Data Sheet

Figure 18 Reference design based on LoRa-E5

6 LoRaWAN

application information

6.1 LoRaWAN

application

The topology of the LoRaWAN

network is a star network, and the gateway acts as a relay between nodes and

network servers. The gateway is connected to the network server through a standard IP link, and the node

device uses LoRa

or FSK to communicate with one or more gateways. Communication is bidirectional, although

it is mainly upstream communication from the node to the network server.

The communication between the node and the gateway uses different frequencies and rates. The choice of rate

is a compromise between power consumption and distance, and different rates do not interfere with each other.

According to different spreading factors and bandwidths, the rate of LoRa

can be from 300bps to 50Kbps. In

order to maximize battery life and network capacity, the network server manages the node's rate and output

power through rate adaptation (ADR).

The node device may transmit on a random channel at any time and at any rate, as long as the following

conditions are met:

1) The channel currently used by the node is pseudo-random. This makes the system more resistant to

interference

2) The maximum transmission time (dwell time of the channel) and duty cycle of the node depends on the

frequency band used and local regulations

LoRa-E5 module integrates ST ultra-low power IC STM32WLE5JC. The current is only 2.1uA in sleep mode, this

module is very suitable for various applications of LoRaWAN

6.2 Design LoRaWAN

wireless sensor based on LoRa-E5

LoRa-E5 is an AT instruction set that encapsulates the global LoRaWAN

standard protocol. The customer only

needs a very simple MCU as the main control, and can control the LoRa-E5 through the serial port, thereby

easily implementing the LoRaWAN

protocol. This helps customers quickly bring sensor products to the

LoRaWAN

market.