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Cascade connection of TLC59025

takahiko yokota
Mastermind 7135 points
Other Parts Discussed in Thread: TLC59025

Hi

My customer will use TLC59025 by cascade connection.
Are there the documents about cascade connection?
Could you give me them?
Best regards,
Yokota
  • 0
    Mastermind 7135 points
    Hi

    If Iout=24mA, do you recommend 780Ω as the value of Rext?

    Best regards,
    Yokota
  • 0 in reply to takahiko yokota
    TI__Expert 3460 points

    Yokota,

    Yes, you are correct with the Rext value based off the formula in the datasheet.

    For the cascaded devices, you will connect the SDO of the first device into the SDI of the second device (follow this same pattern for each LED driver). The CLK of all devices should be tied together, and trace capacitance should be minimalized to make sure the different CLK signals are aligned.

    The Latch and OE pins will depend on the application. For example, if you will have 30 LEDs and each iteration you will transmit 30 bits of data, you can tie the Latch pins together and the OE pins together for a total of 2 pins needed. This would be the easiest method to implement and will not require more microcontroller pins if you add another LED driver.