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CW03 Module Datasheet

Last Updated on : 2021-09-11 06:56:53download

Product overview

Developed by Tuya, CW03 is a low-power Wi-Fi module that is suitable for serial communication of the level from 12V to 5 V TTL. Built in with the Wi-Fi network protocol stack and rich library functions, it consists of a highly integrated wireless RF chip (RTL8710BN) and an external flash chip. With the maximum CPU clock rate of 125 MHz, CW03 also includes a low-power ARM CM4F, a WLAN MAC, a 1T1R WLAN, a 256-KB SRAM, 2-MB flash memory, and rich peripherals.
CW03 is an RTOS platform that integrates all function libraries of the Wi-Fi MAC and TCP/IP. Based on the serial communication manner, you can develop embedded Wi-Fi products as required.


  • Embedded with the low-power 32-bit CPU, which can also function as an application processor
    • The maximum clock rate: 125 MHz
  • Operating voltage: 12V
  • Peripheral: 1 UART
  • Wi-Fi connectivity
    • 802.11 b/g/n20/n40
    • Channels 1 to 14@2.4 GHz
    • Support WPA/WPA2 security mode
    • Up to +18dBm output power in 802.11b mode
    • Support SmartConfig for Android and iOS devices
    • Onboard PCB antenna
    • Operating temperature: -20℃ to 85℃


  • Intelligent building
  • Smart household and home appliances
  • Smart socket and light
  • Industrial wireless control

Change history

Update date Updated content Version after update
July 8, 2020 This is the first release. V1.0.0

Module interfaces

Dimensions and footprint

As shown in the following figure, the dimensions of CW03 are 20.0±0.35 mm (W)×36.0±0.35 mm (L) ×3.0±0.15 mm (H). The thickness of the PCB is 1.0±0.1 mm.
CW03 Module Datasheet

Pin definition

Pin number Symbol Type Function
1 12V P Power supply pin (12V)
2 GND P Power supply reference ground
4 RXD I/O Receiving interface (user-side serial interface)
5 TXD I/O Transmitting interface (user-side serial interface)

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

Definition on test pins

Pin number Symbol Type Function
6 3.3V P The 3.3V pin is used to burn the firmware
7 GND P Power supply reference ground
8 A_29 I/O GPIOA_29 (Used for burning and authorization)
9 A_30 I/O GPIOA_30 (Used for burning and authorization)
10 RX I/O UART0_RX (Used for burning and authorization)
11 TX I/O UART0_TX (Used for burning and authorization)
12 RST I/O Hardware reset pin

Note: Test pins are forbidden.

Electrical parameters

Absolute electrical parameters

Parameter Description Minimum value Maximum value Unit
Ts Storage temperature -40 125
VBAT Supply voltage -0.3 18 V
ESD voltage (human body model) TAMB-25℃ - 2 KV
ESD 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 Supply voltage 10.8 12 13.2 V
VIL Voltage input low -0.3 - 5*0.25 V
VIH Voltage input high 5*0.75 - 5 V
VOL Voltage output low - - 5*0.1 V
VOH Voltage output high 5*0.8 - 5 V
Imax 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 +17dBm 280 - mA
Transmit 11g 54Mbps +15dBm 255 - mA
Transmit 11n BW20 MCS7 +13dBm 244 - mA
Transmit 11n BW40 MCS7 +13dBm 220 - mA

RX power consumption

Working status Mode Receive Average value Peak value (typical value) Unit
Receive CPU Sleep Constantly receive 90 - mA
Receive CPU Active Constantly receive 120 mA

Power consumption in working mode

Working mode Working status, Ta = 25°C Average value Peak value (typical value) Unit
AP The module is in AP mode 48 132 mA
Idle state of network connection The module is in idle state of network connection 37 127 mA
Operation state of network connection The module is connecting to the network 42 130 mA

Note: The peak lasts about 10ms. The above parameters may vary with different firmware functions.

RF parameters

Basic RF features

Parameter Description
Working frequency 2.400 to 2.484 GHz
Wi-Fi standard IEEE 802.11 b/g/n (channels 1 to 14)
Data transmission rate 11b: 1, 2, 5.5, and 11 (Mbps); 11g: 6, 9, 12, 18, 24, 36, 48, and 54 (Mbps); 11n: HT20 MCS 0 to 7; 11n: HT40 MCS 0 to 7
Antenna type PCB antenna

TX performance

TX performance

Parameter Minimum value Typical value Maximum value Unit
Average output power, 802.11b CCK Mode 11M - 17.5 - dBm
Average output power, 802.11g OFDM Mode 54M - 14.5 - dBm
Average 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 information

Antenna type

CW03 supports two types of antennas: Onboard PCB antenna and external antenna. By default, the onboard PCB antenna is preferred.

Antenna interference reduction

To ensure optimal Wi-Fi performance when the Wi-Fi module uses an onboard PCB antenna, it is recommended that the antenna be at least 15mm away from other metal parts.
To prevent adverse impact on the antenna radiation performance, avoid copper or traces within the antenna area of the PCB.
CW03 Module Datasheet
CW03 Module Datasheet

Specifications of antenna connector

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

Packaging information and production instructions

Mechanical dimensions

CW03 Module Datasheet

Specifications of connector

The PCB uses the pin header (4*2.54) as the connector. Its specifications are shown below:
CW03 Module Datasheet

Production instructions

Storage conditions for a delivered module are as follows:

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


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

Recommended oven temperature curve

We mount the PCB with the SMT according to the following temperature curve. The peak temperature is 245°C.

CW03 Module Datasheet

Storage conditions

CW03 Module Datasheet

MOQ and packaging information

Product model MOQ (pcs) Shipping packaging method Modules per carton (pcs) Reels per carton (reel)
CW03 400 Bubble bags 200 2