WR11-2S Module Datasheet

WR11-2S module is a Wi-Fi and Bluetooth Low Energy (LE) combo module developed by Tuya Smart. It consists of a highly integrated wireless RF chip RTL8711DAF and a few peripheral components, with built-in Wi-Fi and Bluetooth network protocol stacks and various library functions.

Overview

The module is built around a 32-bit low power MCU with 512 KB SRAM, built-in 4 MB flash memory, and various peripheral resources.

WR11-2S is a real-time operating system (RTOS), integrated with all Wi-Fi MAC and TCP/IP libraries. All these resources can help you develop your own embedded Wi-Fi products.

Features

• Built-in low-power 32-bit CPU that also acts as an application processor.
• Clock rate of up to 345 MHz.
• Operating voltage range: 3.3 ± 0.3V.
• Peripherals: 5 PWM pins, 2 UART pins, and 1 ADC pin.
• Wi-Fi connectivity
  • IEEE 802.11a/ b/g/n 1x1, 2.4 GHz and 5 GHz.
  • Channels 1 to 14 at 2.4 GHz, 36-177 at 5 GHz.
  • Support security protocols, including WEP, WPA, WPA2, WPA2 PSK (AES), and WPA3.
  • The maximum output power is +19 dBm for IEEE 802.11b and +17 dBm for 802.11n transmission.
  • Support STA, AP, and STA + AP combo working modes.
  • Two pairing modes are supported, namely Wi-Fi Easy Connect (EZ mode) and access point (AP) mode. Both modes are suitable for pairing with Android and iOS devices.
  • Onboard PCB antenna with a gain of 0.95 dBi at 2.4 GHz, and 0.7 dBi at 5 GHz.
  • Operating temperature range: -40°C to 105°C.
• Bluetooth connectivity
  • Support Bluetooth 5.0.
  • Up to +10 dBm output power.
  • Onboard PCB antenna with a gain of 0.95 dBi at 2.4 GHz, and sharing the same antenna with Wi-Fi.
  • Operating temperature range: -40°C to 105°C.

Scope of applications

• Smart building
• Smart home and electrical appliance
• Smart socket and light
• Industrial wireless control
• Baby monitor
• IP camera
• Smart bus

Module interfaces

Dimensions and footprint

The WR11-2S dimensions are 14.99±0.35mm (W) × 17.91±0.35mm (L) × 3.45±0.15mm (H).
The following figure shows the dimensions and packaging design of the WR11-2S module.

Pin definition

Pin	Symbol	I/O type	Feature
1	3V3	P	3.3V power pin.
2	PB19	I/O	Support hardware PWM, corresponding to Pin 39 on the IC.
3	GND	P	Ground pin.
4	PB18	I/O	Support hardware PWM, corresponding to Pin 38 on the IC.
5	RX0	I/O	UART_RX0 to receive user data, corresponding to PB21 (Pin 41) on the IC.
6	PA26	I/O	Support hardware PWM, corresponding to Pin 12 on the IC.
7	TX0	I/O	UART_TX0 to send user data, corresponding to PB20 (Pin 40) on the IC.
8	PB17	I/O	ADC pin, corresponding to PB17 (Pin 37) on the IC.
9	PA30	I/O	Support hardware PWM, corresponding to Pin 16 on the IC.
10	CEN	I	The reset pin, active low, and pulled up internally. Corresponding to Pin 44 on the IC.
11	PA29	I/O	Support hardware PWM, corresponding to Pin 15 on the IC.
TP2	TX1	I/O	UART_TX1 to print logs, corresponding to PB5 (Pin 35) on the IC.
TP3	RX1	I/O	UART_RX1 to print logs, corresponding to PB4 (Pin 34) on the IC.

Electrical parameters

Absolute electrical parameters

Parameter	Description	Min value	Max value	Unit
Ts	Storage temperature	-40	125	°C
VBAT	Supply voltage	3.0	3.6	V
Electrostatic discharge voltage (human body model)	TAMB -25°C	-	2	kV
Electrostatic discharge voltage (machine model)	TAMB -25°C	-	0.5	kV

Normal operating conditions

Parameter	Description	Min value	Typical value	Max value	Unit
Ta	Operating temperature	-40	-	105	°C
VBAT	Supply voltage	3.0	3.3	3.6	V
VIL	I/O low-level input	-	-	0.8	V
VIH	I/O high-level input	2.0	-	-	V
VOL	I/O low-level output	0	-	0.3	V
VOH	I/O high-level output	2.8	-	3.6	V
Imax	I/O drive current	-	-	12	mA

Power consumption during continuous transmission and reception

2.4 GHz transmission and reception

Operating status	Mode	Rate	Transmit/Receive power	Typical value	Unit
Transmit	802.11b	11 Mbit/s	+19 dBm	259	mA
Transmit	802.11g	54 Mbit/s	+18 dBm	241	mA
Transmit	802.11n-HT20	MCS7	+17 dBm	221	mA
Transmit	802.11n-HT40	MCS7	+17 dBm	232	mA
Receive	802.11b	11 Mbit/s	Continuous reception	55	mA
Receive	802.11g	54 Mbit/s	Continuous reception	55	mA
Receive	802.11n-HT20	MCS7	Continuous reception	55	mA
Receive	802.11n-HT40	MCS7	Continuous reception	55	mA

5 GHz transmission and reception

Operating status	Mode	Rate	Transmit/Receive power	Typical value	Unit
Transmit	802.11a	54 Mbit/s	+17 dBm	293	mA
Transmit	802.11n-HT20	MCS7	+16 dBm	290	mA
Transmit	802.11n-HT40	MCS7	+16 dBm	290	mA
Receive	802.11a	54 Mbit/s	Continuous reception	61	mA
Receive	802.11n-HT20	MCS7	Continuous reception	60	mA
Receive	802.11n-HT40	MCS7	Continuous reception	66	mA

Operating current

Working mode	Status (Ta = 25°C)	Average value	Max (Typical) value	Unit
Pairing in EZ mode	The module is in EZ mode. The network status indicator blinks quickly.	57	184	mA
Pairing in AP mode	The module is in AP mode. The network status indicator blinks slowly.	203	392	mA
Connected	The module is connected to the cloud. The network status indicator is steady on.	55	98	mA
Disconnected	The module is disconnected from the cloud. The network status indicator is steady off.	53	59	mA

RF parameters

Basic RF features

Parameter	Description
Operating frequency	2.412–2.484 GHz, 5.180–5.885 GHz
Wi-Fi standard	IEEE 802.11a/b/g/n (channels 1–14, and 36–177)
Data transmission rate	IEEE 802.11b: 1, 2, 5.5, and 11 Mbit/s IEEE 802.11a/g: 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s IEEE 802.11n: HT20 MCS0-7 and HT40 MCS0-7
Antenna type	Onboard PCB antenna with a gain of 0.95 dBi at 2.4 GHz, and 0.7 dBi at 5 GHz.

Transmitter (TX) performance

2.4 GHz continuous transmission performance

Parameter	Min value	Typical value	Max value	Unit
RF average output power, 802.11b CCK mode, 11 Mbit/s	-	19	-	dBm
RF average output power, 802.11g OFDM mode, 54 Mbit/s	-	18	-	dBm
RF average output power, 802.11n HT20 mode, MCS7	-	17	-	dBm
RF average output power, 802.11n HT40 mode, MCS7	-	17	-	dBm
Frequency error	-10	-	10	ppm

5 GHz continuous transmission performance

Parameter	Min value	Typical value	Max value	Unit
RF average output power, 802.11a OFDM mode, 54 Mbit/s	-	17	-	dBm
RF average output power, 802.11n HT20 mode, MCS7	-	16	-	dBm
RF average output power, 802.11n HT40 mode, MCS7	-	16	-	dBm
Frequency error	-10	-	10	ppm

Receiver (RX) performance

RX sensitivity

Parameter	Min value	Typical value	Max value	Unit
PER < 8%, RX sensitivity, 802.11b DSSS mode, 11 Mbit/s	-	-88	-	dBm
PER < 10%, RX sensitivity, 802.11a/g OFDM mode, 54 Mbit/s	-	-77	-	dBm
PER < 10%, RX sensitivity, 802.11n OFDM mode, HT20-MCS7	-	-75	-	dBm

Antenna information

Antenna type

Only PCB antenna applies.

Antenna interference reduction

When a PCB antenna is used on a Wi-Fi module, we recommend that the module antenna is at least 15 mm away from other metal components. This can optimize the Wi-Fi performance.

Make sure that the enclosure surrounding the antenna is not traced or filled with copper. Otherwise, the RF performance might be degraded.
Layout principles: No substrate medium exists directly below or above the PCB antenna. The PCB antenna is away from the copper sheet. This can maximize the radiation effect of the antenna.

Packing and production instructions

Mechanical dimensions

Mechanical dimensions of the WR11-2S PCB are 14.99±0.35 mm (W) × 17.91±0.35 mm (L) × 3.45±0.15 mm (H).
The figure below shows the mechanical dimensions of WR11-2S.

Recommended PCB footprint

Production instructions

• For the modules that can be packaged with the surface-mount technology (SMT) or in in-line form, you can select either of them according to the PCB design solutions of customers. If a PCB is designed to be SMT-packaged, package the module with the SMT. If a PCB is designed to use an in-line package, use wave soldering. Complete soldering within 24 hours after the module is unpacked. Otherwise, we recommend that you place the module in a drying cupboard with a relative humidity level below 10%, or pack the module in vacuum again. Then, record the packing time and duration of exposure. The total exposure time cannot exceed 168 hours.

  • Instruments or devices required for the SMT process:
    • Surface mount system
    • SPI
    • Reflow soldering machine
    • Thermal profiler
    • Automated optical inspection (AOI) device
  • Instruments or devices required for the wave soldering process:
    • Wave soldering device
    • Wave soldering fixture
    • Constant-temperature soldering iron
    • Tin bar, tin wire, and flux
    • Thermal profiler
  • Instruments or devices required for the baking process:
    • Cabinet oven
    • Electrostatic discharge (ESD) protection and heat-resistant trays
    • ESD protection and heat-resistant gloves

• A delivered module must meet the following storage requirements:

  • 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.

  • A humidity indicator card (HIC) is put in the sealed package.

    

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

  • The vacuum packaging bag is damaged before unpacking.
  • After unpacking, no HIC is found in the packaging bag.
  • After unpacking, the HIC indicates a humidity level of 10% or higher. In this case, the circle turns pink on the HIC.
  • The total exposure time has lasted for over 168 hours since unpacking.
  • More than 12 months have passed since the first sealing of the bag.

• The baking parameter settings are described below:

  • Baking temperature: 40°C for reel packaging with relative humidity ≤ 5%. And 125°C for tray packaging with relative humidity ≤ 5% (use a heat-resistant tray, rather than a plastic container).
  • Baking time: 168 hours for reel packaging and 12 hours for tray packaging.
  • Temperature for triggering an alert: 50°C for reel packaging and 135°C for tray packaging.
  • Production can begin after a module has cooled down to below 36°C under natural conditions.
  • 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 after exposure for more than 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, device failure or poor soldering performance might occur.

• In the whole production process, take electrostatic discharge (ESD) protective measures.

• To guarantee the pass rate, we recommend that you use the SPI and AOI to monitor the quality of solder paste printing and mounting.

Recommended oven temperature curve

Select a proper soldering technique according to the process. For more information, refer to the recommended oven temperature curve of either reflow soldering or wave soldering. The set temperatures might deviate from the actual temperature measurements. All temperatures shown in this module datasheet are obtained through actual measurements.

Technique 1: SMT process (recommended oven temperature curve of reflow soldering)

Set the oven temperatures according to the following curve.

• A: temperature axis
• B: time axis
• C: alloy liquidus temperature from 217°C to 220°C
• D: ramp-up slope from 1°C/s to 3°C/s
• E: keep a constant temperature from 150°C to 200°C for a time period of 60s to 120s
• F: temperature above liquidus temperature for 50s to 70s
• G: peak temperature from 235°C to 245°C
• H: ramp-down slope from 1°C/s to 4°C/s

Technique 2: Wave soldering process (oven temperature curve of wave soldering)

Set the oven temperatures according to the following temperature curve of wave soldering. The peak temperature is 260°C±5°C.

Suggestions on wave soldering		Suggestions on manual repair soldering
Preheat temperature	80°C to 130°C	Soldering temperature	360°C ± 20°C
Preheat duration	75s to 100s	Soldering duration	Less than 3s/point
Contact duration at the peak	3s to 5s	N/A	N/A
Solder tank temperature	260°C ± 5°C	N/A	N/A
Ramp-up slope	≤ 2°C/s	N/A	N/A
Ramp-down slope	≤ 6°C/s	N/A	N/A

Storage conditions

MOQ and packaging information

Product model	MOQ (pcs)	Shipping packaging	Modules per reel	Reels per carton
WR11-2S	4,400	Tape and reel	1,100	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 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-WR11-2S. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-WR11-2S”.

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.