Hangzhou Tuya Information Technology WR3 Wi-Fi Module User Manual WR3 x

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Document ID	3943857
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Date Submitted	2018-07-30 00:00:00
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WR3 DATASHEET
TuyaSmartWi-Fi Module
1. Product Overview
WR3 is a low power consumption module with built-in Wi-Fi connectivity solution designed
by Hangzhou Tuya Information Technology Co.,Ltd. The Wi-Fi Module consists of a highly
integrated wireless radio chip W302 12E75M2 and some extra flash that has been programed with
Wi-Fi network protocol and plenty of software examples.WR3 includea ARM CM4F, WLAN
MAC, 1T1R WLAN, maximum frequency reaches 125MHz, 256K SRAM, 1M byte flash and
various peripheral resources.
WR3 is a RTOS platform, embedded with all the Wi-Fi MAC and TCP/IP protocol function
examples, users can customize their Wi-Fi product by using these software examples.
Figure 1 shows the block diagramof the WR3.
Figure 1. The block diagram of the WR3
1.1 Features





Integrated low power consumption 32-bit CPU, also known as application processor
Basic frequency of the CPU can support 125 MHz
Supply voltage: DC 3.3V
Peripherals: 7 GPIO channels, 2 UART, 1 ADC
Wi-Fi connectivity:
 802.11 B/G/N20/N40
 Channel 1 to 11 @ 2.4GHz
 Support WPA/WPA2
 +20.09dBm output power in 802.11b mode
WR3 DATASHEET


Support SmartConfig function for both Android and IOS devices
On-board PCB antenna

Operating temperature range: -20℃ to 105℃
1.2 Main ApplicationFields







Intelligent Building
Intelligent home, Intelligent household applications
Healthy devices
Industrial wireless control
Baby monitor
Webcam
Intelligent bus
WR3 DATASHEET
2. Dimensions and Footprint
2.1Dimensions
WR3 has 2 columns of Pins (2*8).The distance between each Pin is 1.5
mm. Size of WR3: 16mm(W)*24mm(L)*3.3mm(H)
Figure 2 shows the dimensions of WR3.
Figure 2.1. The dimensions of WR3
2.2 Pin Definition
Table 1 shows the generalpin attributes of WR3
Table 1. The typical pin definitionof WR3
PIN
NO.
NAME
TYP
DISCREPTION
NC
NC
GPIOA_2
I/O
GPIOA_22
WR3 DATASHEET
CHIP_EN
I/O
External reset singal(low level effects)
GPIOA_1
I/O
GPIOA_19
GPIOA_1
I/O
GPIOA_14, hardware PWM
GPIOA_1
I/O
GPIOA_15, hardware PWM
GPIOA_0
I/O
VD33
Supply voltage (3.3V)
GND
Ground
10
ADC
AI
ADC terminal(input 5V maximumly)
11
GPIOA_2
I/O
UART_Log_RXD (used to print module's internal information)
12
GPIOA_3
I/O
UART_Log_TXD(used to print module's internal information)
13
GPIOA_5
I/O
GPIOA_5, hardware PWM
14
GPIOA_1
I/O
GPIOA_12, hardware PWM
15
RXD
I/O
UART0_RXD
16
TXD
I/O
UART0_TXD
GPIOA_0,
can not be pull‐up while booting, can be used as GPIO
while in normal working mode
Note: S: Power supply pins; I/O: Digital input or output pins; AI: Analog input.
WR3 DATASHEET
3. Electrical Characteristics
3.1 Absolute Maximum Ratings
Table 3.1. Absolute Maximum Ratings
PARAMETERS
DESCRIPTION
MIN
MAX
UNIT
Ts
Storage temperature
‐20
105
℃
VCC
Supply voltage
3.0
3.6
Static electricity voltage
(human model)
TAMB‐25℃
‐
KV
Static electricity voltage
(machine model)
TAMB‐25℃
‐
0.5
KV
3.2 Electrical Conditions
Table 3.2. Electrical Conditions
PARAMETERS
DESCRIPTION
MIN
TYPICAL
MAX
UNIT
Ta
Working temperature
‐20
‐
105
℃
VCC
Working voltage
3.6
VIL
IO low level input
‐0.3
‐
VCC*0.25
VIH
IO high level input
VCC*0.75
‐
VCC
VOL
IO low level output
‐
‐
VCC*0.1
VoH
IO high level output
VCC*0.8
‐
VCC
Imax
IO drive current
‐
‐
16
mA
Cpad
Input capacitor
‐
‐
pF
3.3
3.3 Wi-Fi Transmitting Current Consumptions
Table 3.3. Wi-Fi TX current consumption
PARAMETERS
MODE
RATE
Transmitting power
TYPICAL
UNIT
IRF
11b
1Mbps
+20.09dBm
287
mA
IRF
11g
6Mbps
+20.06dBm
255
mA
IRF
11n HT20
MCS0
+19.99dBm
244
mA
IRF
11n HT40
MCS0
+19.76dBm
220
mA
WR3 DATASHEET
3.4 Wi-Fi Receiving CurrentConsumptions
Table 3.4. Wi-Fi RX currentconsumption
PARAMETERS
MODE
TYPICAL
UNIT
IRF
CPU sleep
90
mA
IRF
CPU active
120
mA
3.5 Working Mode CurrentConsumptions
Table 3.5. The module working currentconsumption
WORK MODE
AT TA=25℃
TYPICAL
MAX*
UNIT
EZ Mode
WR3 is under EZ paring mode, Wi‐Fi indicator
light flashes quickly
121.8
141
mA
Standby Mode
WR3 is connected, Wi‐Fi indicator light is on
52
125
mA
Operation Mode
WR3 is connected, Wi‐Fi indicator light is on
180
312
mA
Disconnection
Mode
WR3 is disconnected, Wi‐Fi indicator light is off
46
120
mA
Note: peak continuous time is about 5us.
The parameter shown above will vary dependingon different firmware functions.
4. WLAN Radio Specification
4.1 Basic Radio Frequency Characteristics
Table 41.Basic Radio frequency characteristics
PARAMETERS
DESCRIPTION
Frequency band
2.412GHz to 2.462GHz
Wi‐Fi standard
IEEE 802.11n20/g/b (Terminal 1‐11),802.11n40( Terminal 1-7)
11b:1,2,5.5,11(Mbps)
11g:6,9,12,18,24,36,48,54(Mbps)
Data transmitting rate
11n:HT20,MCS0~7
11n:HT40,MCS0~7
Antenna type
On‐board PCB Antenna
4.2Wi-Fi TransmittingPower
Table 4.2. Wi-Fi transmitting power
PARAMETERS
MIN
TYPICAL
MAX
UNI
WR3 DATASHEET
RF average output power, 802.11b CCK Mode
1M
‐
20.09
‐
dBm
RF average output power, 802.11g OFDM Mode
6M
‐
20.06
‐
dBm
RF average output power, 802.11n20 OFDM Mode
MCS0
‐
19.99
‐
dBm
RF average output power, 802.11n40 OFDM Mode
MCS0
‐
19.76
‐
dBm
‐10
‐
10
ppm
The Frequency error
4.3Wi-Fi Receiving Sensitivity
Table 4.3. Wi-Fi Receiving sensitivity
PARAMETERS
MIN
TYPICAL
MAX
UNI
PER<8%, Receiving sensitivity, 802.11b CCK Mode
1M
‐
‐91
‐
dBm
PER<10%, Receiving sensitivity, 802.11g OFDM Mode
6M
‐
‐75
‐
dBm
PER<10%, Receiving sensitivity, 802.11n OFDM Mode
MCS0
‐
‐72
‐
dBm
WR3 DATASHEET
5. Antenna Information
5.1 Antenna Type
Antenna connectedusing On-board PCB antenna.
5.2 Reduce Antenna Interference
While using the On-board PCBantenna, in order to have the best Wi-Fi performance, it’s
recommended to keep a minimum15mm distance between the antenna part and the other metal
pieces.
User’s own PCBA design is recommended NOT to pass any wire, NOT do copper pour under
the region of the module’s antenna, to avoid interferences.
WR3 DATASHEET
6. Packaging Information And Production Guide
6.1 Mechanical Dimensions
Figure 6.1. Top view of the module
Figure 6.2. The module’s mechanical view
6.2PCBRecommended Package
Figure 6.3. PCB schematic Drawing
WR3 DATASHEET
Figure 6.3. PCB footprint
6.3 Production Guide

The storage for the delivered module should meet the following condition:
WR3 DATASHEET
1. The anti-moisture bag should be kept in the environment withtemperature< 30℃ and
humidity< 85% RH.
2. The expiration date is 6 months since the dry packaging products was sealed.
 Cautions:
1. All the operators should wear electrostatic ringin the whole process of production.
2. While operating, water and dirt should not have any contact with the modules.
6.4 Recommended furnace temperature curve
Figure 6.4. PCB Package DrawingRecommended furnace temperature curve
FCC Statement
Any Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause
undesired operation.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment .This equipment should be installed and operated with
minimum distance 20cm between the radiator& your body.
FCC Label Instructions:
The outside of final products that contains this module device must display a label
referring to the enclosed module. This exterior label can use wording such as: “Contains
Transmitter Module FCC ID:2ANDL-WR3”,or “Contains FCC ID:2ANDL-WR3”, Any similar
wording that expresses the same meaning may be used.

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