RF-42SH module is a LoRa spread spectrum module which is capable of achieving significantly longer range than existing systems based on FSK or OOK modulation, with operating frequency of 410 MHz ~ 525 MHz, based on the Semtech SX1278. It is a wireless SPI transceiver module with 3.3 V TTL level output.
SPI 410MHz--525MHz 5000m transmitting distance SX1278 lora module for Long range Irrigation Systems
RF-42SH module is a LoRa spread spectrum module which is capable of achieving significantly longer range than existing systems based on FSK or OOK modulation, with operating frequency of 410 MHz ~ 525 MHz, based on the Semtech SX1278. It is a wireless SPI 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, which can provide significant advances in selectivity and blocking performance, further improving communication reliability. The communication interface of RF-42SH is SPI, therefore, the MCU driver or a dedicated SPI debug tool is recommended to use.
Parameters of RF-42SH
Chipset | Semtech SX1278 | |
Supply Power Voltage | 1.8 V ~ 3.6 V, recommended to 3.3 V | |
Frequency | 410 MHz ~ 525 MHz, typical: 433 MHz | |
Transmit Power | +2.0 dBm ~ +20.0 dBm | |
Receiving Sensitivity | -148 dBm | |
Communication Interface | SPI | |
SPI Communication Level | 3.3 V | |
Crystal | 32 MHz | |
Package | SMT Packaging | |
Dimension | 16.0 mm x 16.0 mm x (2.3 ± 0.1) mm | |
Module Package Mode | Half-hole interface | |
Operating Humidity | 10% RH ~ 90% RH (no condensation) | |
Storage Humidity | 10% RH ~ 90% RH (no condensation) | |
Operating Temperature | -40 ℃～ +85 ℃ | |
Storage Temperature | -45 ℃～ +90 ℃ | |
Transmission Distance | 5000 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) | |
Air Rate | @ LoRa | 0.018 kbps ~ 37.5 kbps |
@ (G)FSK | 1.2 kbps ~ 300 kbps | |
Operating Current @ 5 V | Tx Current | 101 mA @ 20 dBm |
Rx Current | 15.0 mA | |
Sleep Current | 1.8 μA | |
Recommended Footprint
Pin Attributes
Pin Functions of RF-42SH
Pin | Name | Chip Pin | Pin Type | Description |
1 | GND | GND | - | Ground |
2 | GND | GND | - | Ground |
3 | DIO5 | DIO5 | I/O | Digital I/O, software configured |
4 | DIO4 | DIO4 | I/O | Digital I/O, software configured |
5 | DIO3 | DIO3 | I/O | Digital I/O, software configured |
6 | DIO2 | DIO2 | I/O | Digital I/O, software configured |
7 | DIO1 | DIO1 | I/O | Digital I/O, software configured |
8 | DIO0 | DIO0 | I/O | Digital I/O, software configured |
9 | RES | NRESET | I/O | Reset trigger input |
10 | VCC | VCC | P | Power supply: 1.8 V to 3.7 V, recommended to 3.3 V |
11 | SCK | SCK | I | SPI clock input |
12 | MISO | MISO | O | SPI data output |
13 | MOSI | MOSI | I | SPI data input |
14 | NSS | NSS | I | Module chip select pin for starting SPI communication |
15 | TXEN | RXTX / RF_MOD | I | RF switch pin control, high in TX, low in RX. |
16 | RXEN | RXTX / RF_MOD | I | RF switch pin control, high in RX, low in TX. |
17 | GND | GND | - | Ground |
18 | RF | RF | O | Antenna port |
