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
come into pending in step 4
recovery from pending to work in step 5
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
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?