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PCA9306: I2C Tolerance

Einav Atiya
Prodigy 70 points
Part Number: PCA9306

Hello,

What are the tolerances of SCL1,SDA1,SCL2,SDA2?(VinHighMin,VinLowMax,VoutHighMin,VoutLowMax)

Thank you,

Einav

  • 0
    Guru 317170 points

    This device is a passive switch and has no buffered I/Os; for signal voltages below VCCA, it behaves like an analog switch.

    For low voltages, the output voltage is the input voltage plus the voltage drop over the switch, i.e., VO = VI + RON × I. (Please note that I²C currents are much lower than the datasheet's test condition.) For high voltages, the voltage is determined only by the pull-up resistors.

  • 0
    TI__Mastermind 47948 points

    Hi Einav,

    If you are talking about the input/output voltages of the device pins for SDA and SCL, these pins can handle -0.5V to 7V before being susceptible to permanent damage. These voltages can change slightly however, if the overall pass current is kept underneath the continuous channel current which is <128mA.  We recommend that users do not use the device above 64mA of pass current through the FET that separates sides 1 and 2 of the device. 

    The PCA9306 is a passive device and does not drive voltages on the output with an input present on either side. As Clemens mentioned, the low voltage output for this device is the input voltage plus a small voltage drop across the switch. Vo(side 2) = VI(side 1) + Ron x Ipass. 

    Ipass would be the current that an open-drain driver on either the controller/master or target/slave device is sinking when driving a logic low signal on the I2C bus. This current is affected by the overall pull-up resistance seen on side 1 and side 2 of the PCA9306. 

    Regards,

    Tyler