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We have a voltage reference REF3425IDBVR connected to REFEXT input in ADC ADS131A04IPBS and are trying to make this configuration SIL-capable by increasing fault detection. If the voltage reference fails in runtime, e.g. changes value from 2.5V to 2.4V, the readings form ADC will be incorrect although from MCU perspective it will be correct reading.
Thanks!
Hi JDJ,
the ADS131A04 itself does unfortunately not have any means to monitor the external VREF voltage.
I could think of the following options to detect an external VREF voltage out-of-range condition.
Regards,
Joachim Wuerker
It’s isolated design with no spare ADC channels and no spare time for switching over to internal reference. We are considering a window comparator e.g. TPS3850 when no other possibility.
Please let me know if you have any additional feedback.
Thanks!
Hi JDJ,
I am afraid I don't have any better ideas right now with all those restrictions given.
Regards,
Joachim Wuerker