TLC5955

Patrick Coulombe

Other Parts Discussed in Thread: TLC5955, TLC5947

Hi all,

I'm looking for helps using the TLC5955 with an AVR-GCC. First of all, some questions about this device:

The pins are labelled OUT(RGB)x. But can I still use this device for controlling individual leds (not RGB)?
To control this device I need to use SPI, but what about the serial interface: what is it for (only outputting)?

I am also wondering about this information: GS data must be sent from the micro and latched in. Not sure the implication of this.

I found a complete implementation in AVR-GCC for the TLC5940. Could I use that, what differs? A reply from the author of the library:

"...

The tricky part will be that the GS data array will be much bigger, so I'm not sure if the microcontroller will have enough memory to double buffer it. Also I'm not sure that you'll have enough clocks to send out all of the data that would be required within a GS cycle.

..."

Will I be able to run the code on a ATMEGA328p:
- 20mhz
- 32k flash
- 2k SRAM

Any hints?
Cheers

over 11 years ago

0 Kylen Naidoo over 10 years ago

Prodigy 10 points

Hi patrick. I came on this forum to find out the exact same question you asked. I am currently doing an final year project using POV and a single arc of 64 LEDs. Somehow i cant get the TLC5955 to work. Something to do with latching i suspect.

Any tips?

thanks in advance

0 Patrick Coulombe over 10 years ago in reply to Kylen Naidoo

Prodigy 20 points

Hi Kylen,

I am afraid I won't be of any help. I finally used the TLC5947 (internal clock so no more messing with GS).

Good luck!

0 Feifei Shen over 10 years ago in reply to Patrick Coulombe

TI__Expert 3275 points

Hi Patrick and Kylen,

I wish you have solved your problem,

For tlc5955, you need generate GS clock with your controller, while it's more simple using tlc5947.

Also, you can drive individual LED drivers other than R/G/B only, other channel current capability different.

Pls let me know if you want more.

Best regards,

Feifei

0 Simon Watkins over 10 years ago in reply to Feifei Shen

Prodigy 10 points

Hi Feifei,

I'm currently trying to implement 2 TLC5955's daisy-chained and have been stuck for days with a fast approaching deadline. My biggest problem appears to be how to time the GSCLK pulses and the GSData together. Any help would be greatly appreciated!

Regards,

Simon

0 Feifei Shen over 10 years ago in reply to Simon Watkins

TI__Expert 3275 points

Hi Simon,

What do you mean by time GSCLK and GSDATA together?

Any details?

Genernally speaking, we are usin SIN/SCLK for Data input, and using GSCLK for display.

Best regards,

Feifei

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TLC5955