Last Updated on : 2021-09-11 06:46:44download
WR4 is a low power-consumption built-in Wi-Fi module developed by Tuya. It consists of a highly integrated RF chip (RTL8710BN) and an external flash chip, with a built-in Wi-Fi network protocol stack and rich library functions.
WR4 also contains a low power-consumption ARM CM4F, a WLAN MAC, a 1T1R WLAN, a basic frequency of up to 125 MHz, 256-KB SRAM, 1-MB flash memory, and rich 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
Basic frequency: 125 MHz
Operating voltage:3 V to 3.6 V
Peripherals: 9 GPIOs, 1 UART, and 1 ADC
Channel 1–email@example.com GHz
WEP, WPA, WPA2, and WPA2 PSK (AES) security modes 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
Operating temperature: –40°C to +85°C
AES 128/256-based hardware encryption
WR4 has two lines of pins (2 x 8) with a distance of 1.5 mm between every two pins.
WR4 dimensions: 13.8±0.35 mm (W)×15.5±0.35 mm (L) ×3.4±0.15 mm (H)
|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.
|Parameters||Description||Minimum value||Maximum value||Unit|
|VDD||Power supply voltage||-0.3||3.6||V|
|ESD voltage (human body model)||TAMB-25℃||-||2||KV|
|ESD voltage (machine model)||TAMB-25℃||-||0.5||KV|
|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|
|Working status||Mode||Rate||Transmit power/Receive||Average value||Peak value (Typical value)||Unit|
|Woking mode||Working status, Ta=25℃||Average value||Peak value (Typical 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 value lasts for about 5 µs.
The preceding parameters vary with firmware functions.
|Frequency range||2.400 to 2.4835 GHz|
|Wi-Fi standard||IEEE 802.11b/g/n (channels 1 to 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|
|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|
|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. The following figure 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.
The stamp-hole module must be mounted by the SMT machine. After being unpacked, it must be soldered within 24 hours. Otherwise, it must be put into the drying cupboard where the RH is not greater than 10%, or it needs to be packaged under vacuum again and the exposure time needs to be recorded (the total exposure time cannot exceed 168 hours).
Storage conditions for a delivered module are as follows:
The module needs to be baked in the following cases:
Important: If this batch of modules is not baked within 168 hours, do not use the wave soldering to solder them. Because these modules are 3-level moisture-sensitive components, they are very likely to get damp when exposed outside. In this case, if they are soldered at high temperatures, it may result in component failure or poor soldering.
In the whole production process, take electrostatic discharge (ESD) protective measures.
To guarantee the passing rate, it is recommended that you use the SPI and AOI to monitor the quality of solder paste printing and mounting.
Perform mounting with the SMT based on the following reﬂow oven temperature curve. The highest temperature is 245°C. The reflow temperature curve is as below:
A: Temperature axis
B: Time axis
C: Liquidus temperature: 217 to 220°C
D: Ramp-up slope: 1 to 3°C/s
E: Duration of constant temperature: 60 to 120s; the range of constant temperature: 150 to 200°C
F: Duration above the liquidus: 50 to 70s
G: Peak temperature: 235 to 245°C
H: Ramp-down slope: 1 to 4°C/s
Note: The above curve is just an example of the solder paste SAC305. For more details about other solder pastes, please refer to Recommended oven temperature curve in the solder paste specifications.
|Product model||MOQ（pcs）||Packing method||Modules per reel||Reels per carton|
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:
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.
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-WR4. The 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:
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.
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