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Original question:

TIOL111: Power consumption & configuration of version without internal LDO

TIOL111: Quiescent Supply Current

Riccardo Villani
Intellectual 1185 points
Part Number: TIOL111

Hi All, 

We are studying a possible solution with TIOL111x IO-Link transceivers with integrated surge protection.

In the datasheet (page 5) the quiescent current is given in the case of enable low and high without load.
It is not said whether that consumption is for all three models or not. Is this still the current in the case in which the model without LDO will be chosen?

Thank you in advance for your support,
Best Regards

RV

  • 0
    TI__Mastermind 33090 points

    Hi RV,

    This is for all three devices but does not include any current that may be sourced out of the VCC_OUT pin on either the TIOL1113 or TIOL1115 devices.  The TIOL111 which is considered the non-LDO option actually does have an internal LDO that is used to power the digital core of the device just like the TIOL1113 and TIOL1115.  If there is a load connected to the VCC_OUT pins, that current will flow through the L+ pin, but this is not included in the quiescent spec which only considers the current consumed by the device itself.

    Regards,

    Jonathan

  • 0 in reply to Jonathan Nerger
    TI__Intellectual 1185 points

    Ok, thank you Jonathan. 

    Just a brief recap: TIOL1113 and TIOL1115 that are the devices with the internal LDO declared, can be used for powering external electronics, right?
    Can I therefore assume that if I choose the one without internal LDO (TIOL111), the device is able to supply itself from L + via its regulator?

    Is that right?
    Thank you

    Riccardo 

  • 0 in reply to Riccardo Villani
    TI__Mastermind 33090 points

    Hi Riccardo,

    No, actually the opposite is true.  The TIOL111 allows the user to supply an external voltage at the level of the MCU's digital IO signals such as 3.3V or 5V.  The device uses this voltage to bias the digital signals and level shift them to the correct internal voltage required by the digital core.  The digital core still operates off of the L+ so that it can monitor for fault conditions etc. but if the VCC_IN is not supplied, the device will not operate properly. 

    However, either the TIOL1113 or TIOL1115 will operate completely off of the L+ voltage and it will use the internal LDO voltage of either 3.3V or 5V to bias the digital IO signal levels accordingly.  You do not need to connect anything else to the VCC_OUT if you simply want to have the device powered by L+, and it is also possible to use an external 3.3V or 5V supply for the rest of your circuit as long as it matches the version of the TIOL111x you have chosen based on your digital IO level needs.

    Regards,

    Jonathan