MP4245GVE-0000 上电无输出 VCC=0V

MP4245GVE-0000 VIN=12M EN=2.1V 上电后 没有I2C 发送命令情况下,VCC 有5.0V 电压吗? 另外 在输入VIN=4.5V EN=2.1V 时 VCC 电压是多少

MP4245GVE-0000 VIN=12V EN=2.1V时,有VCC电压,大概5.25V。如果此时VCC电压没有,可以检查焊接/原理图PCB是否接错/芯片来源。

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Datasheet P19 :
Start-Up Timing for USB PD Applications
If the EN pin is high, the MP4245 powers up
VCC, but the default I2C operation bit
(OPERATION) is set to off for the MP4245-0000.
When a sink device is plugged in, the PD
controller sends the I2C a command to set
OPERATION to on.
这段话该怎么理解: 是指 Vcc off 还是 Vout off

OPERATION寄存器控制的是Vout,MP4245-0000的默认是通过OPERATION关闭了Vout,需要对OPERATION写入指令打开输出