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STM32 - discovery : ADC reference Voltage ?

Question asked by Thomas on May 20, 2014
Latest reply on May 20, 2014 by Thomas
Hello,
I am trying to get the reference voltage value with ADC (Channel 18).
On the VCT6 datasheet, it is said that reference calibration values (for VREF) are stored in memory at the address 0x1FFFF7BA. (Value for VREF at VDDA = 3.3V)
When I read the memory, I obtain this value : 0x614 (1556 dec).

How can I deduce the real value of VREF on my board ?
Conversion with ADC at channel 18 gives me this value : 0x6B0 (1712 dec).

Does this mean that my "real" VREF is (3.3 * 0x6AB / 0x614) = 3.6V ?

Thank you !

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