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SN65HVD75: Application issues.

Expert 1650 points
Part Number: SN65HVD75

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.

  • Hi Reed,

    I don't see any issues with the schematic.

    How many boards/units were damaged?

    Are there any other high voltage lines near the connector or on the board?

    The problem was not reproduced when the B end was connected to 24V and the A end was connected to GND.

    For future reference, this device's absolute max rating on the A/B pins is 16.5V so adding 24V directly to it can break the device. We do not recommend putting the device under this level of stress outside of the abs max.

    With this level of information, it's difficult to determine a root cause.

    -Bobby