2023-11-30 01:24 AM - last edited on 2023-11-30 01:41 AM by Mike_ST
Hello all. I am working with internal ADC can I know what is the internal reference voltage and how to change the internal reference voltage?
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2023-11-30 02:34 AM
You can find this information in the STM32F429ZI data sheet, section 6.3.24:
VREFINT (Internal reference voltage) = min 1.18V, typ 1.21V, max 1.24V
You cannot change it, but you could apply an external reference voltage to VREF+ (pin 32) if you first desolder R58, which connects VREF+ to VDD.
Hope that helps?
Regards
/Peter
2023-11-30 02:34 AM
You can find this information in the STM32F429ZI data sheet, section 6.3.24:
VREFINT (Internal reference voltage) = min 1.18V, typ 1.21V, max 1.24V
You cannot change it, but you could apply an external reference voltage to VREF+ (pin 32) if you first desolder R58, which connects VREF+ to VDD.
Hope that helps?
Regards
/Peter
2023-11-30 09:56 PM
Thank you ...but there is an option to change VDD in cubemx tried it but the result looks the same.
2023-11-30 10:18 PM
> but there is an option to change VDD in cubemx
Where exactly?
JW
2023-12-01 12:09 AM
> but there is an option to change VDD in cubemx
Do you mean VDD in the RCC, System Parameters block?
This has no effect on a reference voltage, but on a #define VDD_VALUE, for example, which can be used for ratiometric measurements, among other things. A reference voltage is generally independent of the supply voltage - otherwise it would not be a reference, would it?