RAK4260 WisDuo LPWAN Module Datasheet

Overview

Description

The RAK4260 WisDuo LPWAN Module is based on Microchip’s ATSAMR34J18B. It is a SiP device integrating a 32-bit ARM Cortex M0+ MCU with a LoRa Transceiver in a 15 mm x 15 mm compact package.

The SAM R34 chip provides a number of highly configurable peripherals (configurable as I2C/SPI/UART interfaces). There are 12-bit ADC in addition to the aforementioned.

It is a perfect solution for any LoRaWAN end node developer. The integration of the MCU and LoRa Transceiver reduces size and minimizes costs. Having such a compact solution within a single package reduces time to market and allows for rapid development and deployment for a number of scenarios.

RAK4260 is a solution that is cost-efficient and flexible that can be deployed in a wide variety of IoT scenarios that require the long-range connectivity and great battery life that LoRaWAN provides.

Features

• Industry's lowest power LoRa SiP device
• 32-bit ARM Cortex M0+ MCU and LoRa Transceiver
• Small form factor: 15 mm x 15 mm compact package
• 256 KB Flash and 40 KB RAM accommodates application code and stack
• Most cost and size effective solution, eliminating the need for external MCU
• Fully supported 862 to 1020 MHz frequency coverage
• Receive Sensitivity down to -148 dBm
• Maximum Transmit Power up to 20 dBm
• Low RX current of 17 mA (typical)
• LoRa Technology, (G)FSK, (G)MSK

Specifications

Overview

The overview section covers the RAK4260 WisDuo LPWAN Module board overview where both top and bottom views are presented. It also includes the functional block diagram showing the interfaces of the board.

Board Overview

Figure 1 and Figure 2 present the different views of the RAK4260 chip labeled for the proper reference.

Figure 7630: RAK4260 WisDuo LPWAN Module Top View

Figure 7631: RAK4260 Bottom View

Block Diagram

The block diagram of the RAK4260 shows the various interfaces for the specific functionalities set in the product overview.

Figure 7632: RAK4260 Interfaces

Hardware

The hardware specifications are categorized into five parts. It presents the schematic diagram and pinouts of the module. This section covers also the electrical, mechanical, and frequency parameters including tabular data and diagrams of the RAK4260 WisDuo LPWAN Module board.

Pin Definition

Provided in this section is the pinout of the RAK4260 WisDuo LPWAN Module.

Figure 7633: RAK4260 Board Pinout

warning

When using RFC pin for antenna and not the IPEX connector variant, there are design considerations to make sure optimum RF performance.

• RF trace must be away from interference (switching node of DC-DC supply, high current/voltage pulses from controllers of inductive load like motor, signal generators, etc.)
• RF trace must have 50 Ohms impedance. It is advisable to use an impedance simulation software tool to achieve this requirement.
• If using an external antenna connector, make it close to the RFC pin.
• Ground plane optimization is critical on certain antenna types like monopole.
• GND trace used for RF path return must be directly connected to the GND plane and not be treated as thermal relief.
• It is recommended for the RF trace to be routed in a curve and not in a sharp 90 degrees.

In addition, with a commitment to making IoT easy, RAK offers a dedicated service for Antenna RF Design which includes PCB design, tuning, matching, and RF testing.

PIN	NAME	I/O	Description
1	GND	-	Ground
2	RFC	-	RF Port
3	GND	-	Ground
4	PA27	I/O	EIC/GCLK
5	PA06	I/O	EIC/RSTC/ADC/PTC/OPAMP/TC/CCL/SERCOM0
6	PA07	I/O	EIC/RSTC/ADC/OPAMP/TC/CCL/SERCOM0
7	PA08	I/O	DC/PTC/TC/CCL/SERCOM0/SERCOM2
8	PA09	I/O	EIC/ADC/PTC/TC/CCL/SERCOM0/SERCOM2
9	PB22	I/O	SERCOM5/TC/GCLK/CCL
10	GND	-	Ground
11	VCC3V3	-	3V3 power in
12	VCC3V3	-	3V3 power in
13	PA17_SCL	I/O	EIC/PTC/TC/GCLK/CCL/SERCOM1/SERCOM3
14	PA16_SDA	I/O	EIC/PTC/TC/GCLK/CCL/SERCOM1/SERCOM3
15	PA15	I/O	EIC/TC/GCLK/SERCOM2/SERCOM4
16	PA14	I/O	EIC/TC/GCLK/SERCOM2/SERCOM4
17	GND	-	Ground
18	GND	-	Ground
19	PA18 UART3 RX	I/O	EIC/PTC/TC/AC/CCL/SERCOM1/SERCOM3
20	PA19 UART3 TX	I/O	EIC/PTC/TC/AC/CCL/SERCOM1/SERCOM3
21	NC	-	No Connection
22	PA23_MOSI	I/O	EIC/PTC/TC/AC/CCL/GCLK/SERCOM3/SERCOM5
23	PA22_SS	I/O	EIC/PTC/TC/AC/CCL/SERCOM3/SERCOM5
24	PB23_SCK	I/O	EIC/SERCOM5/TC/GCLK/CCL
25	PB02_MISO	I/O	EIC/ADC/SERCOM5/TC/SUPC/CCL
26	PA25 USB P	I/O	EIC/SERCOM3/SERCOM5/TC/USB_DM/CCL
27	PA24 USB N	I/O	EIC/SERCOM3/SERCOM5/TC/USB_DM/CCL
28	GND	-	Ground
29	RST	-	MCU Reset
30	PA30_SWDCLK	I/O	SWDCLK
31	PA31_SWDIO	I/O	SWDIO
32	PA04 UART1 TX	I/O	EIC/RSTC/VREFB/ADC/AC/OPAMP/TC/CCL/SERCOM0
33	PA05 UART1 RX	I/O	EIC/RSTC/ADC/AC/OPAMP/TC/CCL/SERCOM0
34	NC	-	No Connection
35	GND	-	Ground
36	GND	-	Ground
37	GND	-	Ground
38	GND	-	Ground
39	GND	-	Ground
40	GND	-	Ground

RF Switch Pin Definition

BAND_SEL	TX/RX
PA13	D2

RF Switch control logic table

LoRa Mode	BAND_SEL	TX/RX	PA28
Shutdown	L	L	L
PA_BOOST	L	H	H
RFI_HF (RX)	H	L	H
RFO_HF	H	H	H

NOTE

PA28 is RF Switch VDD pin
H = High level
L = Low level

RF Requirements

Operating Frequencies

The RAK4260 supports LoRaWAN frequency included in the table provided below:

Region	Frequency (MHz)
Europe	EU868
North America	US915
Australia	AU915
Asia	AS923
India	IN865
Korea	KR920

Electrical Characteristics

Power Consumption

Shown in the table provided below is the power consumption of the RAK4260 WisDuo LPWAN Module.

Item	Power Consumption	Condition
OUTPUT POWER 20 dB (MAX)	126.3 mA	PA_BOOST V=3.3 V
OUTPUT POWER 17 dB	95.6 mA(typical)	PA_BOOST V=3.3 V
OUTPUT POWER 14 dB	33.1 mA	RFO_HF V=3.3 V
Receive mode	13.6 mA	-
Sleep mode	860 nA	V=3.3 V Backup Mode

OUTPUT POWER 20 dB(MAX)PA_BOOST mode

Figure 7634: OUTPUT POWER 20 dB(MAX)

OUTPUT POWER 17 dB(PA_BOOST mode)

Figure 7635: OUTPUT POWER 17 dB

OUTPUT POWER 14 dB(RFO_HF mode)

Figure 7636: OUTPUT POWER 14 dB

Receive Mode

Figure 7637: Receive Mode

Sleep Mode

Figure 7638: Sleep Mode

Sensitivity Level

The following chart shows the receiving sensitivity of RAK4260 at 868 Mhz.

Receive Power @iPEX	PER (%) @SF7
-40 to -124	0
-125	3
-126	20
-127	78
-128	100
-129	100
-130	100

Figure 7639: Sensitivity Level (SF7)

Receive Power @iPEX	PER (%) @SF7
-50 to -134	0
-135	0
-136	0
-137	0
-138	7
-139	80
-140	100

Figure 7640: Sensitivity Level (SF12)

Schematic Diagram

Figure 7641: RAK4260 WisDuo LPWAN Module Schematic Diagram

Mechanical Characteristics

Figure 7642: RAK4260 Top View Dimensions

Figure 7643: RAK4260 Side View Dimensions

Software

The latest firmware for the RAK4260 WisDuo LPWAN Module is provided in the given table.

Firmware

Model	Source
RAK4260	Download