Specification for RAK4270 LoRa Module WisDuo-LoRa Series Version V1.2 | Apr2020 www.RAKwireless.com Visit our web site for more document.
Table of Contents 1. General Overview ...................................................................................................3 Introduction ................................................................................................................................. 3 Main Features ............................................................................................................................. 3 2. RAK4270 LoRa Module ...............................................................
1. General Overview Introduction The RAK4270 LoRa Module includes a STM32L071 MCU and a SX1262 LoRa chip, which supports 8 spreading factors (SF5 ~ SF12) and signal bandwidth that can be adjusted between 7.8 kHz to 500 kHz. The module complies with the LoRaWAN 1.0.2 protocol, so it can be used for implementing LoRa networks or Lora point to point communications.
20 kbytes RAM 6 kbytes of data EEPROM with ECC Compliance with [TBC][add regulations here] 2. RAK4270 LoRa Module Device Overview Figure 1 shows the top view of the RAK4270 LoRa module. The dimensions of the module are 15 x 15.5 x 2.5 mm.
Pin Definition & Pin Out The Figure 3 shows the pinout of the RAK4270 LoRa module.
The table below shows the pin definition of the RAK4270 LoRa Module.
USART1_CK,I2C3_SCL, 17 PA8 I/O 18 MCU_NRST I/O 19 GND - Ground Ground 20 VDD - DC3V3 Supply voltage 2.0~3.
Table 2 | Pin Definitions Power Consumption Frequency Output Power 125kHz: 902.3-914.9MHZ 10.19dBm 500kHz: 903.0-914.2MHZ 11.41dBm Recommended Circuit SWD programming Port In order to upgrade the firmware, the SWD (Serial Wire Debug) interface must be used. A 5 pin JLINK cable has to be connected to the SWD port. These pins are: 3v3, SWDIO, SWCLK, and MCU_NRST. UART ports There are two UART ports on RAK4270 module.
I2C port The RAK4270 exposes a I2C port, in which the SDA line is assigned to the pin9, and SCL line is assigned to pin10. This I2C port allows to control additional slave sensors with the RAK4270 using I2C protocol. The RAK4270 will be the master. If the I2C port is used, then external pull-up resistors mus added to the SDA and SCL lines. The recommended value of the resistors are 10 kOhm. RF port The RAK4270 module expose two types of RF antenna: IPEX and PAD.
Mechanical Dimensions The Figure 8 shows the mechanical dimension of the RAK4270 LoRa module.
Recommended Footprint Figure 4 | Recommended PCBfootprint 11
Recommended Reflow Profile Figure 5 | Recommended ReflowProfile Standard conditions for reflow soldering: Pre-heating Ramp (A) (Initial temperature: 150℃): 1~2.5℃/sec; Soaking Time (T2) (150℃~180℃): 60sec~100sec; Peak Temperature (G): 230~250℃; Reflow Time (T3) (>220℃): 30~60 sec; Ramp-up Rate (B): 0~2.5℃/ sec; Ramp-down Rate (C): 1~3℃/ sec. Customer Support Please contact us if you need technical support or need more information. Support center: https://forum.rakwireless.
3. Revision History Revision Description Date 1.0 Initial version 2020-04-02 1.1 First review 2020-04-07 4. Document Summary Prepared by Checked by Hairui Penn & Vladislav Approved by About RAKwireless: RAKwireless is the pioneer in providing innovative and diverse cellular and LoRa connectivity solutions for IoT edge devices. It's easy and modular design can be used in different IoT applications and accelerate time-to-market. For more information, please visit RAKwireless website at www.
FCC Warning： This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions. (1) This device may not cause harmful interference; (2) This device must accept any interference received, including interference that may cause undesired operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. INTEGRATION INSTRUCTIONS 1.
