Vrefint _Cal on stm32f103

Posted on July 12, 2016 at 16:27

Hi poursadeghi.milad,

VREFINT_CAL is defined for STM32F0 and STM32F3, but not for STM32F1 (and STM32F4...).

What do you need to do exactly?

-Mayla-

Posted on July 12, 2016 at 16:58

Hi,

The STM32F1 does not have calibration values.

You can refer to this

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Vrefint%20and%20Temperature%20Calib%20values%20on%20STM32F1057&FolderCTID&currentviews=457

.

Regards

Posted on July 13, 2016 at 07:21

Hi

I use Stm32f103 64 pin, the Vref for this microcontroler connect internally to VADC

VADC in my board has tolerance in difference times

I need calibrate my vref with use the Vrefint

in block diagram in datasheet there is a Vrefint , datasheet says you can read this voltage in channel 17 also the datasheet  is not given the value of Vrefint

I want know what is usage the Vrefint that comes in datasheet

and I know how can I do calibrate my vref????

Regards

Posted on July 13, 2016 at 13:52

The data sheet also says Vrefint should be 1.20V

You'd sample this, get a value and then extrapolate that for a 4095 value, which would reflect the VREF being used. Simple math, right?

VREF = (1.20 / (double)VrefintSample) * 4095.0;

You'd then use this VREF value when doing your other ADC conversions.