MSP430FR6922: EMC immunity of the ADC signal - connecting AVss, AVcc pins

Bart

Part Number: MSP430FR6922

Dear Team,

Can you share some guidelines how the AVss, AVcc pins should be connected if EMC immunity is a priority?

Is the AVss for LFXT crystal as well?

Which 3 pins should be used to supply voltage divider (resistor + thermistor) that customer wants to measure by ADC? - Is there any pin, which was supplied by AVcc?

Thank you for your help.

over 5 years ago

0 Peter Spevak over 5 years ago

TI__Genius 17960 points

Dear Bartosz,
the main aspect in regards of EMC immunity is a proper layout design. Please find more details on this in the application report www.ti.com/.../slaa530.pdf
The 32kHz crystal GND should be connected to the AVss. Please find further details again in the above application report. You can find further details on the crystal specific topics in another application report www.ti.com/.../slaa322d.pdf
All the GPIOs are supplied from the digital power domain. Are you aware the possibility to measure the device temperature with the integrated temperature sensor? Would that be an option, instead of the external thermistor?

Best regards
Peter

0 Peter Spevak over 5 years ago in reply to Peter Spevak

TI__Genius 17960 points

Dear Bartosz,
do you have any further questions related to this topic? If not please confirm the resolution of this thread. Many thanks in advance.

Best regards
Peter

0 Bart over 5 years ago in reply to Peter Spevak

TI__Expert 6310 points

Hi Peter,
it helped, thanks!
Bartosz

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MSP430FR6922: EMC immunity of the ADC signal - connecting AVss, AVcc pins