RF-42UH module is a LoRa spread spectrum module, with operating frequency of 410 MHz ~ 525 MHz, based on the Semtech SX1278. It is a wireless transceiver module with 3.3 V TTL level output.
Low power consumption 3000 meters SX1278 UART 410 MHz ~ 525 MHz LoRa Module
RF-42UH module is a LoRa spread spectrum module, with operating frequency of 410 MHz ~ 525 MHz, based on the Semtech SX1278. It is a wireless transceiver module with 3.3 V TTL level output. RF-star LoRa module features with ultra-long range spread spectrum communication, concentrated power density, high interference immunity ability, confidentiality, and significantly lower current consumption. The communication interface of RF-42UH is UART.
Parameters of RF-42UH
Chipset | Semtech SX1278 | |
Supply Power Voltage | 3.3 V ~ 5.2 V, recommended to 5.0 V | |
UART Communication Level | 2.5 V ~ 3.6 V, typical: 3.3 V | |
Frequency | 410 MHz ~ 525 MHz, typical: 433 MHz | |
Transmit Power | +10.0 dBm ~ +20.0 dBm | |
Receiving Sensitivity | -148 dBm | |
Number of Channels | 116 | |
Default Channel | 23 (433 MHz) | |
Module Address Number | 65538 (default as 0) | |
Crystal | 32 MHz | |
Package | SMT Packaging | |
Dimension | 26.0 mm x 16.0 mm x (2.5 ± 0.1) mm | |
Antenna | Half-hole interface / IPEX connector | |
Operating Humidity | 10% RH ~ 90% RH (no condensation) | |
Storage Humidity | 10% RH ~ 90% RH (no condensation) | |
Operating Temperature | -40 ℃～ +85 ℃ | |
Storage Temperature | -45 ℃～ +90 ℃ | |
Data Interface Rate @ 3.3 V (TTL) | 1200 bps ~ 115200 bps, typical: 9600 bps | |
Air Rate | 0.3 kbps ~ 19.2 kbps (typical: 2.4 kbps) | |
Single Package Size | 196 byte | |
Cache Size | 512 byte | |
Transmission Distance | 3000 m (Test conditions: sunny weather, empty, +20 dBm, antenna gain of 5 dBi, height of above 2.5 m, air speed of 2.4 kbps) | |
Operating Current @ 5 V | Tx Current | 101 mA |
Rx Current | 15 mA | |
Sleep Current | 3.4 μA | |
Recommended Footprint
Pin Attributes
Pin Functions of RF-42UH
Pin | Name | Pin Type | Description |
1 | GND | - | Ground |
2 | S0 | I | Cooperate with S1 to determine the working mode. (Cannot be NC, need be grounded if not used.) |
3 | S1 | I | Cooperate with S0 to determine the working mode. (Cannot be NC, need be grounded if not used.) |
4 | RXD | I | UART RX signal |
5 | TXD | O | UART TX signal |
6 | EN | O | Pull the serial port high before sending data and pull low after sending. Timed wake-up pin, pull high when wake-up. Pull high when module sending data, pull low after sending. |
7 | VCC | - | Power supply: 3.3 V ~ 5.2 V. |
8 | GND | - | Ground |
9 | RES_MCU | I | Reset pin, NC. |
10 | GND | - | Ground, NC. |
11 | 3V3_MCU | I/O | VCC (Power supply pin when flash the firmware) |
12 | SWIM_MCU | I/O | SWIM pin of internal MCU |
13 | PB0 | I/O | NC |
14 | PB1 | I/O | NC |
15 | PB3 | I/O | NC |
16 | GND | - | Ground |
17 | GND | - | Ground |
18 | ANT | I/O | Antenna port |
19 | GND | - | Ground |
