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SN65HVD230： R-pin output voltage vs output current

Takehiro Sato
Intellectual 2235 points
Part Number: SN65HVD230

Hello Team,

My customer is considering the SN65HVD230 CAN transceiver, however there has issue data receive MCU I/O port threshold is mismatch for VIH/VIL.
In the datasheet, the R-pin VOH/VOL is 2.4Vmin /0.4Vmax at 8mA source/sink current.

Does the output voltage of the R pin increase the VOH with more lower output current? 

If the output voltage of the R terminal vs the output current graph is present, it would be helpful to provide it.

Best regards,

Sato

  • 0
    TI__Mastermind 48215 points

    Hi Sato-san,

    Yes, the output voltage of the digital pins will be closer to nominal values (Vcc and GND) when less current is drawn. The relationship here is roughly linear, so we can extrapolate without a graph. 

    For the low-level output, the specification shows that while sinking 8mA to GND, our output voltage is 0.4V maximum. This implies an Rds(on) of 50-ohms max. Using this value, we can estimate the output voltage at any lower current need. Will this be sufficient for the customer's calculations?

    Note that the estimations for Voh are based on the minimum recommended Vcc of 3.0V, so the voltage drop to 2.4V will only be 0.6V. 

    Let me know if you have any more questions.

    Regards,
    Eric Schott