TUYA WR3L User manual

WR3LV1.0.0 User Manual
Version1.0.0
1. Product Overview
WR3L is a low power-consuming built-in Wi-Fi module developed by Hangzhou Tuya
Information Technology Co., Ltd. It consists of a highly integrated radio frequency chip
(RTL8710BX) and an external flash chip, with a built-in Wi-Fi network protocol stack and robust
library functions. WR3L also contains a low power-consuming ARM CM4F, a WLAN MAC, a
1T1R WLAN, and the maximum basic frequency of 125 MHz, and is embedded with a 256 KB
SRAM, a 2 MB flash, and robust peripheral resources.
WR3L is an RTOS platform that integrates all the function libraries of the Wi-Fi MAC and
TCP/IP protocols. You can develop built-in Wi-Fi products as required.
1.1 Features
Built-in low power-consuming 32-bit CPU functioning as an application processor
Basic frequency: 125 MHz
 Working voltage: 3 V to 3.6 V
 Peripherals: seven GPIOs, two UARTs, and one ADC
 Wi-Fi connectivity
802.11 B/G/N20/N40
Channels 1-11@2.4GHz
Supports WPA/WPA2 safe modes
SmartConfig mode (for Android and iOS devices)
Passing the CE, FCC, and SRRC certification
Working temperature: –20°C to +105°C
1.2 Major Application Fields
 Intelligent building
 Intelligent home and household appliances
 Healthcare
 Industrial wireless control
 Baby monitors
 Network camera
 Intelligent bus

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2. Module Interfaces
2.1 Dimensions and Pin Layout
WR3L provides two rows of pins (2 x 8) with the distance of 2 mm between every two pins.
WR3L dimensions: 16 mm (W) x 24 mm (L) x 3.3 mm (H) (see figure 2.1)
2.2 Pin definition
Table 2.1 describes the common pins.
Table 2.1，WR3L pins description
No. Symbol I/OType Function
1 NC / Disconnected to be compatible with other modules
2 GPIOA_22 I/O GPIOA_22
3 CHIP_EN I/O External enablement reset pin (valid at low level)
4 GPIOA_19 I/O GPIOA_19
5 GPIOA_14 I/O GPIOA_14, used for hardware PWM
6 GPIOA_15 I/O GPIOA_15, used for hardware PWM
7 GPIOA_0 I/O
GPIOA_0, which cannot be pulled up during
power-on and can be configured after power-on. It
is used for hardware PWM.

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8
VD33
P
Module power supply pin (3.3 V)
9
GND
P
Power supply reference ground pin
10
ADC
AI
ADC port, with the maximum input voltage of 5 V
11
GPIOA_29
I/O
UART_Log_RXD (used for printing the internal
information of the module)
12
GPIOA_30
I/O
UART_Log_TXD (used for printing the internal
information of the module)
13
GPIOA_5
I/O
GPIOA_5, used for hardware PWM
14
GPIOA_12
I/O
GPIOA_12, used for hardware PWM
15
RXD
I/O
UART0_RXD (user’s serial port)
16
TXD
I/O
UART0_TXD (user’s serial port)
Note: P indicates power-supply pins, I/O indicates input/output pins, and AI indicates
analog input pins.
3. Electrical Parameters
3.1 Absolute electrical parameters
Table 3.1,Absolute Parameters
Parameters
Description
Minimu
m value
Maximu
m value
Unit
Ts
Storage
temperature
–40
125
°C
VDD
Power-supply
voltage
–0.3
3.6
V
Static electricity voltage
(human model)
TAMB –
25°C
-
2
kV
Static electricity voltage
(machine model)
TAMB –
25°C
-
0.5
kV
3.2 Electrical Conditions
Table 3.2 Normal electrical conditions
Paramet
ers
Description
Min
Typ
Max
Unit
Ta
Working
temperature
–20
-
105
°C
VDD
Working voltage
3.0
3.3
3.6
V
VIL
I/O low-level input
–0.3
-
VDD x 0.25
V

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VIH
I/O high-level input
VDD x 0.75
-
3.6
V
VOL
I/O low-level output
-
-
VDD x 0.1
V
VOH
I/O high-level
output
VDD x 0.8
-
VDD
V
Imax
I/O drive current
-
-
16
mA
Cpad
Input pin
capacitance
-
2
-
pF
3.3 Wi-Fi TX power consumption
Table 3.3 TX power during constant emission
Symbol
Mode
Power
Typ
Unit
IRF
11b 11 Mbit/s
20.63 dBm
287
mA
IRF 11g 54 Mbit/s 22.2 dBm 255 mA
IRF 11n BW20 MCS7 21.27 dBm 244 mA
IRF 11n BW40 MCS7 20.82 dBm 230 mA
3.4 Wi-Fi RX power consumption
Table 3.4 RX power during constant receiving
Symbol Mode Typ Unit
IRF CPU sleep 90 mA
IRF CPU active 120 mA

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Table 3.5, Module operating current
Operation
Mode Operating condition, TA=25℃Typ Peak Unit
EZ mode The module is in the EZ state and the Wi-Fi
indicator fast flashes. 115 125 mA
Idle mode The module is in the connected state and the Wi-Fi
indicator is steady on. 60 209 mA
Working mode The module is in the connected state and the Wi-Fi
indicator is steady on. 118 198 mA
Disconnection
mode
The module is in the disconnected state and the
Wi-Fi indicator is steady off. 34 192 mA
Notes: The peak period is approx. 5us.
The preceding parameter values vary depending on the firmware functions.
4. RF Characteristics
4.1 Basic RF characteristics
Table 4.1,Basic RF characteristics
Parameter
Description
Frequency band
2.412 GHz to 2.462 GHz
Wi-Fi standard
IEEE 802.11b/g/n20/n40 (channels 1 to 11)
Data transmission
rate
11b: 1, 2, 5.5, 11 (Mbit/s) 11g: 6, 9, 12, 18, 24, 36, 48, 54
(Mbit/s) 11n: HT20 MCS0 to MCS7 11n: HT40 MCS0 to
MCS7
Antenna type
Onboard PCB antenna
3.5 Power consumption in operating mode

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4.2Wi-Fi RX sensitivity
Table 4.2,RX Sensitivity
Parameter Min Typ Max Unit
PER < 8%, RX sensitivity, 802.11b CCK mode 11
Mbit/s - –91 - dBm
PER < 10%, RX sensitivity, 802.11g OFDM mode 54
Mbit/s - –75 - dBm
PER < 10%, RX sensitivity, 802.11n OFDM mode MCS7 - –72 - dBm
5. Antenna Information
5.1 Antenna types
Only the onboard PCB antenna is used.
5.2 Antenna interference reduction
When using an onboard PCB antenna on a Wi-Fi module, make sure that the antenna on
the module is at least 15 mm away from other metal parts to ensure optimal wireless performance.
6. Packaging information and production guidance
6.1 Mechanical dimensions
Figure 6.1 Module dimensions

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6.2Production Instructions
Storage conditions of a delivered module are as follows:
1.The anti-moisture bag must be placed in an environment where the temperature is under
30°C and the relative humidity is under 85%.
2. The shelf life of a dry-packaged product is six months from the date when the product is
packaged and sealed.
Note:
1.Throughout the production process, each involved operator must wear an electrostatic
ring.
2. During the operation, strictly protect the module from water and strains.
6.3Recommended Oven Temperature Profile

Regulatory Module Integration Instructions
2.2 List of applicable FCC rules
This device complies with part 15.247 of the FCC Rules.
According to the definition of mobile and fixed device is described in Part 2.1091(b), this device is a
mobile device.
2.3 Summarize the specific operational use conditions
This module can be used in household electrical appliances as well as lighting
equipments. The input voltage to the module should be nominally 3.0 to 3.6V VDC ,typical
value 3.3VDC and the ambient temperature of the module should not exceed 105℃.
This module using only one kind of antennas with maximum gain is 2.5dBi .Other antenna
arrangement is not covered by this certification.
The antenna is not field replaceable. If the antenna needs to be changed, the certification
should be re-applied.
2.4 Limited module procedures
Not applicable
2.5 Trace antenna designs
Not applicable
2.6 RF exposure considerations
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. If the device built into a host as a portable usage,
the additional RF exposure evaluation may be required as specified by§ 2.1093.
This transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter. Country Code selection feature to be disabled for products marketed
to the US.
2.7 Antennas
Module only contains one PCB antenna. No additional external connectors.
WR3LV1.0.0 User Manual

2.8 Label and compliance information
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-WR3L ”,or “Contains FCC ID: 2ANDL-WR3L ”, Any
similar wording that expresses the same meaning may be used.
2.9 Information on test modes and additional testing requirements
a) The modular transmitter has been fully tested by the module grantee on the required
number of channels, modulation types, and modes, it should not be necessary for the
host installer to re-test all the available transmitter modes or settings. It is
recommended that the host product manufacturer, installing the modular transmitter,
perform some investigative measurements to confirm that the resulting composite
system does not exceed the spurious emissions limits or band edge limits (e.g., where a
different antenna may be causing additional emissions).
b) The testing should check for emissions that may occur due to the intermixing of
emissions with the other transmitters, digital circuitry, or due to physical properties of
the host product (enclosure). This investigation is especially important when integrating
multiple modular transmitters where the certification is based on testing each of them in
a stand-alone configuration. It is important to note that host product manufacturers
should not assume that because the modular transmitter is certified that they do not
have any responsibility for final product compliance.
c) If the investigation indicates a compliance concern the host product manufacturer is
obligated to mitigate the issue. Host products using a modular transmitter are subject to
WR3LV1.0.0 User Manual

all the applicable individual technical rules as well as to the general conditions of
operation in Sections 15.5, 15.15, and 15.29 to not cause interference. The operator of
the host product will be obligated to stop operating the device until the interference has
been corrected
Below are steps for on test modes：
tx_contin_en 1 // return：wifi tx continuous test!
wifitxout < parameter 1> < parameter 2> < parameter 3>
< parameter 1>：Send channel option and allowed number is 1~11.
< parameter 2>：Send data rate option, the relationship between input parameters and
rates is shown in table 1.
< parameter 3>：Send power attenuation
Table 1: allowed input for speed of receiving or sending data package
11b mode 11g mode 11n mode
Input Dial Speed Input Dial Speed Input Dial Speed
0x0 1M 0xb 6M 0x10 6.5M / MCS0
0x1 2M 0xf 9M 0x11 13M / MCS1
0x2 5.5M 0xa 12M 0x12 19.5M / MCS2
WR3LV1.0.0 User Manual

0x3 11M 0xe 18M 0x13 26M / MCS3
0x9 24M 0x14 39M / MCS4
0xd 36M 0x15 52M / MCS5
0x8 48M 0x16 58.5M / MCS6
0xc 54M 0x17 65M / MCS7
cmdstop // Stop sending data package command
2.10 Additional testing, Part 15 subpart B disclaimer
The final host / module combination need to be evaluated against the FCC Part 15B
criteria for unintentional radiators in order to be properly authorized for operation as a Part
15 digital device.
The host integrator installing this module into their product must ensure that the final
composite product complies with the FCC requirements by a technical assessment or
evaluation to the FCC rules, including the transmitter operation and should refer to
guidance in KDB 996369.
Frequency spectrum to be investigated
For host products with certified modular transmitter, the frequency range of investigation
of the composite system is specified by rule in Sections 15.33(a)(1) through (a)(3), or the
range applicable to the digital device, as shown in Section 15.33(b)(1), whichever is the
higher frequency range of investigation.
WR3LV1.0.0 User Manual

Operating the host product
When testing the host product, all the transmitters must be operating.The transmitters can
be enabled by using publicly-available drivers and turned on, so the transmitters are
active. In certain conditions it might be appropriate to use a technology-specific call box
(test set) where accessory devices or drivers are not available.
When testing for emissions from the unintentional radiator, the transmitter shall be placed
in the receive mode or idle mode, if possible. If receive mode only is not possible then, the
radio shall be passive (preferred) and/or active scanning. In these cases, this would need
to enable activity on the communication BUS (i.e., PCIe, SDIO, USB) to ensure the
unintentional radiator circuitry is enabled. Testing laboratories may need to add
attenuation or filters depending on the signal strength of any active beacons (if applicable)
from the enabled radio(s). See ANSI C63.4, ANSI C63.10 and ANSI C63.26 for further
general testing details.
The product under test is set into a link/association with a partnering WLAN device, as per
the normal intended use of the product. To ease testing, the product under test is set to
transmit at a high duty cycle, such as by sending a file or streaming some media content.
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.
WR3LV1.0.0 User Manual