Last Updated on : 2022-08-08 10:16:24download
WR2 is a low-power embedded Wi-Fi module that Tuya has developed. It consists of a highly integrated wireless RF chip (RTL8710BN) and an external flash chip, with an embedded Wi-Fi network protocol stack and varied library functions.
With the maximum CPU clock rate of 125 MHz, WR2 also contains a low-power ARM CM4F, a WLAN MAC, a 1T1R WLAN module, 256-KB static random-access memory (SRAM), 2-MB ﬂash memory, and extensive peripherals.
WR2 is an RTOS platform that integrates all function libraries of the Wi-Fi MAC and TCP/IP protocols. You can develop embedded Wi-Fi products as required. The structural diagram of WR2 is shown in the following figure:
WR2 has two lines of pins with a 2.0mm pin spacing. Each row has 9 pins.
The dimensions of WR2 are 15±0.35 mm (W)×18 ±0.35 mm (L) ×4.9±0.15 mm (H). (In the bottom view, the height of the device is 1.5 mm). The diagram of dimensions of WR2:
Definitions of common pins are shown in the following table:
|Pin number||Symbol||I/O type||Function|
|1||VD33||P||Power supply pin (3.3V)|
|2||GPIOA_12||I/O||GPIOA_12, a universal GPIO, hardware PWM, IC Pin 17|
|3||GND||P||Power supply reference ground|
|4||GPIOA_0||I/O||GPIOA_0, which cannot be pulled high when powered on, and which can be configured with any level after being enabled, hardware PWM, IC Pin 16|
|5||GPIOA_18||I/O||UART0_RXD (user-side serial interface)|
|6||GPIOA_5||I/O||GPIOA_5, a universal GPIO, hardware PWM, IC Pin 28|
|7||GPIOA_23||I/O||UART0_TXD (user-side serial interface)|
|8||ADC||AI||ADC port, the maximum input voltage is 5V|
|9||GPIOA_14||I/O||GPIOA_14, a universal GPIO, hardware PWM, IC Pin 13|
|10||CHIP_EN||I/O||When software disables the function, connection by a user fails|
|11||GPIOA_15||I/O||GPIOA_15, a universal GPIO, hardware PWM, IC Pin 14|
Pindicates power supply pins, I/O indicates input/output pins, and AI indicates analog input pins.
|Parameter||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|
Normal working conditions:
|Parameter||Description||Minimum value||Typical Value||Maximum Value||Unit|
|VIL||IO low level input||-0.3||-||VDD*0.25||V|
|VIH||IO high level input||VDD*0.75||-||3.6||V|
|VOL||IO low level output||-||-||VDD*0.1||V|
|VOH||IO high level output||VDD*0.8||-||VDD||V|
|Imax||IO drive current||-||-||16||mA|
|Cpad||Input pin capacitance||-||2||-||pF|
TX power consumption:
|Working status||Mode||Rate||Transmit power/Receive||Average value||Peak value (Typical value)||Unit|
|Transmit||11 b||11 Mbps||+17 dBm||287||367||mA|
|Transmit||11 b||11 Mbps||+18 dBm||295||382||mA|
|Transmit||11 g||54 Mbps||+15 dBm||255||406||mA|
|Transmit||11 g||54 Mbps||+17.5 dBm||267||428||mA|
|Transmit||11n-HT20||MCS 7||13 dBm||244||395||mA|
|Transmit||11n-HT20||MCS 7||16.5 dBm||257||422||mA|
|Transmit||11n-HT40||MCS 7||13 dBm||220||393||mA|
|Transmit||11n-HT40||MCS 7||16.5 dBm||230||420||mA|
RX power consumption:
Operating current of the module:
|Working mode||Working status, Ta = 25°C||Average value||Peak value (Typical value)||Unit|
|Quick connection network state||The module is in the fast network connection state and the Wi-Fi indicator always flashes||115||376||mA|
|Hotspot network configuration state||The module is in the hotspot network configuration state and the Wi-Fi indicator always flashes slowly||60||386||mA|
|Network connection operation state||The module is connected to the network and the Wi-Fi indicator is always on||105||389||mA|
|Disconnected state||The module is disconnected and the Wi-Fi indicator is dark||45||381||mA|
Note: The peak value lasts about 5μs.
The above parameters may vary with different firmware functions.
Basic RF features:
|Frequency range||2.400 to 2.4835 GHz|
|Wi-Fi standard||IEEE 802.11 b/g/n (channels 1 to 14)|
|Data transmission rate||11b: 1, 2, 5.5, 11 (Mbps)
11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps)
11n: HT20 MCS 0 to 7
|Antenna type||Onboard PCB antenna|
|Parameter||Minimum value||Typical value||Maximum value||Unit|
|Average RF output power, 802.11b CCK Mode||11M||-||17.5||-|
|Average RF output power, 802.11g OFDM Mode 54M||-||14.5||-||dBm|
|Average RF output power, 802.11n OFDM Mode||MCS7||-||13.5||-|
|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|
WB8P uses only an onboard PCB antenna.
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 15 mm away from other metal parts.
The mechanical dimensions of the PCB of WR2 are 15±0.35 mm (W)×18±0.35 mm (L) ×0.8±0.1 mm (H).
The diagram of mechanical dimensions of WR2:
The schematic diagram of WR2 shows how pins correspond to each other:
For the Tuya in-line module, wave soldering is most preferred and manual soldering is less preferred. After being unpacked, the module 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 record the exposure time (the total exposure time cannot exceed 168 hours).
Wave soldering devices and materials:
The module needs to be baked in the following cases:
In the whole production process, take electrostatic discharge (ESD) protective measures.
To guarantee the quality of products, you must pay attention to the following items: The amount of soldering flux, the height of the wave peak, whether the tin slag and copper content in the wave soldering tank exceed standards, whether the window and thickness of the wave soldering fixture are appropriate, and whether the wave soldering oven temperature curve is appropriate.
Set oven temperatures according to the following temperature curve of wave soldering. The peak temperature is 260°C±5°C.
Recommended soldering temperature:
|Suggestions on oven temperature curve of wave soldering||Suggestions on manual soldering temperature|
|Preheat temperature||80 to 130 °C||Soldering temperature||360±20°C|
|Preheat time||75 to 100s||Soldering time||＜3s/point|
|Peak contact time||3 to 5s||NA||NA|
|Temperature of tin cylinder||260±5°C||NA||NA|
Storage conditions for a delivered module:
The moisture-proof bag is placed in an environment where the temperature is below 40°C and the relative humidity is lower than 90%.
The shelf life of a dry-packaged product is 12 months from the date when the product is packaged and sealed.
There is a humidity indicator card (HIC) in the packaging bag.
|Product model||MOQ (pcs)||Shipping packaging method||The number of modules per reel||The number of 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 operate 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-WR2. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR2”.
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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