MDWBRCU1 Adapter Board Datasheet

Overview

MDWBRCU1 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. It combines a low-power KM4 microcontroller unit (MCU), WLAN MAC, and 1T1R (1 transmitter/1 receiver) design. It 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 various applications.
MDWBRCU1 is a real-time operating system (RTOS), integrated with all Wi-Fi MAC and TCP/IP libraries. You can 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 802.11 b/g/n20.
  • Channels 1-14@2.4GHz (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: -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

MDWBRCU1 interfaces

Dimensions and footprint

MDWBRCU1 uses USB serial communication. The following figure shows the positions of serial ports:

Note: P indicates the power pin, and I/O indicates the input and output pin.

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)	Unit
  IRF	802.11b, 11 Mbit/s	+17 dBm	177	214	mA
  IRF	802.11g, 54 Mbit/s	+15 dBm	154	186	mA
  IRF	802.11n, BW20 MCS7	+14 dBm	154	186	mA

• Power consumption during RX continuous reception

  Symbol	Mode	Average value	Peak (Typical)	Unit
  IRF	802.11b, 11 Mbit/s	40.6	59.6	mA
  IRF	802.11g, 54 Mbit/s	40.6	58.8	mA
  IRF	802.11n, HT20 MCS7	40.5	58.8	mA

Power consumption in working mode

RF parameters

Basic RF features

Transmitter (TX) performance

• TX continuous transmission performance

  Parameter	Min value	Typical value	Max value	Unit
  RF average output power, 802.11b CCK mode, 11M	-	17	-	dBm
  RF average output power, 802.11g OFDM mode, 54M	-	14	-	dBm
  RF average output power, 802.11n OFDM mode, MCS7	-	13	-	dBm
  RF average output power, Bluetooth LE 4.2,1M	-	6.5	-	dBm
  Frequency error	-20	-	20	ppm
  EVM@802.11b CCK 11 Mbit/s mode, 17 dBm	-	-	-15	dB
  EVM@802.11g OFDM 54 Mbit/s mode, 14 dBm	-	-	-33	dB
  EVM@802.11n OFDM MCS7 mode, 13 dBm	-	-	-33	dB

• Receiver (RX) performance

  Parameter	Min value	Typical value	Max value	Unit
  PER < 8%, RX sensitivity, 802.11b CCK mode, 11M	-	-87	-	dBm
  PER < 10%, RX sensitivity, 802.11g OFDM mode, 54M	-	-75	-	dBm
  PER < 10%, RX sensitivity, 802.11g OFDM mode, MCS7	-	-72	-	dBm
  PER < 10%, RX sensitivity, Bluetooth LE 4.2, 1M	-	-93	-	dBm

Appendix: Statement

FCC Caution: 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.
This device has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with 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 equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment 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 equipment and receiver.
• Connect the equipment to 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.

Caution: Changes or modifications not expressly approved by the party responsible for compliance could void the user‘s authority to operate the equipment.

This equipment should be installed and operated with a minimum distance of 20 cm from your body.

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 from the human body.