Last Updated on : 2022-07-12 06:55:29download
WR3 is a low-power embedded Wi-Fi module that Tuya has developed. Embedded with the Wi-Fi network protocol stack and rich library functions, it also consists of a highly integrated RF chip (RTL8710BN) and an external flash chip.
With the maximum CPU clock rate of 125 MHz, WR3 contains a low-power ARM CM4F, a WLAN MAC, a 1T1R WLAN module, 256-KB SRAM, 2-MB ﬂash memory, and rich peripherals.
WR3 is an RTOS platform that integrates all function libraries of the Wi-Fi MAC and TCP/IP. You can develop embedded Wi-Fi products as required.
The following is the structural diagram of WR3:
|Date||Updated content||Version after update|
|03/09/2020||This is the first release.||1.0.0|
|04/13/2020||Update power consumption data||1.0.1|
WR3 has two lines of pins with a spacing of 2.0 mm. There are 8 pins in a line.
The WR3 dimensions are 16±0.35 mm (W)×24±0.35 mm (L) ×3.4±0.15 mm (H).
The diagram of dimensions of WR3:
|Pin number||Symbol||I/O type||Function|
|1||NC||/||Pulled up and not connected, to be compatible with other modules|
|2||GPIOA_22||I/O||GPIOA_22, hardware PWM, Pin 31 of the IC|
|3||CHIP_EN||I/O||When software disables the function, connection by a user fails|
|4||GPIOA_19||I/O||GPIOA_19, a universal I/O port, Pin 30 of the IC|
|5||GPIOA_14||I/O||GPIOA_14, hardware PWM, Pin 13 of the IC|
|6||GPIOA_15||I/O||GPIOA_15, hardware PWM, Pin 14 of the IC|
|7||GPIOA_0||I/O||GPIOA_0, which cannot be pulled high when powered on, and which is configurable after the level is pulled to be high, hardware PWM, Pin 16 of the IC|
|8||VD33||P||Power supply pin (3.3V)|
|9||GND||P||Power supply reference ground|
|10||ADC||AI||ADC port, the maximum input voltage is 5V|
|11||GPIOA_29||I/O||UART_Log_RXD (used to print the internal information of the module), which can be configured as a universal GPIO. The module has been pulled up. The pin cannot be triggered at high level|
|12||GPIOA_30||I/O||UART_Log_TXD (used to print the internal information of the module), which can be configured as a universal GPIO|
|13||GPIOA_5||I/O||GPIOA_5, hardware PWM, Pin 28 of IC|
|14||GPIOA_12||I/O||GPIOA_12, hardware PWM, Pin 17 of IC|
|15||RXD||I/O||UART0_RXD (user-side serial interface)|
|16||TXD||I/O||UART0_TXD (user-side serial interface)|
Note: P indicates power supply pins, I/O indicates input/output pins and AI indicates analog input pins.
|Parameter||Description||Minimum value||Maximum value||Unit|
|VBAT||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|
|VBAT||Power supply voltage||3.0||3.3||3.6||V|
|VIL||I/O low-level input||-0.3||-||VCC*0.25||V|
|VIH||I/O high-level input||VCC*0.75||-||VCC||V|
|VOL||I/O low-level output||-||-||VCC*0.1||V|
|VOH||I/O high-level output||VCC*0.8||-||VCC||V|
|Imax||I/O drive current||-||-||16||mA|
|Working status||Mode||Rate||Transmit power/Receive||Average value||Peak value (Typical value)||Unit|
|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 flashes fast||115||376||mA|
|Paring with the network with the hotspot||The module is paring with the network with the hotspot and the Wi-Fi indicator flashes slowly||60||386||mA|
|Connected||The module is connected to the network and the Wi-Fi indicator is always on||105||389||mA|
|Disconnected||The module is disconnected and the Wi-Fi indicator is off||45||381||mA|
|Working frequency||2.412 to 2.480 GHz|
|Wi-Fi standard||IEEE 802.11/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; HT40 MCS 0 to 7|
|Antenna type||Onboard PCB antenna with the gain of 2.5 dBi|
2.4G TX performance
|Parameter||Minimum value||Typical value||Maximum value||Unit|
|Average RF output power, 802.11b CCK Mode 11M||-||17.5||-||dBm|
|Average RF output power, 802.11g OFDM Mode 54M||-||14.5||-||dBm|
|Average RF output power, 802.11n Mode||-||13.5||-||dBm|
|Parameter||Minimum value||Typical value||Maximum value||Unit|
|PER<8%, RX sensitivity, 802.11b DSSS Mode 11M||-||-91||-||dBm|
|PER<10%, RX sensitivity, 802.11a/g OFDM Mode 54M||-||-75||-||dBm|
|PER<10%, RX sensitivity, 802.11n OFDM Mode HT20-MCS7||-||-72||-||dBm|
WR3 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.
To ensure antenna performance, the antenna area in the PCB should not be routed or clad with copper. The main points of the layout: 1. Make sure that there is no substrate medium directly below or above the printed antenna. 2. Make sure that the area around the printed antenna is far away from copper, so as to ensure the radiation effect of the antenna to the greatest extent.
For the antenna area of the PCB of the module, see the diagram of mechanical dimensions.
The PCB dimensions are 16±0.35 mm (W)×24±0.35 mm (L) ×0.8±0.1 mm (H).
Note: The default dimensional tolerance is ±0.35 mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication.
Optionally, WR3 can use the SMT.
The moisture-proof bag must be 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.
Set oven temperatures according to the following temperature curve of reflow soldering. The peak temperature is 245°C.
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)||Shipping packaging method||Number of modules per reel (pcs)||Number of reels per carton (reel)|
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-WR3. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR3”.
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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