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ADS1232: Temperature Sensor Usage

Keisuke Suzuki
Prodigy 70 points
Part Number: ADS1232

Hi,

Good day, I hope you are doing well.

I am a user of ADS1232 analog to digital converter chip.

I consider a system with the chip, and I have a question about temperature sensor.

■Temperature Sensor Usage

     I want to use two channels of the chip as "CHANNEL1:gain 128" and "CHANNEL2:gain 1"and make a thermal correction to the data from each channels.

     But  the datasheet says "The temperature sensor function is impossible to use with PGA gain = 64 and 128." (Chap.8.3.2)

     In this case, how I do use this chip's  mode?

<Reference datasheet URL>

https://www.tij.co.jp/lit/ds/symlink/ads1232.pdf?ts=1624323625997&ref_url=https%253A%252F%252Fwww.tij.co.jp%252Fproduct%252Fjp%252FADS1232

Could you please assist us with this matter?

Best regard,

Suzuki

  • 0
    TI__Guru** 112765 points

    Hi Suzuki,

    Welcome to the E2E forum! For the temperature sensor you would use a gain of 1 or gain of 2.  Along with the channel selection you also need to make the gain selection.  You have indicated that for the Channel 1 measurement you desire a gain of 128 and for the Channel 2 measurement you intend to use a gain of 1.  For the temperature measurement you could also use a gain of 1.  For each measurement the device pins would be set as follows:

    Channel 1: TEMP=0, A0=0, GAIN0=1, GAIN1=1

    Channel 2: TEMP=0, A0=1, GAIN0=0, GAIN1=0

    Temperature: TEMP=1, A0= 0 or 1, GAIN0=0 (gain of 1) or 1 (gain of 2), GAIN1=0

    To keep things simple I would use a gain of 1 for the temperature measurement.  Using a gain of 1 you could simply change from the Channel 2 measurement to the temperature measurement by simply setting the TEMP pin high.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Prodigy 70 points

    Hi Bob,

    Thank you for your quick reply.

    I had taken misunderstanding this ADC properties.

    1.We can select "ADC" or "Temperature sensor" data output modes in the case of changing  "TEMP" and "A0" pin's settings.

    2. If we select gain-rate, we change "GAIN0" and "GAIN1"pin's settings.

        (In the case of temperature sensor [GAIN0,GAIN1] = [0,0] or [0,1] )

    To realize our measurement, the following setting is the most simple. 

    *****************

    USE main 2 mode

    [1]Channel 1 

    [2]Channel2 <--change 'TEMP' and 'A0' -->  Temperature 

    **************

    Best regards,

    K. Suzuki