CR3L Module Datasheet Hardware Product Development > Network Modules > Wi-Fi & BLE Dual Mode Module Version: 20201208 Online Version
Contents Contents 1 Product overview 1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 2 2 Change history 3 3 Module interfaces 3.1 Dimensions and footprint . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Pin definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 5 4 Electrical parameters 4.1 Absolute electrical parameters 4.2 Working conditions . . . . . . 4.
Contents 8.6 Storage conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents CR3L is a low-power embedded WiFi+BLE module that Tuya has developed. It consists of a highly integrated wireless RF chip (RTL8720CM), with an embedded WiFi network protocol stack and varied library functions.
1 PRODUCT OVERVIEW 1 Product overview With the maximum CPU clock rate of 100MHz, CR3L also contains a low-power KM4 microcontroller unit (MCU), a WLAN MAC, a 1T1R WLAN module, 4-MB static randomaccess memory (SRAM), 4-MB flash memory, and extensive peripherals. CR3L is an RTOS platform that integrates all function libraries of the WiFi MAC and TCP/IP protocols. You can develop embedded WiFi products as required. 1.
3 MODULE INTERFACES 2 Change history Update Date Updated Content Version after Update 12/8/2020 This is the first release. V1.0.0 3 Module interfaces 3.1 Dimensions and footprint CR3L has two rows of pins with a 2 mm pin spacing. Each row has 8 pins. The CR3L dimensions are 16±0.35 mm (W)×24±0.35 mm (L) ×2.8±0.15 mm (H).
3 4 / 26 MODULE INTERFACES
3 MODULE INTERFACES 3.
3 MODULE INTERFACES Pin Number Symbol I/O Type Function 2 NC I/O It is pulled up to be compatible with other modules 3 EN I/O Enabling pin, which works at the high level and is pulled up and controlled by a user externally 4 A_20 I/O GPIOA_20, GPIO, IC Pin1 5 A_2 I/O GPIOA_2, hardware PWM, IC Pin18 6 A_3 I/O GPIOA_3, hardware PWM, IC Pin19 7 A_4 I/O GPIOA_4, hardware PWM, IC Pin20 8 VD33 P Power supply pin (3.
3 MODULE INTERFACES Pin Number Symbol I/O Type Function 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 Pin38 13 A_18 I/O GPIOA_18, hardware PWM, IC Pin39 14 A_19 I/O GPIOA_19, hardware PWM, IC Pin40 15 RXD I/O GPIOA_13, UART0_RXD, which is used as a user-side serial interface pin 16 TXD I/O GPIOA_14, UART0_TXD, which is used as a user-side serial interfa
4 ELECTRICAL PARAMETERS 4 Electrical parameters 4.1 Absolute electrical parameters Minimum Value Maximum Value Unit Parameter Description Ts Storage temperature -40 125 ℃ VDD Power supply voltage -0.3 3.6 V Static electricity discharge voltage (human body model) TAMB-25℃ - 2 KV Static electricity discharge voltage (machine model) TAMB-25℃ - 0.5 KV 4.
4 ELECTRICAL PARAMETERS Minimum Value Typical Value Maximum Value Unit Parameter Description 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 4.
4 ELECTRICAL PARAMETERS Peak Value (Typical Value) Unit Symbol Mode Average Value IRF 11B 11M 63 65 mA IRF 11G 54M 65 67 mA IRF 11N HT20 MCS7 65 67 mA Average Value Peak Value (Typical Value) Unit 4.
5 Working Mode Disconnected status Working Status (Ta = 25°C) The module is offline and the WiFi indicator is dark RF PARAMETERS Average Value Peak Value (Typical Value) Unit 66 309 mA 5 RF parameters 5.1 Basic RF features Parameter Description Frequency range 2.400 to 2.4835 GHz WiFi standard IEEE 802.11b/g/n (channels 1 to 14) BLE standard Bluetooth 4.
5 Typical Value Maximum Value Unit Average RF output power, 802.11b CCK Mode, 1 Mbit/s 17 - 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, BLE 4.2, 1 Mbit/s 6.5 - dBm Frequency error - 20 ppm EVM@802.11b CCK 11Mbps Mode 17.5dBm - -10 dB EVM@802.11g OFDM 54Mbps Mode 14.
5 Typical Value Maximum Value Unit - -30 dB Minimum Value Typical Value Maximum Value Unit - -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, BLE 4.2 1M -93 - dBm Parameter Minimum Value RF PARAMETERS EVM@802.11n OFDM MCS7 Mode 13.5dBm 5.3 RX performance Parameter PER<8%, RX sensitivity, 802.
6 ANTENNA 6 Antenna 6.1 Antenna type CR3L uses only an onboard PCB antenna with a gain of 1.88 dBi. 6.2 Antenna interference reduction To ensure optimal WiFi performance when the WiFi module uses an onboard PCB antenna, it is recommended that the antenna be at least 15 mm away from other metal parts.
7 POWER-ON SEQUENCE AND RESETTING 7 Power-on sequence and resetting 7.1 Power-on sequence The RTL8720CM chip has requirements on the power-on sequence. It is recommended that the voltage rises from 0 to 3.3V within 40mS. Minimum Value Typical Value Maximum Value Unit Symbol Parameter TPRDY 3.3V ready time 0.6 20 mS CHIP_EN CHIP_EN ready time 0.6 20 mS 7.2 Resetting When designing a plate of a module, you should set a reset IC at the foot of CHIP_EN in advance.
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8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 8 Packaging information and production instructions 8.1 Mechanical dimensions The mechanical dimensions of the PCB of CR3L are 16±0.35 mm (W)×24±0.35 mm (L) ×0.8±0.1 mm (H). The following figure shows the mechanical dimensions of CR3L.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS Note: The default dimensional tolerance is ±0.35 mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication. 8.2 Recommended PCB layout The following figure is a schematic diagram of CR3L which shows how pins correspond to each other.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 8.3 Pin header specifications CR3L has two models: CR3L with pin headers and CR3L without pin headers. Which one is used depends on actual situations.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 8.4 Production instructions 1. Tuya’s stamp hole package module must be mounted by an SMT machine within 24 hours after unpacking and programming of the firmware. Otherwise, it must be packaged again under a vacuum. The module must be baked before mounting.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 2. Storage conditions for a delivered module are as follows: • The moisture-proof bag is placed in an environment where the temperature is below 30°C and the relative humidity is lower than 70%. • The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed. • There is a humidity indicator card in the moisture-proof bag as below: 3.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 6. Before SMT, take electrostatic discharge (ESD) protective measures. 7. To reduce the reflow defect rate, draw 10% of the products for visual inspection and AOI before the first mounting to determine proper methods for controlling the oven temperature and attaching and placing components. Draw 5 to 10 modules from subsequent batches each hour for visual inspection and AOI. 8.
8 PACKAGING INFORMATION AND PRODUCTION INSTRUCTIONS 8.
10 APPENDIX: STATEMENT 9 MOQ and packaging information Product Number MOQ (pcs) Shipping packaging method CR3L 3600 Tape reel The number of modules per reel (pcs) The number of reels per carton (reel) 900 4 10 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.
10 APPENDIX: STATEMENT 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.
10 APPENDIX: STATEMENT 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.
