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RAK13004 WisBlock PWM Expander Module Datasheet

Overview​

Description​

The RAK13004 is a PWM expander module that can be mounted to the IO slot of WisBlock Base board. It can be controlled 16-channel LED, and the module uses PCA9685 from NXP, I2C interface.

Features​

  • 16 LED drivers connector
  • 1 MHz Fast-mode Plus compatible I2C-bus interface
  • 4096-step (12-bit) linear programable brightness per LED
  • LED output frequency typically varies from 24 Hz to 1526 Hz
  • Supports hot insertion
  • Low Standby Current
  • 5.5 V tolerant inputs
  • Operating Voltage: 2.3 V to 5.5 V @ -40 °C to +85 °C
  • Chipset: NXP Semiconductors PCA9685
  • Module size: 25X35 mm

Applications​

  • RGB or RGBA LED drivers
  • LED status information
  • LED displays

Specifications​

Overview​

Mounting​

The RAK13004 module can be mounted to the IO slots of the WisBlock Base board. Figure 1 shows the mounting mechanism of the RAK13004 on a WisBlock Base board.

Figure 3035: RAK13004 WisBlock PWM Expander Module Mounting

Hardware​

The hardware specification is categorized into five parts. It shows the chipset of the module and discusses the pinouts of the module and its corresponding functions and diagrams. It also covers the electrical and mechanical parameters that include the tabular data of the functionalities and standard values of the RAK13004 WisBlock PWM Expander Module.

Chipset​

The RAK13004 PWM Expander Module uses PCA9685 from NXP Semiconductors.

VendorPart Number
NXP SemiconductorsPCA9685

Figure 2 shows PCA9685 device addressing. Default A5, A4, and A3 are connected to ground, and A2, A1, and A0 are optional. It can be connected to 3.3 V or GND. Default 7-Bits I2C address is 0x80.

Figure 3036: The PCA9685 device addressing

Pin Definition​

The RAK13004 WisBlock PWM Expander Module comprises a standard WisConnector. The WisConnector allows the RAK13004 module to be mounted on a WisBlock Base board. The pin order of the connector and the pinout definition is shown in Figure 3.

NOTE
  • I2C related pins, OE, 3V3_S, and GND are connected to this module.
  • OE output enable pin, low active, internal pull-up, disable output.
  • 3V3_S voltage output from the WisBlock Base that powers the RAK13004 module can be controlled by the WisBlock Core via WB_IO2 (WisBlock IO2 pin). This makes the module ideal for low-power IoT projects since the WisBlock Core can totally disconnect the power of the RAK13004 module.
Figure 3037: RAK13004 WisBlock PWM Expander Module Pinout

Electrical Characteristics​

Recommended operating Conditions​
SymbolDescriptionMin.Nom.Max.Unit
VDDPower supply3.3V
IDDSupply current-610mA
IstbStandby current-2.215.5uA
VPORpower-on reset voltage-1.72.0V

Mechanical Characteristic​

Board Dimensions​

Figure 4 shows the dimensions and the mechanic drawing of the RAK13004 module.

Figure 3038: RAK13004 WisBlock PWM Expand Module Mechanic Drawing
WisConnector PCB Layout​
Figure 3039: WisConnector PCB Footprint and recommendations

Schematic Diagram​

PWM Expander​

Figure 6 shows RAK13004 PWM expander module IO expand schematic. Default use 3V3_S for power supply.

Figure 3040: RAK13004 WisBlock PWM Expander Schematic
Device Address​

Figure 7 shows device address bit2-bit0. Default is connected to ground.

Figure 3041: RAK13004 WisBlock Device Address A2-A0