WBR3S Reset & Teardown (FCC ID 2ANDL-WBR3S)

WBR3S User manual 

1 Product Overview 

WBR3S 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. WBR3S has an embedded low-power 32-bit CPU, 512 KB static randomaccess memory 
(SRAM), 4 MB flash memory, and rich peripherals. WBR3S 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 1.7 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 1.7 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 

WBR3S 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 WBR3S 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 mach...