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TCA5013: 2x TCA5013 operation with 8 SAMs

Cuong Nguyen Viet
Prodigy 140 points
Part Number: TCA5013

Tool/software:

Hi team,

My project is using 2x SAM ICs - TCA5013 for 8 physical SAMs cards.
I have some concerns about the operation of the 2 TCAs.

Currently in the design, 2 TCA5013:

  • Different I2C address
  • Sharing SC CLK, SC IO from MCU
  • IRQ1, IRQ2, SHDN1, SHDN2 separately from MCU

Question is:
1) Can 2 TCA ICs as well as 8 SAMs work in turn when different I2C addresses? (both SHDN pins=1)

2) Can the 2 SHDN pins of TCA share 1 GPIO pin from MCU ?

3) If TCA5013 enters shutdown mode(SHDN=0), what are the states of the SC CLK, SC IO pins? high-impedance ? Will it affect the remaining TCA5013(CLK/IO) if I shutdown 1 of the 2 TCA5013?

Here is my schematic for 2x TCA5013:

Kindly review and let me know your valuable comments. Thanks a lot.
VietCuong

  • 0
    TI__Guru*** 145105 points

    HI VietCuong:

    Cuong Nguyen Viet said:
    1) Can 2 TCA ICs as well as 8 SAMs work in turn when different I2C addresses? (both SHDN pins=1)

        yes it can be 8 SAMs for two TCA devices with  different I2C address.

    Cuong Nguyen Viet said:
    2) Can the 2 SHDN pins of TCA share 1 GPIO pin from MCU ?

     works only if SHDN is always high

    Cuong Nguyen Viet said:
    3) If TCA5013 enters shutdown mode(SHDN=0), what are the states of the SC CLK, SC IO pins? high-impedance ? Will it affect the remaining TCA5013(CLK/IO) if I shutdown 1 of the 2 TCA5013?

    in SHDN mode, only card insertion detection circuitry still works all other IOs are shutdown..

    If you share SHDN pin, how can you control which TCA to shuntdown.

    Best

    Brian