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RStra
RStra
Associate III
May 4, 2020
Solved

STM32L433 VREFINT_CAL Value

  • May 4, 2020
  • 2 replies
  • 2171 views

Hello,

I'm trying to work with the ADC of the STM32L433 microcontroller. The Reference manual (RM0394) on page 448 it says :

The following formula gives the actual VDDA voltage supplying the device:

VDDA = 3.0 V x VREFINT_CAL / VREFINT_DATA

Where can I found the VREFINT_CAL value, I'm not able to find the address on the RM ?

Thank you

Riccardo

Best answer by TDK

It's in the datasheet. Note that it's called VREFINT here instead of VREFINT_CAL.

0693W000000Wr32QAC.png

2 replies

TDK
TDKAnswer
Super User
May 4, 2020

It's in the datasheet. Note that it's called VREFINT here instead of VREFINT_CAL.

0693W000000Wr32QAC.png

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PR.10
PR.10
Associate III
February 29, 2024

I was confused by naming mismatch too :thinking_face:. For people from future, there are actually a built in macros for that which do have matching names. So the code can stay correct when you change mcu variant. in *adc.h

 

 

/* ADC internal channels related definitions */
/* Internal voltage reference VrefInt */
#define VREFINT_CAL_ADDR ((uint16_t*) (0x1FFF75AAUL)) /* Internal voltage reference, address of
 parameter VREFINT_CAL: VrefInt ADC raw data acquired at temperature 30 DegC
 (tolerance: +-5 DegC), Vref+ = 3.0 V (tolerance: +-10 mV). */
#define VREFINT_CAL_VREF ( 3000UL) /* Analog voltage reference (Vref+) value
 with which VrefInt has been calibrated in production
 (tolerance: +-10 mV) (unit: mV). */

 

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