Tool/software:
Hi Team,
Using SN65HVD75DGKR,
The schematic diagram is shown in the following figure,
1. 2, 3, and 4 pins are directly connected to the MCU, while pins 6 and 7 (A and B) communicate with the outside through a connector. At the same time, 5 SN65HVD75DGKR chips are connected in a daisy chain with pins A and B. In actual use, the connector only connects wires A and B, resulting in chip burnout and pin 7 burnout.
After experimentation, the problem was not reproduced after multiple hot plugging and unplugging attempts; The problem was not reproduced when the B end was connected to 24V and the A end was connected to GND. The cause of the chip burn was not found, and we now hope to help diagnose the cause of the burn.