各位专家:
我在LT1963AES8-3.3使用时遇到如下问题:目的是通过STM32L475 MCU的I/O口(PSW_1)控制LT1963AES8-3.3的SHUT 管脚来控制LT1963AES8-3.3的输出。PSW_1配置为开漏输出,内部无上拉,外部接1M的上拉电阻。当PSW_1 为1时,LT1963AES8-3.3输出3.3V ,正常。当PSW_1 为0时,LT1963AES8-3.3输出不是0V,而是1.4V,找不到原因。
:

What is the voltage on SHDN pin?
0.0119V
Can you disconnect the load from LT1963? When PSW_1 is 0, are there any other circuits running in the system to make the output of LT1963 pulled to 1.4V?
Can you disconnect the load from LT1963? When PSW_1 is 0, are there any other circuits running in the system to make the output of LT1963 pulled to 1.4V?