TUYA WBR3N User manual

WBR3N User manual
1 Product Overview
WBR3N is a low-power embedded WiFi+BT module that Tuya has developed. It consists of a
highly integrated wireless RF chip (RTL8720CS), a few peripherals, an
embedded WiFi network protocol stack, the BT network protocol, and varied library
functions. WBR3N has an embedded low-power 32-bit CPU, 512 KB static randomaccess memory
(SRAM), 4 MB flash memory, and rich peripherals. WBR3N is an
RTOS platform that integrates all function libraries of the WiFi MAC and TCP/IP protocols. You can
develop embedded WiFi products as required.
1.1 Features
1. Embedded low-power 32-bit CPU, which can also function as an application
processor
2. The maxium clock rate: 200 MHz
3. Working voltage: 3.0 to 3.6 V
4. Peripherals: 8 GPIOs, 1 universal asynchronous receiver/transmitter (UART),
and 1 analog to digital converter (ADC)
5. WiFi connectivity
• 802.11b/g/n 1x1 2.4 G
• Channels 1 to 14 at 2.4 Ghz
• Support WPA and WPA2 security modes
• Up to +17.5 dBm output power in 802.11b mode
• Support STA/AP/STA+AP working modes
• Support SmartConfig and AP network configuration manners for Android
and iOS devices
• Onboard PCB antenna with a gain of 2.5 dBi at 2.4 G
• Working temperature: -20 to 85℃
6. BT/BLE connectivity
• Support BLE V5.0

• Up to the output power of +9 dbm The default output power is 7dB.
• PCB antenna with a gain of 2.5 dBi at 2.4 G shared with WiFi
• Working temperature: -20 to 85℃
1.2 Applications
• Intelligent building
• Smart household and home appliances
• Smart socket and light
• Industrial wireless control
• Baby monitor
• Network camera
• Intelligent bus
2. Electrical Parameters
2.1 Absolute Electrical Parameters

2.2 Normal Working Conditions
4 RF Parameters
4.1 Basic RF Features
5 Antenna Information
5.1 Antenna Type

WBR3N uses only an onboard PCB antenna.
5.2 Antenna Interference Reduction
To ensure optimal WiFi performance when the WiFi module uses an onboard PCB
antenna, it is recommended that the antenna be at least 15 mm away from other
metal parts. To ensure the antenna performance, the PCB should not be routed
or clad with copper in the antenna area. The main points of the layout: 1. Make
sure that there is no substrate medium directly below or above the printed antenna.
2. Make sure that the area around the printed antenna is far away from the metal
copper skin, so as to ensure the radiation effect of the antenna to the greatest
extent
6. Packaging Information and Production Instructions
6.1 Mechanical Dimensions
The WBR3N dimensions are 16mm (W)×24mm (L) ×3.0mm (H)
6.2 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
fifirmware is burned.If not, vacuum pack the module again. Bake the module
before mounting it onto the PCB. A. SMT placement equipment
• a) Reflflow soldering machine

17 / 237 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS
• b) Automated optical inspection (AOI) equipment
• c) Nozzle with a 6 mm to 8 mm diameter
B. Baking equipment - a) Cabinet oven - b) Anti-static heat-resistant trays - c)
Anti-static heat-resistant gloves
2. Storage conditions for a delivered module are as follows:
• The moisture-proof bag must be placed in an environment where the temper
ature is below 30°C and the relative humidity is lower than 70%.
• The shelf life of a dry-packaged product is 6 months from the date when the
product is packaged and sealed.
• The package contains a humidity indicator card (HIC).
3. Bake a module based on HIC status as follows when you unpack the module
package:
• A. If the 30%, 40%, and 50% circles are blue, bake the module for 2 consecutive
hours.
• B. If the 30% circle is pink, bake the module for 4 consecutive hours.
• C. If the 30% and 40% circles are pink, bake the module for 6 consecutive
hours.
• D. If the 30%, 40%, and 50% circles are blue, bake the module for 12 consec
utive hours.
4. Baking settings:
• A. Baking temperature: 125±5°C
• B. Baking time: 130°C
• C. SMT placement ready temperature after natural cooling: < 36°C
• D. The number of drying times: 1
• E. Rebaking condition: The module is not soldered within 12 hours after baking.
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5. Do not use SMT to process modules that have been unpacked for more than

3 months. Electroless nickel immersion gold (ENIG) is used for the PCBs. If
the solder pads are exposed to the air for more than 3 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 reflflow defect rate, draw 10% of the products for visual inspection
and AOI before the fifirst SMT placement to determine proper methods for con
trolling the oven temperature and attaching and placing components. Draw 5
to 10 modules from subsequent batches each hour for visual inspection and AOI.
6.3 Storage Conditions
7 Appendix-Statement
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.
Note: This equipment has been tested and found to comply 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.
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 and your body.
Important Note
This radio module must not installed to co-locate and operating simultaneously with
other radios in host system except in accordance with FCC multi-transmitter product
procedures. Additional testing and equipment authorization may be required to
operating simultaneously with other radio.
The availability of some specific channels and/or operational frequency bands are
country dependent and are firmware programmed at the factory to match the in
tended destination. The firmware setting is not accessible by the end user. The

host product manufacturer is responsible for compliance to any other FCC rules
that apply to the host not covered by the modular transmitter grant of certification.
The final host product still requires Part 15 Sub part B compliance testing with the
modular transmitter installed.
The end user manual shall include all required regulatory information/warning as
shown in this manual, including: This product must be installed and operated with a
minimum distance of 20 cm between the radiator and user body. This device have
got a FCC ID: 2ANDL-WBR3N. The final end product must be labeled in area with
the following: “Contains Transmitter Module FCC ID: 2ANDL-WBR3N”
This device is intended only for OEM integrators under the following conditions:
The antenna must be installed such that 20cm is maintained between the anantenna
and users, and 2) The transmitter module may not be co-located with any
other transmitter or antenna. As long as 2 conditions above are met, further transmitter
test will not be required. However, the OEM integrator is still responsible for
testing their end-product for any additional compliance requirements required with
this module installed
Declaration of Conformity European notice
Hereby, Hangzhou Tuya Information Technology Co., Ltd declares that this module
product is in compliance with essential requirements and other relevant provisions
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9 APPENDIX-STATEMENT
of Directive 2014/53/EU,2011/65/EU. A copy of the Declaration of conformity can be
found at https://www.tuya.com.
This product must not be disposed of as normal household waste, in accordance

with EU directive for waste electrical and electronic equipment (WEEE-2012/19/EU).
Instead, it should be disposed of by returning it to the point of sale, or to a municipal
recycling collection point. The device could be used with a separation distance
of 20cm to the human body。