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Original question:

ISO7740: abnormal output while input is normal

ISO7740: what's the pull up resistor value on EN pin?

Howard Zou
Genius 12365 points
Part Number: ISO7740

Hi,

I see that EN pin floating can enable the output, so there should be internal pull up resistor connecting EN pin to VCC. What's the value?

  • 0
    TI__Mastermind 49495 points

    Hi Howard,

    The pull-up resistor value is 2MΩ as given in the datasheet I/O schematic diagram (also copied below). If you are using the device in a noisy environment, then we recommend you to use an external strong pull-up resistor (4.7kΩ) connected to EN pin as against the weak internal pull-up resistor. Thanks.

    Regards,
    Koteshwar Rao