iCoupler clamp current

I am planning to use the ADUM140E to convert 3.3V GPIO from an FPGA to 5V to interface with digital I/O on a servo drive. The servo drive DIO are active low and use opto-isolators with 50mA max drive. I have a couple of questions about the iCoupler:

  • What is the maximum output drive, source and sink?
  • Are the outputs internally current limited? For instance, if someone accidentally shorts an output pin to 5V while the output is ON, would the part get damaged?

Is there a better iCoupler part to use for this type of application? I don't really need the 150Mbps throughput of the ADUM140E series; my outputs are pretty much DC GPIO.

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  • Brian

    Thanks for your response. I meant to say ADUM4121 instead of ADUM1421.

    The opto-isolators in the drive provide isolation between the drive's internal high voltage electronics and the low voltage (5V) digital interface to my micro-controller. My micro-controller runs on 3.3V logic, and I wanted to also isolate it from the drive's circuits just to be safe.

    I like your suggestions to use something like the ADG1611 switch; it would allow me to use the same components for inputs and outputs, and it meets my output drive requirements. I can use a series resistor to current limit the switches that drive outputs. If you can refer me to someone I can talk to about your analog switches, that would be great!

    Regards,

    Kiy

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  • Brian

    Thanks for your response. I meant to say ADUM4121 instead of ADUM1421.

    The opto-isolators in the drive provide isolation between the drive's internal high voltage electronics and the low voltage (5V) digital interface to my micro-controller. My micro-controller runs on 3.3V logic, and I wanted to also isolate it from the drive's circuits just to be safe.

    I like your suggestions to use something like the ADG1611 switch; it would allow me to use the same components for inputs and outputs, and it meets my output drive requirements. I can use a series resistor to current limit the switches that drive outputs. If you can refer me to someone I can talk to about your analog switches, that would be great!

    Regards,

    Kiy

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