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Rx Disable OF SN65HVD62

Jayden Park
Expert 1100 points

Other Parts Discussed in Thread: SN65HVD62, SN74LVC1G125

Hi!

Out customer wil use SN65HVD62(AISG On-Off Keying Transceiver).

But Our customer have special function.

That is RX disable function.

If see datasheet, it mentioned Standby Mode[DIRSET1/DIRSET2=H,H].

But, In standy mode, When Rx signal is input, device is wake-up.

Do you have solution in this device???

Please reply to me as soon as possible.

  • 0
    TI__Mastermind 20600 points

    You are correct there is not a receive disable mode built into the device. 

    Standby mode leaves the receive path functioning and disables the transmit path.  When not in standby the device will nominally be in IDLE and is looking for either receive or transmit.  Once one of those events occurs the device switches to that state for the DIR timeout. 

    You could use simple external logic to create this additional state.  One option is a buffer gate with enable such as SN74LVC1G125 where the output can be disabled via the nOE signal, using a pull up on the Y output would keep the receiver output "high".  Another option is using an AND gate to create the receive disable assuming you can live with the receiver output being low output when disabled. 

    Would either of these work?  I'll check with the team for additional options anyone can think of.

    -- Scott