MPQ2022问题咨询

汽车解决方案
#1

问下MPQ2022在 Short-to-battery解除后，输出恢复正常后，寄存器ERR_FLAG_1 D[0]和D[1]里面的记录会保存吗？还是谁寄存器里数值是实时变化的，解除后立即变为0？还是说会保存起来？
如果不使用FT引脚，通过IIC检测Short-to-battery必须实时读取吗？

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我看手册里写的如下；
A 15ms blank time is asserted each time the device is enabled when both VIN and EN exceed
their rising threshold or recover from the thermal shutdown or hiccup. The short-to-battery
detection occurs during this 15ms blank time. If the device detects the short-to-battery fault, both
dual LDO switches are latched off or hiccup (based on Reg0x04 D[0] bit set), the /FT pin is
asserted low, and the dedicated bits in the register are set to indicate fault-channel。

在短接到Battery后会进入hiccup模式（软件已经配置寄存器Reg0x04D[0]为1）；实际测试短接到Battery后电流还是持续300mA输出，请说明下是哪里设置不对吗

#2

你好，short to battery解除输出恢复正常后，故障寄存器会恢复成0，如果通过I2C需要定期读取对应故障寄存器的状态。
可以确认下是先短电池再上电，还是在上电工作后再做的短电池操作？

#3

是上电工作后1s再做的短电池操作。

#4

A 15ms blank time is asserted each time the device is enabled when both VIN and EN exceed their rising threshold or recover from the thermal shutdown or hiccup. The short-to-battery detection occurs during this 15ms blank time.
如截图文字描述，short to battery主要是在开机后的15ms内检测，正常运行的过程中如果需要考虑短电池故障的话，芯片输入侧可以加个二极管防反向电流，芯片引脚耐压本身是OK的，同时可以通过I2C读输出电压；

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