AnsweredAssumed Answered

power supply issue in IMX283.

Question asked by chrisyin on Oct 16, 2012
Latest reply on Oct 31, 2012 by ASIF ALI
Branched to a new discussion

hi, everyone:

I have a power supply issue in IMX283.

 

Steps to Reproduce

 

 

1,use IMX283 in the design refer to<IMX28_EVK_REVD_SCH.DSN
>

 

 

2,conect the 4.2V in battery pin

 

 

3,disconnect the VDD5V pin

 

 

4,push the recovery button

 

 

5,release the recovery button

 

 

Expected Results

 

 

come into pending in step 4

 

 

recovery from pending to work in step 5

 

 

Observed Results

 

 

IMX283 power down
in step 4, the VDDIO droped to 5mV from 3.3V in step 4,

 

 

can't recovery to
work in step 5

 

 

Subject:

 

 

measure the
voltage: 3.3V on VDDIO,3.94V on VDD5V,4.2V on VDD4P2

 

 

I am thinking
that the 3.94V on VDD5V which is higher than VDDIO+0.6V lead to DCDC detected
VDD5V and switched to VDD5V. but the 5V is only drain voltage but not power
supply. so the IMX283 powerdown.

 

 

my question is:

 

 

1,where come from
the 3.94V on VDD5V and 4.2V on VDD4P2, is it right?

 

 

2, whether 3.94V
on VDD5V lead DCDC swich to VDD5V power supply by mistake?

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