AD5933 and RENESAS microcontroller are connected by I2C communication.
Both SDA and SCL are connected with 10KΩ pull-up resistors, and bypass capacitors are not attached.
In the evaluation test, when the both ends of the pull-up resistor connected to SDA were briefly shorted with tweezers to make the communication data abnormal, communication with the AD5933 became impossible even after the tweezers were released. I was.
Even if the initial command is sent from the RENESAS microcomputer, communication does not recover.
If only AD5933 is turned off and then turned on, communication returns to normal.
At this time, the power of the RENESAS microcomputer remains ON.
I would like to know what could be the cause.