SN65HVS881: Application question

JoFu10

Part Number: SN65HVS881
Other Parts Discussed in Thread: MUX508, DRV8804

Is it possible to connect these two pins (one input, one output) to the same node? Customer has run out of GPIO pins and needs to combine. He can set the pin as Input or output.

over 8 years ago

0 Adam Torma over 8 years ago

TI__Mastermind 45680 points

JoFu,

As long as the voltage and current are within the recommended operating conditions of the IP0 pin of the SN65HVS881 I don't see why you couldn't share a bus. Have you thought about using an I/O expander TCA4708 or a signal switch MUX508 since you have run out of GPIO?

Thank you,

Adam

0 Rick Duncan over 8 years ago in reply to Adam Torma

TI__Guru** 114905 points

Hi JoFu,

Is there anything else connected to the IP0/OUT4 net to provide 34V?

The DRV8804 is an open drain output and will create a low impedance path (<1 Ohm) to GND when activated.

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SN65HVS881: Application question