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Analog output on SN65HVD10x IO-Link transceiver

Anjali Shelke
Prodigy 30 points
Other Parts Discussed in Thread: DAC8750

Hi, As you know IO-Link technology is used in switch/ sensor where analog output is also required so is it possible to have analog output on the same transceiver chip?

  • 0
    TI__Guru 62910 points
    Hi Anjali,

    I've mostly seen IO-Link used in sensors that are designed to have a single digital output. Can you please explain a little more on the need for analog output support? Would you want to be able to just have the analog and digital circuits sharing the same cable connections, or are you looking for a single IC that would be able to integrate both analog and digital functions? What kind of circuitry is needed for the analog output - 4-20 mA drivers, DACs, etc.? Something like a system block diagram would be very helpful if you could provide it.

    Best regards,
    Max
  • 0 in reply to Max Robertson
    Prodigy 30 points

    Hi Max,

    Thanks for your answer.

    You are right IO-Link specification does not talk about analog outputs on connector pins. But most of the switches/ sensors available in market are provided with analog output on the other pin like this,

    So to provide this analog output we need to have separate DAC IC (may be TI - DAC8750) or MCU with in built DAC and some discrete components. 

    If we've a single chip solution with switching output OR IO-Link(this is already there in SN65HVD10x) and one more switching output OR 4-20mA analog output, then it will be best option to design such kind of sensor with minimum components because these sensors are small in size so PCB size should be small. As of now there is no such IC available in market but if it is available then it will be easy for development.  

      

  • 0 in reply to Anjali Shelke
    TI__Guru 62910 points
    Anjali,

    Thanks for the feedback! We don't have such a device in our immediate plans, but this will be interesting for us to consider as we try to develop more optimized solutions for small sensors. I've forwarded this to our team working on new product definition.

    Max
  • 0 in reply to Max Robertson
    Prodigy 30 points

    Hi,

    What are the thoughts of your team regarding single chip solution.

    One more thing Can we develop Micro controller to IO-Link level signal without transceiver? Is it possible to design this transceiver using discrete components?

    Thanks,  

  • 0 in reply to Anjali Shelke
    TI__Guru 62910 points
    Anjali,

    We think it is a good idea, but it would be a while before we would get to something like that since our development plans are firm for the next couple years with high-priority projects. If you want to send me a note at m<hyphen>robertson@ti.com I could give you a little more info on our development plans after processing an NDA.

    I think a discrete implementation for an IO-Link transceiver would be difficult and would likely be inferior to an integrated solution. The high-voltage switching on the output could be implemented through FETs (one for high-side switching and one for low-side switching), and a receive function could be implemented with a comparator, but other features like input and output current limiting, wake detection, transient protection, thermal monitoring, etc. would be complex to implement.

    Best regards,
    Max