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ISO1212: Questions for Datasheet Clarification

Darren (FAE)
Expert 5483 points
Part Number: ISO1212

I need some help understanding the behavior shown in Figure 29 (sourcing/sinking inputs).
The diagram seems to show an AC input waveform, but is it safe to assume the same configuration works for DC as well?

Also, from the ABS MAX values in Section 7.1 of the datasheet I see VINx / VSENSEx is ±60V.
From this I understand using the reverse-connections shown in Figure 29 are safe.

I understand then the SENSE pin can see current flow in both directions.
Are there any key concerns here to be aware of?

  • 0
    TI__Expert 8030 points

    Hi Darren,

    Thanks for reaching out.

    Darren (FAE) said:
    I need some help understanding the behavior shown in Figure 29 (sourcing/sinking inputs).
    The diagram seems to show an AC input waveform, but is it safe to assume the same configuration works for DC as well?

    The device is designed to accept a DC voltage and Figure 29 shows a method that allows the device to be used with an AC voltage. If the configuration in Figure 29 is used with a DC voltage, the circuit will not function as expected, because only one of the outputs (OUT1 or OUT2) will ever go high. Hence, if really want to use this device with a DC voltage, you should use the diagram in either Figure 28 or Figure 16 (depending on if you are using either sinking or source inputs).

    Darren (FAE) said:
    Also, from the ABS MAX values in Section 7.1 of the datasheet I see VINx / VSENSEx is ±60V.
    From this I understand using the reverse-connections shown in Figure 29 are safe.

    Your understanding is correct. The device is capable of withstanding both positive and negative voltages in the range specified by the datasheet.

    Darren (FAE) said:
    I understand then the SENSE pin can see current flow in both directions.

    Current will only flow through the device when a positive voltage is applied. When a negative voltage is applied, no current will be passed through the device. This is a result of the reverse polarity protection diode within the device, which is shown in the functional block diagram (Section 8.2). 

    Darren (FAE) said:
    Are there any key concerns here to be aware of?

    As long as the device is operated within the conditions specified by the datasheet, it should perform as expected.

    Regards,

    Kenneth