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TCA9517: TCA9517

srinivas at
Prodigy 40 points
Part Number: TCA9517
Other Parts Discussed in Thread: TCA9803

Hi,

we will start hardware design using withTCA9517 for 5 volt quality 5 nos of sensors on I2C bus, micro controller support 5 volt support I2C bus port. please sagest we can use TCA9517 IC between to Micro controller  to sensors?

Thanks & Regards

Srinivas

  • 0
    Prodigy 40 points

    Hi,

    we will start hardware design using withTCA9517 for 5 volt air quality 5 nos of sensors on I2C bus, micro controller power VCC is 5 volt support. please sagest we can use TCA9517 IC between to Micro controller  to sensors?

    Thanks & Regards

    Srinivas

  • 0
    TI__Guru 53575 points

    Hi Srinivas,

    TCA9517 is a level shifting buffer typically used to allow communication between low voltage and higher voltage I2C devices. Another common use case is to use the device as a switch to enable or disable sections of the bus to avoid address conflicts. 

    In the design you will start on, are you planning to implement TCA9517 for one of these use cases? If not, what would be the function of TCA9517 in your design? 

    We recommend TCA9803 for new designs. This device is pin-for-pin compatible with TCA9517 with improved performance for signal integrity, rise times, and slew control. TCA9803 also has integrated current sources on the B-side which removes the need for pull-up resistors on this side of the device.

    Regards,

    Eric

  • 0 in reply to Eric Schott1
    Prodigy 40 points

    Hi ERIC,

    Thanks for information,

    Please confirm as below design, micro controller 5Volts supply , sensors 5 volt supply

    Thanks & Regards

    Srinivas

  • 0 in reply to srinivas at
    Prodigy 40 points

    Hi ERIC,

    Thanks for information,

    Please confirm as below design, micro controller 5Volts supply , sensors 5 volt supply

    Best regards

    Srinivas

  • 0 in reply to srinivas at
    TI__Guru 53575 points

    Hi Srinivas,

    I don' see an issue with the layout you show in the above figure. The B-sides of TCA9803 are isolated from each other as shown in Figure 8 of the datasheet. I would suggest double checking that the input voltage low (Vil) of the slave sensor devices is compatible with the output low voltage (vol) of TCA9803. Also note that pull-up resistors are required on the A-side (master-side above) I2C bus but not on the B-side (slave-side above). 

    I presume TCA9803 is being used as a switch in your design to manage address conflicts. Are you allowing the microcontroller to drive the enable pins to manage which device it is able to communicate with?

    Let me know if you have any particular concerns or questions about the design.

    Regards,

    Eric