley over 6 years ago in reply to user5137556

Guru 40040 points

What is the actual problem? Do you want to know the Vcc high level and ignore all the dropouts?

0 user5137556 over 6 years ago in reply to Keith Barkley

Prodigy 40 points

Hi，
Yes，you get my point. If you have a key that it is the best. Tks~

0 Keith Barkley over 6 years ago in reply to user5137556

Guru 40040 points

I would try two things: a running average of 64 points or so. If that does not do it, then keep a running average of 64 points and a running standard deviation. Throw away any points that are more than 1 standard deviation away from the mean.

0 user5137556 over 6 years ago in reply to Keith Barkley

Prodigy 40 points

Thanks，~you have give an idea

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MSP432P401R: ADC sampling VCC which is influenced by GSM