Table of Contents
Related Manuals for RF-Star RF-WM-20CMB1
Summary of Contents for RF-Star RF-WM-20CMB1
- Page 1 RF-WM-20CMB1 Ultra-Low-Power 2.4 GHz 802.11b/g/n WLAN Wi-Fi and BLE4.2 Module Version 1.0 Shenzhen RF-star Technology Co., Ltd. Jun. 28 , 2021 All rights reserved. Those responsible for unauthorized reproduction will be prosecuted.
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Page 2: Wi-Fi Module List
2. All modules with PCB / Chip antenna and IPEX connector are dispatched with PCB / Chip antenna only by default. If IPEX connector is needed, pls check with me before the quotation. Shenzhen RF-star Technology Co., Ltd. Page 1 of 24... -
Page 3: Device Overview
1.1 Description RF-WM-20CMB1 is an IoT wireless module based on Realtek Wi-Fi SoC RTL8720CM with Real-M300 (KM4) CPU. This module has on-chip 384 KB ROM, 256 KB RAM, 4 MB pSRAM and 2MB flash, a pin-out of peripherals of SDIO, SPI, UART, I C, PWM, GDMA and GPIOs. -
Page 4: Functional Block Diagram
Power Supply Reset 3.3 V Figure 1. Functional Block Diagram of RF-WM-20CMB1 1.5 Part Number Conventions The part numbers are of the form of RF-WM-20CMB1 where the fields are defined as follows: 20CM Company Name Module Version The First Version... -
Page 5: Table Of Contents
4.3.3 External Antenna Design Recommendation of the Half-Hole ANT Pin ......14 4.3.4 IPEX Connector Specification ......................16 4.4 Schematic Diagram ............................17 4.5 Basic Operation of Hardware Design ...................... 17 4.6 Trouble Shooting .............................. 18 4.6.1 Unsatisfactory Transmission Distance ..................18 Shenzhen RF-star Technology Co., Ltd. Page 4 of 24... -
Page 6: Table Of Figures
Figure 6. Recommendation of Antenna Layout ................... 13 Figure 7. IPEX Antenna Output Mode of RF-WM-20CMB1 ..............14 Figure 8. ANT Pin Antenna Output Mode of RF-WM-20CMB1 ............. 14 Figure 9. Reference Design of the External Antenna ................15 Figure 10. Reference Design of the External Antenna Traces .............. 15 Figure 11. -
Page 7: Table Of Tables
Table 1. Parameters of RF-WM-20CMB1 ......................7 Table 2. Pin Functions of RF-WM-20CMB1 ....................8 Table 3. GPIO Pin Function of RF-WM-20CMB1 ..................10 Table 4. Recommended Operating Conditions of RF-WM-20CMB1 ........... 11 Table 5. Handling Ratings of RF-WM-20CMB1 ................... 11 Table 6. -
Page 8: Module Configuration And Functions
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jan., 2020 2 Module Configuration and Functions 2.1 Module Parameters Table 1. Parameters of RF-WM-20CMB1 Chipset Realtek RTL8720CM Supply Power Voltage 2.3 V ~ 3.6 V, recommended to 3.3 V Wi-Fi: 2400 MHz ~ 2500 MHz... -
Page 9: Module Pin Diagram
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jan., 2020 2.2 Module Pin Diagram Figure 3. Pin Diagram of RF-WM-20CMB1 2.3 Pin Functions Table 2. Pin Functions of RF-WM-20CMB1 Name Description RFOUT RF signal output pin Ground Ground 3.3 V power supply GPIOA_0 GPIO, JTAG CLK... - Page 10 None connect None connect None connect GPIOA_17 GPIO GPIOA_18 GPIO GPIOA_19 GPIO GPIOA_20 GPIO GPIOA_23 GPIO GPIOA_15 GPIO, LOG UART RX GPIOA_16 GPIO, LOG UART TX None connect None connect Ground Shenzhen RF-star Technology Co., Ltd. Page 9 of 24...
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Page 11: Gpio Pin Function
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jan., 2020 2.4 GPIO Pin Function Table 3. GPIO Pin Function of RF-WM-20CMB1 Pin name SPIC-Flash/SDIO JTAG UART SPI/WL_LED JTAG_CLK GPIOA_0 UART1_IN PWM[0] JTAG_TMS PWM[1] GPIOA_1 UART1_OUT BT_LED JTAG_TDO PWM[2] GPIOA_2 UART1_IN SPI_CSn I2C_SCL JTAG_TDI SPI_SCL... -
Page 12: Specifications
Functional operation does not guarantee performance beyond the limits of the conditional parameter values in the table below. Long-term work beyond this limit will affect the reliability of the module more or less. Table 4. Recommended Operating Conditions of RF-WM-20CMB1 Items Condition Min. -
Page 13: Application, Implementation, And Layout
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jun., 2021 4 Application, Implementation, and Layout 4.1 Module Photos Figure 4. Photos of RF-WM-20CMB1 4.2 Recommended PCB Footprint Figure 5. Recommended PCB Footprint of RF-WM-20CMB1 (mm) Shenzhen RF-star Technology Co., Ltd. Page 12 of 24... -
Page 14: Antenna
Note: The hollow-out position is based on the antenna used. 4.3.2 Antenna Output Mode Modification 1. RF-WM-20CMB1 has three antenna output modes. An onboard PCB antenna, a stamp half-hole output (ANT pin, see pin function table for details) and one IPEX connecter. -
Page 15: External Antenna Design Recommendation Of The Half-Hole Ant Pin
If you want to use the external antenna by the ANT pin, pls solder a 0 R Resistor in the red rectangle. The location of the Resister is shown in the figure below. Figure 8. ANT Pin Antenna Output Mode of RF-WM-20CMB1 4.3.3 External Antenna Design Recommendation of the Half-Hole ANT Pin 1. -
Page 16: Figure 9. Reference Design Of The External Antenna
Example: FR4 is a double-layer board with a thickness of 1.0 mm. Through calculation, the width of the trace is 0.8254 mm, and the spacing between traces and copper is 0.22 mm. Figure 11. SI9000 Impedance Calculation Diagram Shenzhen RF-star Technology Co., Ltd. Page 15 of 24... -
Page 17: Ipex Connector Specification
V1.0 - Jun., 2021 4.3.4 IPEX Connector Specification RF-WM-20CMB1 module can be integrated with the IPEX version 1 antenna seat, the specification of the antenna seat is as follows: Figure 12. Specification of Antenna Seat The specification of the IPEX wire end is as follows: Figure 13. -
Page 18: Schematic Diagram
V1.0 - Jun., 2021 4.4 Schematic Diagram Figure 14. Schematic Diagram of RF-WM-20CMB1 4.5 Basic Operation of Hardware Design 1. It is recommended to offer the module a DC stabilized power supply, a tiny power supply ripple coefficient, and reliable ground. -
Page 19: Trouble Shooting
5. The low voltage of the power supply is lower than the recommended value at ambient temperature, and the lower the voltage, the smaller the power is. 6. The unmatchable antennas and modules or the poor quality of the antenna will affect the communication distance. Shenzhen RF-star Technology Co., Ltd. Page 18 of 24... -
Page 20: Vulnerable Module
3. If the extension wire or feeder wire is of poor quality or too long, the bit error rate will be high. 4.7 Electrostatics Discharge Warnings The module will be damaged by the discharge of static. RF-star suggests that all modules should follow the 3 precautions below: 1. -
Page 21: Figure 15. Recommended Reflow For Lead-Free Solder
Max. 6 ℃/s Time from 25 ℃ to Peak Temperature (t Max. 6 minutes Max. 8 minutes Time of Soldering Zone (t 20±10 s 20±10 s Figure 15. Recommended Reflow for Lead-Free Solder Shenzhen RF-star Technology Co., Ltd. Page 20 of 24... -
Page 22: Optional Package Specification
The default package method is . If you need the modules to be shipped by tape & reel, pls contact us in advance. Figure 16. Default Package by Tray Shenzhen RF-star Technology Co., Ltd. Page 21 of 24... -
Page 23: Figure 17. Package By Tape & Reel
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jun., 2021 Figure 17. Package by Tape & Reel Shenzhen RF-star Technology Co., Ltd. Page 22 of 24... -
Page 24: Revision History
1. The document will be optimized and updated from time to time. Before using this document, please make sure it is the latest version. 2. To obtain the latest document, please download it from the official website: www.rfstariot.com and www.szrfstar.com. Shenzhen RF-star Technology Co., Ltd. Page 23 of 24... -
Page 25: Contact Us
RF-WM-20CMB1 www.szrfstar.com V1.0 - Jun., 2021 7 Contact Us SHENZHEN RF-STAR TECHNOLOGY CO., LTD. Shenzhen HQ: Add.: C601, Skyworth Building, High-tech Park, Nanshan District, Shenzhen, Guangdong, China, 518057 Tel.: 86-755-3695 3756 Chengdu Branch: Add.: N2-1604, Global Center, North No. 1700, Tianfu Avenue, Hi-Tech District, Chengdu, Sichuan, China, 610095 Tel.: 86-28-6577 5970...
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