Last Updated on : 2020-09-29 02:16:28download
WR4 is a low power-consuming built-in Wi-Fi module developed by Hangzhou Tuya Information Technology Co., Ltd. It consists of a highly integrated wireless radio chip (RTL8710BN) and an external flash chip, with a built-in Wi-Fi network protocol stack and robust library functions. WR4 also contains a low power-consuming ARM CM4F, a WLAN MAC, a 1T1R WLAN, a basic frequency of up to 125 MHz, a 256 KB SRAM, a 1 MB flash, and various peripheral resources.
WR4 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.
Built-in low power-consuming 32-bit CPU, which can also be used as an application processor
Working voltage:3 V to 3.6 V
Peripherals: nine GPIOs, one UART, and one ADC
Channel 1–firstname.lastname@example.org GHz
WEP,WPA/WPA2,PSK(AES) security mode supported
+20 dBm output power in 802.11b mode
SmartConfig function supported (for Android and iOS devices)
IPEX connector for external antennas
Certified by CE, FCC, and SRRC
Working temperature: –40°C to +85°C
AES 128/256-based hardware encryption
WR4 provides two rows of pins (2 x 8) with the distance of 1.5 mm between every two pins.
WR4 dimensions: 13.8 mm (W) x 15.5 mm (L) x 3.3 mm (H) (see figure 2.1)
Figure 2.1 WR4 dimensions
Table 2.1 describes the common pins.
Table 2.1 WR4 pins
|1||NC||/||NC, not connected|
|2||ADC||AI||ADC interface, with the maximum output power of 5 V|
|3||EN||I/O||The pin function is disabled by firmware, user can choose not to connect.|
|6||A_0||I/O||GPIOA_0, which cannot be pulled up during power-on and can be configured after power-on|
|8||3.3 V||P||Module power supply pin (3.3 V)|
|9||GND||P||Power supply reference ground pin|
|10||A_23||I/O||UART0_TXD (user’s serial port)|
|11||A_18||I/O||UART0_RXD (user’s serial port)|
|15||A_29||I/O||UART_Log_RXD (used for printing of the module internal information), which can also be used as the GPIO|
|16||A_30||I/O||UART_Log_TXD (used for printing of the module internal information), which can also be used as the GPIO|
Note: P indicates power-supply pins, I/O indicates input/output pins, and AI indicates analog input pins.
Table 3.1 Absolute electrical characteristics
|Parameters||Description||Minimum value||Maximum value||Unit|
|VDD||Power supply voltage||-0.3||3.6||V|
|Static electricity voltage (human model)||TAMB-25℃||-||2||KV|
|Static electricity voltage (machine model)||TAMB-25℃||-||0.5||KV|
Table 3.2 Normal electrical conditions
|Parameter||Description||Minimum Value||Typical Value||Maximum Value||Unit|
|VIL||I/O low-level input||–0.3||-||VDD*0.25||V|
|VIH||I/O high-level input||VDD*0.75||-||3.6||V|
|VOL||I/O low-level output||-||-||VDD*0.1||V|
|VOH||I/O high-level output||VDD*0.8||-||VDD||V|
|Imax||I/O drive current||-||-||16||mA|
|Cpad||Input pin capacitor||-||2||-||pF|
Table 3.3 TX power consumption during constant emission
|IRF||11b11 Mbit/s||17 dBm||287||mA|
|IRF||11b11 Mbit/s||18 dBm||295||mA|
|IRF||11g54 Mbit/s||15 dBm||255||mA|
|IRF||11g54 Mbit/s||17.5 dBm||267||mA|
|IRF||11n BW20MCS7||13 dBm||244||mA|
|IRF||11n BW20MCS7||16.5 dBm||257||mA|
|IRF||11n BW40MCS7||13 dBm||220||mA|
|IRF||11n BW40MCS7||16.5 dBm||230||mA|
Note: When the preceding data is used for testing, the amount of constantly emitted data (duty cycle) is 100%.
Table 3.4 RX power consumption during constant emission
Table 3.5 Module working current
|Working Mode||Working Status (Ta = 25°C)||Typical Value||Peak Value*||Unit|
|EZ mode||The module is in EZ status and the Wi-Fi indicator quickly flashes.||115||130||mA|
|Idle mode||The module is in connected status and the Wi-Fi indicator is steady on.||50||110||mA|
|Operation mode||The module is in connected status and the Wi-Fi indicator is steady on.||120||265||mA|
|Disconnection mode||The module is in disconnected status and the Wi-Fi indicator is steady off.||35||90||mA|
Note: The peak duration is about 5 µs.
The preceding parameter values vary depending on the firmware functions.
Table 4.1,Basic RF features
|Frequency range||2.400–2.4835 GHz|
|Wi-Fi standard||IEEE 802.11b/g/n (channel 1–14)|
|Data transmitting rate||11b: 1, 2, 5.5, 11 (Mbit/s)11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbit/s)11n: HT20 MCS0–MCS711n: HT40 MCS0–MCS7|
|Antenna type||External antenna connected through the U.FL RF connector|
Table 4.2 TX power during constant emission
|Parameter||Minimum Value||Typical Value||Maximum Value||Unit|
|RF average output power, 802.11b CCK mode||11M||-||17.5||-||dBm|
|RF average output power, 802.11g OFDM mode||54M||-||14.5||-||dBm|
|RF average output power, 802.11n OFDM mode||MCS7||-||13.5||-||dBm|
Table 4.3 RX Sensitivity
|Parameter||Minimum Value||Typical Value||Maximum Value||Unit|
|PER < 8%, RX sensitivity, 802.11b CCK mode||11M||-||–91||-||dBm|
|PER < 10%, RX sensitivity, 802.11g OFDM mode||54M||-||–75||-||dBm|
|PER < 10%, RX sensitivity, 802.11n OFDM mode||MCS7||-||–72||-||dBm|
The FPC antenna is recommended. Figure 5.1 shows the recommended antenna connection method and the dimensions. You can also select standard antennas based on the product assembly method.
To ensure optimal Wi-Fi performance when the Wi-Fi module uses the onboard PCB antenna, it is recommended that there be a space of at least 15 mm between the module antenna and other metal parts.
Figure 5.2 shows the U.FL RF connector parameters.
Storage conditions of a delivered module are as follows:
|Product number||MOQ（pcs）||Shipping packaging method||Modules per reel (pcs)||Packaging reels per box (reels)|
FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate this equipment.
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 equipment 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 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 equipment complies with FCC radiation exposure limits set forth for an uncontrolled rolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator and your body.
This radio module must not installed to co-locate and operating simultaneously with other radios in host system except in accordance with FCC multi-transmitter product procedures. Additional testing and equipment authorization may be required to operating simultaneously with other radio.
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 to 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/warning 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 have got a FCC ID：2ANDL-WR4.The final end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR4”
This device is intended only for OEM integrators under the following conditions:
1)The antenna must be installed such that 20cm is maintained between the antenna and users, and
2) The transmitter module may not be co-located with any other transmitter or antenna.
As long as 2 conditions above are met, further transmitter test 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 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.