TLC5954: Interfacing TLC5954 with Raspberry Pi3B+

Mahesh Patel90

Part Number: TLC5954

I have selected TLC5954 as display driver for led based user interface. The controller is Raspberry Pi3B+.

A SPI port will not let transfer 49 bits, I am able to transmit 48 bits using SPI and verify on oscilloscope.

How to transfer the 49th bit? Same PI3B+ pins using SPI.

The 49 bits can be transferred using bit-bang interface, which is not acceptable.

IS there another approach?

Mahesh

0 Clemens Ladisch over 6 years ago

Guru 316470 points

The 49 bits are organized as a shift register, and this device allows chaining multiple chips with the SIN/SOUT pins.

So just transfer 56 bits; the first 7 bits will fall out of the SOUT pin and can go to the bit bucket.

0 Shawn Ding over 6 years ago

I will suggest to use GPIO to transmit the data if you have not cascaded two many devices.

Regards,

Shawn.

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