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UCD7242: UCD7242 + UCD9222 can not power up when below -10℃

Part Number: UCD7242
Other Parts Discussed in Thread: UCD9222


 We use the UCD7242+UCD9222 in my board. it works well in the normal temperature. when the temperature below -10℃,

some boards can  power up,but,another can no power up. The case is very strange.

Now , we hase two way to fix the program,but we do not understand th reason.

the first way , when we meet the program , we exchange the UCD7242 may fix it.

the second way, when we meet the program , we extend the reset  time of the UCD9222 to 1s, In the datasheet, the reset  time of the UCD9222 just need 2us.

Can you give some idear the help us to  settle the promgram  completely.


Best Regard:

Gram Lin