imx6qplus can't work at 0 centigrade

[gaoweilin]

I choosed IMX6DQPAEC  in my design and it work well at normal temperature,but when the air temperature falled to 0 centigrade，the board failed  to boot，the debug uart has no message when the power is on.I measured all regulator outputs of PMIC, found that the vgen4_3v0 which connected to VDDHIGH_IN dropped to about 0.96 V,but  acturally it should be 3V according to datasheet.Who can tell me why?

[igorpadykov]

Hi gaoweilin 

if this is just one board this may be quality issue: poor soldering,

thermal deformations or esd failures. If many boards, then it makes sense

to check carefully schematic and measure vgen4_3v0 current during thermal tests,

use checking points given in i.MX6 System Development User’s Guide

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf

Best regards
igor
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