WR3L Reset & Teardown (FCC ID 2ANDL-WR3L)

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 [email protected]
 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
WR3LV1.0.0 User Manual
Version1.0.0
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. 
WR3LV1.0.0 User Manual
Version1.0.0
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 
(h...