I got a question from customer.
"we've run into a production anomaly with a digitizer circuit in which we are utilizing the ADS1230 .
Pin 1 -VDD is supposed to be connected to 3.3V and as a result of a layout error it is left un connected .
Nonetheless ,the ADS1230 continues to function correctly at all temperatures (-40 + 80C ) while the voltage at VDD pin 1 is 2.6VDC. It appears that the 3.3V is routed from one of digital inputs via a protection diode to the VDD pin 1, which can explain the 0.7 drop out .
The pin 1 is showing 2.6V which is below the 2.7 threshold in the data sheet .Clearly we're going to correct this mistake ASAP in production, but my question relates to potential reliability issues about field units :
What is the risk for reliability issues ?
Do you see any risk in operating with the ADS1230 in the above scheme ?
is there a long term associated risk with routing the current through the protection diodes , taking into consideration that the current consumption of the digital block is~100uA ?"
Thank you very much for your help.