Last Updated on : 2022-08-23 10:32:15download
WR3L is a low power built-in Wi-Fi module developed by Hangzhou Tuya Information Technology Co., Ltd. It consists of a highly integrated radio frequency chip (RTL8710BX) and an external flash chip, with a built-in Wi-Fi network protocol stack and robust library functions. WR3L also contains a low power-consuming ARM CM4F, a WLAN MAC, a 1T1R WLAN, and the maximum basic frequency of 125 MHz, and is embedded with a 256 KB SRAM, a 2 MB flash, and robust peripheral resources.
WR3L 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.
Figure 1.1 shows the schematic diagram of WR3L.
Built-in low power-consuming 32-bit CPU functioning as an application processor
WR3L provides two lines of pins (2 x 8) with a distance of 2 mm between every two pins.
WR3L dimensions: 16±0.35 mm (W)×24±0.35 mm (L) ×3.4±0.15 mm (H) (see the following figure)
Table 2.1 describes the common pins.
|1||NC||/||Disconnected to be compatible with other modules|
|3||CHIP_EN||I/O||The pin function is disabled by firmware. The user can choose not to connect.|
|5||GPIOA_14||I/O||GPIOA_14, used for hardware PWM|
|6||GPIOA_15||I/O||GPIOA_15, used for hardware PWM|
|7||GPIOA_0||I/O||GPIOA_0, which cannot be pulled up during power-on and can be configured after power-on. It is used for hardware PWM.|
|8||VD33||P||Module power supply pin (3.3 V)|
|9||GND||P||Power supply reference ground pin|
|10||ADC||AI||ADC port, with the maximum input voltage of 5 V|
|11||GPIOA_29||I/O||UART_Log_RXD (used for printing the internal information of the module)|
|12||GPIOA_30||I/O||UART_Log_TXD (used for printing the internal information of the module)|
|13||GPIOA_5||I/O||GPIOA_5, used for hardware PWM|
|14||GPIOA_12||I/O||GPIOA_12, used for hardware PWM|
|15||RXD||I/O||UART0_RXD (user’s serial port)|
|16||TXD||I/O||UART0_TXD (user’s serial port)|
Note: P indicates power-supply pins, I/O indicates input/output pins, and AI indicates analog input pins.
Table 3.1 Absolute parameters
|Parameter||Description||Minimum value||Maximum value||Unit|
|ESD voltage (human body model)||TAMB – 25°C||-||2||kV|
|ESD voltage (machine model)||TAMB – 25°C||-||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 x 0.25||V|
|VIH||I/O high-level input||VDD x 0.75||-||3.6||V|
|VOL||I/O low-level output||-||-||VDD x 0.1||V|
|VOH||I/O high-level output||VDD x 0.8||-||VDD||V|
|Imax||I/O drive current||-||-||16||mA|
|Cpad||Input pin capacitance||-||2||-||pF|
Table 3.3 TX power during constant emission
|IRF||11b 11 Mbit/s||17 dBm||287||mA|
|IRF||11b 11 Mbit/s||18 dBm||295||mA|
|IRF||11g 54 Mbit/s||15 dBm||255||mA|
|IRF||11g 54 Mbit/s||17.5 dBm||267||mA|
|IRF||11n BW20 MCS7||13 dBm||244||mA|
|IRF||11n BW20 MCS7||16.5 dBm||257||mA|
|IRF||11n BW40 MCS7||13 dBm||220||mA|
|IRF||11n BW40 MCS7||16.5 dBm||230||mA|
Table 3.4 RX power during constant receiving
Table 3.5 Operating current
|Working mode||Working status (Ta = 25°C)||Typical value||Maximum value||Unit|
|EZ mode||The module is in the EZ state and the Wi-Fi indicator fast flashes.||115||125||mA|
|Idle mode||The module is in the connected state and the Wi-Fi indicator is steady on.||60||209||mA|
|Working mode||The module is in the connected state and the Wi-Fi indicator is steady on.||118||198||mA|
|Disconnection mode||The module is in the disconnected state and the Wi-Fi indicator is steady off.||34||192||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 band||2.400 GHz to 2.4835 GHz|
|Wi-Fi standard||IEEE 802.11b/g/n (channels 1 to 14)|
|Data transmission rate||11b: 1, 2, 5.5, 11 (Mbit/s)
11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbit/s)
11n: HT20 MCS0 to MCS7
11n: HT40 MCS0 to MCS7
|Antenna type||Onboard PCB antenna|
Table 4.2 TX power during constant emission
|Parameter||Minimum value||Typical value||Maximum value||Unit|
|RF average output power, 802.11b CCK mode||11 Mbit/s||-||17.5||-||dBm|
|RF average output power, 802.11g OFDM mode||54 Mbit/s||-||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||11 Mbit/s||-||–91||-||dBm|
|PER < 10%, RX sensitivity, 802.11g OFDM mode||54 Mbit/s||-||–75||-||dBm|
|PER < 10%, RX sensitivity, 802.11n OFDM mode||MCS7||-||–72||-||dBm|
Only the onboard PCB antenna is used.
When using an onboard PCB antenna on a Wi-Fi module, make sure that the antenna on the module is at least 15 mm away from other metal parts to ensure optimal wireless performance.
Figure 6.3 Pin mapping
Figure 6.4 Module PBC Encapsulation
WR3L provides models with and without pin headers, respectively, which can be used as required.
The following figure shows the pin header dimensions and recommended layout (unit: mm).
The moisture-proof bag must be placed in an environment in which 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.
Select a proper soldering manner according to the process. For the SMT process, please refer to the recommended oven temperature curve of reflow soldering. For the wave soldering process, please refer to the recommended oven temperature curve of wave soldering. There are some differences between the set temperatures and the actual temperatures. All the temperatures shown in this module datasheet are obtained through actual measurements.
Manner 1: SMT process (Recommended oven temperature curve of reflow soldering)
Set oven temperatures according to the following curve.
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.
Manner 2: Wave soldering process (Oven temperature curve of wave soldering)
Set oven temperatures according to the following temperature curve of wave soldering. The peak temperature is 260°C±5°C.
|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|
|Product Number||MOQ (pcs)||Shipping packaging method||The number of modules per reel (pcs)||The 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 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-WR3L. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR3L”.
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 complies 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, following 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 a municipal recycling collection point.
The device could be used with a separation distance of 20cm from the human body.
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