The RF-AL42UHB2 is a general LoRa Wireless Communication Module, with integrated LoRa Radio Transceiver, LoRa Modem and an 8-Bit CISC MCU. The MCU uses an advanced STM 8-bit core, with 16 MHz operation frequency. The LoRa Radio Transceiver has continuous frequency coverage from 410 MHz to 525 MHz.
RF-star ASR6505 433MHz LoraWAN LinkWAN UART Lora module
The RF-AL42UHB2 is a general LoRa Wireless Communication Module, with integrated LoRa Radio Transceiver, LoRa Modem and an 8-Bit CISC MCU. The MCU uses an advanced STM 8-bit core, with 16 MHz operation frequency. The LoRa Radio Transceiver has continuous frequency coverage from 410 MHz to 525 MHz. The LoRa Modem supports LoRa modulation for LPWAN use cases and (G)FSK modulation for legacy use cases. The LoRa Wireless Communication module designed by ASR6505 provides ultra-long range and ultra-low power communication for LPWAN application.
The RF-AL42UHB2 can achieve a high sensitivity of over -140 dBm and the maximum transmit power is higher than +22 dBm. This makes it suitable to be used in long range LPWAN and have high efficiency. The total chip package is of very small size, with totally of 48 pins.
Parameters of RF-AL42UHB2
Chipset | ASR6505 (STM8L152 + SX1262) |
Supply Power Voltage | 1.8 V ~ 3.6 V, recommended to 3.3 V |
Frequency | 410 MHz ~ 525 MHz |
Maximum Transmit Power | +22 dBm |
Receiving Sensitivity (125 kHz Bandwidth, SF = 12, rate = 0.3 Kbps) | -140 dBm |
GPIO | 40 |
Crystal | 32 MHz, 32.768 KHz |
SRAM | 4 KB |
Flash | 64 KB |
EEPROM | 2 KB |
Package | SMT Packaging |
Interface | UART, I2C, SPI, SD, ADC |
Dimension | 18.3 mm x 18.3 mm |
Type of Antenna | Half hole Interface |
Operating Temperature | -40 ℃～ +85 ℃ |
Storage Temperature | -55 ℃～ +125 ℃ |
Operating Humidity | 5 ~ 95% (Non-Condensing) |
Storage Humidity | 10 ~ 95% (Non-Condensing) |
Power Consumption | Sleep mode: 2 μA (@ without RF Config Retention, without RTC) TX Current: 50 mA (@ 17 dBm) TX Current: 40 mA (@ 14 dBm) RX Current: 10 mA |
Recommended Footprint
Pin Attributes
Pin Diagram of RF-AL42UHB2
Pin NO. | Pin Name | P/G/I/O | Description |
1 | LCD_SEG2 / GPIO | I/O | LCD Segment pin 2 |
2 | UART_RX / GPIO | I | UART RX pin, wake up UART |
3 | UART_TX / GPIO | O | UART TX pin, wake up UART. |
4 | LCD_SEG3 / GPIO | I/O | LCD Segment pin 3 |
5 | LCD_COM3 / GPIO | I/O | LCD Common pin 3 |
6 | LCD_SEG4 / GPIO | I/O | LCD Segment pin 4 |
7 | LCD_SEG5 / GPIO | I/O | LCD Segment pin 5 |
8 | UART0_RX / GPIO | I | UART0 RX pin, wake up UART |
9 | UART0_TX / GPIO | O | UART0 TX pin, wake up UART |
10 | LCD_SEG6 / GPIO | I/O | LCD Segment pin 6 |
11 | LCD_SEG7 / GPIO | I/O | LCD Segment pin 7 |
12 | LCD_SEG8 / GPIO | I/O | LCD Segment pin 8 |
13 | LCD_SEG9 / GPIO | I/O | LCD Segment pin 9 |
14 | SPI1_MISO / GPIO | O | SPI slave output, can be external SPI |
15 | SPI1_MOSI / GPIO | I | SPI slave input, can be external SPI |
16 | SPI1_SCK / GPIO | I | SPI clock, can be external SPI |
17 | SPI1_NSS / GPIO | O | SPI slave select, can be external SPI |
18 | LCD_SEG10 / GPIO | I/O | LCD Segment pin 10 |
19 | LCD_SEG11 / GPIO | I/O | LCD Segment pin 11 |
20 | LCD_SEG12 / GPIO | I/O | LCD Segment pin 12 |
21 | LCD_SEG13 / GPIO | I/O | LCD Segment pin 13 |
22 | LCD_SEG14 / GPIO | I/O | LCD Segment pin 14 |
23 | LCD_SEG15 / GPIO | I/O | LCD Segment pin 15 |
24 | LCD_SEG16 / GPIO | I/O | LCD Segment pin 16 |
25 | GPIO0 | I/O | MCU GPIO |
26 | LCD_SEG17 / GPIO | I/O | LCD Segment pin 17 |
27 | I2C_SDA / GPIO | I/O | I2C SDA pin |
28 | I2C_SCL / GPIO | O | I2C SCL pin |
29 | ADC_IN0 / GPIO | I | ADC input pin0 |
30 | ADC_IN1 / GPIO | I | ADC input pin1 |
31 | GPIO2 | I | MCU GPIO |
32 | ADC_IN2 / GPIO | I/O | ADC input pin2 |
33 | GPIO3 | I/O | MCU GPIO |
34 | GPIO4 | I/O | MCU GPIO |
35 | GND | G | Ground |
36 | VDD | P | Supply for the LoRa Radio (1.8 V ~ 3.6 V) |
37 | GND | G | Ground |
38 | RF_OUT | O | RF transmitter output |
39 | GND | G | Ground |
40 | DIO3 | I/O | Multipurpose digital I/O-external TCXO32M supply voltage |
41 | SWIM | I/O | SWIM download pin |
42 | NRST | I/O | External reset pin |
43 | LCD_COM0 / GPIO | I/O | LCD Common pin 0 |
44 | LCD_COM1 / GPIO | I/O | LCD Common pin 1 |
45 | LCD_COM2 / GPIO | I/O | LCD Common pin 2 |
46 | V_LCD | I | VLCD voltage input |
47 | LCD_SEG0 / GPIO | I/O | LCD Segment pin 0 |
48 | LCD_SEG1 / GPIO | I/O | LCD Segment pin 1 |
