The E77 Series is a highly integrated LoRaWAN node solution based on the STM32WLE5CCU6 SoC, offering ultra-low power consumption (3μA sleep) and dual-band options (433/470MHz or 868/915MHz) to satisfy global IoT deployment needs.
| Model | Frequency | Standard | Main IC | Interface | Best For 适用场景 |
|---|---|---|---|---|---|
| E77-400M22S | 410~510MHz | LoRaWAN 1.0.3 (EU433/CN470) | STM32WLE5CCU6 | UART (AT Command) | China/Europe 433MHz Monitoring |
| E77-900M22S | 850~930MHz | LoRaWAN 1.0.4 (Global) | STM32WLE5CCU6 | UART (AT Command) | Global LoRaWAN Networks (US/EU/AS) |
| E77-400MBL-01 | 410~510MHz | Evaluation Board | STM32WLE5CCU6 | USB to UART | Prototyping & Testing (433M) |
| E77-900MBL-01 | 850~930MHz | Evaluation Board | STM32WLE5CCU6 | USB to UART | Prototyping & Testing (900M) |
* Note: All modules support both ABP and OTAA network access methods.
Download Manual
Manual
【Demo】E77 Series LoRaWAN Demo(Passive crystal oscillator)
【AT】LoRaWAN AT commands for STM32CubeWL
【Product application】AN-2022013_E77 Series LoRaWAN Demo Instruction Manual
【Demo】E77 Series LoRaWAN Demo(Oscillator)
PCB
Company Profile
E77-400M22S LoRaWan node module UART interface AT command configuration Support LoRaWAN 1.0.3 EU433/CN470
[Chip solution]： STM32WLE5CCU6
[Carrier frequency]：410~510 MHz
[Transmit power]： 22dBm
[Communication distance]： 5600m
[Product size]： 14*20mm
[Product weight]：1.6g±0.1g
[Introduction]：E77-400M22S is a standard LoRaWan node module designed and produced by Ebyte, with an operating frequency band of 410~510MHZ, supports LoRaWAN 1.0.3 EU433/CN470 standards, supports CLASS-A/CLASS-C node types, and supports two network access methods: ABP/OTAA. At the same time, the LoRa module has a variety of low-power modes, and the external communication interface uses a standard UART. Users can access the standard LoRaWAN network through simple configuration of AT commands, which is an excellent choice for current IoT applications.
E77-900M22S UART interface LoraWan node module low power consumption support AT commands
[Chip solution]： STM32WLE5CCU6
[Carrier frequency]：868~930MHz
[Transmit power]： 22dBm
[Communication distance]： 5600m
[Product size]：14*20mm
[Product weight]：1.6g±0.1g
[Introduction]：E77-900M22S is a standard LoraWan node module developed by Ebyte. It supports LoRaWAN 1.0.4 EU868, US915, AU915, AS923, IN865, KR920, RU864 standards, CLASS-A/CLASS-C node types, and ABP/OTAA network access methods. At the same time, the module has a variety of low-power modes, and the external communication interface uses a standard UART. Users can access the standard LoRaWAN network through simple configuration of AT commands. It is an excellent choice for current IoT applications.
| RF Parameter | Value |
Remark |
| Working frequency |
850~930 MHz |
Support ISM band |
| Transmitting power | 0~21.5 dBm |
The software is adjustable, and users need to develop their own settings |
| Receiving sensitivity | -118 dBm |
GFSK，air speed1.2kbps |
| Reference distance(PCB/IPX) | 5600m |
Clear and open environment, maximum power, antenna gain 3.5dBi, height 2m, airspeed 1.2kbps |
| Hardware Parameter | Value |
Remark |
|
IC full name |
STM32WLE5CCU6 |
—— |
|
core |
Cortex-M4 |
—— |
|
FLASH |
256 KB |
—— |
|
RAM |
64 KB |
—— |
|
Crystal frequency |
32MHz/32.768KHz |
External crystal |
|
Size |
14 * 20 mm |
—— |
|
Antenna type |
IPEX/stamp hole |
Equivalent Impedance Approx.50Ω |
|
Communication interface |
UART、SPI、I²C、GPIO、ADC |
Users need to develop their own settings |
|
Packaging |
Patch stamp hole |
—— |
| Electronic parameter | Min. | Typ. | Max. | Unit | Condition |
| voltage | 1.8 | 3.3 | 3.6 | V |
≥3.3V Guaranteed output power Exceeding 3.6V will permanently burn the module |
|
communication level |
- |
3.3 |
- | V |
Using 5.0V TTL is recommended to add level conversion |
|
Emission current |
- | 128 | - | mA | Instantaneous power consumption |
| receive current | - | 14 | - | mA | —— |
| sleep current | - | 3 | - | μA | software shutdown |
|
Operating temperatur |
-40 | 20 | 85 | ℃ | - |
|
Working humidity |
10 | 60 | 90 | % | - |
|
Storage temperature |
-40 | 20 | 125 | ℃ | - |
Application Scenarios
-
Smart Utility Metering: The E77 series leverages the STM32WLE5's SoC architecture to reduce PCB footprint in water and gas meters. Its 22dBm output power ensures deep indoor penetration, allowing reliable data transmission from basement meters to outdoor gateways.
-
Industrial Sensor Networks: With a diverse range of interfaces including UART, SPI, and ADC, the E77 is perfect for monitoring factory equipment. It enables real-time reporting of vibration and temperature data via LoRaWAN 1.0.4, minimizing wiring costs in large-scale industrial plants.
-
Agricultural Environmental Monitoring: Designed for low power consumption, the E77 node can last for years on a small battery. It effectively covers 5.6km of farmland, transmitting soil moisture and weather data to optimize irrigation schedules without frequent maintenance.
FAQ
Q: How does the STM32WLE5 SoC in the E77 series improve energy efficiency compared to traditional two-chip solutions?
A: By integrating the LoRa radio and the Cortex-M4 MCU onto a single silicon die, the E77 series eliminates the power-hungry SPI bus communication between separate ICs. This reduces the wake-up time and the overall current consumption during active processing. Additionally, the module's 3uA sleep current is achieved through optimized internal power gating, making it superior for battery-operated long-term deployments.
Q: What are the power supply requirements to ensure a stable 22dBm output on the 433MHz or 915MHz bands?
A: To maintain the maximum 22dBm transmission power, the supply voltage must remain at or above 3.3V. During transmission, the instantaneous current can reach 128mA. It is essential to use a low-dropout regulator with a high ripple rejection ratio and place a 100uF tantalum capacitor near the VCC pin to prevent voltage dips that could lead to signal distortion or MCU brown-out resets.
Q: Can the E77 series be used for secondary development beyond the standard AT command firmware?
A: Yes, since the E77 is based on the STM32WLE5CCU6 with 256KB Flash and 64KB RAM, engineers can bypass the factory AT firmware and develop custom applications directly using the STM32 Cube ecosystem. This allows for the integration of custom sensors or proprietary protocols while still utilizing the built-in LoRaWAN stack for network connectivity.
Q: How should I handle antenna matching for the IPEX and stamp hole options provided by the E77?
A: The module is designed with a 50-ohm characteristic impedance at its RF output pins. For the stamp hole version, you must design a coplanar waveguide or microstrip line on your carrier PCB with calculated dimensions to match 50 ohms. For the IPEX version, ensure the pigtail cable is not coiled or placed near metallic shielding, as this can increase the Voltage Standing Wave Ratio and significantly reduce the effective 5.6km communication distance.
