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TRS3232E-Q1: short to Battery

SUN xuran
Prodigy 40 points
Part Number: TRS3232E-Q1
Other Parts Discussed in Thread: SN65HVD1780-Q1

Tool/software:

As described in the specification, the maximum withstand voltage of the Dout pin is ±13.2V, but the short circuit to power supply test of the car requires a short circuit to 14V. Will this cause damage to the chip? If a TVS with a clamping voltage below 13.2V is selected, the TVS may be directly burned out when short-circuited to the power supply. So how should I choose a protective device?

  • 0
    Guru 317480 points

    As far as I know, there is no RS-232 driver that can withstand a DC voltage of more than 13.2 V.

    Are you really required to use RS-232? If not, consider RS-485 with a transceiver like the SN65HVD1780-Q1.

  • 0
    TI__Guru 74541 points

    Hi Sun,

    As Clemens stated all of our RS232 devices have a max voltage of 13.2V. 

    You probably need to move to a different communication protocol that has a more robust absolute max voltage like RS485 or CAN.

    -Bobby