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Vrefint _Cal on stm32f103

sadeghie_milad
Associate
Posted on July 12, 2016 at 11:42

Hi 

I faced with a problem for read the Vrefint_Cal in stm32f103

I dont find  Its address  in flash,I read  datasheet and also I searched in the internet but I cant find it

can you help me for sovling this problem???

thank you very much   
4 REPLIES 4
Amel NASRI
ST Employee
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-

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

sadeghie_milad
Associate
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.

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