EWM22A Series — BLE5.0 / Wi-Fi / LoRa All-in-One Wireless Module | Remote Configuration · Relay Networking · Ultra-Low Power
[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
[Introduction]：The 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.
| Absolute Maximum Ratings | Performance | Remark | |
| Minimum | Maximum | ||
| 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 | Performance | Remark | |||
| Min | Typical | Max | |||
| 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 | |
| Operating temperature (°C) | -40 | — | 85 | Industrial-grade design | |
| 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 | |
| Current | 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 |
| Dimensions | 14 × 20 mm | ±0.2mm tolerance |
| Weight | 1.2 g | ±0.1g |
Frequently Asked Questions
Q: Is the EWM22A compatible with standard LoRaWAN gateways?
A: The EWM22A uses Ebyte's private LoRa protocol (E22X-compatible) for P2P and relay networking. It does not natively support LoRaWAN (TTN/Helium/AWS) without a firmware upgrade. For LoRaWAN applications, consider the Ebyte E77 series (STM32WLE5, LoRaWAN 1.0.4/1.1).
Q: How do I configure the EWM22A module?
A: Configuration is done via AT commands over UART (TTL 3.3V). Ebyte provides a free USB configuration tool (RF Setting) for Windows. Parameters including frequency channel, air rate, TX power, and working mode are all configurable. Remote configuration is also supported via BLE or Wi-Fi.
Q: What certifications does the EWM22A hold?
A: The EWM22A series has passed CE (RED 2014/53/EU) and RoHS certification. FCC Part 15 certification is available for the 900MHz variant. Certification documents are available upon request for integration into end-product compliance submissions.
Q: Can BLE, Wi-Fi, and LoRa operate simultaneously?
A: The EWM22A supports flexible multi-protocol deployment. BLE and Wi-Fi share the 2.4GHz radio and can be used for local configuration or short-range data transfer, while LoRa handles long-range transmission. Simultaneous full-duplex operation across all three protocols depends on firmware mode; refer to the datasheet for mode switching details.
Q: What is the difference between EWM22A-400BWL22S and EWM22A-900BWL22S?
A: The 400 variant operates on 410–493MHz LoRa (CN433/EU433), while the 900 variant covers 850–930MHz (EU868/US915). Both share identical BLE 5.0 and Wi-Fi specs. Choose the 400 series for China/Asia deployments and the 900 series for EU/US markets.
