Grove – LoRa-E5 (STM32WLE5JC), EU868/US915, LoRaWAN supported

Grove LoRa-E5 embedded with LoRa-E5 STM32WLE5JC, powered by ARM Cortex M4 ultra-low-power MCU core and LoRa SX126x, is an easy-to-use wireless radio module, supporting LoRaWAN protocol on the EU868 & US915 frequency and (G)FSK, BPSK, (G)MSK, LoRa modulations.

Features

•     LoRa-E5 (STM32WLE5JC) embedded
•     Support LoRaWAN protocol on EU868/US915 frequency band
•     Ultra-long transmitting range up to 10km (Ideal value in open space)
•     Easy control by AT command via UART connection
•     Rapid prototyping with plug-and-play Grove interfaces
•     Ultra-low power consumption and high performance

As an upgrade of our old version – Grove – LoRa Radio – powered by RFM95 ultra-long-range Transceiver Module, Grove LoRa-E5 embedded with LoRa-E5 STM32WLE5JC Module is a high-performance and easy-to-use wireless radio LoRa module supporting LoRaWAN protocol.

LoRa-E5 LoRaWAN STM32WLE5JC module is the major functional part integrated into Grove – LoRa-E5. It is a LoRaWAN module that embedded with ARM Cortex M4 ultra-low-power MCU core and LoRa SX126x, as the world-first combo of LoRa RF and MCU chip into one single tiny module, it supports (G)FSK, BPSK, (G)MSK, and LoRa modulations, and is FCC, CE certified. Grove – LoRa-E5 features extremely compacted size, ultra-low power consumption, low cost, and amazing performance. (Learn more about LoRa-E5)

Application Note

For more detailed information about how to use LoRa-E5, please visit LoRa-E5 (STM32WLE5JC) Module Wiki.

 1. Factory AT Firmware

LoRa-E5 series has a built-in AT command firmware, which supports LoRaWAN Class A/B/C protocol and a wide frequency plan: EU868/US915/AU915/AS923/KR920/IN865. With this AT command firmware, users can easily and quickly build their prototype or application.

The AT command firmware contains a bootloader for DFU and the AT application. The “PB13/SPI_SCK/BOOT” pin is used to control LoRa-E5 to stay in the bootloader or jump to the AT application. When PB13 is HIGH, the module will jump to AT application after reset, with a default baud rate of 9600. When PB13 is LOW (press the “Boot” button on LoRa-E5 Dev Board or LoRa-E5 mini), the module will stay in the bootloader, and keep transmitting “C” character every 1S at baud rate 115200.

Attention

1. Factory AT Firmware is programmed with RDP(Read Protection) Level 1, developers need to remove RDP first with STM32Cube Programmer. Note that regression RDP to level 0 will cause a flash memory mass to erase and the Factory AT Firmware can’t be restored again.

2. The “PB13/SPI_SCK/BOOT” pin on the LoRa-E5 module is just a normal GPIO, not the “BOOT0” pin of the MCU. This “PB13/SPI_SCK/BOOT” pin is used in the bootloader of the Factory AT firmware, to decide to jump to APP or stay in bootloader(for DFU). The real “BOOT0” pin doesn’t pinout to the module, so developers need to be careful when developing low-power applications.

2. Clock Configuration
    2.1 HSE
       32MHz TCXO
       TCXO power supply: PB0-VDD_TCXO
    2.2 LSE
       32.768KHz crystal oscillator
3. RF Switch

LoRa-E5 module ONLY transmits through RFO_HP:
    Receive: PA4=1, PA5=0
    Transmit(high output power, SMPS mode): PA4=0, PA5=1

Specifications
General Parameters
Voltage Supply:      3.3V / 5V
Power Output:      Up to +20 dBm at 3.3V
Working Frequency     868MHz / 915MHz
Protocol     LoRaWAN
Sensitivity     -116.5dBm ~ -136dBm
Modulation     LoRa, (G)FSK, (G)MSK and BPSK
Current     Only 60uA in sleep mode
Size     20*40mm
Working Temperature     -40℃ ~ 85℃

Part List:
Grove – LoRa-E5 PCBA *1
Grove Universal Cable *1