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RAK14012 WisBlock LED Matrix Datasheet

Overview​

Description​

RAK14012 is an LED matrix driver module for WS2812B LEDs, which has a control circuit and RGB chip.

To drive the WS2812B, the RAK14012 has a built-in boost circuit to generate 5 V voltage output. But it is recommended to use an external power supply to power the LED Matrix.

Features​

  • LED matrix driver
  • 3.3 V Power supply
  • Module Size: 25 mm x 15 mm

Specifications​

Overview​

Mounting​

The RAK14012 WisBlock LED Matrix can be mounted to the IO slot of the WisBlock Base board. Figure 1 shows the mounting mechanism of the RAK14012 on a WisBlock Base board, such as the RAK5005-O.

Figure 1: RAK14012 WisBlock LED Matrix mounting

Hardware​

Pin Definition​

The RAK14012 WisBlock LED Matrix comprises a 40-pin WisConnector. The 40-pin WisConnector allows the RAK14012 module to be mounted to a WisBlock baseboard, such as RAK5005-O. The pin order of the connector and the pinout definition is shown in Figure 2.

NOTE
  • The VBAT, GND, EN (WB_IO6), and DOUT (WB_IO5) are connected to WisConnector.
Figure 2: RAK14012 WisBlock LED Matrix pinout

Electrical Characteristics​

SymbolDescriptionConditionMin.Nom.Max.Unit
VBATLithium battery outputNormal operation3.3-4.2V
3V3_S3.3 V from WisBaseNormal operation-3.3-V
5VOutput from boostNormal operation-5-V

Mechanical Characteristics​

Board Dimensions​

Figure 3 shows the dimensions and the mechanical drawing of the RAK14012 module.

Figure 3: RAK14012 WisBlock LED Matrix dimensions
WisConnector PCB Layout​
Figure 4: WisConnector PCB footprint and recommendations

Schematic Diagram​

It has a boost circuit to generate 5 V because the supply for WS2812B must be between 3.7 V and 5.3 V. It is recommended to use an external power source to power the LED Matrix because of its high power consumption.

Connector​
Figure 5: RAK14012 connector connection
Boost​
Figure 6: RAK14012 boost circuit
Power Selection​
Figure 7: RAK14012 power selection
warning
  • Make sure that the jumper from 5V_OUT of RAK14012 WisBlock LED Matrix is disconnected when connecting to an external power supply.
  • LED Matrix DIN should be connected to RAK14012 DOUT.
  • LED Matrix GND should be connected to RAK14012 GND.
Connector for LED Matrix​
Figure 8: RAK14012 connector for LED matrix