TUYA WRD2L User manual

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 1V1.0.0
1. Product Overview
WRD2L is a low-power embedded Wi-Fi module that Tuya has developed. It consists of a
highly integrated RF chip (RDA5981BM) and several peripheral components, with an
embedded Wi-Fi network protocol stack and robust library functions. WRD2L is
embedded with a low-power Arm Cortex-M4 MCU, 2 MB flash memory, and 384 KB static
random-access memory (SRAM), and has extensive peripherals.
WRD2L is an RTOS platform that integrates all function libraries of the Wi-Fi MAC and
TCP/IP protocols. You can develop embedded Wi-Fi products as required.
1.1 Features
Embedded low-power 32-bit CPU, which can also function as an application
processor
Dominant frequency: 160 MHz
Working voltage: 3.0 V to 3.6 V
Peripherals: five GPIOs and one universal asynchronous receiver/transmitter (UART)
Wi-Fi connectivity
802.11b/g/n
2.4 GHz WiFi
WPA and WPA2 security modes
Up to +20±3dBm output power
STA, AP, and STA+AP working modes
Smart and AP network configuration modes for Android and iOS devices
Onboard PCB antenna with a gain of 2.0 dBi
Tuya WRD2L Wi-Fi Module
No.: 0000000004
Date: 2019-07-26
Product
Manual
Version: 1.0.0
Global Intelligent Platform

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 2V1.0.0
Working temperature: –40°C to +105°C
1.2 Applications
Intelligent building
Smart household and home appliances
Smart socket and light
Industrial wireless control
Baby monitor
Network camera
Intelligent bus

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 3V1.0.0
Change History
No.
Date
Change Description
Version After Change
1
2019-09-20
This is the first release.
1.0.0

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 4V1.0.0
Contents
1. Product Overview........................................................................................................................ 1
1.1 Features.............................................................................................................................. 1
1.2 Applications........................................................................................................................ 2
2 Module Interfaces......................................................................................................................... 6
2.1 Dimensions and Footprint................................................................................................6
2.2 Interface Pin Definition..................................................................................................... 6
2.3 Test Pin Definition..............................................................................................................7
3. Electrical Parameters..................................................................................................................8
3.1 Absolute Electrical Parameters....................................................................................... 8
3.2 Electrical Conditions......................................................................................................... 8
3.3 RF Current Consumption................................................................................................. 9
3.4 Working Current.................................................................................................................9
4 RF Features.................................................................................................................................10
4.1 Basic RF Features.......................................................................................................... 10
4.2 TX Performance.............................................................................................................. 10
4.3 RX Performance.............................................................................................................. 11
5 Antenna Information................................................................................................................... 11
5.1 Antenna Type................................................................................................................... 11
5.2 Antenna Interference Reduction................................................................................... 11
6. Packaging Information and Production Instructions............................................................12
6.1 Mechanical Dimensions................................................................................................. 12
6.2 Recommended PCB Layout..........................................................................................13
6.3 Production Instructions...................................................................................................14
6.4 Recommended Oven Temperature Curve..................................................................16
6.5 Storage Conditions......................................................................................................... 17
7. MOQ and Packing Information................................................................................................17
8 Appendix: Statement..................................................................................................................18

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 5V1.0.0
Tables
Table 2-1 WRD2L interface pins....................................................................................................6
Table 2-2 WRD2L test pins.............................................................................................................7
Table 3-1 Absolute electrical parameters..................................................................................... 8
Table 3-2 Normal electrical conditions..........................................................................................8
Table 3-3 Current consumption during constant transmission and receiving........................9
Table 3-4 WRD2L working current................................................................................................ 9
Table 4-1 Basic RF features.........................................................................................................10
Table 4-2 Performance during constant transmission............................................................. 10
Table 4-3 RX sensitivity.................................................................................................................11
Figures
Figure 1-1 WRD2L architecture...................................................................错误！未定义书签。
Figure 2-1 WRD2L front and rear views.......................................................................................6
Figure 6-2 Side view......................................................................................................................12
Figure 6-3 WRD2L pins.................................................................................................................13
Figure 6-4 WRD2L pin header dimensions............................................................................... 13
Figure 6-5 Layout of the PCB to which WRD2L applies......................................................... 14
Figure 6-6 HIC for WRD2L........................................................................................................... 15
Figure 6-7 Oven temperature curve........................................................................................... 16

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 6V1.0.0
2 Module Interfaces
2.1 Dimensions and Footprint
WRD2L has two rows of pins with a 2±0.1 mm pin spacing.
The WRD2L dimensions (H x W x D) are 2.8±0.15 mm x 17.3±0.35 mm x 15±0.35 mm.
Figure 2-1 shows the WRD2L front and rear views.
Figure 2-1 WRD2L front and rear views
2.2 Interface Pin Definition
Table 2-1 WRD2L interface pins
Pin No.
Symbol
I/O Type
Function
1
GPIO25
P
Hardware PWM pin, which is connected to
GPIO25 (pin 31) on the internal IC
2
GPIO24
I/O
Hardware PWM pin, which is connected to
GPIO24 (pin 32) on the internal IC
3
GPIO3
I/O
Hardware PWM pin, which is connected to
GPIO3 (pin 23) on the internal IC

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 7V1.0.0
Pin No.
Symbol
I/O Type
Function
4
GPIO23
I/O
Hardware PWM pin, which is connected to
GPIO23 (pin 33) on the internal IC
5
GPIO22
I/O
Hardware PWM pin, which is connected to
GPIO22 (pin 34) on the internal IC
6
GND
P
Power supply reference ground pin
7
3V3
P
Power supply pin (3.3 V)
Note:
Pindicates power supply pins, and I/O indicates input/output pins.
2.3 Test Pin Definition
Table 2-2 WRD2L test pins
Pin No.
Symbol
I/O Type
Function
N/A
GND
P
Power supply reference ground pin
N/A
RST
Input
Hardware reset pin (It is at a high level by
default and is active at a low level.)
N/A
U_TX
I/O
UART_TX (user-side serial interface)
N/A
U_RX
I/O
UART_RX (user-side serial interface)
N/A
L_TX
I/O
Log TX pin
N/A
L_RX
I/O
Log RX pin
Note:
Test pins are not recommended.

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 8V1.0.0
3. Electrical Parameters
3.1 Absolute Electrical Parameters
Table 3-1 Absolute electrical parameters
Parameter
Description
Minimum
Value
Maximum
Value
Unit
Ts
Storage
temperature
–40
105
°C
VBAT
Power supply
voltage
3.0
3.6
V
Static electricity voltage
(human body model)
Tamb = 25°C
N/A
2
kV
Static electricity voltage
(machine model)
Tamb = 25°C
N/A
0.5
kV
3.2 Electrical Conditions
Table 3-2 Normal electrical conditions
Parameter
Description
Minimum
Value
Typical
Value
Maximum
Value
Unit
Ta
Working
temperature
–40
N/A
105
°C
VBAT
Power supply
voltage
3.0
3.3
3.6
V
VIL
I/O low-level
input
–0.3
N/A
VCC x 0.25
V
VIH
I/O high-level
input
VCC x 0.75
N/A
VCC
V
VOL
I/O low-level
output
N/A
N/A
VCC x 0.1
V

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 9V1.0.0
Parameter
Description
Minimum
Value
Typical
Value
Maximum
Value
Unit
VOH
I/O high-level
output
VCC x 0.8
N/A
VCC
V
Imax
I/O drive
current
N/A
N/A
12
mA
3.3 RF Current Consumption
Table 3-3 Current consumption during constant transmission and receiving
Working
Status
Parameter
Typical
Value
Maximum
Value
Unit
Mode
Rate
TX Power/
Receiving
TX
802.11b 11 Mbit/s 17±3 dBm 200 260 mA
802.11g 54 Mbit/s 20±3 dBm 170 215 mA
802.11n MCS7 20±3 dBm 166 200 mA
RX
802.11b
11 Mbit/s
Constant receiving
65
80
mA
802.11g
54 Mbit/s
Constant receiving
65
80
mA
802.11n
MCS7
Constant receiving
65
80
mA
3.4 Working Current
Table 3-4 WRD2L working current
Working
Mode
Working Status (Ta = 25°C)
Average
Value
Maximum
Value
Unit
EZ
The module is in EZ mode, and the
Wi-Fi indicator blinks quickly.
66
261
mA
AP
The module is in AP mode, and the
Wi-Fi indicator blinks slowly.
68
261
mA

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 10 V1.0.0
Working
Mode
Working Status (Ta = 25°C)
Average
Value
Maximum
Value
Unit
Connected
The module is connected to the
network, and the Wi-Fi indicator is
steady on.
68
264
mA
Disconnected
The module is disconnected from the
network, and the Wi-Fi indicator is
steady off.
14.5
18
mA
4 RF Features
4.1 Basic RF Features
Table 4-1 Basic RF features
Parameter Description
Frequency band 2.4GHz
Wi-Fi standard IEEE 802.11b/g/n
Data transmission rate
802.11b: 1, 2, 5.5, or 11 (Mbit/s)
802.11g: 6, 9, 12, 18, 24, 36, 48, or 54 (Mbit/s)
802.11n: HT20 MCS0 to MCS7
Antenna type
PCB antenna with a gain of 2.0 dBi
4.2 TX Performance
Table 4-2 Performance during constant transmission
Parameter
Minimum
Value
Typical
Value
Maximum
Value
Unit
Average RF output power,
802.11b CCK mode
11 Mbit/s
N/A
17
N/A
dBm

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 11 V1.0.0
Parameter
Minimum
Value
Typical
Value
Maximum
Value
Unit
Average RF output power,
802.11g OFDM mode
54 Mbit/s
N/A
13.5
N/A
dBm
Average RF output power,
802.11n OFDM mode
MCS7
N/A
12
N/A
dBm
Frequency error
–10
N/A
+10
ppm
4.3 RX Performance
Table 4-3 RX sensitivity
Parameter
Minimum
Value
Typical
Value
Maximum
Value
Unit
PER < 8%, 802.11b CCK
mode
11 Mbit/s
N/A
–83
N/A
dBm
PER < 10%, 802.11g
OFDM mode
54 Mbit/s
N/A
–72
N/A
dBm
PER < 10%, 802.11n
OFDM mode
MCS7
N/A
–70
N/A
dBm
5 Antenna Information
5.1 Antenna Type
WRD2L uses an onboard PCB antenna.
5.2 Antenna Interference Reduction
To ensure optimal Wi-Fi performance when the Wi-Fi module uses an onboard PCB
antenna, it is recommended that the antenna be at least 15 mm away from other metal
parts.

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 12 V1.0.0
To prevent adverse impact on the antenna radiation performance, avoid copper or traces
along the antenna area on the PCB.
For details about the onboard PCB antenna area on WRD2L, see Figure 6-1.
6. Packaging Information and Production Instructions
6.1 Mechanical Dimensions
The PCB dimensions (H x W x D) are 2.8±0.15 mm x 17.3±0.35 mm x 15±0.35 mm.
Figure 6-1 WRD2L PCB mechanical dimensions
Figure 6-2 Side view

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 13 V1.0.0
6.2 Recommended Pin figure
Figure 6-3 WRD2L pins
WRD2L can be mounted onto a PCB by using an SMT placement machine or connected
to the PCB through a pin header. Figure 6-4 shows the pin header dimensions.
Figure 6-4 WRD2L pin header dimensions

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 14 V1.0.0
Figure 6-5 Layout of the PCB to which WRD2L applies
6.3 Production Instructions
1. Use an SMT placement machine to mount the stamp hole module that Tuya produces
onto the PCB within 24 hours after the module is unpacked and the firmware is
burned. If not, vacuum pack the module again. Bake the module before mounting the
module onto the PCB.
(1) SMT placement equipment
i. Reflow soldering machine
ii. Automated optical inspection (AOI) equipment
iii. Nozzle with a 6 mm to 8 mm diameter
(2) Baking equipment
i. Cabinet oven
ii. Anti-static heat-resistant trays
iii. Anti-static heat-resistant gloves
2. Storage conditions for a delivered module are as follows:
(1) The moisture-proof bag is placed in an environment where the temperature is
below 30°C and the relative humidity is lower than 70%.

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 15 V1.0.0
(2) The shelf life of a dry-packaged product is six months from the date when the
product is packaged and sealed.
(3) The package contains a humidity indicator card (HIC).
Figure 6-6 HIC for WRD2L
3. Bake a module based on HIC status as follows when you unpack the module
package:
(1) If the 30%, 40%, and 50% circles are blue, bake the module for 2 consecutive
hours.
(2) If the 30% circle is pink, bake the module for 4 consecutive hours.
(3) If the 30% and 40% circles are pink, bake the module for 6 consecutive hours.
(4) If the 30%, 40%, and 50% circles are pink, bake the module for 12 consecutive
hours.
4. Baking settings:
(1) Baking temperature: 125±5°C
(2) Alarm temperature: 130°C
(3) SMT placement ready temperature after natural cooling: < 36°C
(4) Number of drying times: 1
(5) Rebaking condition: The module is not soldered within 12 hours after baking.
5. Do not use SMT to process modules that have been unpacked for over three months.
Electroless nickel immersion gold (ENIG) is used for the PCBs. If the solder pads are
exposed to the air for over three months, they will be oxidized severely and dry joints
or solder skips may occur. Tuya is not liable for such problems and consequences.
6. Before SMT placement, take electrostatic discharge (ESD) protective measures.
7. To reduce the reflow defect rate, draw 10% of the products for visual inspection and
AOI before first SMT placement to determine a proper oven temperature and
component placement method. Draw 5 to 10 modules every hour from subsequent

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 16 V1.0.0
batches for visual inspection and AOI.
6.4 Recommended Oven Temperature Curve
Perform SMT placement based on the following reflow oven temperature curve. The
highest temperature is 245°C.
Figure 6-7 Oven temperature curve

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 17 V1.0.0
6.5 Storage Conditions
7. MOQ and Packing Information
MOQ and packing information
Product
Model
MOQ
Packing
Method
Number of Modules
in Each Reel Pack
Number of Reel
Packs in Each Box
WRD2L
4000
Carrier tape
and reel
packing
1000
4

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 18 V1.0.0
8 Appendix: Statement
Federal Communications Commission (FCC) Declaration of Conformity
FCC Caution: Any changes or modifications not expressly approved by the party
responsible for compliance could void the user's authority to operate this 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.
This device and its antenna(s) must not be co-located or operating in conjunction with any
other antenna or transmitter.
15.105 Information to the user.
(b) For a Class B digital device or peripheral, the instructions furnished the user shall
include the following or similar statement, placed in a prominent location in the text of the
manual:
Note: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in
a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
—Reorient or relocate the receiving antenna.
—Increase the separation between the equipment and receiver.
—Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
—Consult the dealer or an experienced radio/TV technician for help.
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with minimum distance 20
cm between the radiator and your body.

WRD2L Datasheet
Hangzhou Tuya Information Technology Co., Ltd. 19 V1.0.0
Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment.
This transmitter must not be co-located or operating in conjunction with any other antenna
or transmitter.
The availability of some specific channels and/or operational frequency bands is country
dependent and firmware programmed at the factory to match the intended destination.
The firmware setting is not accessible by the end user.
The final end product must be labeled in a visible area with the following:
"Contains Transmitter Module 2ANDL-WRD2L"
This radio module must not be installed to co-locate and operating simultaneously with
other radios in host system, additional testing and equipment authorization may be
required to operating simultaneously with other radio.
Declaration of Conformity European notice
Hereby, Hangzhou Tuya Information Technology Co., Ltd. declares that this Wi-Fi module
product is in compliance with essential requirements and other relevant provisions of
Directive 2014/53/EC. A copy of the Declaration of conformity can be found at
https://www.tuya.com.
EN 300 328 V2.1.1
EN 301 489-1 V2.1.1; EN 301 489-17 V3.1.1
EN 62311:2008
EN 60950-1:2006+A11:2009+A1:2010+A12:2011+A2:2013