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Original question:

TCA9535: Leakage current to Vcc (at Vcc=0V, SCL/SDA=5V)

TCA9535: Leakage current to Vcc (at Vcc=0V, SCL/SDA=5V) #2

Yusuke Mukuno
Expert 7395 points
Part Number: TCA9535

Hi Danny-san

From following session.

TCA9535: Leakage current to Vcc (at Vcc=0V, SCL/SDA=5V) - Interface forum - Interface - TI E2E support...

e2e.ti.com
Part Number: TCA9535 Hi expert, Does TCA9535 have any leakage current to Vcc when Vcc=0V and SCL/SDA=5V? My customer is considering about leakage current

Customer have additional question.

Which is correct?

1: "SCL/SDA don't have any path to Vcc".

or

2: "SCL/SDA have the path to Vcc, but IC can accept leakage current for IC damage"

Thanks

Muk

  • 0
    TI__Mastermind 26776 points

    Muk-san,

    Good to hear from you, and thanks for following up!

    The device should remain high-impedance when unpowered (VCC = 0) even if there is a pull-up or pull-down to a power/GND rail on SCL/SDA. You shouldn’t expect to see any high leakage current unless the SCL/SDA pins are pulled below GND or above VCC, in which case some body diodes may begin reverse breakdown or it may start to power an ESD cell.

    Best,

    Danny