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CCS/PGA900EVM: problem with current output

JUAN ARAUJO
Prodigy 140 points

Part Number: PGA900EVM

Tool/software: Code Composer Studio

We have the PGA900EVM and XDS200 board. The test codes that do not regulate the current output, the consumption of the board is always high, and even, without the PGA900 in the base, the consumption is more than 600mA, use the TIDA code for RTD sensor, with the function for fixed 4mA output, and the same request, is still a current output above 100mA, the jumper configuration is the one indicated by the user guide for current loop. the test on gpio for blinking state its ok.

  • 0
    Prodigy 140 points

    /* Configure frequency of PGA900 */
    M0_ConfigClock(CLK_4MHZ);
    /* Initialize PGA900 interrupts */
    Interrupt_Reset_Init();
    ADC_Reset_Init();
    DAC_Reset_Init();
    CONFIG_ALPWR(POWER_UP_PT_PGA_FD | ADC_EN_VREF | GATE_CTRL_SD_DISABLE);
    /* Turning on DAC and DAC GAIN as per programmer tips */
    DAC_Config(DAC_ENABLE, DAC_RATIOMETRIC_MODE_DISABLE,
    B_4_20MA_EN | DACCAP_EN);
    AMUX_CONFIG(TSEM_N | TEST_MUX_P_EN | TEST_MUX_T_EN | TEST_MUX_DAC_EN);
    /* Initialize T channel ADC */
    //ADC_Tchannel_Config(ADC_ENABLE|ADC_DECI_RATE_128US|ADC_ENABLE_24BIT|ADC_INT_RATE_EVERY_4_SAMPLE,T_GAIN_20_V_V);

    ADC_Pchannel_Config(ADC_ENABLE|ADC_DECI_RATE_128US|ADC_ENABLE_24BIT|ADC_INT_RATE_EVERY_SAMPLE, 0X1F);
    BRDG_CTRL_CONFIG(VBRDG_CTRL_2_5V|BRDG_EN);//output VBRG
    //TEMP_MUX_CONFIG(ITEMP_CTRL_100UA | VEXTP_VEXTN);
    ADC_Config(ADC_CFG_1_ADC_ENABLE); /* ADC is enabled */

  • 0 in reply to JUAN ARAUJO
    TI__Mastermind 31655 points

    Hello Juan,

    If the current consumption of the EVM is high even without a PGA900 device inserted in the socket, then the configuration of the PGA900 is most likely not the issue. The normal current draw of the EVM including the PGA900 with the DAC disabled should be in the range of 15-25mA or so. Do you have any external components connected to the EVM? I would begin by disconnecting everything and making sure the EVM itself is not damaged and drawing too much current.

    Regards,

  • 0 in reply to Scott Cummins
    Prodigy 140 points

    Hello Scott, thank you very much for answering, I only have the multimeter and the power supply connected, I do not have external elements that can consume current.

    I have this doubt regarding the failure in the EVM, because the consumption was always high, from the first time I turned it on.

  • 0 in reply to JUAN ARAUJO
    TI__Mastermind 31655 points

    Hi Juan,

    As a sanity check, I suggest setting the jumpers to the default configuration described in the user's guide (shown below), disconnecting the USB2ANY, and removing the PGA900 from the EVM socket. Apply 15V to the inputs and see what the current draw is. If it is still in the range of 600mA there is something shorted to ground on the board-- possibly a faulty decoupling capacitor.

    If the current draw is high when the board is in the state described above, it certainly has a faulty component, and I would recommend requesting a replacement from the distributor that you bought the EVM from.

    Regards,

  • 0 in reply to Scott Cummins
    Prodigy 140 points

    Hi Scott, sorry for the delay, do the test you indicated, I exceed 100mA, almost 600mA, U12 had temperature

  • 0 in reply to JUAN ARAUJO
    TI__Mastermind 31655 points

    Hi Juan,

    It does seem like your board is damaged in some way. I recommend requesting a replacement from the distributor that sold you the EVM. Please let me know if you have any issues with this.

    Thank you,