STM32F373 SADC how to get 0-3.3V 16 bit(65535)?

[MehmetKaya]

Hello Friends,

I use STM32F373 for 16-bit SADC.

I have single-ended input 0V to 3.3V. VREFSD+=3.3V and VREFSD- =0V

When input Voltage change from 0V to 3.3V I get values 0 to 32767. Is it not possible to get 16-bit (65535) data?

Always signed?

my configuration;

ConfParamStruct.InputMode = SDADC_INPUT_MODE_SE_OFFSET;
ConfParamStruct.Gain = SDADC_GAIN_1_2;
ConfParamStruct.CommonMode = SDADC_COMMON_MODE_VSSA;

Thanks a lot.

[AScha.3]

Hi,

ADC is unsigned - always. (0...Vref = max.)

And on F373 ADC is 12bit - so how you get 16 bits data : read 16 times  and add ?

[MehmetKaya]

Hi Friend, STM32F373 has 12-bit ADC and has SADC which is 16-bit.

[AScha.3]

Hi,

ok, right. So on SADC ...

try setting : without offset , gain = 1 .

+

ADC is unsigned - always. (0...Vref = max.) (without offset setting).

[MehmetKaya]

When I do gain=1;

I get max:32765 at 1.65V.

[TDK]

 

> SDADC_INPUT_MODE_SE_OFFSET

With this, values will always be 0 to 32767.

 

You want single ended zero reference mode instead. Not offset.

The output will still be signed, but the full range of 65535 values will be present.

 

[MehmetKaya]

Thank you very much. it worked.