ADC vref issue

silicon2 · ‎2011-02-28

Posted on February 28, 2011 at 10:39

ADC vref issue

Tesla DeLorean · ‎2011-05-17

Posted on May 17, 2011 at 14:26

Perhaps it would be useful to specify the part you are using and how you have it wired?

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silicon2 · ‎2011-05-17

Posted on May 17, 2011 at 14:26

Hi,

I am using stm32f103 (64 pins - without external Vref ). All supply pins are connected to Vcc and all Gnd pins to gnd. I have 3.3 Vcc.

r,S

Tesla DeLorean · ‎2011-05-17

Posted on May 17, 2011 at 14:26

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Up vote any posts that you find helpful, it shows what's working..

silicon2 · ‎2011-05-17

Posted on May 17, 2011 at 14:26

Hi,

I tested like you did. And I get

VREF value1 1521

VREF value2 1560

VREF value_1_32 1559

I figure out that I have to place this statement

/*! Enable Vrefint on channel 17 */

ADC_TempSensorVrefintCmd(ENABLE);

After ADC_DeInit(ADC1);

Then is no changes if I put upper statement(ADC_Temp) beside

ADC_Cmd(ADC1, ENABLE);

or after calibration.

I check the manual and see that I have to place it beside ADC_Cmd(ADC1, ENABLE);

thank you

r,S