CR3L-IPEX Module Datasheet

Last Updated on : 2021-08-13 06:38:20download

CR3L-IPEX is a low-power embedded Wi-Fi+Bluetooth LE module that Tuya has developed. It consists of a highly integrated RF chip (RTL8720CM), with an embedded Wi-Fi network protocol stack and rich library functions.


With the maximum CPU clock rate of 100MHz, CR3L-IPEX contains a low-power KM4 MCU, a WLAN MAC, a 1T1R WLAN module, 4-MB SRAM, 4-MB flash memory, and extensive peripherals.

CR3L-IPEX 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.


  • Embedded low-power KM4 MCU, which can also function as an application processor
  • Clock rate: 100MHz
  • Operating voltage: 3.0 to 3.6 V
  • Peripherals: 9 GPIOs, 1 UART, and 1 Log_Tx
  • Wi-Fi/BT connectivity
    • 802.11 B/G/N20
    • Channels 1 to 14 at 2.4 Ghz (channels 1 to 11 for US/CA and channels 1 to 13 for EU/CN)
    • Support WEP/WPA/WPA2/WPA2 PSK (AES) security modes
    • Support Bluetooth LE 4.2
    • +20 dBm output power in 802.11b mode
    • Support SmartConfig for Android and iOS devices
    • IPEX antenna
    • Passed CE and FCC certifications
    • Operating temperature: -40℃ to 105℃


  • Intelligent building
  • Smart household and home appliances
  • Smart socket and light
  • Industrial wireless control
  • Baby monitor
  • Network camera
  • Intelligent bus

Change history

Date Updated content Version after update
3/8/2021 This is the first release. V1.0.0

Module interfaces

Dimensions and footprint

CR3L-IPEX has two lines of pins with a pin spacing of 2 mm. Each line has 8 pins. The CR3L-IPEX dimensions are 16±0.35 mm (W)×24±0.35 mm (L) ×2.8±0.15 mm (H), which are shown as below:

CR3L-IPEX Module Datasheet

CR3L-IPEX Module Datasheet

Pin definition

Pin number Symbol I/O type Function
1 RST I/O Reset pin, which is connected to the enabling pin inside the module.
2 NC I/O The pin is not connected to anything.
3 EN I/O Enabling pin, active at high level. The module has been pulled up, so users can control the pin externally.
4 A_20 I/O GPIOA_20, GPIO, IC Pin1
5 A_2 I/O GPIOA_2, hardware PWM, IC Pin 18
6 A_3 I/O GPIOA_3, hardware PWM, IC Pin 19
7 A_4 I/O GPIOA_4, hardware PWM, IC Pin 20
8 VD33 P Power supply pin (3.3V)
9 GND P Power supply reference ground
10 A_15 I/O GPIOA_15, common pin, IC Pin 36
11 A_16 I/O GPIOA_16, UART_Log_TXD, which is used for displaying the module internal information and can be configured as a common GPIO
12 A_17 I/O GPIOA_17, hardware PWM, IC Pin 38
13 A_18 I/O GPIOA_18, hardware PWM, IC Pin 39
14 A_19 I/O GPIOA_19, hardware PWM, IC Pin 40
15 RXD I/O GPIOA_13, UART0_RXD, which is used as a user-side serial port
16 TXD I/O GPIOA_14, UART0_TXD, which is used as a user-side serial port

Note: P indicates power supply pins and I/O indicates input/output pins. Test points A0 and A1 are prohibited.

Electrical parameters

Absolute electrical parameters

Parameter Description Minimum value Maximum value Unit
Ts Storage temperature -40 125
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

Operating conditions

Parameter Description Minimum value Typical value Maximum value Unit
Ta Operating temperature -20 - 105
VDD Operating voltage 3.0 - 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 - - 0.4 V
VOH I/O high-level output 2.4 - - V
Imax I/O drive current - - 16 mA
Cpad Input pin capacitance - 2 - pF

RF power consumption

TX power consumption:

Symbol Mode power Average value Peak value (Typical value) Unit
RF 11b 1Mbps 16dBm 301 323 mA
RF 11b 11Mbps 16dBm 246 258 mA
RF 11g 6Mbps 14.5dBm 218 240 mA
RF 11g 54Mbps 14.5dBm 194 224 mA
RF 11n BW20 MCS0 13.5dBm 202 225 mA
RF 11n BW20 MCS7 13.5dBm 195 227 mA

RX power consumption:

Symbol Mode Average value Peak value (Typical value) Unit
IRF 11B 11M 61 68 mA
IRF 11G 54M 61 68 mA
IRF 11N HT20 MCS7 61 68 mA

Power consumption during operating

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 75 324 mA
Connected and idle state The module is connected to the network and the Wi-Fi indicator is always on 64 342 mA
Connected and operating state The module is connected to the network and the Wi-Fi indicator is always on 63 330 mA
Disconnected state The module is disconnected and the Wi-Fi indicator is dark 66 309 mA

RF parameters

Basic RF features

Parameter Description
Frequency range 2.400 to 2.4835 GHz
Wi-Fi standard IEEE 802.11b/g/n (channels 1 to 14)
Bluetooth LE standard Bluetooth V4.2
Data transmission rate 11b:1, 2, 5.5, 11 (Mbps)
Data transmission rate 11g: 6, 9, 12, 18, 24, 36, 48, 54 (Mbps)
Data transmission rate 11n: HT20 MCS 0 to 7
Antenna Type IPEX antenna with a gain of 3.3 dBi

TX performance

Parameter Minimum value Typical value Maximum value Unit
Average RF output power, 802.11b CCK Mode, 1 Mbit/s - 16 - dBm
Average RF output power, 802.11g OFDM mode, 54 Mbit/s - 14.5 - dBm
Average RF output power, 802.11n OFDM mode, MCS7 - 13.5 - dBm
Average RF output power, Bluetooth LE V4.2, 1 Mbit/s - 6.5 - dBm
Frequency error -20 - 20 ppm
EVM@802.11b CCK 11Mbps Mode 17.5 dBm - - -10 dB
EVM@802.11g OFDM 54Mbps Mode 14.5dBm - - -29 dB
EVM@802.11n OFDM MCS7 Mode 13.5dBm - - -30 dB

RX performance

Parameter Minimum value Typical value Maximum value Unit
PER<8%, RX sensitivity, 802.11b CCK Mode 1M - -91 - dBm
PER<10%, RX sensitivity, 802.11g OFDM Mode 54M - -75 - dBm
PER<10%, RX sensitivity, 802.11n OFDM Mode MCS7 - -72 - dBm
PER<10%, RX sensitivity, Bluetooth LE 4.2 1M - -93 - dBm


Antenna type

CR3L-IPEX uses only the IPEX antenna with a gain of 3.3 dBi.

Antenna interference reduction

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.

CR3L-IPEX Module Datasheet

Packaging information and production instructions

Mechanical dimensions

The mechanical dimensions of the PCB of CR3L-IPEX are 16±0.35 mm (W)×24±0.35 mm (L) ×0.8±0.1 mm (H).

CR3L-IPEX Module Datasheet
CR3L-IPEX Module Datasheet

CR3L-IPEX Module Datasheet

Note: The default dimensional tolerance is ±0.35 mm. If you have specific requirements on key dimensions, make them clear in the datasheet after communication.

Recommended PCB footprint

The schematic diagram of correspondence of pins of CR3L-IPEX

CR3L-IPEX Module Datasheet

The PCB footprint of CR3L-IPEX is shown as below:

CR3L-IPEX Module Datasheet

Production instructions

  1. The Tuya SMT module should be mounted by the SMT device. After being unpacked, it should be soldered within 24 hours. Otherwise, it should be put into the drying cupboard where the RH is not greater than 10%; or it needs to be packaged under vacuum again and the exposure time needs to be recorded (the total exposure time cannot exceed 168 hours).
    • SMT devices:
      • Mounter
      • SPI
      • Reflow soldering machine
      • Thermal profiler
      • Automated optical inspection (AOI) equipment
    • Baking devices:
      • Cabinet oven
      • Anti-electrostatic and heat-resistant trays
      • Anti-electrostatic and heat-resistant gloves
  2. Storage conditions for a delivered module:
    • 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.

      CR3L-IPEX Module Datasheet

  3. The module needs to be baked in the following cases:
    • The packaging bag is damaged before unpacking.
    • There is no HIC in the packaging bag.
    • After unpacking, circles of 10% and above on the HIC become pink.
    • The total exposure time has lasted for over 168 hours since unpacking.
    • More than 12 months has passed since the sealing of the bag.
  4. Baking settings:
    • Temperature: 60°C and ≤ 5% RH for reel package and 125°C and ≤5% RH for tray package (please use the heat-resistant tray rather than plastic container)
    • Time: 48 hours for reel package and 12 hours for tray package
    • Alarm temperature: 65°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 the reflow 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.
  5. In the whole production process, take electrostatic discharge (ESD) protective measures.
  6. To guarantee the passing rate, it is recommended that you use the SPI and AOI to monitor the quality of solder paste printing and mounting.

Recommended oven temperature curve

Set oven temperatures according to the following temperature curve of reflow soldering. The peak temperature is 245°C.

CR3L-IPEX Module Datasheet

  • 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.

Storage conditions

CR3L-IPEX Module Datasheet

MOQ and packaging information

Product model MOQ (pcs) Packaging method Number of modules per reel Number of reels per carton
CR3L-IPEX 3600 Tape reel 900 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 into 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 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-CR3L-IPEX. The end product must be labeled in a visible area with the following: “Contains Transmitter Module FCC ID: 2ANDL-CR3L-IPEX”.

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

CR3L-IPEX Module Datasheet

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

CR3L-IPEX Module Datasheet

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.