Product Introduction
868MHz and 915MHz LoRaWAN technology Module for IoT
WSL02-A0 LoRaWAN Module is a low cost, low power and ultra-small size module, embedded with Semtechs LoRa propriety chip SX1276 and STs ultra-low power STM32 serial MCU.
The module designed by Friendcom (Shenzhen) is targeted to application in sensor network and others IOT devices powered by battery which need low power consumption to extend the battery lifetime.
This datasheet will give some details of description of the module, including HW design info, performance validation, and application information.


Key Feature
Low power consumption:1.45uA sleep current in WOR mode
Ultra-small size:14mm X 20mm,18 pins SMT package
High performance:
WSL02-A0:TXOP=20dBm@868MHz/915MHz
160dB link budget, suitable for long range
User-friendly interface: USART/I2C/USB/ADC/GPIOs
Support standard LoRaWAN protocol
Regional band: EU868, US915 and US915Hybrid, CN779, AU915, AS923, KR920, IN865
Applications
The WSL02-A0 LoRaWAN Module is designed for end device which need long range and low power consumption, such as metering, sensor network, and others IoT application.

LoRaWAN sensor with WSL02-A0
WSL02-A0 is AT command LoRaWAN modem, which is LoRaWAN protocol embedded. Customer just need use a simple host MCU with application to control the modem via UART that a LoRaWAN sensor could be designed easily. This will help customer to promote their sensor devices to market quickly.

Simplified Block Diagram
Specifications
ITEMs
ParameterITEMs
Specifications
Unit
Structure
Size
14(W) X 20(L) X 2.6(H)
mm
Package
18 pins, SMT
Electrical Characteristics
power supply
3.3V type
V
Sleep current
1.45uA (WDT off)
uA
Operation current (Transmitter+MCU)
120mA @20dBm
mA
Operation current (Receiver+MCU)
16mA @BW125kHz
mA
Output power
max. 20dBm
dBm
Sensitivity
-139dBm @SF12, BW125kHz,
dBm
Harmonics
<-40dBm above 1GHz
dBm
Interface
RFIO
RF port
USART
2 group of USART, include 2pins
USB
1 group of USB, include 2 pins
I2C
1 group of I2C, include 2 pins
ADC
2 ADC Input, include 2 pins, reuse with LPUART port
NRST
Manual reset pin input
Dimension
The WSL02-A0 is available in an 18-pin SMT package as shown below:

Application in LoRaWAN
LoRaWAN networks typically are laid out in a star-of-stars topology in which gateways relay messages between end-devices and a central network server at the backend. Gateways are connected to the network server via standard IP connections while end devices use single-hop LoRa™ or FSK communication to one or many gateways. All communication is generally bi-directional, although uplink communication from an end device to the network server is expected to be the predominant traffic.
Communication between end-devices and gateways is spread out on different frequency channels and data rates. The selection of the data rate is a trade-off between communication range and message duration, communications with different data rates does not interfere with each other. LoRa data rates range from 0.3 kbps to 50 kbps, with different Band Width and Spreading Factor. To maximize both battery life of the end-devices and overall network capacity, the LoRa network infrastructure can manage the data rate and RF output for each end-device individually by means of an adaptive data rate (ADR) scheme.
End-devices may transmit on any channel available at any time, using any available data rate, as long as the following rules are respected:
1) The end-device changes channel in a pseudo-random fashion for every transmission. The resulting frequency diversity makes the system more robust to interferences.
2) The end-device respects the maximum transmit duty cycle relative to the sub-band used and local regulations.
The WSL02-A0 Module incorporates Semtechs LoRa Chip SX1276 and STs ultra-low power MCU. With only 1.45uA sleep current in WOR mode, the module is really very suitable for LoRaWAN application.
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