STM32f407 - DAC

[boris239955_stm1_st]

Posted on November 28, 2015 at 19:06

Hello, 

I have a question about voltage reference of DAC on STM32f407. Is it possible to change voltage reference of the internal DAC at 0 to 2.5V.And the second question: is it possible to programming this change with step of 0.1V or I must use external voltage reference.

[Tesla DeLorean]

Posted on November 28, 2015 at 22:03

Pretty sure the answer is no.

The device, as I recall, uses the external +VREF (or VDDA) for the DAC in the same fashion as the ADC. You can bench the ADC against the internal reference, but it is is not 'the reference'

[boris239955_stm1_st]

Posted on November 28, 2015 at 22:14

I want to increase/decrease signal from DAC through TFT button, without using mechanical buttons. Is there a way to do this? 

[Tesla DeLorean]

Posted on November 28, 2015 at 22:40

Ok, so wouldn't you just scale the value you wrote to the DAC's register?

Assuming a 3V VREF, a value between 0-3V in 1/4096 th increments.

[boris239955_stm1_st]

Posted on November 28, 2015 at 22:58

I never thought about this way. I'll try, but I think that is the answer.

Thank you for help.