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Writing software for the TLC5940 LED drivers. March 2nd, 2012. If you are planning on using the Texas instruments TLC5940 LED drivers for your project, than make sure you check out this book. Especially if you are working with AVR microcontrollers like the Arduino sets. TLC5940 SLVS515D –DECEMBER 2004–REVISED NOVEMBER 2015 TLC5940 16-Channel LED Driver With DOT Correction and Grayscale PWM Control 1 Features 3 Description The TLC5940 is a 16-channel, constant-current sink 1• 16 Channels LED driver. Each channel has an individually.
The way I understand SPI is that 3 wires are shared (MOSI, MISO, & SCHK). The slave select is pulled high when you want to write to a specific device. The 3 shared wires can be daisy chained. The TLC5940 LED Driver says that it uses SPI but I don't see any documentation about a slave select. Can I just include this in the standard daisy chaining and assign a new slave select? In some forums online some people seem to indicate you can't use the TLC5940 on the same SPI bus as other devices. I thought that was the whole point of SPI. Are there different forms of SPI? I'm quite confused, can I use the TLC5940 with other SPI devices?
1 Answer
Can I just include this in the standard daisy chaining and assign a new slave select?
SPI is normally used as a parallel bus and requires MISO to be tri-state (disconnected when not selected).
Led Drivers For Home Light Fixtures
In some forums online some people seem to indicate you can't use the TLC5940 on the same SPI bus as other devices.
The device does not have a chip select which gives a challenge. No direct wiring is possible but can be solved.
Are there different forms of SPI? I'm quite confused, can I use the TLC5940 with other SPI devices?
It is possible to connect the TLC5940 but it requires some extra logic. You can for instance block the clock signal when it is not selected. This can be done with a MOSFET or 74HC125 and a pull-low resistor.
Cheers!