• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 653 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Driving multi color leds individually

Serdar Köse
Genius 3360 points
Other Parts Discussed in Thread: TLC59116F, OPT3001

I am working on a demo that consists  8-10 LEDs groups with different wavelengths. Most wave length groups have a single LED, but some wavelengths (e.g. blue) have more than one LEDs in the group. I need to dim each wave length individually via a MCU.

What LED driver(s) would you recommend to use? Do I need a LED driver per wave length or can a LED driver manage multiple wavelength? Is there any similar reference designs that you would suggest me to look at?

  • 0
    TI__Expert 3460 points

    Hi Serdar, 

    My name is Harry Kennedy, and I'm an apps engineer for some of our devices. I wanted to ask a few questions to get a better understanding of what you're trying to do. 

    How many LEDs total are there? are you able to create a quick sketch to show the connections you have?

    If your current requirements are low, I would suggest the TLC59116F. This device has 16 channels that you can determine the current for each channel using a resistor. Dimming options are available, and the device also has I2C communication. 

  • 0 in reply to Harry Kennedy1
    Genius 3360 points

    Hi Harry,

    Thank you for the reply. 

    I am indeed looking for something like TLC59116F it is great that it has 8/16 channel versions with I2C communication that saves GPIO usage of a MCU (although I could allocate 10 GPIOs for each channel), and has an evaluation modules. However, datasheet says it has 120 mA capacity per channel. I was planning to use 350 mA LEDs, I guess there is no  TLC59116F like driver that can support 350 mA per channel, right? One option, I can look for <120 mA LEDs, what would be your suggestion if I need to use 350 mA LEDs?

    Here is a quick sketch. Here below 7 different wave length LEDs (I may limit it on 8 channel depending on what is available). I would like to control each channel (wave length) by the MCU: either via a GPIO per channel (PWM) or I2C/UART/SPI. The number of LEDs ratio will be similar to the below sketch (not necessarily, (it could be x2, or x3).

    Lastly, I would like to measure light intensity on the visible light spectrum and transfer it to the MCU. is OPT3001 a good selection or is there another ALS might be good to look at?.

    Thank you.