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Thread: Enable pin

  1. #1
    Senior Member
    Join Date
    Aug 2016
    Posts
    149

    Enable pin

    I use the charger chip MC34673,in accordance with internal block diagram the pin ΕΝ it is not floating but it's connected with one pull-down resistor.

    https://imgur.com/a/Cyb8Dgd

    When there is internal pull-up or pull-down resistor to the ΕΝ pin it is necessary to connect and with a externall pull-up or pull-down resistor or directly connect the microcontroller pin to the EN pin??

  2. #2
    Junior Member
    Join Date
    Apr 2019
    Posts
    12
    You can connect it directly without any other resistor. Check it with a voltmeter if you want reassurance that it's pulling down to ground.

  3. #3
    Senior Member
    Join Date
    Aug 2016
    Posts
    149
    For example the TPS61291 (page 7) in the block diagram there is no internal pull-down resistor.
    In this case we should to put external resistor,correctly??

    Generally when it exists internal pull-down resistor we drive directly the EN pin by the microcontroller??
    Last edited by thanos; 06-02-2019 at 07:29 PM.

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