JWBR2S-3.3V Module Datasheet

Last Updated on : 2021-08-27 03:58:48download

Developed by Tuya, JWBR2S-3.3V is a Wi-Fi module that is suitable for serial communication of the 3.3 V TTL level. It consists of dual modules: WiFi module+Bluetooth WBR1 module, and a level conversion circuit. It’s further embedded with the Wi-Fi/BT network protocol stack and serial communication protocol.

Product overview

JWBR2S-3.3V is an RTOS platform. On the basis of the connection manner of serial communication, you can develop embedded products as required.


  • Embedded low-power KM4-MCU, which can also function as an application processor
  • The maximum clock rate: 100 MHz
  • Working voltage: 3.3 V
  • Peripherals: 1 universal asynchronous receiver/transmitter (UART)
  • Wi-Fi connectivity
    • 802.11 b/g/n20
    • Channels 1 to 14 at 2.4 GHz
    • Support Bluetooth LE (Bluetooth Low Energy) 4.2
    • Support WPA and WPA 2 security modes
    • Up to +18 dBm output power in 802.11b mode
    • Support SmartConfig functions for Android and iOS devices
    • Onboard PCB antenna
    • 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

Update Date Updated Content Version after Update
2/26/2020 This is the first release. V2.0.0

Module interfaces

Dimensions and footprint

The electrical interface of JWBR2S-3.3V is the PH-4AW connector with a spacing of 2.0 mm.
As shown in the following figure, the dimensions of JWBR2S-3.3V are 42.6±0.35 mm (L)×31±0.35 mm (W) ×9.1±0.15 mm (H). The thickness of the PCB is 1.2±0.1 mm.

JWBR2S-3.3V Module Datasheet

Pin definition

Pin Number Symbol I/O Type Function
1 RX I/O UART0_RXD, receiver for communication of the module, input the level of 3.3V TTL
2 TX I/O UART0_TXD, the transmitter for communication of the module, output the level of 3.3V TTL
3 GND P Power supply reference ground
4 VCC P Power supply pin (3.3V)

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

Definitions on test points

Pin Number Symbol I/O Type Function
1 3.3V P Power supply pin inside the module (3.3V)
2 GND P Power supply reference ground
3 Log_Tx I/O UART_Log_TXD (used to display the internal information of the module)
4 Log_Rx I/O UART_Log_RXD (used to display the internal information of the module)
5 RXD I/O Programming interface for the firmware of the module
6 TXD I/O Programming interface for the firmware of the module
7 A_0 I/O GPIOA_0, a programming interface for the firmware of the module During the download, the pin needs to be pulled to 3.3V.
8 RST I/O Hardware reset pin

Note: P indicates power supply pins, I/O indicates input/output pins, and test points are prohibited.

Electrical parameters

Absolute electrical parameters

Parameter Description Minimum value Maximum Value Unit
Ts Storage temperature -40 105
VBAT Power supply voltage -0.3 3.3 V
Static electricity discharge voltage (human body model) TAMB-25℃ - 2 KV
Static electricity discharge voltage (machine model) TAMB-25℃ - 0.5 KV

Normal working conditions

Parameter Description Minimum value Typical Value Maximum Value Unit
Ta Working temperature -20 - 85
VBAT Power supply voltage 3.0 3.3 3.6 V
VIL IO low-level input -0.3 - VCC*0.25 V
VIH IO high-level input VCC*0.75 - VCC V
VOL IO low-level output - - VCC*0.1 V
VOH IO high-level output VCC*0.8 - VCC V
Imax IO drive current - - 16 mA
Cpad Input pin capacitance - 2 - pF

TX power consumption

Working Status Mode Rate Transmit Power Average Value Peak Value (Typical Value)) Unit
Transmit 11b 11Mbps +17 dBm 217 268 mA
Transmit 11b 11Mbps +18 dBm 225 280 mA
Transmit 11 g 54Mbps +15 dBm 159 188 mA
Transmit 11 g 54Mbps +17.5 dBm 177 213 mA
Transmit 11n BW20 MCS7 +13 dBm 145 167 mA
Transmit 11n BW20 MCS7 +16.5 dBm 165 193 mA

RX power consumption

Working Status Mode Receive Average Value Peak Value (Typical Value)) Unit
Receive CPU Sleep 11Mbps 63 75 mA
Receive CPU Active 54Mbps 65 78 mA
Receive CPU Active MCS7 65 78 mA

Power consumption in working mode

Working Mode Working Status, Ta = 25°C Average Value Peak Value (Typical Value) Unit
Quick connection network state The module is in the fast network connection state 74 324 mA
Network connection idle state The module is in the network connection idle state 62 320 mA
Network connection operation state The module is connected to the network 65 315 mA
Disconnected state The module is disconnected 66 322 mA

Note: The peak lasts about 5us. The above parameters may vary with different firmware functions.

RF parameters

Basic RF features

Parameter Description
Working frequency 2.400 to 2.484GHz
WiFi standard IEEE 802.11 b/g/n (channels 1 to 14)
Data transmission rate 11b: 1, 2, 5.5, 11 (Mbps); 11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps); 11n: HT20 MCS 0 to 7
Antenna type IPEX Antenna

TX performance

TX performance

Parameter Minimum Value Typical Value Maximum Value Unit
Average RF output power, 802.11b CCK Mode 11M - 17.5 - dBm
Average RF output power, 802.11g OFDM Mode 54M - 14.5 - dBm
Average RF output power, 802.11n OFDM Mode MCS7 - 13.5 - dBm
Frequency error -20 - 20 ppm

RX performance

RX sensitivity

Parameter Minimum Value Typical Value Maximum Value Unit
PER<8%, RX sensitivity, 802.11b DSSS 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


Antenna type

JWBR2S-3.3V uses two types of antennas: onboard PCB antenna and external antenna. By defalut, the onboard PCB antenna is preferred.

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.

JWBR2S-3.3V Module Datasheet
JWBR2S-3.3V Module Datasheet

Antenna connector specifications

There is no antenna connector for this module at the moment.

Packaging information and production instructions

Mechanical dimensions

JWBR2S-3.3V Module Datasheet
Specifications of a Terminal
The specifications of the terminal are 2.0 mm*4 Pin. Detailed parameters are as follows:
JWBR2S-3.3V Module Datasheet

Parameters of the shell

JWBR2S-3.3V Module Datasheet

Production instructions

Storage conditions for a delivered module are as follows:

  1. The moisture-proof bag must be placed in an environment where the temperature is below 30°C and the relative humidity is lower than 85%.
  2. The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed.


  1. In the production process, all operators must wear electrostatic rings.
  2. During operation, strictly prevent the module from getting wet or dirty.

Recommended oven temperature curve

Perform SMT based on the following reflow oven temperature curve. The highest temperature is 245°C. The reflow temperature curve is shown as belows:

JWBR2S-3.3V Module Datasheet

Storage conditions

JWBR2S-3.3V Module Datasheet

MOQ and packaging information

Product Number MOQ (pcs) Shipping packaging method The number of modules per carton (pcs) The number of reels per carton (reel)
JWBR2S-3.3V Packaging through bubble bags 200 2

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 device.

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 device has been tested and found to comply with the limits for a Class B digital device, according to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This device generates, uses, and can radiate radio frequency energy and, if not installed and used following 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 device does cause harmful interference to radio or television reception, which can be determined by turning the device 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 device and receiver.
  • Connect the device 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 device complies with FCC radiation exposure limits set forth for an uncontrolled rolled environment. This device should be installed and operated with a minimum distance of 20cm between the radiator and your body.

Important Note

This radio module must not be installed to co-locate and operating simultaneously with other radios in the host system except following FCC multi-transmitter product procedures. Additional testing and device authorization may be required to operate simultaneously with other radios.

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 with 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/warnings 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 has got an FCC ID: 2ANDL-JWBR2S-3.3V. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-JWBR2S-3.3V”.

This device is intended only for OEM integrators under the following conditions:

The antenna must be installed such that 20cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna.

As long as the 2 conditions above are met, further transmitter tests 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

JWBR2S-3.3V 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.

JWBR2S-3.3V Module Datasheet

This product must not be disposed of as normal household waste, in accordance with the 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.