BQ79656EVM-021: Temperature measurement

Yes, J5 jumper is connected, and I enable the TSREF as well ( WriteReg(0, CONTROL2, 0x01, 1, FRMWRT_STK_W); //to enable the TSREF
waitTime(WAIT_100ms);).

But TSREF is not powering on, it is still giving 0V.

Please help in same.

Hi Abhaya,

TSREF can take 6 seconds to fully enable, put a longer delay. If that doesn't work, please share more of your code. Also does it work with just one device in the stack?

Best regards,

Barry

Hi, I applied 10 s delay, but still, it is not working, 
I'm trying with only one BQ79656 device.

I'm getting the voltage data perfectly.

I've attached the part of code, please check it once.

wakeup_BQ();
    init_ASCLIN_UART();                 /* Initialize the UART module */
    //initMcmcan();                       /* Initialize the CAN module */
    CANInit();
    waitTime(WAIT_35ms);
    AutoAddress(); //auto address sequence
    waitTime(WAIT_1ms);

    //    //RESET ANY COMM FAULT CONDITIONS FROM STARTUP
    //      WriteReg(0, FAULT_RST1, 0xFF, 1, FRMWRT_STK_W); //Reset faults on stacked devices
    //      waitTime(WAIT_1ms);
    //      WriteReg(0, FAULT_RST2, 0xFF, 1, FRMWRT_STK_W); //Reset faults on stacked devices
    //      waitTime(WAIT_1ms);
    //      WriteReg(0, Bridge_FAULT_RST, 0x22, 1, FRMWRT_SGL_W); //Reset FAULT_COMM and FAULT_SYS on bridge device
    //      waitTime(WAIT_1ms);
    //
    //      //ENABLE BQ79616-Q1 MAIN ADC
    //      WriteReg(0, ACTIVE_CELL, 0x0A, 1, FRMWRT_STK_W); //set all cells to active
    //      waitTime(WAIT_1ms);
    //      WriteReg(0, ADC_CTRL1, 0x06, 1, FRMWRT_STK_W);   //continuous run and MAIN_GO
    //      waitTime(WAIT_5us*TOTALBOARDS + 192);                    //5us reclocking per board and 192us for round robin to complete


    WriteReg(0, FAULT_RST2, 0x03, 1, FRMWRT_ALL_W);
    waitTime(WAIT_4ms);
    //delayus(4000); //4ms total required after shutdown to wake transition for AFE settling time, this is for top device only
    WriteReg(0, FAULT_MSK2, 0X40, 1, FRMWRT_ALL_W); //Mask CUST_CRC so config changes don't flag a fault
    waitTime(WAIT_1ms);
    ResetAllFaults(0, FRMWRT_ALL_W);
    waitTime(WAIT_4ms);

    //set up temperature

    WriteReg(0, CONTROL2, 0x01, 1, FRMWRT_STK_W); //to enable the TSREF
    waitTime(TimeConst_10s);
//
//    ReadReg(0, TSREF_HI, Tref, 2, 0, FRMWRT_ALL_R);
//    waitTime(WAIT_2ms);
//    uint16 Tref_T = (Tref[0] << 8) | Tref[1];
//    //    uint16 Tref_T = (Tref[8+4] << 8) | Tref[8+5];
//    printf("\n");
//    printf("%f\t",Tref_T*0.00016954);


    // here abhaya changed 0x41 to 0x09 and enable 2,3,4 GPIO as well//

    WriteReg(0, GPIO_CONF1, 0x09, 1, FRMWRT_STK_W); //-   Configure GPIO1 for temperature measurement
    waitTime(WAIT_2ms);
    WriteReg(0, GPIO_CONF2, 0x09, 1, FRMWRT_STK_W); //-   Configure GPIO2 for temperature measurement
    waitTime(WAIT_2ms);
    WriteReg(0, GPIO_CONF3, 0x09, 1, FRMWRT_STK_W); //-   Configure GPIO3 for temperature measurement
    waitTime(WAIT_2ms);
    WriteReg(0, GPIO_CONF4, 0x09, 1, FRMWRT_STK_W); //-   Configure GPIO4 for temperature measurement
    waitTime(WAIT_2ms);

    WriteReg(0, ADC_CTRL1, 0x06, 1, FRMWRT_STK_W); // - Start Main ADC in continuous run mode
    waitTime(WAIT_2ms);
    // **********************************Setting UVOV and UTOT threshold values*****************************//



    WriteReg(0, OV_THRESH, 0x23, 1, FRMWRT_STK_W);  //    over-voltage Threshold (4.2V)
    waitTime(WAIT_2ms);
    WriteReg(0, UV_THRESH, 0x20, 1, FRMWRT_STK_W);  //    under-voltage Threshold (2.8V)
    waitTime(WAIT_2ms);
    WriteReg(0, OVUV_CTRL, 0x04, 1, FRMWRT_STK_W);  //    Setting OVUV_GO value to 1 for starting the OV UV comparator
    waitTime(WAIT_2ms);

    WriteReg(0, OTUT_CTRL, 0x04, 1, FRMWRT_STK_W); //       Over and under temp control register
    waitTime(WAIT_2ms);
    WriteReg(0, OTUT_THRESH, 0xFF, 1, FRMWRT_STK_W);  //    over and under temp threshold
    waitTime(WAIT_2ms);
    WriteReg(0, OTUT_CTRL, 0x04, 1, FRMWRT_STK_W);  //    Setting OTUT_GO value to 1 for starting the OT UT comparator
    waitTime(WAIT_2ms);

    //set up the main ADC
    WriteReg(0, ACTIVE_CELL, 0x06, 1, FRMWRT_ALL_W);    //set all cells to active (0x0A) // if we want to change the no of cells we will do it here (0x06 for 12 cells).
    waitTime(WAIT_1ms);
    WriteReg(0, ADC_CONF1, 0x02, 1, FRMWRT_ALL_W);      //26Hz LPF_Vcell (38ms average)
    waitTime(WAIT_1ms);
    WriteReg(0, ADC_CTRL1, 0x0E, 1, FRMWRT_ALL_W);      //continuous run, LPF enabled and MAIN_GO
    waitTime(WAIT_35ms+5*TOTALBOARDS);                       //initial delay to allow LPF to average for 38ms (26Hz LPF setting used)


    //set up temperature

//    WriteReg(0, CONTROL2, 0x01, 1, FRMWRT_STK_W); //to enable the TSREF
//    waitTime(WAIT_100ms);

    ReadReg(0, TSREF_HI, Tref, 2, 0, FRMWRT_ALL_R);
    waitTime(WAIT_2ms);
    uint16 Tref_T = (Tref[0] << 8) | Tref[1];
    //    uint16 Tref_T = (Tref[8+4] << 8) | Tref[8+5];
    printf("\n");
    printf("%f\t",Tref_T*0.00016954);

Hi Abhaya,

Try these:

• Try with each of the 4 boards by themselves
• Read back the TSREF bit to see if it's being cleared
• Use the GUI to enable TSREF

Best regards,
Barry