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WT801LP

LoRaWAN Compatible

RF Module with UART interface

WT801LP is a highly integrated low-power and half-duplex RF transceiver

module embedding high-speed and low-power MCU, and high-performance RF chip

with LORA modulation which is capable of achieving significant longer range than

existing RF transceiver of FSK or OOK modulation. WT801LP totally supports

LoRaWAN class-A protocol.

This module uses LoRa modulation to improve the sensitivity up to -137dBm,

significantly extending the transmission distance under the low power. By LoRaWAN

protocols, the start network could solve the problem of collision and low power

consumption through the gateway solution.

WT801LP module’s interface voltage is 2.6-3.6 V with consuming only 13 mA

at the receiving mode. If there is no packet to transmit, the module consumption is

only 1.3uA which is very suitable for a battery-powered system.

Using the WT 801LP module in an application minimizes the need or an

expensive and time-consuming RF development. Fast responding to market is

possible with this pre-qualified module.

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WT

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Apply

Wireless water/heat/gas meter reading

Wireless sensor

Intelligent instrument and meter

Intelligent lighting control

Auto data collection

Remote control and sensing

Smart building and security

Robot control

Power system monitoring

Wireless warehousing, logistics

management

Feature

LoRaWAN class-A compatibility

Global unique 64-bit identifier

4 bands and 16 channels support

Transmission distance > 5000 m

Frequency 862MHz to 1020MHz

High sensitivity up to -137dBm

Maximum transmission power 20dBm

Low sleep current 1.3uA

Receiving mode current 13mA

Super small size 34.5mm*20mm*6mm

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Catalog

1. Module Overview ............................................................................................................................................. 4

2. LoRa Modulation Technique ............................................................................................................................ 5

3. Global Electrical Characteristic ............................................................................................................................ 6

4. Module Package ............................................................................................................................................... 7

4.1 Pin Definition ..................................................................................................................... 7

4.2 Module Dimension ............................................................................................................. 8

5. Typical Application Schematic ............................................................................................................................. 8

6. Other ..................................................................................................................................................................... 9

6.1 Common Problem ............................................................................................................... 9

6.2 Contact .............................................................................................................................. 10

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1. Module Overview

The WT801LP is an ultra-long range, high-performance module for wireless communication.

It operates in the license free frequency band.

The WT801LP uses Semtech patented LoRa modulation technique, which combines spread

spectrum modulation and forward error correction techniques to increase the range and robustness

of radio communication links compared with traditional FSK or OOK based modulation. Typical

examples of WT801LP receiving performances are given in the following table.

Signal Bandwidth/[kHz] Spreading Factor Sensitivity/[dBm]

125 7 -123

125 12 -138

250 7 -121

250 12 -135

500 7 -116

500 12 -130

The WT801LP module has UART interface and could be easily mounted on a simple carrier

board with a minimum of required external connections. The wide range of capabilities could be

tested by using the EVB board form Wireless-Tag and the software of LoRaWANConfiger.

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2. LoRa Modulation Technique

The WT801LP uses Semtech LoRa proprietary spread spectrum modulation technique. This

modulation, in contrast to conventional modulation techniques, permits an increase in link budget

and increased immunity to in-band interference. LoRa also provides significant advantages in both

blocking and selectivity, solving the traditional design compromise between range, interference

immunity and energy consumption.

In LoRa mode, the WT801LP offers 125 kHz bandwidth with spreading factors from 7 to 12.

The spread spectrum LoRa modulation is performed by representing each bit of payload

information by multiple chips of information. The rate at which the spread information is sent is

referred to as the symbol rate (Rs), the ratio between the nominal symbol rate and chip rate is the

spreading factor and represents the number of symbols sent per bit of information. Parameters

which could be configured are given in the following tables.

Note that the spreading factor must be known in advance on both transmit and receive sides of

the radio link as different spreading factors are orthogonal to each other. Note also the resulting

signal to noise ratio (SNR) required at the receiver input. It is the capability to receive signals with

negative SNR that increases the sensitivity, so link budget and range, of the LoRa receiver.

Spreading Factor Chips/Symbol SNR/[dB]

7 128 -7.5

8 256 -10

9 512 -12.5

10 1024 -15

11 2048 -17.5

12 4096 -20

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3. Global Electrical Characteristic

Radio Frequency 862~1020M

Step Frequency 1KHz

Transmission Power 5~20dBm,

Receiving Sensitivity -137dBm@292bps

Air Transfer Rate 292bps~5.4Kbps

Interface Baud Rate 9600bps（+-3% Full temperature）

Interface Detection Way 8N1/8E1/8O1

Interface Buffer Space Double 180Bytes

Working Humidity 10%～90% (no condensation)

Working Temperature -45℃ ~ 85℃

The power Supply 2.6 ~ 3.6V

Transmission Current (typical) 120mA@100mW

Harmonic Suppression ≤1GHz：< -36dBm, ＞1GHz：< -30dBm

CAD/ Receives Current(typical) 13mA

Sleep Current(typical) 1.3uA

Size 34.5mm x 20.0mm x 6.0mm

Antenna Impedance 50Ω

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4. Module Package

4.1 Pin Definition

WT801LP module has nine pins; specific definitions are as the following table:

Pin Name Direction State

1 GND - Ground, 0V

2 VCC - 2.6~3.6V

3 SETA - Reserved, please keep it floating

4 RXD Input（weak pull-up） Pull up resistors UART input port, the

TTL level, about 47kΩ

5 TXD output UART output, TTL level

6 AUX output Reserved, Please keep it Floating

7 SETB - Reserved, Please keep it Floating

8 NC - Grounding/Reserved

9 NC - Grounding/reserved

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4.2 Module Dimension

5. Typical Application Schematic

3 4. 5 mm

6

5

20

mm

9

2.5

4 m

m

4

RFI CM CU

2.3

mm

C ry stal

2

3

7

1.3 m m

8

2.5

4 m

m

2.5

4 m

m

4.5

mm

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6. Other

6.1 Common Problem

No Communication

Between g Modules

1．Different parameters between two modules, such as: baud rate

2．Different radio frequency or air baud rate

3．Different product series

4．Abnormal power supply

5．Module Damaged

6．Module mode setting error

7．Out of communication range or incorrect antenna connection

Close Transmission

Distance

1．Over voltage range

2．Too big power supply ripple

3．Incorrect antenna connection or type

4．Too closed between antenna and metal surface or too small area

with module grounding

5．Terrible condition, such as dense buildings