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LDC1312-Q1: Coil PCB issue

Part Number: LDC1312-Q1
Other Parts Discussed in Thread: LDC1312


I am using LDC 1312 in one of our position sensor.

i got coil PCB designed from TI tool.

Position is sensed and analog output is given as a representation of position.

One failure observed from field where at elevated temperature (at ~60deg C) output changes from 2.5V to 4.5V even when position remains the same ,.

After replacing the coil PCB, the part is working OK up to 120 deg C

I checked the inductance resistance of both i.e NOK and OK coil PCB and found to be as

Series Inductance of NOK coil PCB(checked on LCR meter 1KHZ) : 14.4uH

Series Inductance of OK coil PCB(checked on LCR meter 1KHZ) : 15uH

DC resistance of NOK coil PCB :7.3R

DC resistance of OK coil PCB : 7.8R.

Please support to find root cause of the issue ?

What can be wrong the NOK coil PCB?