WBR2 Module Datasheet

Last Updated on : 2020-08-10 01:49:08download

Product Overview

WBR2 is a low-power embedded WiFi+BLE module that Tuya has developed. It consists of a highly integrated wireless RF chip (RTL8720CF), with an embedded WiFi network protocol stack and varied library functions. With the maximum CPU clock rate of 100MHz, WBR2 also contains a low-power KM4 microcontroller unit (MCU), a WLAN MAC, a 1T1R WLAN module, 256 KB static random-access memory (SRAM), 2 MB flash memory, and extensive peripherals. WBR2 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. Embedded low-power KM4 MCU, which can also function as an application processor; Clock rate: 100MHz
  2. Working voltage: 3.0 to 3.6V
  3. Peripherals: 6 GPIOs and 1 universal asynchronous receiver/transmitter (UART)
  4. WiFi/BT connectivity

    • 802.11 B/G/N20
    • Channels 1 to 14 at 2.4 Ghz (channels 1 to 11 for US/CA and channels 1 to 13 for EU/CN)
    • Support BLE (Bluetooth Low Energy) 4.2
    • Support WEP/WPA/WPA2/WPA2 PSK(AES) security modes
    • Up to +20 dBm output power in 802.11b mode
    • Support SmartConfig functions for Android and iOS devices
    • Onboard PCB antenna
    • Passed CE and FCC certification
    • Working temperature: -20 to 85℃


  • Intelligent building
  • Smart household and home appliances
  • Smart socket and light
  • Industrial wireless control
  • Baby monitor
  • Network camera
  • Intelligent bus

Change History

Serial NumberUpdate DateUpdated ContentVersion after Update
110/28/2019This is the first release.V1.0.0

Module Interfaces

Dimensions and Footprint

WBR2 has two rows of pins with a 2mm pin spacing. The WBR2 dimensions are 15±0.35 mm (W)×18±0.35 mm (L) ×2.9±0.15 mm (H). The dimensions of WBR2 are as follows: WBR2 Module Datasheet

Pin Definition

The definition of interface pins is shown in the following table:

Pin NumberSymbolIO TypeFunction
13V3/Power supply pin (3.3V)
2A19I/OGPIOA_19, hardware PWM, IC Pin40
3GNDPPower supply reference ground
4A18I/OGPIOA_18, hardware PWM, IC Pin39
5A13I/OGPIOA_13, UART0_RXD, which is used as a user-side serial interface pin
6A17I/OGPIOA_17, hardware PWM, IC Pin38
7A14I/OGPIOA_14, UART0_TXD, which is used as a user-side serial interface pin
8A20I/OGPIOA_20, common GPIO, IC Pin1
9A12I/OGPIOA_12, hardware PWM, IC Pin26
10ENI/OEnabling pin, which works at the high level and is pulled up and controlled by a user externally
11A11I/OGPIOA_11, hardware PWM, IC Pin25

Note: P indicates power supply pins and I/O indicates input/output pins.

Electrical Parameters

Absolute Electrical Parameters

ParameterDescriptionMinimum ValueMaximum ValueUnit
TsStorage temperature-40105
VDDPower supply voltage-0.33.6V
Static electricity voltage (human body model)TAMB-25℃-2KV
Static electricity voltage (machine model)TAMB-25℃-0.5KV

Working Conditions

ParameterDescriptionMinimum ValueTypical ValueMaximum ValueUnit
TaWorking temperature-20-85
VDDWorking voltage3.0-3.6V
VILI/O low-level input--0.8V
VIHI/O high-level input2.0--V
VOLI/O low-level output--0.4V
VOHI/O high-level output2.4--V
ImaxI/O drive current--16mA
CpadInput pin capacitance-2-pF

RF Power Consumption

  1. TX power consumption:
SymbolModePowerAverage ValuePeak Value (Typical Value)Unit
IRF11b 11Mbps17 dBm217268mA
IRF11b 11Mbps18 dBm231283mA
IRF11g 54Mbps15 dBm159188mA
IRF11g 54Mbps17.5 dBm177213mA
IRF11n BW20 MCS713 dBm145167mA
IRF11n BW20 MCS716.5 dBm165193mA
  1. RX power consumption:
SymbolModeAverage ValuePeak Value (Typical Value)Unit
IRF11B 11M6365mA
IRF11G 54M6567mA
IRF11N HT20 MCS76567mA

Working Power Consumption

Working ModeWorking Status (Ta = 25°C)Average ValuePeak Value (Typical Value)Unit
Quick connection network statusThe module is in the fast network connection state and the WiFi indicator always flashes75324mA
Network connection idle stateThe module is connected to the network and the WiFi indicator is always on64314mA
Network connection operation statusThe module is connected to the network and the WiFi indicator is always on66305mA
Disconnected statusThe module is offline and the WiFi indicator is dark66309mA

RF Parameters

### Basic RF Features

Frequency range2.400 to 2.4835 GHz
WiFi standardIEEE 802.11b/g/n (channels 1 to 14)
BLE standardBluetooth 4.2
Data transmission rate11b: 1, 2, 5.5, 11 (Mbps)
Data transmission rate11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps)
Data transmission rate11n: HT20 MCS0~7
Antenna TypePCB antenna with a gain of 2.5 dBi

TX Performance

ParameterMinimum ValueTypical ValueMaximum ValueUnit
Average RF output power, 802.11b CCK Mode, 1 Mbit/s-17.5-dBm
Average RF output power, 802.11g OFDM mode, 54 Mbit/s-14.5-dBm
Average RF output power, 802.11n OFDM mode, MCS7-13.5-dBm
Average RF output power, BLE 4.2, 1 Mbit/s-6.5-dBm
Frequency error-20-20ppm
EVM@802.11b CCK 11Mbps Mode 17.5 dBm---10dB
EVM@802.11g OFDM 54Mbps Mode 14.5 dBm---29dB
EVM@802.11n OFDM MCS7 Mode 13.5 dBm---30dB

RX Performance

ParameterMinimum ValueTypical ValueMaximum ValueUnit
PER<8%, RX sensitivity, 802.11b CCK Mode 1M--91-dBm
PER<10%, RX sensitivity, 802.11g OFDM Mode 54M--75-dBm
PER<10%, RX sensitivity, 802.11n OFDM Mode MCS7--72-dBm
PER<10%, RX sensitivity, BLE 4.2 1M--93-dBm

Antenna Information

Antenna Type

WBR2 uses only an onboard PCB antenna with a gain of 2.5dBi.

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.

Power-on Sequence and Resetting

Power-on Sequence

The RTL8720CF chip has requirements on the power-on sequence. It is recommended that the voltage rise from 0 to 3.3V within 40mS. WBR2 Module Datasheet

TPRDY3.3V ready time0.6 20mS
CHIP_ENCHIP_EN ready time0.6 20mS


When designing a plate of a module, you should set a resetting IC at the foot of CHIP_EN in advance. The preferable type of IC is BL8506-27CRO. The module is packaged in the form of SOT23. Refer to the circuit in the following figure (R30 is preset and cannot be placed).

WBR2 Module Datasheet

Packaging Information and Production Instructions

Mechanical Dimensions

The mechanical dimensions of PCB of WBR2 are 15±0.35 mm (W)×18±0.35 mm (L) ×0.8±0.1 mm (H). The following figure shows mechanical dimensions of WBR2. WBR2 Module Datasheet Note: The default dimensional tolerance is ±0.35 mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication.

Recommended PCB Layout

The following figure is a schematic diagram of WBR2 which shows how pins correspond to each other.

WBR2 Module Datasheet

WBR2 PCB Layout is shown as belows:

WBR2 Module Datasheet

Production Instructions

  1. For the in-line module developed by Tuya, wave soldering equipment is most preferred and manual soldering is less preferred. After unpacking, the module must be soldered within 24 hours; otherwise, vacuum packaging need to be carried out again. A. Soldering equipment and materials:
    • Wave soldering equipment
    • Wave soldering fixture
    • Constant-temperature soldering iron
    • Tin bar, tin wire and flux
    • Oven temperature tester B. Baking equipment:
    • Cabinet oven
    • Anti-static heat-resistant trays
    • Anti-static heat-resistant gloves
  2. The module developed by Tuya needs to be baked in the following cases:
  3. Vacuum packaging bag was damaged before unpacking.
  4. There is no a humidity indicator card (HIC) in the vacuum packaging bag.
  5. After unpacking, 30% and above circles on the HIC become pink.
  6. Production is not completed within 72 hours after unpacking.
  7. More than 6 months after the date of sealing the bag.
  8. Baking setting:
  9. Baking temperature: reel packing 65±5℃, pallet packing 125±5℃
  10. Baking time: reel packing 48 hours, pallet packing 12 hours
  11. Alarm Temperature : reel packing 70℃, pallet packing 130℃
  12. Production ready temperature after natural cooling: < 36°C
  13. The number of baking times: 1
  14. Rebaking condition: The module is not soldered within 72 hours after baking.
  15. Do not use wave soldering to process modules that have been unpacked for more than 3 months. Electroless nickel immersion gold (ENIG) is used for the PCBs. Wave soldering is very likely to cause false soldering and missing soldering. Tuya is not liable for such problems and consequences.
  16. In the production process, take electrostatic discharge (ESD) protective measures.
  17. To ensure the quality of products, you should pay attention to the amount of soldering flux, the height of the wave peak, whether the tin slag and copper content in the wave soldering tank exceed standards, whether the window and thickness of the wave soldering fixture are appropriate, and whether the wave soldering oven temperature curve is reasonable.

Recommended Oven Temperature Curve and Temperature

For oven temperature setting, refer to suggestions on oven temperatures for wave solering. The peak temperature is 260±5℃. The wave soldering temperature curve is as belows: WBR2 Module Datasheet

Suggestions on oven temperatures for wave solering WBR2 Module Datasheet

Storage Conditions

Storage conditions for a delivered module are as follows: A. The moisture-proof bag is placed in an environment where the temperature is below 30°C and the relative humidity is lower than 70%. B. The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed. C. The package contains a humidity indicator card (HIC). WBR2 Module Datasheet WBR2 Module Datasheet

MOQ and Packaging Information

Product NumberMOQ(pcs)Shipping packaging methodThe number of modules per reel (pcs)The number of reels per carton (reel)
WBR24400Tape reel11004


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 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.

Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled rolled 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 intended 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 Subpart 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-WBR2. The final end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WBR2” . This device is intended only for OEM integrators under the following conditions: 1) The antenna must be installed such that 20cm is maintained between the antenna 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 WBR2 Module Datasheet

Hereby, Hangzhou Tuya Information Technology Co., Ltd declares that this module product is in compliance with essential requirements and other relevant provisions of Directive 2014/53/EU, 2011/65/EU. A copy of the Declaration of conformity can be found at https://www.tuya.com. WBR2 Module Datasheet 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.

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