961 ledcontroller

961 : ledcontroller

Design render
  • Author: Mathias Garstenauer
  • Description: A WS2812b addressable LED controller configurable via I2C
  • GitHub repository
  • Clock: 25000000 Hz

How it works

This tinytapeout projects implements i2c to drive ws2812b individual addressable LEDs. The IC can be addressed with the address 0x4A. The register address corrosponds with the sequential bytes of the leds as follows:

address data
0x00 green0
0x01 red0
0x02 blue0
0x03 green1
0x04 red1
0x05 blue1
0x06 green2
... ...
0x green
0x red
0x blue

i2c uses external pullups and open collector outputs. In order to implement this the IOs were configured so that the input is handled as input by the verilog module. The out put is set to 0 and the i2c output of the verilog modules toggles between in- and output mode. Therefor listening to the i2c communication should work just fine with the IOs in input mode, where they have a high impedance. If something has to be sent (e.g. acknowledge) the IO is set to output a low value and pulls the i2c line to ground. Should there be any problems with this configuration the SDA and SCL lines are also present on the normal outputs.

How to test

Connect an i2c-master to the chip and write values to the desired registers. The IC supports sequetial write by auti incrementing the register address if more than one byte is sent. The LED should update immediately.

External hardware

Microntroller/computer (e.g. STM32, Arduino, Raspberry Pi, ...), ws2812b LED (strip, matrix, ...), external pullup resistors for i2c

IO

#InputOutputBidirectional
0i2c SCL alternative for PNP open collectori2c SCL
1i2c SDA alternative for PNP open collectori2c SDA
2ws2812b LED output
3
4
5
6
7

Chip location

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