iMX536 NVCC_SRTC Abnormal

[xiaobingtang]

     Hello，I come here for your help！   

    
     It is like this： Use LTC3589-1 as a PMIC For iMX536, connet LDO1 to NVCC_SRTC_1V3. When not Powrn ON, the LDO1 out is 1.3V,after power on,LDO1 changes to 1.8V.when I Cut off the connectiong between NVCC_SRTC_1V3 and LTC3589-1's LDO1,NVCC_SRTC_1V3's voltage is 1.8V,and LDO1's voltage is 1.3V.

     Is there something settings wrong?

     PS: LDO power input VDD_REG is measured as 2.5V.

[DonnyChiu]

Check the following signals in your schematic:

CKIL, ECKIL, PMIC_ON_REQ, PMIC_STBY_REQ.

These signals also use NVCC_SRTC_POW as power source.

Probably, you had one of these signals connected to IC that uses 1.8V level,

and it got leaked to NVCC_SRTC_POW pin.