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TLC5973: LED Driver IC

GARETH OU
Mastermind 9685 points
Part Number: TLC5973

Hi 

Please help let me know the following questions

1. Is the execution method of PWM as described in "Figure 13. PWM Operation", If yes, what is the highest refresh rate?

2. Please provide information about Command (12bits)? Is it a fixed 3AAh? If so? Is it impossible to adjust the current gain of the driver by software?

3. What is the correspondence between data transmitted via SDI and Gray Scale (36bit)? Do you refer to "Figure 21. Common Shift Register and Control Data Latches Configuration"?

Thank

  • 0
    TI__Genius 12915 points

    Hi Gareth,

    1. Internal GS oscillator frequency is 12Mhz and output PWM ratio is 12-bit, so that highest refresh rate is 12M / 4096 = 2.9kHz.

    2. Yes the write command is fixed as 3AAh. I am not sure what your current gain mean. If you need to adjust peak output current, it is only controlled by external resistor RIREF. If you need to change average output current, the PWM duty cycle could be set by SDI data.

    3. Total transmitted data 48-bit is consisted by 12-bit write command (3AAh) + 12-bit OUT0 gray scale + 12-bit OUT1 gray scale + 12-bit OUT2 gray scale. Yes you could find detail in datasheet Figure 21 and Table 3.