Hi,
in an application we use the iMX537 MCU which is powerd by a PMIC MC34708. Until now we produced a 1000 boards without any problem.
With the last batch of boards (250 pieces) we have a problem on 10 boards with the coin cell back up.
There is a 3V coin cell connected to the PMIC.
When the power is applied (BP = 3.8V) VSRTC = 1.3V --> OK
When the power is removed and the cion cell has to take over, VSRTC drops down to 0V.
We have replaced the PMIC on 3 boards and the problem was gone.
That looks like the PMIC is bad, has anybody experience the same problem ?
Could there not be an other reason for that behavior ?
Hi johan
I had not heard about such issues, but think
that this may be caused by technology process:
solder overheating or ESD handling. In general it may
be recommended to send chips for quality analysis
through marketing local office.
Best regards
chip
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