WR2L Module Datasheet

WR2L is a low-power built-in Wi-Fi module developed by Tuya. 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 rich library functions.

Overview

WR2L contains a low power-consumption ARM CM4F, a WLAN MAC, a 1T1R WLAN, and the maximum basic frequency of 62.5 MHz, and is embedded with a 256 KB SRAM, a 2 MB flash, and rich peripheral resources.

WR2L 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.

Features

• Built-in low power-consuming 32-bit CPU functioning as an application processor
• Clock rate: 62.5 MHz
• Operating voltage: 3 V to 3.6 V
• Peripherals: 5 GPIOs
• Wi-Fi connectivity
  • 802.11 b/g/n20/n40
  • Channels 1 to 14@2.4 GHz
  • WEP/WPA/WPA2/WPA2 PSK (AES) security mode
  • Up to +20 dBm output power in 802.11b mode
  • SmartConfig mode (for Android and iOS devices)
  • Onboard PCB antenna with a gain of 2.5 dBi
  • Passed CE, FCC, and SRRC certifications
  • Operating temperature: –20°C to +105°C

Application fields

• Intelligent building
• Intelligent home and household appliances
• Healthcare
• Industrial wireless control
• Baby monitor
• Network camera
• Intelligent bus

Module interfaces

Dimensions and pin layout

WR2L has two lines of pins with a distance of 2 mm between every two pins.

WR2L dimensions: 15±0.35 mm (W) x 17.37±0.35 mm (L) x 4.9±0.15 mm (H).

Pin definition

No.	Symbol	I/O type	Function
1	GPIOA_15	I/O	GPIOA_15, hardware PWM, corresponding to Pin 14 on the IC
2	GPIOA_14	I/O	GPIOA_14, hardware PWM, corresponding to Pin 13 on the IC
3	GPIOA_5	I/O	GPIOA_5, hardware PWM, corresponding to Pin 28 on the IC
4	GPIOA_19	I/O	GPIOA_19
5	GPIOA_12	I/O	GPIOA_12, hardware PWM, corresponding to Pin 17 on the IC
6	GND	P	Power supply reference ground pin
7	VD33	P	Module power supply pin (3.3 V)

Note: P indicates power-supply pins and I/O indicates input/output pins.

Electrical parameters

Absolute electrical parameters

Parameter	Description	Minimum value	Maximum value	Unit
Ts	Storage temperature	–40	125	°C
VDD	Supply voltage	–0.3	3.6	V
ESD voltage (human body model)	TAMB – 25°C	-	2	kV
ESD voltage (machine model)	TAMB – 25°C	-	0.5	kV

Working conditions

Parameter	Description	Minimum value	Typical value	Maximum value	Unit
Ta	Operating temperature	–20	-	105	°C
VDD	Operating voltage	3.0	-	3.6	V
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

Wi-Fi TX power consumption

Working status	Mode	Rate	Transmit power/Receive	Average value	Peak value (Typical value)	Unit
Transmit	11b	11Mbps	+17dBm	287	367	mA
Transmit	11b	11Mbps	+18dBm	295	382	mA
Transmit	11g	54Mbps	+15dBm	255	406	mA
Transmit	11g	54Mbps	+17.5dBm	267	428	mA
Transmit	11n-HT20	MCS7	13dBm	244	395	mA
Transmit	11n-HT20	MCS7	16.5dBm	257	422	mA
Transmit	11n-HT40	MCS7	13dBm	220	393	mA
Transmit	11n-HT40	MCS7	16.5dBm	230	420	mA

Wi-Fi RX power consumption

Symbol	Mode	Typical value	Unit
Receive	CPU sleep	90	mA
Receive	CPU active	120	mA

Power consumption in working mode

Working mode	Working status (Ta = 25°C)	Average value	Typical value (Peak value)	Unit
Fast network configuration	The module is in fast network configuration state, and the Wi-Fi indicator light flashes fast.	115	376	mA
Network configuration via hotspot	The module is in the state of network configuration via hotspot, and the Wi-Fi indicator light flashes slowly.	60	386	mA
Idle	The module is in connected state, and the Wi-Fi indicator light is always on.	105	389	mA
Operating	The module is in connected state, and the Wi-Fi indicator light is always on.	105	389	mA
Disconnected	The module is in disconnected state, and the Wi-Fi indicator light is always off.	45	381	mA

Note: The peak duration is about 5 µs. The above parameters vary with different firmware.

RF features

Basic RF features

Parameter	Description
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	PCB antenna with the gain of 2.5 dBi

Wi-Fi output power

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
Frequency error		–10	-	10	ppm

Wi-Fi 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

Antenna

Antenna types

WR2L uses the onboard PCB antenna with a gain of 2.5 dBi.

Antenna interference reduction

When using an onboard PCB antenna on a Wi-Fi module, to ensure optimal Wi-Fi performance, it is recommended that the antenna on the module be at least 15 mm away from other metal parts.

Avoid wiring or laying copper at the antenna area of the PCB. During layout, you should pay attention to the following points:

• Ensure that there is no substrate medium below or above the antenna.
• There is no copper around the antenna.

Packaging and production instructions

Mechanical dimensions

Recommended PCB footprint

Production instructions

• For the in-line module developed by Tuya, wave soldering equipment 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).

• Soldering equipment and materials:

  • Wave soldering equipment
  • Wave soldering fixture
  • Constant-temperature soldering iron
  • Tin bar, tin wire, and flux
  • Oven temperature tester

• Baking equipment:

  • Cabinet oven
  • Anti-static heat-resistant pallets
  • Anti-static heat-resistant gloves

• The module needs to be baked in the following cases:

  • The vacuum packing bag was found to be damaged before being unpacked.
  • There is no humidity indicator card (HIC) in the vacuum packing bag.
  • After being unpacked, 10% and above circles on the HIC become pink.
  • The total exposure time has been more than 168 hours since unpacking.
  • More than 12 months have passed since the sealing date of the bag.

• Baking settings:

  • Temperature: 40°C and ≤ 5% RH for reel package and 125°C and ≤5% RH for tray package (please use the heat-resistant tray rather than a plastic container)
  • Time: 168 hours for reel package and 12 hours for tray package
  • Alarm temperature: 50°C for reel package and 135°C for tray package
  • Production-ready temperature after natural cooling: < 36°C
  • Re-baking situation: If a module remains unused for over 168 hours after being baked, it needs to be baked again.
  • If a batch of modules is not baked within 168 hours, do not use wave soldering to solder them. Because these modules are Level-3 moisture-sensitive devices, they are very likely to get damp when exposed beyond the allowable time. In this case, if they are soldered at high temperatures, it may result in device failure or poor soldering.

• 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.
  • Whether the wave soldering oven temperature curve is reasonable.

Recommended oven temperature curve and temperature

For oven temperature settings, refer to oven temperatures for wave soldering. The peak temperature is 260°C±5°C. The wave soldering temperature curve is shown below:

Recommended soldering temperature:

Recommended wave soldering oven temperature		Recommended 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
Ramp-up slope	≤2°C/s	NA	NA
Ramp-down slope	≤6°C/s	NA	NA

Storage conditions

Storage conditions for a delivered module are as follows:

• 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.

• The package contains a humidity indicator card (HIC).

  

  

MOQ and packaging information

Product model	MOQ (pcs）	Packing method	Number of modules in per reel	Number of reels in per carton
WR2L	2800	Tape reel	700	4

Appendix: Statement

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:

• Reorient or relocate the receiving antenna.
• Increase the separation between the device and receiver.
• Connect the device to 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 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.

Important Note

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 to 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-WR2L. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR2L”.

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 from the human body.