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Quectel SC20-WL Hardware Design

Quectel SC20-WL Hardware Design

Smart wi-fi module
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SC20-WL
Hardware Design
Smart Wi-Fi Module Series
Rev: SC20-WL_Hardware_Design_V1.0
Date: 2019-12-16
www.quectel.com

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  • Page 1 SC20-WL Hardware Design Smart Wi-Fi Module Series Rev: SC20-WL_Hardware_Design_V1.0 Date: 2019-12-16 www.quectel.com...
  • Page 2 QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION PROVIDED IS BASED UPON CUSTOMERS’ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION.

  • Page 3: About The Document

    Smart Wi-Fi Module Series SC20-WL Hardware Design About the Document History Revision Date Author Description 2019-12-16 Quinn.lv Initial SC20-WL_Hardware_Design 2 / 81...

  • Page 4: Table Of Contents

    Smart Wi-Fi Module Series SC20-WL Hardware Design Contents About the Document ........................... 2 Contents ............................... 3 Table Index ..............................5 Figure Index ..............................6 Introduction ............................11 1.1. Safety Information........................11 Product Concept ..........................13 2.1. General Description ......................... 13 2.2.
  • Page 5 Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21. Audio Interfaces ........................57 3.21.1. Reference Circuit Design for Microphone ..............58 3.21.2. Reference Circuit Design for Receiver Interface ............58 3.21.3. Reference Circuit Design for Headphone Interface ............59 3.21.4. Reference Circuit Design for Loudspeaker Interface............. 59 3.21.5.
  • Page 6 TABLE 28: Wi-Fi/BT FREQUENCY ........................65 TABLE 29: ANTENNA REQUIREMENTS ......................68 TABLE 30: ABSOLUTE MAXIMUM RATINGS ....................70 TABLE 31: SC20-WL MODULE POWER SUPPLY RATINGS ................70 TABLE 32: CHARGING PERFORMANCE SPECIFICATIONS ................. 71 TABLE 33: OPERATION TEMPERATURE ......................71 TABLE 34: SC20-WL CURRENT CONSUMPTION ..................
  • Page 7 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure Index FIGURE 1: FUNCTIONAL DIAGRAM ....................... 17 FIGURE 2: PIN ASSIGNMENT (TOP VIEW)..................... 19 FIGURE 3: VOLTAGE DROP SAMPLE ......................30 FIGURE 4: POWER SUPPLY ........................... 30 FIGURE 5: REFERENCE CIRCUIT OF POWER SUPPLY ................31 FIGURE 6: TURN ON THE MODULE USING DRIVING CIRCUIT ..............
  • Page 8 Smart Wi-Fi Module Series SC20-WL Hardware Design FIGURE 40: TOP VIEWS OF THE MODULE ....................77 FIGURE 41: BOTTOM VIEW OF THE MODULE ....................77 FIGURE 42: REFLOW SOLDERING THERMAL PROFILE ................79 FIGURE 43: TAPE DIMENSIONS ........................80 FIGURE 44: REEL DIMENSIONS ........................81...
  • Page 9 Smart Wi-Fi Module Series SC20-WL Hardware Design OEM/Integrators Installation Manual Important Notice to OEM integrators 1. This module is limited to OEM installation ONLY. 2. This module is limited to installation in mobile or fixed applications, according to Part 2.1091(b).
  • Page 10 Smart Wi-Fi Module Series SC20-WL Hardware Design installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures: - Reorient or relocate the receiving antenna.
  • Page 11 Smart Wi-Fi Module Series SC20-WL Hardware Design bande 5725-5825 MHz doit être conforme à la norme e.i.r.p. les limites spécifiées pour un fonctionnement point à point et non point à point, selon le cas CAN ICES-3(B)/ NMB-3(B) Radiation Exposure Statement This equipment complies with FCC/IC radiation exposure limits set forth for an uncontrolled environment.

  • Page 12: Introduction

    This document can help customers quickly understand module interface specifications, electrical and mechanical details as well as other related information of SC20-WL module. Associated with application notes and user guides, customers can use SC20-WL module to design and set up mobile applications easily.
  • Page 13 Smart Wi-Fi Module Series SC20-WL Hardware Design unpaid bills or with an invalid (U)SIM card). When emergent help is needed in such conditions, please remember using emergency call. In order to make or receive a call, the cellular terminal or mobile must be switched on in a service area with adequate cellular signal strength.

  • Page 14: Product Concept

    SC20-WL Hardware Design Product Concept 2.1. General Description SC20-WL is a series of Smart Wi-Fi module based on Qualcomm platform and Linux operating system, and provides industrial grade performance. Its general features are listed below:  Support short-range wireless communication via Wi-Fi 802.11a/b/g/n and BT4.2 LE.

  • Page 15: Key Features

    Support 802.11a/b/g/n standards, with max data rate up to 150Mbps Support AP mode Bluetooth Feature BT4.2 LE 3GPP TS 27.007 and 3GPP TS 27.005 AT commands as well as Quectel AT Commands enhanced AT commands 4-lane MIPI_DSI, up to 1.5Gbps for each lane...
  • Page 16 Smart Wi-Fi Module Series SC20-WL Hardware Design VP8 –1080P @30 fps (HEVC) H.265 MP 8 bit –1080P @30fps Audio input: 2 groups of analog microphone input, integrating internal bias voltage Audio output: Audio Interfaces Class AB stereo headphone output Class AB earpiece differential output...

  • Page 17: Functional Diagram

    When the temperature returns to the normal operation temperature levels, the module will meet IEEE specifications again. 2.3. Functional Diagram The following figure shows a block diagram of SC20-WL and illustrates the major functional parts.  Power management ...

  • Page 18: Evaluation Board

    Figure 1: Functional Diagram 2.4. Evaluation Board In order to help customers to develop applications with SC20-WL, Quectel supplies the evaluation board (Smart-EVB), RS-232 to USB cable, USB data cable, earphone, antenna and other peripherals to control or test the module. For more details, please refer to document [1].

  • Page 19: Application Interfaces

    SC20-WL Hardware Design Application Interfaces 3.1. General Description SC20-WL is equipped with 146-pin 1.0mm pitch SMT pads plus 64-pin ground/reserved pads that can be embedded into wireless application platforms. The following chapters provide the detailed description of pins/interfaces listed below.

  • Page 20: Pin Assignment

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.2. Pin Assignment The following figure shows the pin assignment of SC20-WL module. VBAT_BB GPIO_96 VBAT_BB GPIO_65 GPIO_36 GPIO_94 MIC1P GPIO_98 MIC_GND GPIO_0 MIC2P GPIO_110 GPIO_97 EARP EARN GPIO_68 SPKP GPIO_69 SPKN GPIO_89...

  • Page 21: Pin Description

    Bidirectional Digital input Digital output Power input Power output Analog input Analog output Open drain The following tables show the SC20-WL’s pin definition and electrical characteristics. Table 4: Pin Description Power Supply Pin Name Pin No. Description Comment Characteristics It must be able to...
  • Page 22 Smart Wi-Fi Module Series SC20-WL Hardware Design pull up circuits and level conversion circuit. Power supply for peripherals. 2.2uF~4.7uF capacitor is 1.8V output power Vnorm=1.8V LDO6_1V8 recommended to supply max=100mA be applied to the LDO6_1V8 pin. If unused, keep this pin open.
  • Page 23 Smart Wi-Fi Module Series SC20-WL Hardware Design Audio Interfaces Pin Name Pin No. Description Comment Characteristics Microphone positive MIC1P input for channel 1 MIC reference MIC_GND ground Microphone positive MIC2P input for channel 2 Earpiece positive EARP output Earpiece negative...
  • Page 24 Smart Wi-Fi Module Series SC20-WL Hardware Design 1.8V power UART1_ max=0.45V domain. UART1 transmit data min=1.35V If unused, keep this pin open. 1.8V power UART1_ max=0.63V domain. UART1 receive data min=1.17V If unused, keep this pin open. 1.8V power UART1_ max=0.63V...
  • Page 25 Smart Wi-Fi Module Series SC20-WL Hardware Design max=0.37V min=2.2V 1.8V SD card: SD_DATA0 max=0.58V min=1.27V SD_DATA1 max=0.45V High speed SD_DATA2 min=1.4V bidirectional digital signal lines of SD 2.95V SD card: card max=0.73V SD_DATA3 min=1.84V max=0.37V min=2.2V SD card insertion max=0.63V...
  • Page 26 Smart Wi-Fi Module Series SC20-WL Hardware Design MIPI_DSI_ MIPI DSI data signal LN0N (negative) MIPI_DSI_ MIPI DSI data signal LN0P (positive) MIPI_DSI_ MIPI DSI data signal LN1N (negative) MIPI_DSI_ MIPI DSI data signal LN1P (positive) MIPI_DSI_ MIPI DSI data signal...
  • Page 27 Smart Wi-Fi Module Series SC20-WL Hardware Design MCLK camera min=1.35V CAM1_ Clock signal of front max=0.45V MCLK camera min=1.35V Reset signal of rear max=0.45V CAM0_RST camera min=1.35V CAM0_ Power down signal max=0.45V of rear camera min=1.35V Reset signal of front max=0.45V...
  • Page 28 Smart Wi-Fi Module Series SC20-WL Hardware Design VBAT_ Battery temperature THERM detection Antenna Interface Pin Name Pin No. Description Comment Characteristics ANT_ Wi-Fi/BT antenna 50Ω impedance Wi-Fi/BT GPIO Interfaces Pin Name Pin No. Description Comment Characteristics GPIO_23 GPIO 1.8V power domain...
  • Page 29 Smart Wi-Fi Module Series SC20-WL Hardware Design GPIO_95 GPIO 1.8V power domain Multiplexed into GPIO_11 GPIO SPI_CLK. Multiplexed into GPIO_10 GPIO SPI_CS_N. Multiplexed into GPIO_9 GPIO SPI_MISO. Multiplexed into GPIO_8 GPIO SPI_MOSI GPIO_16 GPIO 1.8V power domain GPIO_17 GPIO 1.8V power domain...

  • Page 30: Power Supply

    3.4. Power Supply 3.4.1. Power Supply Pins SC20-WL provides two VBAT pins dedicated to connection with the external power supply. The two VBAT_BB pins are used for module’s baseband part. The power supply range of the module is 3.5V~4.2V, and the recommended value is 3.8V. VBAT performance, such as load capacity, ripple and spikes will directly affect the performance and stability of the module.

  • Page 31: Reference Design For Power Supply

    The power design for the module is very important, as the performance of module largely depends on the power source. The power supply of SC20-WL should be able to provide sufficient current up to 3A at least. If the voltage drop between the input and output is not too high, it is suggested to use an LDO to supply power for the module.

  • Page 32: Turn On And Off Scenarios

    Smart Wi-Fi Module Series SC20-WL Hardware Design The following figure shows a reference design for +5V input power source which adopts an LDO (MIC29302WU) from MICREL. The typical output voltage is 3.8V and the maximum rated current is 3.0A. MIC29302WU...
  • Page 33 Smart Wi-Fi Module Series SC20-WL Hardware Design PWRKEY ≥1.6s 4.7K Turn on pulse Figure 6: Turn on the Module Using Driving Circuit The other way to control the PWRKEY is using a button directly. A TVS component is indispensable to be placed nearby the button for ESD protection.

  • Page 34: Turn Off Module

    Smart Wi-Fi Module Series SC20-WL Hardware Design The turn on scenario is illustrated in the following figure. VBAT (Typ.: 3.8V) PWRKEY ≥1.6s 173ms LDO5_1V8 173.5ms LDO6_1V8 438ms LDO17_2V85 Others Active Figure 8: Timing of Turning on Module NOTES 1. When the module is powered on for the first time, its timing of turning on will be 45ms longer than that shown above.

  • Page 35: Vrtc Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design VBAT >8s PWRKEY Others Power down Figure 9: Timing of Turning off Module 3.6. VRTC Interface The RTC (Real Time Clock) can be powered by an external power source through VRTC when the module is powered down and there is no power supply for the VBAT.

  • Page 36: Power Output

    ESR. The capacitor is able to power the real-time clock for 45 seconds. 3.7. Power Output SC20-WL supports output of regulated voltages for peripheral circuits. During application, it is recommended to use parallel capacitors (33pF and 10pF) in the circuit to suppress high frequency noise.
  • Page 37 CV mode and the charging current will decrease gradually. When the battery level reaches 100%, the charging is completed. SC20-WL module supports battery temperature detection in the condition that the battery integrates a thermistor (47K 1% NTC thermistor with B-constant of 4050K by default; SDNT1608X473F4050FTF of SUNLORD is recommended) and the thermistor is connected to VBAT_THERM pin.

  • Page 38: Usb Interface

    PMU. The input voltage of power supply ranges from 4.35 to 6.3V, and the typical value is 5.0V. SC20-WL module supports charging management for a single Li-ion battery, but varied charging parameters should be set for batteries with varied models or capacities.
  • Page 39 Figure 14: USB Interface Reference Design (OTG is Supported) SC20-WL supports OTG protocol. If OTG function is needed, please refer to the above figure for the reference design. AW3605DNR is a high efficiency DC-DC chip manufactured by AWINIC, and users can choose according to their own demands.

  • Page 40: Uart Interfaces

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.10. UART Interfaces The module provides two UART interfaces:  UART1: 4-wire UART interface which supports hardware flow control  UART2: 2-wire UART interfaces and is used for debugging Table 8: Pin Description of UART Interfaces...

  • Page 41: Sd Card Interface

    UART2 is similar to UART1. Please refer to UART1 reference circuit designs for UART2’s. 3.11. SD Card Interface SC20-WL module supports SD cards with 4-bit data interfaces or SDIO devices. The pin definition of the SD card interface is shown below.
  • Page 42 Smart Wi-Fi Module Series SC20-WL Hardware Design SD_CMD Command signal of SD card SD_DATA0 High speed bidirectional SD_DATA1 digital signal lines of SD SD_DATA2 card SD_DATA3 SD_DET SD card insertion detection Active low A reference circuit for SD card interface is shown as below.

  • Page 43: Gpio Interfaces

    SD_DATA1 14.56 SD_DATA2 14.53 SD_DATA3 14.57 3.12. GPIO Interfaces SC20-WL has abundant GPIO interfaces with power domain of 1.8V. The pin definition is listed below. Table 11: Pin Definition of GPIO Interfaces Pin Name GPIO Default State Comment TP_INT GPIO_13...
  • Page 44 Smart Wi-Fi Module Series SC20-WL Hardware Design TP_I2C_SCL GPIO_19 B-PD: nppukp TP_I2C_SDA GPIO_18 B-PD: nppukp LCD_RST GPIO_25 B-PD: nppukp Wakeup LCD_TE GPIO_24 B-PD: nppukp CAM0_CLK GPIO_26 B-PD: nppukp CAM1_CLK GPIO_27 B-PD: nppukp CAM0_RST GPIO_35 B-PD: nppukp Wakeup CAM0_PWD GPIO_34 B-PD: nppukp...

  • Page 45: Spi Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design GPIO_97 GPIO_97 B-PD: nppukp Wakeup GPIO_110 GPIO_110 B-PD: nppukp Wakeup GPIO_0 GPIO_0 B-PD: nppukp GPIO_98 GPIO_98 B-PD: nppukp Wakeup GPIO_94 GPIO_94 B-PD: nppukp Wakeup GPIO_36 GPIO_36 B-PD: nppukp Wakeup GPIO_65 GPIO_65 B-PD: nppukp...

  • Page 46: I2C Interfaces

    Can be multiplexed into SPI_CLK. 3.14. I2C Interfaces SC20-WL provides 3 groups of I2C interfaces which only support the master mode. As an open drain output, the I2C interfaces need a pull-up resistor on its external circuit, and the recommended logic level is 1.8V.

  • Page 47: Adc Interfaces

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.15. ADC Interfaces SC20-WL provides three analog-to-signal converter (ADC) interfaces, and the pin definition is shown below. Table 14: Pin Definition of ADC Interfaces Pin Name Pin No Description Comment General purpose ADC Max input voltage is 1.7V...

  • Page 48: Lcm Interface

    3.17. LCM Interface SC20-WL module provides an LCM interface meeting MIPI DSI specification. The interface supports high speed differential data transmission, with up to four lanes and a transmission rate up to 1.5Gbps per lane. It supports maximally 720P resolution displays.
  • Page 49 Smart Wi-Fi Module Series SC20-WL Hardware Design MIPI DSI clock signal MIPI_DSI_CLKN (negative) MIPI DSI clock signal MIPI_DSI_CLKP (positive) MIPI DSI data signal MIPI_DSI_LN0N (negative) MIPI DSI data signal MIPI_DSI_LN0P (positive) MIPI DSI data signal MIPI_DSI_LN1N (negative) MIPI DSI data signal...
  • Page 50 ADC pin. Backlight driving circuit needs to be designed for LCM, and a reference circuit design is shown in the following figure. Backlight brightness adjustment can be realized by PWM pin of SC20-WL module through adjusting the duty ratio. SC20-WL_Hardware_Design...

  • Page 51: Touch Panel Interface

    Figure 20: Reference Design for Backlight Dirving Circuit 3.18. Touch Panel Interface SC20-WL provides a set of I2C interface for connection with Touch Panel (TP), and also provides the corresponding power supply and interrupt pins. The definition of TP interface pins is illustrated below.

  • Page 52: Camera Interfaces

    Figure 21: Reference Circuit Design for TP Interface 3.19. Camera Interfaces Based on standard MIPI CSI video input interface, SC20-WL module supports two cameras, and the maximum pixel of the rear camera can be up to 8MP. The video and photo quality is determined by various factors such as the camera sensor, camera lens quality, etc.
  • Page 53 Smart Wi-Fi Module Series SC20-WL Hardware Design Table 18: Pin Definition of Rear Camera Interface Pin Name Pin No Description Comment 1.8V normal voltage. 1.8V output power supply for LDO6_1V8 Vnorm=1.8V DOVDD of camera max=100mA 2.85V output power supply for 2.85V normal voltage.

  • Page 54: Front Camera Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design DVDD_1V2 DVDD_1V2 VDD_AF_2V8 AF_VDD2V8 LDO6_1V8 DGND 1uF 1uF 100nF 2.2K 2.2K MDP2 MIPI_CSI0_LN1P MDN2 MIPI_CSI0_LN1N EMI Filter SIOD CAM_I2C_SDA SIOC CAM_I2C_SCL RESET CAM0_RST LDO17_2V85 AVDD_2V8 DOVDD1V8 LDO6_1V8 MIPI_CSI0_CLKP DGND MIPI_CSI0_CLKN MIPI_CSI0_LN0P MDP1 MDN1...
  • Page 55 Smart Wi-Fi Module Series SC20-WL Hardware Design max=100mA 2.85V normal voltage. 2.85V output power supply LDO17_2V85 Vnorm=2.85V for AVDD of camera max=300mA MIPI CSI clock signal MIPI_CSI1_CLKN (negative) MIPI CSI clock signal MIPI_CSI1_CLKP (positive) MIPI CSI data signal MIPI_CSI1_LN0N (negative)

  • Page 56: Design Considerations

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.19.3. Design Considerations  Special attention should be paid to the definition of video device interface in schematic design. Different video devices will have varied definitions for their corresponding connectors. Assure the device and the connectors are correctly connected.

  • Page 57: Sensor Interfaces

    MIPI_CSI1_LN0P 19.24 3.20. Sensor Interfaces SC20-WL module supports communication with sensors via I2C interface, and it supports ALS/PS, compass, G-sensor, and gyroscopic sensors. Verified sensor models by Quectel include: BST-BMA223, STK3311-WV, MPU-6881 and MMC35240PJ. Table 21: Pin Definition of Sensor Interfaces...

  • Page 58: Audio Interfaces

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21. Audio Interfaces SC20-WL module provides two analog input channels and three analog output channels. The following table shows the pin definition. Table 22: Pin Definition of Audio Interfaces Pin Name Pin No...

  • Page 59: Reference Circuit Design For Microphone

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21.1. Reference Circuit Design for Microphone MIC1P MIC_GND Module 100pF Figure 24: Reference Circuit Design for Microphone Interface 3.21.2. Reference Circuit Design for Receiver Interface EARP EARN Module Figure 25: Reference Circuit Design for Receiver Interface...

  • Page 60: Reference Circuit Design For Headphone Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.21.3. Reference Circuit Design for Headphone Interface MIC_GND MIC2P HPH_L HS_DET HPH_R HPH_GND D1 D2 D3 D4 Module Figure 26: Reference Circuit Design for Headphone Interface 3.21.4. Reference Circuit Design for Loudspeaker Interface...

  • Page 61: Emergency Download Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design 3.22. Emergency Download Interface USB_BOOT is an emergency download interface. Pull up to LDO5_1V8 during power-up will force the module enter into emergency download mode. This is an emergency option when there are failures such as abnormal startup or running.

  • Page 62: Wi-Fi And Bt

    SC20-WL Hardware Design Wi-Fi and BT SC20-WL module provides a shared antenna interface ANT_WIFI/BT for Wi-Fi and Bluetooth (BT) functions. The interface impedance is 50Ω. External antennas such as PCB antenna and ceramic antenna can be connected to the module via the interface, so as to achieve Wi-Fi and BT functions.
  • Page 63 Smart Wi-Fi Module Series SC20-WL Hardware Design 802.11n HT20 MCS7 13dBm± 2.5dBm 802.11n HT40 MCS0 14dBm± 2.5dBm 802.11n HT40 MCS7 13dBm± 2.5dBm 802.11a 6Mbps 15dBm± 2.5dBm 802.11a 54Mbps 13dBm± 2.5dBm 802.11n HT20 MCS0 14dBm± 2.5dBm 5GHz 802.11n HT20 MCS7 12dBm± 2.5dBm 802.11n HT40...

  • Page 64: Bt Overview

    IEEE Std 802.11b, IEEE Std 802.11d, IEEE Std 802.11e, IEEE Std 802.11g, IEEE Std 802.11i: IEEE 802.11-2007 WLAN MAC and PHY, June 2007 4.2. BT Overview SC20-WL module supports BT4.2 (BR/EDR+BLE) specification, as well as GFSK, 8-DPSK, π/4-DQPSK modulation modes. ...

  • Page 65: Bt Performance

    Smart Wi-Fi Module Series SC20-WL Hardware Design 4.2.1. BT Performance The following table lists the BT transmitting and receiving performance of SC20-WL module. Table 26: BT Transmitting and Receiving Performance Transmitter Performance Packet Types 2-DH5 3-DH5 Transmitting Power 10dBm± 2.5dBm 8dBm±...

  • Page 66: Antenna Interface

    Smart Wi-Fi Module Series SC20-WL Hardware Design Antenna Interface SC20-WL antenna interface includes a Wi-Fi/BT antenna. The antenna interface has an impedance of 50Ω. 5.1. Wi-Fi/BT Antenna Interface The following tables show the Wi-Fi/BT antenna pin’s definition and frequency specification.

  • Page 67: Reference Design Of Rf Layout

    Smart Wi-Fi Module Series SC20-WL Hardware Design NOTE π-type Place the matching components (R1, C1, C2) as close to the antenna as possible. 5.1.1. Reference Design of RF Layout For user’s PCB, the characteristic impedance of all RF traces should be controlled to 50Ω. The impedance of the RF traces is usually determined by the trace width (W), the materials’...
  • Page 68 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 32: Coplanar Waveguide Design on a 4-layer PCB (Layer 3 as Reference Ground) Figure 33: Coplanar Waveguide Design on a 4-layer PCB (Layer 4 as Reference Ground) In order to ensure RF performance and reliability, the following principles should be complied with in RF layout design: ...

  • Page 69: Antenna Installation

    Smart Wi-Fi Module Series SC20-WL Hardware Design 5.2. Antenna Installation 5.2.1. Antenna Requirements The following table shows the requirements on Wi-Fi/BT antenna. Table 29: Antenna Requirements Type Requirements VSWR: ≤ 2 Gain (dBi): 1 Max Input Power (W): 50 Wi-Fi/BT Input Impedance (Ω): 50...
  • Page 70 Smart Wi-Fi Module Series SC20-WL Hardware Design U.FL-LP serial connector listed in the following figure can be used to match the U.FL-R-SMT. Figure 35: Mechanical Parameters of U.FL-LP Connectors The following figure describes the space factor of mated connectors. Figure 36: Space Factor of Mated Connectors (Unit: mm) For more details, please visit http://www.hirose.com.

  • Page 71: Electrical, Reliability And Radio Characteristics

    Parameter Min. Max. Unit VBAT -0.5 USB_VBUS -0.5 Voltage on Digital Pins -0.3 6.2. Power Supply Ratings Table 31: SC20-WL Module Power Supply Ratings Parameter Description Conditions Min. Typ. Max. Unit The actual input voltages must VBAT VBAT stay between the minimum and maximum values.

  • Page 72: Charging Performance Specifications

    Smart Wi-Fi Module Series SC20-WL Hardware Design 6.3. Charging Performance Specifications Table 32: Charging Performance Specifications Parameter Min. Typ. Max. Unit Trickle charging-A current Trickle charging-A threshold voltage range (15.62mV stepping up) 2.796 2.984 Trickle charging-B threshold voltage range (18.75mV stepping up) 3.581...

  • Page 73: Current Consumption

    Smart Wi-Fi Module Series SC20-WL Hardware Design 6.5. Current Consumption Table 34: SC20-WL Current Consumption Parameter Description Conditions Min. Typ. Max. Unit OFF state Power down Sleep state RF sleep Idle state RF idle 42.7 @1Mbps Wi-Fi 11b TX @11Mbps...

  • Page 74: Electrostatic Discharge

    The following table shows the electrostatic discharge characteristics of SC20-WL module. Table 35: ESD Characteristics (Temperature: 25° C, Humidity: 45%)

  • Page 75: Mechanical Dimensions

    Smart Wi-Fi Module Series SC20-WL Hardware Design Mechanical Dimensions This chapter describes the mechanical dimensions of the module. All dimensions are measured in millimeter (mm), and the tolerances for dimensions without tolerance values are ± 0.05mm. 7.1. Mechanical Dimensions of the Module...
  • Page 76 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 38: Module Bottom Dimensions (Top View) SC20-WL_Hardware_Design 75 / 81...

  • Page 77: Recommended Footprint

    Smart Wi-Fi Module Series SC20-WL Hardware Design 7.2. Recommended Footprint Figure 39: Recommended Footprint (Top View) NOTES For easy maintenance of the module, keep about 3mm between the module and other components on host PCB. All RESERVED pins should be kept open and MUST NOT be connected to ground.

  • Page 78: Top And Bottom Views Of The Module

    Figure 40: Top View of the Module Figure 41: Bottom View of the Module NOTE These are renderings of SC20-W module. For authentic dimension and appearance, please refer to the module that you received from Quectel. SC20-WL_Hardware_Design 77 / 81...

  • Page 79: Storage, Manufacturing And Packaging

    Storage, Manufacturing and Packaging 8.1. Storage SC20-WL is stored in a vacuum-sealed bag. It is rated at MSL 3, and its storage restrictions are shown as below. 1. Shelf life in the vacuum-sealed bag: 12 months at <40º C/90%RH. 2. After the vacuum-sealed bag is opened, devices that will be subjected to reflow soldering or other high temperature processes must be: ...

  • Page 80: Manufacturing And Soldering

    Smart Wi-Fi Module Series SC20-WL Hardware Design 8.2. Manufacturing and Soldering Push the squeegee blade to apply the solder paste on the surface of stencil, making the paste fill the stencil apertures and then letting it penetrate to the PCB. Downward squeegee pressure should be adjusted properly to ensure that the stencil is wiped clean without damaging the stencil.

  • Page 81: Packaging

    1 to 4° C/sec Reflow Cycle Max reflow cycle 8.3. Packaging SC20-WL is packaged in tape and reel carriers. Each reel is 12.32m long and contains 200 modules. The following figures show the package details, measured in mm. Figure 43: Tape Dimensions SC20-WL_Hardware_Design...
  • Page 82 Smart Wi-Fi Module Series SC20-WL Hardware Design Figure 44: Reel Dimensions Table 37: Reel Packaging Model Name MOQ for MP Minimum Package: 200pcs Minimum Package×4=800pcs Size: 370mm × 350mm × 85mm Size: 380mm × 365mm × 365mm SC20-WL N.W: 1.92kg N.W: 7.68kg...

  • Page 83: Appendix A References

    Smart Wi-Fi Module Series SC20-WL Hardware Design Appendix A References Table 38: Related Documents Document Name Remark Quectel_Smart_EVB_User_Guide Smart EVB User Guide Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide Quectel_RF_Layout_Application_Note RF Layout Application Note Table 39: Terms and Abbreviations Abbreviation Description...
  • Page 84 Smart Wi-Fi Module Series SC20-WL Hardware Design Input/Output Liquid Crystal Display Liquid Crystal Module LPDDR Low Power Double Data Rate MIPI Mobile Industry Processor Interface Moisture Sensitivity Level Negative Temperature Coefficient On-The-Go Personal Computer Printed Circuit Board Personal Data Assistant...
  • Page 85 Smart Wi-Fi Module Series SC20-WL Hardware Design UART Universal Asynchronous Receiver & Transmitter Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value Maximum Input High Level Voltage Value Minimum Input High Level Voltage Value Maximum Input Low Level Voltage Value...
  • Page 86 Smart Wi-Fi Module Series SC20-WL Hardware Design SC20-WL_Hardware_Design 85 / 81...
  • Page 87 Smart Wi-Fi Module Series SC20-WL Hardware Design SC20-WL_Hardware_Design 86 / 81...

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