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ADS1147: Internal reference voltage of ADS1147

CHINNAN C V
Prodigy 60 points

Part Number: ADS1147

i'm a beginner .For my project i'm  using ADS1147 (20PIN) . I connected the VREFOUT to VREFCOM with a 10uF capacitor. The REFPO and REFNO is not connected.

  AVDD and DVDD are connected to 3.3V . The DGND and AVSS connected to 0V.  Analog input is connected to AIN0 and AIN1.

The ADC communicated with SPI. The clock ,chip select, DIN and Dataready signal are getting properly.

 But we cannot get the output at DOUT. We get only 0.3mV across VREFOUT and VREFCOM

I doubted the working of internal REFVOLTAGE.

What is the voltage  of  INTERNAL REFVOLTAGE ?

Is there is any enable pin to enable internal REFERENCE VOLTAGE?

 

Thank you

How it troubleshoot ?

  • 0
    TI__Guru** 100335 points
    Chinnan,


    All of the questions you ask are described in the datasheet of the ADS1147:

    www.ti.com/.../sbas453g.pdf

    However as a quick start, you can check these things to debug the device:

    Check:
    Supply voltages
    START is high
    /RESET is high
    VREFCOM should be connected to GND or AVSS
    There should be a 1uF to 47uF capacitor from VREFOUT to VREFCOM

    If the voltage are set correctly, then the device should start converting.

    Then check:
    /DRDY should have narrow pulses every 200ms coming out indicating that the ADC is converting.

    When enabled, the internal reference voltage is 2.048V. It is enabled through the MUX1 register using the VREFCON bits (set them to 01 to turn them on). The default is that the internal reference voltage is off. See page 51 of the datasheet.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Guru** 100335 points
    It appears that this post has been resolved.

    e2e.ti.com/.../777508


    Joseph Wu