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CAN X-Ceiver: High-level output current

Johannes Hofmann
Intellectual 270 points
Other Parts Discussed in Thread: SN65HVD234

Hello
In the datasheet of the SN65HVD234 at page 3 the "High-level output currents" are given as negative values. For the low level side it's positive.

I don't understand the algebraic signs. For my comprehension it would be the other way round.

Please enlighten me! :)

Thank you

  • 0
    TI__Mastermind 21336 points

    Hi Johannes,

    I agree, the sign of the two parameters is confusing. If you look at page 8 and page 9 of the datasheet, you can see how they draw the current flow in the diagrams. For the driver IO is pointing into the driver. So if the voltage you are connecting to the pin is lower, than current will flow in the opposite direction. Hence the negative sign.

    Again on page 9, the current is drawn in Figure 5 as going into the R pin. Therefore, if the voltage on the pin is lower than the output voltage the current will flow in the opposite direction again, and hence the negative sign.

    Don't let the sign alarm you, you can just treat it as the magnitude of this current or the absolute value.

    Sorry for the confusion. I am not sure where this sign convention came from.

    Thanks,

    John