LED Matrix Design RP2040

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Below is a suggested pin allocation for the RP2040 when using hardware SPI for communicating with the TLC5940 chain:

Table

RP2040 SignalRP2040 PinFunction
SPI SCLKGP18Hardware SPI clock (SPI0_SCK)
SPI MOSIGP19Hardware SPI transmit (SPI0_TX, used as MOSI)
This allocation enables the RP2040 to send serial data using its hardware SPI interface to the TLC5940 chain for controlling the LED matrix.
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Allocate additional RP2040 pins for controlling XLAT, BLANK, and GSCLK signals to the TLC5940.

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Below is a suggested pin allocation for the additional control signals:

Table

RP2040 SignalRP2040 PinFunction
XLATGP20Latch signal to load the shift register data across the chain.
BLANKGP21Controls output blanking (disables/enables LED outputs).
GSCLKGP22Provides the grayscale clock for PWM brightness control.
This allocation ensures dedicated digital outputs from the RP2040 for controlling the daisy-chained TLC5940 devices in your 16×16 LED matrix design.
Allocate Pins for SPI Communication
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Schematic

Layout

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C1
Capacitance
0.1uF
U1
IC1

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