AnsweredAssumed Answered

MC34708 : VSRTC not powerd by the coin cell

Question asked by johan malfait on Jun 11, 2014
Latest reply on Jun 12, 2014 by igorpadykov

Hi all,

on one of our boards we are using the iMX537 which is powerd by the PMIC MC34708, on the PMIC there is a 3V coin cell connected.

Until now we produced approximately 1000 unit without any problem.

With the last batch (250 pieces) there are 12 boards with the following failure :

When the power is applied : VSRTC = 1.3V --> OK

When the power is removed : VSRTC drops down to 0V.

So the connected 3V coin cell doesn't take over to feed the VSRTC supply.

We have replaced the PMIC on 3 boards and the problem is solved, so it looks like the PMIC chips are bad....

Has anybody experienced the same problem ?

Could there be an other reason for that behavior ?

 

Thanks for the respons

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