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ADS131E04: ADS131E04 Wrong conversion value

Eduardo Sabbatini
Prodigy 10 points
Part Number: ADS131E04

Good afternoon everyone,

I am needing help regarding this IC, even though it is mainly for power measuremenet i want to read 4 load cells simultaneously. 

The load cells are connected to 5V, they have a sensitivity of 2mv/V so at 5V it would give a 10mV. 

ADS131E04 VREFP and VREFN are connected to 5V and AVSS respectively.

Eveything works fine, communication is fine, read and write register is also fine. 

The issue is that i always get values around 0xFFFA00 even short circuiting any differential input pair (for example channel 0 IN0P and IN0N). Doing so, i should be getting a reading of around 0 but i get also 0xFFFA00 +- 10 (always moving but in +-10 counts)

What could be the issue? this thing is driving me crazy...

Best regards

Eduardo

  • 0
    TI__Mastermind 37791 points

    Hi Eduardo Sabbatini,

    Keep in mind that the E08 has a binary coding scheme, as shown in the image below. Therefore, the value FFFA00 is actually a very small negative number, which would make sense when you are shorting the inputs together. This would represent a small negative offset. The actual value would depend on the gain you are using

    What gain and data rate are you using?

    Can you send logic analyzer data showing the data transaction when you try to read data?

    -Bryan