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BQ27Z561: 无法烧写日期

Part Number: BQ27Z561

不良现象:组装成成品对产品写日期数据,校验时报错,日期为IC出厂原始数据:2021-07-14,不良频繁发生,不良率2-3%。

分析:对不良品用TI官方软件写日期时,报进入写保护模式,无法写日期,可以读取其他信息

验证:对产品进行8.6A放电过流后,TI软件及测试程序可以写日期,校验合格

初步结论:测试时触发TI IC写保护模式

希望得到贵司的协助,咨询如下:

1.通过什么指令可以恢复写保护模式;

 2.怎么预防TI IC被触发写保护模式。

程序读写信息

local FixeValue = {"BE","40","00","00"}
FixStr = table.concat( FixeValue, "", 1, 4 )
WriteBytes("AA","3E",Read)
Sleep(2 * _ShortDelay)
WriteWord("AA","60",Convert,"22")
Sleep(2 * _ShortDelay)
WriteBytes_string("AA","3E",FixStr)
Sleep(2 * _ShortDelay)
WriteWord("AA","60","01","06")
Sleep(2 * _ShortDelay)
WriteWord("AA","3E","A0","40")
Sleep(2 * _ShortDelay)
Rec = ReadBytes("AA","3E",32)