Problem with ADC for 56F8037

[Krtektor]

Hi.
I made an interface for control of electric drives but for sensing current i needed reference volteges Ureflo=1.65V and Urefh=3.3V. However, the ADC doesnt operate correctly for this configuration.  Can anybody help me?

[Deeftepo]

Hi.

I´m need use external reference voltages for de ADC. I´m using CodeWarrior and de EVM, the code generated look fine, but all mesures are 0.

... 

setReg(ADC_CAL,0x3000);  

Thanks. 

[jag]

Hi,

you have to connect the two references at the right pins (for example at Vrefha and Vrefla). Then you have to set the right bits in the CAL register or the ADC.

Please check the 56F8037 datasheet and the 56F803X Peripheral Reference Manual for details.

Hope this helps.

Bye Jack