The E32-900M30S is a high-performance 1W (30dBm) LoRa module powered by the SX1276 chip, delivering an exceptional 10km long-range transmission in the 868/915MHz band, optimized for industrial-grade SPI hardware integration.
| Key Parameter | Specification |
|---|---|
| Model Number | E32-900M30S |
| Chip Solution | Semtech SX1276 |
| Frequency Range | 850 ~ 931 MHz (868/915MHz) |
| Transmit Power | 30 dBm (1 Watt) |
| Distance | 10 km |
| Interface | SPI |
| Package | SMD (24 * 38.5 mm) |
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| Main parameter | Description |
Remark |
| Reference distance |
10km |
Test condition：clear and open area, antenna gain: 5dBi，antenna height: 2m，air data rate: 2.4 kbps |
| FIFO |
256Byte |
Maximum length of single send |
| Crystal Oscillator |
32MHz |
Passive crystals |
| Protocol |
LoRa |
FSK/GFSK/MSK/GMSK/OOK |
| Package |
SMD |
Spacing of 2.54 mm |
| Interface |
2.54mm |
Sample hole |
| Communication interface |
SPI |
0～10Mbps |
| Size |
24 * 38.5 mm |
- |
| Antenna |
Sample hole / IPEX |
50 ohm impedance |
| Main parameter | Min | Type | Max | Unit | Remark |
| Operating voltage |
3.3 |
5 | 5.5 | V | ≥5.5 V ensures output power |
| Communication level |
- | 3.3 |
- | V |
- |
| Operating temperature |
-40 |
- | +85 |
℃ |
Industrial grade |
| Operating frequency |
850 |
868/915 |
931 |
MHz |
- |
| TX current |
- | 650 | - | mA |
- |
| RX current |
- | 19 |
- | mA |
- |
| Sleep current |
- | 2 | - | μA |
- |
| Max TX power |
- | 30 | - | dBm |
- |
| Receiving sensitivity |
-123 |
-124 |
-125 |
dBm |
Air data rate is 1.2 kbps |
Application
-
Smart Energy Management: In urban power grid monitoring, the E32-900M30S utilizes its 30dBm high-power output to penetrate complex building structures and concrete walls. It ensures stable data backhaul from electricity meters located in shielded basements to central concentrators over several kilometers.
-
Precision Agriculture: For expansive plantations, the 10km communication distance allows a single gateway to cover vast areas. The module enables long-term soil moisture and climate monitoring, solving the problem of high deployment costs associated with cellular networks in remote rural zones.
-
Industrial Wireless Sensing: In electromagnetically noisy factory environments, the LoRa spread spectrum technology of the SX1276 chip provides superior anti-interference. It allows reliable wireless reporting of vibration and temperature data from heavy rotating machinery without the need for expensive industrial cabling.
-
Oil & Gas Pipeline Safety: Designed for extreme conditions (-40 to +85°C), the module is ideal for monitoring pressure and leaks along remote pipelines. Its long-distance capability reduces the number of relay stations required, significantly lowering infrastructure maintenance costs.
FAQ
Q: What is the peak current requirement for the E32-900M30S during a 30dBm transmission burst?
A: When transmitting at full 30dBm power, the module draws approximately 650mA at a 5V supply. It is critical to use a power supply capable of providing at least 800mA to 1A of transient current. Any voltage dip below 4.5V during transmission can cause the internal RF circuit to become unstable or lead to a microcontroller brown-out reset.
Q: How does the SX1276 chip's sensitivity impact the effective range in 868MHz environments?
A: The SX1276 features a receiving sensitivity down to -125dBm at 1.2kbps. This high link budget, combined with the 30dBm output, provides a total link margin of over 155dB. This allows the signal to remain decodable even when the signal-to-noise ratio is well below the noise floor, ensuring the 10km range in open areas.
Q: Is the SPI interface of the E32-900M30S compatible with 5V microcontrollers?
A: While the module can be powered by up to 5.5V, the communication logic level (I/O) is typically 3.3V. If connecting to a 5V microcontroller, you must implement logic level shifters on the NSS, SCK, and MOSI lines. Direct 5V connection to these pins may cause excessive current leakage or permanent damage to the SX1276 silicon.
Q: What are the impedance considerations for the dual antenna interface (IPEX and Stamp Hole)?
A: Both the IPEX connector and the stamp hole pad are designed for a 50-ohm characteristic impedance. For the stamp hole version, the PCB trace on the carrier board must be designed as a microstrip or coplanar waveguide to match 50 ohms exactly. Any impedance mismatch will result in high VSWR, leading to power being reflected back into the power amplifier, which reduces range and increases heat dissipation.
