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ADS1232: ads1131 to ads1232

Part Number: ADS1232
Other Parts Discussed in Thread: ADS1131, ADS1231,

Hi there,

I'm thinking of upgrading the pcb by replacing ads1131 with ads1232.

1) Should I worry much about the new source code (except the 24bit difference)? 

2) I'm satisfied from the ads1131 performance. Is there a case to make things worse with the ads1232 ?

2) Should I expect big difference from the offset calibrate feature of ads1232 ?

Regards

  • And also,

    I notice that the PSW (low side power switch) is not present at the ADS1232. Will this mean that I will face power consumption at the bridge excitation ?

  • Hi Theodore,

    It is not clear why you want to switch to the ADS1232.  If you want an increase in resolution you could use a drop in replacement on your current PCB using the ADS1231.

    As to your questions, the code should be very similar.  The only real difference beside the length of conversion result is the offset calibration feature for the ADS1232 that takes place on the 26th SCLK.  Regarding question 2, I'm not sure why you want to switch devices, but the ADS1232 is a slightly better performing part.  As far as the offset calibration feature, this is most useful if your board will see a lot of temperature change.  Offset will change with temperature, and the self offset can help limit the affect of temperature drift.

    Regarding your follow up post, the ADS1232 does not have the low-side switch.  If you look at the ADS1232REF users guide you will see a schematic showing an analog switch in the bridge excitation path that is used to shut off the current.  This switch would have to be controlled by a micro GPIO.

    Best regards,

    Bob B

  • Hi Bob,

    I'm thinking of the ADS1232 so as to be able to handle 2 weight scales.

    Regarding the low-side switch I see an DPDT switch at the 1232 REF pcb. Can you recommend a low-power consumption switch circuit to be controlled by a micro gpio ?

    Best regards,

    Theodore

  • Unless when the ads1232 converter is shut (with the powerdown pin), it also disconnects the bridge excitation.

    Regards,
  • Hi Theodore,

    The ADS1232 does not have a low-side switch option, so you will need to control the bridge excitation separate from the ADS1232.  On the ADS1232REF schematic, shown on page 23 of the user's guide, you will see a switch (U7) that was given as an example for controlling bridge excitation current.  The part number for this switch is TS5A3166DCK, and it is connected to the low-side of the excitation path.

    Best regards,

    Bob B