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LoRa-E5 LoRa Wireless Module - Powered by STM32WE5 Datasheet V1.0 © 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com Content Content................................................................................................................................................... 2 1 Introduction ...................................................................................................................................... - 3 1.1 Feature .......................................................................................................................................... 3 2 Description ........................................................................................................................................... 5 2.1 Pin definition .................................................................................................................................. 5 3 Electrical characteristics ......................................................................................................................... 6 3.1 Extreme working conditions ............................................................................................................. 6 3.2 Normal working conditions ............................................................................................................... 7 3.3 Module specifications ...................................................................................................................... 7 4 Typical RF performance test .................................................................................................................... 8 4.1 LoRa-E5-LF Performance Testing ....................................................................................................... 8 4.2 LoRa-E5-HF Performance Testing .................................................................................................... 11 5 Application information........................................................................................................................ 14 5.1 Package information ...................................................................................................................... 14 5.2 External interface of the module ..................................................................................................... 15 5.3 Reference design based on LoRa-E5 module ..................................................................................... 15 6 LoRaWAN® application information........................................................................................................ 16 6.1 LoRaWAN® application ................................................................................................................... 16 6.2 Design LoRaWAN® wireless sensor based on LoRa-E5......................................................................... 16 7 Ordering information ........................................................................................................................... 17 8 Reversion ........................................................................................................................................... 17 © 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 1 Introduction LoRa-E5 is a low-cost, ultra-low power, ultra-small size LoRaWAN® module designed by Seeed Technology Co., Ltd. The module uses ST system-level package chip STM32WLE5JC, embedded high-performance LoRa® chip SX126X and ultra-low power Consumption of MCU. The target application of this module is wireless sensor networks and other Internet of Things devices, especially battery-powered low power consumption and longdistance occasions. This specification mainly describes the hardware information, hardware performance and application information of the module. LoRa-E5 LoRaWAN® module is mainly suitable for long-distance, ultra-low-power applications such as wireless meter reading, sensor networks, and other low-power wide-area IoT scenarios. 1.1 Feature ➢ Low power consumption: as low as 2.1uA sleep current (WOR mode) ➢ ➢ ➢ low cost: Small size: 12mm X 12mm * 2.5mm 28 pins SMT High performance: ✓ LoRa-E5-LF ✓ TXOP=10dBm@434MHz ✓ TXOP=22dBm@470MHz ✓ LoRa-E5-HF: ✓ TXOP=22dBm@868/915MHz ✓ -136.5dBm sensitivity for SF12 with 125KHz BW 158dB link budget, suitable for long distance interface ✓ USART ➢ ➢ ➢ ✓ I2C ✓ ADC ✓ SWD Embedded LoRaWAN® protocol, AT command, support global LoRaWAN® frequency plan ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ EU868 US915 and US915 Hybrid CN779 AU915 CN470 and CN470 Prequel AS923 KR920 IN865 This product specification includes a detailed description of the LoRa-E5 module's performance and functions. For the latest firmware, product updates or errata, please contact Seeedstudio. © 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com - 3 - / 18 2 Description LoRa-E5 is embedded with high-performance STM32WLE5JC, which is very suitable for the design of various IoT nodes. Based on the development of the multi-mode high-performance SX126X chip, the LoRa-E5 module supports (G) FSK mode and LoRa®. 62.5kHz, 125kHz, 250kHz and 500kHz bandwidth can be used in LoRa® mode. Based on the powerful functions and rich peripherals of STM32WLE5JC, the module provides UART, I2C, SPI, ADC and GPIOs for users to choose according to the application. If you need to upgrade the built-in AT command firmware, please use the two-wire interface (UART) to complete the programming based on the boot mode; and customers can develop the software based on the internal MCU of the module to complete the program erasure and programming through SWD. LoRa-E5 currently contains two sub-models, LoRa-E5-LF (Single-core STM32WLE5JC + SX126X) and LoRa-E5-HF (Single-core STM32WLE5JC + SX126X), LoRa-E5-LF supports 22dBm @ LF band (470MHz); 10dBm @ LF band (434MHz); LoRa-E5-HF supports 22dBm @ HF band (868 / 915MHz). Figure 1 LoRa-E5 Schematic diagram 2.1 Pin definition Figure 2 LoRa-E5 Pin arrangement Table 1 LoRa-E5 pinout © 2008-2020 Seeed Technology Co., Ltd. All rights reserved. www.seeedstudio.com 5 / 18 Number Name Type Description 1 VCC - Supply voltage for the module 2 GND - Ground 3 PA13 I SWDIO of SWIM for program download 4 PA14 I/O SWCLK of SWIM for program download 5 PB15 I/O SCL of I2C2 from MCU 6 PA15 I/O SDA of I2C2 from MCU 7 PB4 I/O MCU GPIO 8 PB3 I/O MCU GPIO 9 PB7 I/O UART1_RX from MCU 10 PB6 I/O UART1_TX from MCU 11 PB5 I/O MCU GPIO 12 PC1 I/O MCU GPIO ；LPUART1_TX from MCU 13 PC0 I/O MCU GPIO ；LPUART1_RX from MCU 14 GND - 15 RFIO I/O 16 GND - 17 RST Reset trigger input for MCU 18 PA3 I/O I/O 19 PA2 I/O MCU GPIO；USART2_TX from MCU 20 PB10 I/O MCU GPIO 21 PA9 I/O MCU GPIO 22 GND - 23 PA0 I/O MCU GPIO 24 PB13 I/O SPI2_SCK from MCU; Boot pin(Active low) 25 PB9 I/O SPI2_NSS from MCU 26 PB14 I/O SPI2_MISO from MCU 27 PA10 I/O SPI2_MOSI from MCU 28 PB0 I/O Unavailable；Suspended treatment Ground RF input/output Ground MCU GPIO；USART2_RX from MCU Ground 3 Electrical characteristics 3.1 Extreme working conditions Reaching or exceeding the maximum ratings listed in the table below can cause equipment damage. Table 2 Absolute Maximum Ratings Item Description © 2008-2020 Seeed Technology Co., Ltd. All rights reserved. min www.seeedstudio.com max unit 6 / 18 VCCmr Supply voltage -0.3 +3.9 V Tmr Ambient temperature -40 +85 ℃ Pmr RF input power - +10 dBm 3.2 Normal working conditions Table 3 Recommended Operating Conditions Item Description min max unit VCCop Supply voltage +1.8 +3.6 V Top Ambient temperature -40 +85 ℃ Pop RF input power - +10 dBm 3.3 Module specifications Table 4 LoRa-E5 features ITEMs Structure Parameter Specifications Unit Size 12(W) X 12(L) X 2.5(H) mm Package 28 pins, SMT power supply 3.3V type V Sleep current 2.1uA (WDT on); uA Operation current (Transmitter+MCU) Operation current (Receiver+MCU) Electrical Characteristics 50mA @10dBm in 434MHz type 111mA @22dBm in 470MHz type mA 111mA @22dBm in 868MHz type 6.7mA @BW125kHz, 434MHz type 6.7mA @BW125kHz, 470MHz type mA 6.7mA @BW125kHz, 868MHz type 10dBm max @434MHz Output power 22dBm max @470MHz dBm 22dBm max @868MHz @SF12, BW125kHz Sensitivity Harmonics Interface Fr(MHz) min type max 434 - -134.5 -136 470 - -136.5 -137.5 868 - -135 -137 dBm