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ADC vref issue

silicon2
Associate II

‎2011-02-28 01:39 AM

Posted on February 28, 2011 at 10:39

ADC vref issue

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4 REPLIES 4
Tesla DeLorean
Guru

‎2011-05-17 05:26 AM

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
Associate II

‎2011-05-17 05:26 AM

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

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Tesla DeLorean
Guru

‎2011-05-17 05:26 AM

Posted on May 17, 2011 at 14:26

The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6Zv&d=%2Fa%2F0X0000000br5%2FnNgYHUBAQJAmyX21RWGGfDue11uJheF_QIijt8bXsek&asPdf=false
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silicon2
Associate II

‎2011-05-17 05:26 AM

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

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