TCWBR-US3 Adapter Board Datasheet

Overview

TCWBR-US3 is a Wi-Fi and Bluetooth Low Energy (LE) combo adapter board developed by Tuya Smart. It consists of a highly integrated wireless RF chip RTL8720CF with built-in Wi-Fi stacks and various library functions. TCWBR-US3 combines a low-power KM4 microcontroller unit (MCU), WLAN MAC, and 1T1R (1 transmitter/1 receiver) design. This module provides output frequency up to 100 MHz, 256 KB embedded SRAM, 2 MB flash memory, and configurable GPIOs that can function as digital peripherals for diverse applications.
TCWBR-US3 is a real-time operating system (RTOS), integrated with all Wi-Fi MAC and TCP/IP libraries. All these resources can help you develop your own embedded Wi-Fi products.

Features

• Built-in low-power KM4 MCU that provides output frequency up to 100 MHz and also acts as an application processor.
• Wi-Fi and Bluetooth connectivity:
  • IEEE 802.11b/g/n20.
  • Channels 1–14@2.4 GHz (CH1–11 for US/CA and CH1–13 for EU/CN).
  • Support security protocols, including WEP, WPA, WPA2, and WPA2 PSK (AES).
  • Support Bluetooth LE 4.2.
  • The maximum output power is +20 dBm for IEEE 802.11b transmission.
  • Support Wi-Fi Easy Connect (EZ mode) pairing mode on Android and iOS devices.
  • Onboard PCB antenna.
  • It has passed CE and FCC certifications.
  • Operating temperature range: -20°C to +85°C.

Applications

• Smart building
• Smart home and electrical appliance
• Smart socket and light
• Industrial wireless control
• Baby monitor
• IP camera
• Smart bus

TCWBR-US3 interfaces

Dimensions and footprint

TCWBR-US3 uses USB serial communication. The following figure shows the positions of serial ports:

The following figure shows the dimensions of the finished product shell:

Electrical parameters

Electrical parameters

Radio frequency (RF) power

• Power consumption during TX continuous transmission

  Symbol	Mode	Power	Average value	Peak (Typical) value	Unit
  IRF	802.11b, 11 Mbit/s	17 dBm	217	268	mA
  IRF	802.11b, 11 Mbit/s	18 dBm	231	283	mA
  IRF	802.11g, 54 Mbit/s	15 dBm	159	188	mA
  IRF	802.11g, 54 Mbit/s	17.5 dBm	177	213	mA
  IRF	802.11n, BW20 MCS7	13 dBm	145	167	mA
  IRF	802.11n, BW20 MCS7	16.5 dBm	165	193	mA

• Power consumption during RX continuous reception

  Symbol	Mode	Average value	Peak (Typical) value	Unit
  IRF	802.11b, 11 Mbit/s	63	65	mA
  IRF	802.11g, 54 Mbit/s	65	67	mA
  IRF	802.11n, HT20 MCS7	65	67	mA

Power consumption in working mode

RF parameters

Basic RF features

Transmitter (TX) performance

• Continuous transmission performance

  Parameter	Min value	Typical value	Max value	Unit
  RF average output power, 802.11b CCK mode, 1 Mbit/s	-	17.5	-	dBm
  RF average output power, 802.11g OFDM mode, 54 Mbit/s	-	14.5	-	dBm
  RF average output power, 802.11n OFDM mode, MCS7	-	13.5	-	dBm
  RF average output power, Bluetooth LE 4.2, 1 Mbit/s	-	6.5	-	dBm
  Frequency error	-20	-	20	ppm
  EVM@802.11b CCK 11 Mbit/s mode, 17.5 dBm	-	-	-10	dB
  EVM@802.11g OFDM 54 Mbit/s mode, 14.5 dBm	-	-	-29	dB
  EVM@802.11n OFDM MCS7 mode, 13.5 dBm	-	-	-30	dB

• Receiver (RX) performance

  Parameter	Min value	Typical value	Max value	Unit
  PER < 8%, RX sensitivity, 802.11b CCK mode, 1 Mbit/s	-	91	-	dBm
  PER < 10%, RX sensitivity, 802.11g OFDM mode, 54 Mbit/s	-	-75	-	dBm
  PER < 10%, RX sensitivity, 802.11n OFDM mode, MCS7	-	-72	-	dBm
  PER < 10%, RX sensitivity, Bluetooth LE 4.2, 1 Mbit/s	-	-93	-	dBm

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-TCWBR-US3. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-TCWBR-US3”.

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

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.

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.