STM32F303 Vbat battery voltage monitoring

[Heidi Holmes]

Posted on January 12, 2017 at 06:57

I saw the below statement in the

http://www.st.com/content/ccc/resource/technical/document/datasheet/f2/1f/e1/41/ef/59/4d/50/DM00058181.pdf/files/DM00058181.pdf/jcr:content/translations/en.DM00058181.pdf

and if it means what it says, that I can measure battery voltage, then how do I get this MCU to read my battery voltage? Are there extra components I need to get this to work, how would I hook this up, if no extra components requires, is this all through software, where are the codes, is there an example of schematic and/or code somewhere? I have yet to come across details of how to actually measure battery voltage using this embedded feature so if there is documentation somewhere that I missed, please let me know. Thanks.

3.13.3 VBAT battery voltage monitoring

This embedded hardware feature allows the application to measure the VBAT battery voltage using the internal ADC channel ADC1_IN17. As the VBAT voltage may be higher than VDDA, and thus outside the ADC input range, the VBAT pin is internally connected to a bridge divider by 2. As a consequence, the converted digital value is half the VBAT voltage.

#vbat-monitoring #stm32f3

[Imen.D]

Posted on January 12, 2017 at 08:53

Hello

Holmes.Heidi

‌,

Usingthe VBATEN bit in the ADC12_CCR register to switch to the battery voltage. You can reviewthe reference manual

http://www.st.com/content/ccc/resource/technical/document/reference_manual/4a/19/6e/18/9d/92/43/32/DM000435pdf/files/DM000435pdf/jcr:content/translations/en.DM000435pdf

for more details about Vbat monitoring.

Regards

Imen