EWM22A series is a compact SMD all-in-one wireless module developed by Ebyte, integrating BLE 5.0, Wi-Fi (802.11b/g/n), and LoRa into a single 14×20mm package. LoRa functionality is fully compatible with the Ebyte E22X series. Factory firmware pre-installed; configurable via AT commands over UART. Designed for industrial IoT, smart agriculture, utility metering, and multi-protocol sensor networks.
| Feature / Parameter | EWM22A-400BWL22S | EWM22A-900BWL22S | EWT22A-400BWL22S | EWT22A-900BWL22S |
| Product Type | SMD Wireless Module | SMD Wireless Module | Evaluation Board / Test Kit | Evaluation Board / Test Kit |
| LoRa Frequency | 410–493 MHz (433MHz) | 850–930 MHz (868/915MHz) | 410–493 MHz (433MHz) | 850–930 MHz (868/915MHz) |
| Target Region | Asia / Europe (EU433) | Americas / Europe (US915/EU868) | Asia / Europe (EU433) | Americas / Europe (US915/EU868) |
| BLE & Wi-Fi | 2.4 GHz | 2.4 GHz | 2.4 GHz | 2.4 GHz |
| Hardware Interface | UART (TTL 3.3V) | UART (TTL 3.3V) | USB & Extended Pin Headers | USB & Extended Pin Headers |
| Antenna Interface | IPEX + Stamp Hole | IPEX + Stamp Hole | SMA Connector | SMA Connector |
| Form Factor / Size | 14 × 20 mm Stamp-hole | 14 × 20 mm Stamp-hole | Plug-and-Play PCB | Plug-and-Play PCB |
| Primary Use Case | Mass Production & PCB Integration | Mass Production & PCB Integration | Rapid Prototyping & PC Testing |
Rapid Prototyping & PC Testing |
EWM22A PCB_Library
EWM22A upgrade tool
EWT22A Manual
EWT22A schemetics
Ebyte Company Profile
Product Overview
[Model]：EWM22A-400BWL22S (433MHz LoRa) & EWM22A-900BWL22S (868/915MHz LoRa)
[Communication Interface]：UART (TTL 3.3V)
[Frequency]：2.4GHz (BLE5.0 / Wi-Fi) + 410–493MHz or 850–930MHz (LoRa)
[Protocols]：BLE 5.0 · Wi-Fi IEEE 802.11b/g/n · LoRa (E22X-compatible)
[LoRa Range]：5 km (open field, 3.5dBi antenna, 2.4kbps air rate)
[BLE / Wi-Fi Range]：500 m (open field, 5.0dBi antenna)
[Size]：14 × 20 mm · SMD · 1.27mm stamp-hole pitch · 1.2 ± 0.1g
Technical Parameters & Specifications
| Absolute Maximum Ratings | |||
|---|---|---|---|
| Parameter | Minimum | Maximum | Remark |
| Power supply voltage (V) | 0 | 3.6 | Exceeding 3.6V will permanently damage the module |
| Blocking power (dBm) | — | 10 | Risk of damage reduced when used at close range |
| Operating temperature (°C) | -40 | 85 | Industrial grade |
| Main Parameters | ||||
|---|---|---|---|---|
| Parameter Name | Min | Typical | Max | Remark |
| Operating voltage (V) | 3.0 | 3.3 | 3.6 | ≥3.3V ensures rated output power |
| Communication level (V) | — | 3.3 | — | 5V TTL may damage the module |
| BLE/Wi-Fi frequency (GHz) | 2.400 | — | 2.480 | ISM band |
| LoRa frequency — 400 series (MHz) | 410.125 | 433.125 | 493.125 | CN433 / EU433 |
| LoRa air rate (kbps) | 2.4 | 62.5 | 62.5 | Configurable via AT command |
| TX current (mA) | — | 200 | — | Peak / instantaneous |
| RX current (mA) | — | 11 | — | — |
| Deep sleep current (μA) | — | 6.7 | — | Ultra-low power standby |
| BLE TX power (dBm) | -9 | 20 | 20 | Configurable |
| Wi-Fi TX power (dBm) | — | 20 | — | Fixed |
| LoRa TX power (dBm) | 10 | 22 | 22 | Configurable |
| Parameter | Value | Remark |
|---|---|---|
| BLE range | 500 m | Open field, 5.0dBi antenna, 2m height |
| Wi-Fi range | 500 m | Open field, 5.0dBi antenna, 2m height |
| LoRa range | 5 km | Open field, 3.5dBi antenna, 2m height, 2.4kbps |
| Protocols | BLE 5.0 / Wi-Fi / LoRa | BLE 5.0 · Wi-Fi 802.11b/g/n · LoRa (E22X-compatible) |
| Interface | UART | TTL 3.3V level; AT command configuration |
| Package | SMD | Stamp-hole, 1.27mm pitch, reflow solderable |
| LoRa packet length | 240 bytes | Configurable: 32 / 64 / 128 / 240 bytes |
| BLE MTU | 517 bytes | — |
| UART RX/TX buffer | 1024 bytes each | — |
| LoRa TX buffer | 2028 bytes | — |
| TCP TX buffer | 2048 bytes | — |
| Antenna interface | IPEX + Stamp Hole | ~50Ω equivalent impedance |
Technical Graphic Breakdown
Advanced Industry Application Scenarios
The versatile hardware architecture of the EWM22A series enables rapid deployment for C-end developers, independent makers, and system integrators across diverse harsh environments:
- Industrial Automation & Multi-Protocol Gateways: With its tiny 14×20mm SMD stamp-hole footprint and rigid industrial-grade build (-40 to +85°C), the EWM22A acts as a perfect data-bridge. Engineers can collect field PLC data via the 3.3V TTL UART interface, bridge local parameter checks via 500m BLE 5.0/Wi-Fi on a smartphone, and instantly transmit packets up to 240 bytes over a 5km LoRa wireless network to the central control room.
- Smart Agriculture & Battery-Operated Sensor Nodes: In remote soil monitoring and livestock tracking, power efficiency is vital. EWM22A’s remarkable 6.7μA deep sleep standby current prolongs battery lifespans for years. The dual-band radio allows local field configuration via 2.4GHz Wi-Fi/BLE using AT commands, while the Sub-GHz LoRa (433MHz/868MHz/915MHz) broadcasts data effortlessly across a 5km range.
- Utility Smart Metering & Relay Networking: For water or electricity meters trapped inside concrete structures, the EWM22A leverages its E22X-compatible private LoRa protocol to execute complex relay networking. Its maximum 22dBm configurable TX power and dual antenna design (IPEX + Stamp hole) guarantee absolute signal penetration through dense building obstacles.
Frequently Asked Technical Questions (FAQs)
Q1: Can the EWM22A module communicate directly with standard mainstream LoRaWAN gateways?
A: No. Out of the box, the EWM22A features factory firmware running Ebyte's private LoRa protocol (fully compatible with Ebyte E22X series) for point-to-point (P2P) and automatic relay networking. It does not support native LoRaWAN (such as TTN or Helium) without custom firmware modification. If your project specifically demands standard open-source LoRaWAN compliance, please browse our E77 series instead.
Q2: What will happen if I directly hook up a 5V MCU to the EWM22A's serial communication interface?
A: The hardware communication interface level of the EWM22A is strictly limited to TTL 3.3V. Direct exposure to a 5V TTL logic level from microcontrollers like classic Arduino UNO will result in permanent chip damage. For 5V system integration, you must add an external bidirectional logic level converter circuit to protect the RX/TX buffers.
Q3: How do the BLE 5.0, Wi-Fi, and LoRa radios operate simultaneously within a single 14×20mm chip layout?
A: The EWM22A implements a smart internal time-division multiplexing strategy. BLE 5.0 and Wi-Fi share the integrated 2.4GHz RF chain for localized short-range links, while the Sub-GHz circuit handles the independent 22dBm LoRa long-range pathway. You can flexibly toggle modes or adjust packet lengths up to 240 bytes smoothly using standard AT commands via the UART interface without protocol conflicts.
Q4: How can I safely achieve the advertised 5km maximum LoRa range in my outdoor setup?
A: The 5km range is recorded in ideal open-field conditions using a 3.5dBi antenna mounted 2m high, running at the lowest 2.4kbps LoRa air rate with the full 22dBm output power. To replicate this stability, ensure your operating voltage stays above 3.3V (as power dropping below 3.3V diminishes TX power), choose matching high-gain antennas via the 50Ω IPEX port, and minimize physical obstacles in the RF line-of-sight.
