RAK5804 WisBlock Interface Extension Module Datasheet

Overview

Description

RAK5804 WisBlock Interface Extension Module was designed to be part of a production-ready IoT solution in a modular way and must be combined with a WisBlock Core and a Base module.

This module is designed as an IO extension module that allows you to connect your digital or analog devices or sensors to create a customized IoT solution. These sensors are connected through two expansion connectors: J2 and J3. In order to provide power to peripheral devices, 3.3 V can be obtained from these expansion connectors. Internal protections allow to shut down the power supply when a short circuit is detected in the peripheral devices. Overcurrent cases are protected through internal PTC thermistors in the power supply circuit.

In addition, the RAK5804 module also supports a USB interface, which can be used with RAK5005-O to access the USB port of MCU of the WisBlock Core module of the solution.

All external expansion interfaces of the RAK5804 module are equipped with TVS protection circuit to avoid damaging the mainboard and WisBlock Core circuit with ESD when users plug in or unplug to the expansion interfaces.

Features

• IO connector
• Supports two (2) pieces of 10-pin IO extension connectors
• Supports one (1) USB connector to access WisBlock Core Module
• TVS protected circuity
• PTC thermistor to prevent output power overload
• Dimension: 25 mm x 15 mm

Specifications

Overview

The RAK5804 module can be mounted on the IO slot of the WisBlock Base board. Figure 1 shows the mounting mechanism of the RAK5804 on a WisBlock Base module, such as a RAK5005-O.

Figure 1: RAK5804 mounting mechanism on a WisBlock Base module

Hardware

The hardware specification is categorized into four parts. It discusses the interfacing, pinouts and its corresponding functions and diagrams of the module. It also covers the electrical and mechanical characteristics that include the tabular data of the functionalities and standard values of the RAK5804 WisBlock™ Module.

Interfaces

The RAK5804 module exposes the IO pins, the I2C, and the UART communication ports through the J2, J3, and J4 connectors. Users can use these ports to connect sensors, digital I/O, analog I/O, and slave devices. These ports are routed to the WisBlock Core through the IO connector.

NOTE

The J2 and J3 connectors use a JST SH Connector.

Figure 2: RAK5804 J2, J3, and J4 I/O connectors

J2 Connector

Figure 3: RAK5804 J2 Connector

Pin Number	Function Description
1	VBAT, Battery Power Supply
2	3.3 V
3	GND
4	I2C1_SCL
5	I2C1_SDA
6	IO1, GPIO1
7	IO3, GPIO3
8	UART1_RX
9	UART1_TX
10	IO4, GPIO4

J3 Connector

Figure 4: RAK5804 J3 Connector

Pin Number	Function Description
1	VBAT, Battery Power Supply
2	3.3 V
3	GND
4	LED1
5	LED2
6	AIN1, ADC Input
7	IO2, GPIO2
8	SW1
9	I2C2_SCL
10	I2C2_SDA

J4 Connector

Figure 5: RAK5804 J4 USB connector

Pin	Description
1	USB_VBUS (+5 V)
2	USB_DM
3	USB_DP
4	NC
5	GND

Pin Definition

The RAK5804 module comprises a standard WisBlock Interface connector. This IO connector allows the RAK5804 module to be mounted on a WisBlock baseboard, such as the RAK5005-O. The pin order of the connector is shown in Figure 6.

Figure 6: RAK5804 WisBlock Interface connector

Pin Number	Description	Pin Number	Description
1	Battery Power	2	Battery Power
3	GND	4	GND
5	3V3 Power	6	NC, Power Reserved for 3.3 V
7	USB+	8	USB–
9	VBUS	10	SW1
11	NC	12	NC
13	NC	14	LED1
15	LED2	16	NC
17	NC	18	NC
19	SDA for I2C1	20	SCL for I2C1
21	NC	22	Analog1 to MCU
23	NC	24	NC
25	NC	26	NC
27	NC	28	NC
29	IO1	30	IO2
31	IO3	32	IO4
33	TXD1	34	RXD1
35	SDA for I2C2	36	SCL for I2C2
37	NC	38	NC
39	GND	40	GND

Electrical Characteristics

This section shows the maximum and minimum ratings of the RAK5804 module and its recommended operating conditions. Refer to the tables presented below.

Absolute Maximum Ratings

Symbol	Description	Minimum	Nominal	Maximum	Unit
VBAT	Power Supply for the Module	–0.5		4.2	V
3V3	3.3 V Power Supply	–0.5		3.6	V
Ifuse	PTC Protection Current			500	mA
TEMP	Working Temperature	–30		65	°C
Storage	Storage Temperature	–40		85	°C

Recommended Operating Conditions

Symbol	Description	Minimum	Nominal	Maximum	Unit
VBAT	Power Supply for the module	2.6		4.2	V
3V3	3.3V Power Supply	3.0	3.3	3.6	V

Mechanical Characteristics

Board Dimensions

The mechanical dimensions of the RAK5804 module are shown in Figure 7.

Figure 7: RAK5804 Mechanical Dimensions

WisConnector PCB Layout

Figure 8: WisConnector PCB footprint and recommendations

Schematic Diagram

Figure 9 shows the schematic diagram of the RAK5804 WisBlock Interface connector, USB connector, and the 10 mechanical holes.

Figure 9: RAK5804 Schematic Diagram