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ADS1298 Configuration problems

DSP_KungFu_Master
Intellectual 705 points
Other Parts Discussed in Thread: ADS1298

Hello,

I have ADS1298 running inside our product, all signals are acquired perfectly using the following configuration:

- High resolution mode, 4kSPS (Config1 byte: 0x83)

Now we wan't to switch to low-power mode (16 bit). Anything except the following configuration is not working:

- Low resolution mode 4kSPS (Config1 byte: 0x02)

I tried setting other resolutions 250 (0x06) , 500 (0x05), 1000 SPS(0x04)  but the DSP is not respoding, it doesn't trigger the interrupt anymore and I'm not receiving any data from it? The only way I'm getting data is when I set it to 4kSPS. 

 

Am I making some mistake in the configuration?

 

Thank you...

  • 0
    TI__Guru**** 180751 points
    Hello Srdjan,
    I appreciate the feedback you provided on the datasheet.  We missed that typo.
     
    The ADS1298 is a 24-bit part.  Low Power mode does not place the part in a "16-bit" mode.  Low power mode runs the modulator at half the rate only.
    Are you changing the SPI interface thinking you are talking to a 16-bit part?  Is this causing the problem? 
     
    Regards,
    Lijoy
  • 0 in reply to Tom Hendrick
    Intellectual 705 points

    No, everything is the same, I'm not making any changes in the SPI interface.

    When I run the device in the normal mode it goes down to 500 SPS but when I set it to "low power mode" the lowest sample rate is 4000 sps. I just change one bit in the config1 register. Can this be somehow connected to the clock rate? We are using internal clock of the ADC.

     

    Thanks..