RAKwireless RAK4200 Bedienungsanleitung

RAK4200(H) LoRa Module

WisDuo LoRa Module

Version V1.4 Apr2020

Table of Contents

1. Overview.....................................................................................................................3

1.1 Introduction .........................................................................................................3

1.2 Main Features.....................................................................................................3

2. RAK4200(H) LoRa Module.........................................................................................3

2.1 Overview.............................................................................................................3

2.2 Block Diagram.....................................................................................................4

2.3 Supported LoRaWAN bands ..............................................................................4

2.4 Pin Definition & Pin Out ......................................................................................5

2.5 Power Consumption ...........................................................................................7

2.6 Recommended Circuit ........................................................................................7

2.7 Mechanical Dimensions ......................................................................................9

2.8 Recommended Footprint ....................................................................................9

2.9 Recommended Reflow Profile ..........................................................................10

3. Revision History.......................................................................................................12

4. Document Summary ................................................................................................12

1. Overview

1.1 Introduction

RAK4200(H) LoRa Module includes an STM32L071 MCU and an SX1276 LoRa chip. It

has Ultra-Low Power Consumption of 1.5uA in sleep mode and high LoRa output power

up to 19dBm max in work mode.

The module complies with LoRaWAN 1.0.2 protocols. It also supports Lora Point to Point

communications. The module is suitable for various applications that require long range

data acquisition and low power consumption.

1.2 Main Features

LoRa module for Smart City, Smart Agriculture, Smart Industry

Compact Form Factor: 15 x 15.5 x 2.5 mm

20 Pin Stamp Pad for PCB SMT mounting

I/O ports: UART/I2C/GPIO

Temperature range: -40°C to +85°C

Supply voltage: 2.0 ~ 3.6V

Frequency range: 863–870MHz (EU) / 902–928MHz (US)

Low-Power Wireless Systems with 7.8kHz to 500KHzBandwidth

Ultra-Low Power Consumption 1.5uA in sleep mode

Core: ARM 32-bit Cortex – M0+ with MPU

Up to128KB flash memory with ECC

20KB RAM

6KB of data EEPROM with ECC

2. RAK4200(H) LoRa Module

2.1 Overview

The figure below shows the top view of the RAK4200(H) LoRa Module. The dimensions

of the Module are 15 x 15.5 x 2.5 mm.

Figure 1 | RAK4200 LoRa Module

2.2 Block Diagram

The Block diagram below shows the external interfaces of the RAK4200(H) LoRa Module.

Figure 2 | Block Diagram

2.3 Supported LoRaWAN bands

The RAK4200(H) LoRa Module supports the high LoRaWAN bands (refer to the Table 1)

Module

Region

Frequency (MHz)

RAK4200(H)

Indian

IN865

Europe

EU868

North America

US915

Australia

AU915

Korea

KR920

Asia

AS923

Table 1 | Operating Frequencies

2.4 Pin Definition & Pin Out

The figure below shows the pinout of the RAK4200(H) LoRa Module.

Figure 3 | Pinout

The table below shows the pin definition of the RAK4200(H) LoRa Module.

Name

I/O

Description

Alternate functions

UART2_RX

This UART port is used

as an AT command

port(STM32L071KBU6 PA3)

USART1_RX,

I2C1_SDA

UART2_TX

This UART port is used

as an AT command

port( (STM32L071KBU6

PA2)

MCO, USART1_TX,

I2C1_SCL, I2C3_SMBA

UART2_DE

I/O

GPIO (STM32L071KBU6

SPI1_MOSI,EVENTOUT,

PA1)

USART1_RTS_DE,

COMP2_OUT

UART1_TX

I/O

This UART port can be

used as an AT

command port and an

upgrade port or General

GPIO (STM32L071KBU6

PA9)

TIM21_CH1,TIM2_CH3,

USART2_TX,LPUART1_TX,

COMP2_OUT,COMP2_INM,

ADC_IN2

UART1_RX

I/O

This UART port can be

used as an AT

command port and an

upgrade port or General

GPIO (STM32L071KBU6

PA10)

TIM21_CH2,TIM2_CH4,

USART2_RX,LPUART1_RX,

COMP2_INP,ADC_IN3

UART1_DE

I/O

General GPIO or

UART(Reserved)

(STM32L071KBU6 PA12)

EVENTOUT,TIM2_CH2,USART2_RT

S_DE,

TIM21_ETR,

USART4_RX,COMP1_INP,

ADC_IN1

SWDIO

I/O

Programming

(STM32L071KBU6 PA13)

SWDIO, LPUART1_RX

SWCLK

I/O

Programming

(STM32L071KBU6 PA14)

SWCLK, USART2_TX,

LPUART1_TX

I2C_SCL

I/O

I2C interface

(STM32L071KBU6 PB6)

USART1_TX,I2C1_SCL,

LPTIM1_ETR,COMP2_INP

I2C_SDA

I/O

I2C interface

(STM32L071KBU6 PB7)

USART1_RX,I2C1_SDA,

LPTIM1_IN2,USART4_CTS,

COMP2_INP,VREF_PVD_IN

GND

Ground

I/O

RF port (reserved), default RF

out by IPEX

GND

Ground

GND

Ground

SPI_CLK

I/O

Reserved PA5

SPI_CLK,leave it un-connect on

mainboard

SPI_MISO

I/O

Reserved PA6

SPI_MISO, leave it un-connect on

mainboard

SPI_MOSI

I/O

Reserved PA7

SPI_MOSI, leave it un-connect on

mainboard

MCU_NRST

I/O

MCU reset (STM32L071KBU6

NRST)

GND

Ground

VDD

DC3V3

Supply voltage 2.0~3.3V

Sleep Mode 1.5uA

Table 2 | Pin Definitions

2.5 Power Consumption

Current

Output Power

Frequency

868MHZ 19dBm 120mA on PA_BOOST

Receive Mode 15mA

Table 3 | Power Consumption

2.6 Recommended Circuit

RAK4200(H) module recommended circuit as below:

2.6.1 SWD programming Port

When programming with JLINK tool , it is need to connect 5 pins of 3V3,SWDIO,

SWCLK,GND and MCU_NRST. So it is better to leave these 5 pins for SWD

programming.

17 dBm 87mA on PA_BOOST

2.6.2 UART port

There are two UART ports on RAK4200(H) module. UART2(pin1 and pin2) is used

as a command port and UART1(pin4 and pin5) is used both as a command and an

upgrade port. So it is better to connect UART2 to external MCU and UART1 is used

as a debug or upgrade port.

2.6.3 I2C port

Pin9 and Pin10 are recommended as I2C port. Just pull up with 10K resistance if use

it.

2.6.4 RF port

There are two types of RF port. One is with Ipex connector and another is PAD type.

For Ipex type just connect the antenna to the Ipex connector on the module directly.

For PAD type you can design the antenna as Ipex or SMA or Spring type.

2.6.5 SPI port

The SPI (pin15 ,pin16,pin17) has connected to the SX1276 in the internal of the

module.

So it is better not to use these 3 pins and just leave it un-connect on the mainboard.

2.7 Mechanical Dimensions

The figure below shows the mechanical dimension of the RAK4200(H) LoRa Module.

Figure 4 | Mechanical Dimensions

2.8 Recommended Footprint

Figure 5 | Recommended Footprint

2.9 Recommended Reflow Profile

Figure 6 | Recommended Reflow Profile

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