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Original question:

TCA9548APWR

TCA9548A: Voltage Transmission Issue

Matt Qi
Intellectual 2270 points
Part Number: TCA9548A

Hi

I have a question about the voltage transmission of the TCA9548APWR: 

If there is a low-level voltage (0.1V) on the I2C input of the chip pin SDA/SCL, will it cause a low-level voltage (0.1V) on the SD[0:7] terminal on the other end of the chip or is it close to 0V?

  • 0
    Guru 268470 points

    This device is a passive switch. The output voltage will be the same as the input voltage (plus a small voltage drop over the switch resistance, depending on the current).

  • 0
    TI__Mastermind 28623 points

    Hi Matt,

    Clemens answered this question well. 

    The TCA9548A is a passive I2C controlled switch. The element separating the main I2C channel from an enabled downstream channel is a passFET with a small RDS_ON. A low-level input 0.1V VOL will appear on the output + RDS_ON x Ipass (current through the channel). 

    Regards,

    Tyler