About battery measurement on GPAIN[2], C5515

Hi William,

Check out the Chip Support Library examples for SAR:

http://software-dl.ti.com/dsps/dsps_public_sw/dsps_swops_houston/C55X/latest/index_FDS.html

See also the C5515 SAR User's Guide: http://www.ti.com/lit/pdf/sprufp1

Hope this helps,
Mark

Hi Mark

I have refered the CSL source code and read the document sprufp1.

Following is the registers configuration.

I don't get the correct Voltage from GPAIN2,  the ADC converted value is alway 0x3FF.

Could you check the above designed circuit and source code, and help me?

Source code is attached.

Thanks a lot

William Zhu

Following is core code.

        case CSL_BATTRY_MEAS:
        {

            *chanNo = CSL_SAR_CHAN_4;
            CSL_FINST (CSL_SAR_REGS->SARCTRL,ANACTRL_SARCTRL_CHSEL,AIN4);
             CSL_FINST (hSar->baseAddr->SARGPOCTRL,ANACTRL_SARGPOCTRL_GPO2EN,
                CLEAR);
            /* Input the VIn voltage without dividing by 2 */
            CSL_FINST (hSar->baseAddr->SARPINCTRL,ANACTRL_SARPINCTRL_HALF, CLEAR);

            /* Reference voltage is based on bandgap voltage */
            CSL_FINST (hSar->baseAddr->SARPINCTRL,ANACTRL_SARPINCTRL_REFAVDDSEL,
                CLEAR);
            status = CSL_SOK;            
            break;
        }8546.SAR_source.rar

hello

Is there anybody can answer my above question?   It's urgent for me.

Thanks

William Zhu

Hi,

Check out the SAR examples in the new C55XCSL-C5517-AUXPACK: http://www.ti.com/tool/sprc133

Hope this helps,
Mark