Quectel SC20-WL Hardware Design Download Page 36

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Smart Wi-Fi Module Series

SC20-WL Hardware Design

SC20-WL_Hardware_Design

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If RTC is ineffective, it can be synchronized through network after the module is powered on.



2.0V~3.25V input voltage range and 3.0V typical value for VRTC. When VBAT is disconnected, the

average consumption is typically 5uA.



When powered by VBAT, the RTC error is 50ppm. When powered by VRTC, the RTC error is

200ppm.



If the rechargeable battery is used, the ESR of the battery should be less than 2K, and it is

recommended to use the MS621FE FL11E of SEIKO.



If a large capacitance capacitor is selected, it is recommended to use a 100uF capacitor with low

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.

Table 5: Power Description

3.8. Battery Charge and Management

SC20-WL module can recharge over-discharged batteries. The battery charger in SC20-WL module

supports trickle charging, constant current charging and constant voltage charging modes, which

optimizes the charging procedure for Li-ion batteries.



Trickle charging:

There are two steps in this mode. When the battery voltage is below 2.8V, a 90mA

trickle charging current is applied to the battery. When the battery voltage is charged up and is

between 2.8V and 3.2V, the charging current can be set to 450mA maximally.



Constant current mode (CC mode):

When the battery is increased to between 3.2V and 4.2V, the

Pin Name

Default Voltage (V)

Driving Current (mA)

Idle

LDO5_1V8

1.8

KEEP

LDO6_1V8

1.8

100

LDO17_2V85

2.85

300

SD_LDO12

2.95

SD_LDO11

2.95

600

Summary of Contents for SC20-WL

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: ...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 ALL INFORMATION SUPPLIED HEREIN IS ...

Page 3: ...Smart Wi Fi Module Series SC20 WL Hardware Design SC20 WL_Hardware_Design 2 81 About the Document History Revision Date Author Description 1 0 2019 12 16 Quinn lv Initial ...

Page 4: ...ins 29 3 4 2 Decrease Voltage Drop 29 3 4 3 Reference Design for Power Supply 30 3 5 Turn on and off Scenarios 31 3 5 1 Turn on Module Using the PWRKEY 31 3 5 2 Turn off Module 33 3 6 VRTC Interface 34 3 7 Power Output 35 3 8 Battery Charge and Management 35 3 9 USB Interface 37 3 10 UART Interfaces 39 3 11 SD Card Interface 40 3 12 GPIO Interfaces 42 3 13 SPI Interface 44 3 14 I2C Interfaces 45 3...

Page 5: ...a Interface 65 5 1 Wi Fi BT Antenna Interface 65 5 1 1 Reference Design of RF Layout 66 5 2 Antenna Installation 68 5 2 1 Antenna Requirements 68 5 2 2 Recommended RF Connector for Antenna Installation 68 6 Electrical Reliability and Radio Characteristics 70 6 1 Absolute Maximum Ratings 70 6 2 Power Supply Ratings 70 6 3 Charging Performance Specifications 71 6 4 Operation and StorageTemperatures ...

Page 6: ...TION OF TOUCH PANEL INTERFACE 50 TABLE 18 PIN DEFINITION OF REAR CAMERA INTERFACE 52 TABLE 19 PIN DEFINITION OF FRONT CAMERA INTERFACE 53 TABLE 20 MIPI TRACE LENGTH INSIDE THE MODULE 55 TABLE 21 PIN DEFINITION OF SENSOR INTERFACES 56 TABLE 22 PIN DEFINITION OF AUDIO INTERFACES 57 TABLE 23 Wi Fi TRANSMITTING PERFORMANCE 61 TABLE 24 Wi Fi RECEIVING PERFORMANCE 62 TABLE 25 BT DATA RATE AND VERSION 63...

Page 7: ... DESIGN FOR BACKLIGHT DIRVING CIRCUIT 50 FIGURE 21 REFERENCE CIRCUIT DESIGN FOR TP INTERFACE 51 FIGURE 22 REFERENCE CIRCUIT DESIGN FOR REAR CAMERA INTERFACE 53 FIGURE 23 REFERENCE CIRCUIT DESIGN FOR FRONT CAMERA INTERFACE 54 FIGURE 24 REFERENCE CIRCUIT DESIGN FOR MICROPHONE INTERFACE 58 FIGURE 25 REFERENCE CIRCUIT DESIGN FOR RECEIVER INTERFACE 58 FIGURE 26 REFERENCE CIRCUIT DESIGN FOR HEADPHONE IN...

Page 8: ...20 WL Hardware Design SC20 WL_Hardware_Design 7 81 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: ...ontains the following text Contains FCC ID XMR201911SC20WL Contains IC 10224A 2019SC20WL The FCC ID IC ID can be used only when all FCC IC compliance requirements are met In the event that these conditions cannot be met for example certain laptop configurations or co location with another transmitter then the FCC IC authorization is no longer considered valid and the FCC ID IC ID cannot be used on...

Page 10: ...it accepter tout brouillage radioé lectrique subi même si le brouillage est susceptible d en compromettre le fonctionnement The device could automatically discontinue transmission in case of absence of information to transmit or operational failure Note that this is not intended to prohibit transmission of control or signaling information or the use of repetitive codes where required by the techno...

Page 11: ...ites spécifiées pour un fonctionnement point àpoint et non point àpoint 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 This equipment should be installed and operated with minimum distance 20 cm between the radiator your body ...

Page 12: ...ot so Quectel assumes no liability for customers failure to comply with these precautions Full attention must be given to driving at all times in order to reduce the risk of an accident Using a mobile while driving even with a handsfree kit causes distraction and can lead to an accident Please comply with laws and regulations restricting the use of wireless devices while driving Switch off the cel...

Page 13: ...bile contains a transmitter and receiver When it is ON it receives and transmits radio frequency signals RF interference can occur if it is used close to TV set radio computer or other electric equipment In locations with potentially explosive atmospheres obey all posted signs to turn off wireless devices such as your phone or other cellular terminals Areas with potentially explosive atmospheres i...

Page 14: ...ide multiple audio and video input output interfaces as well as abundant GPIO interfaces The following table shows the supported Wi Fi BT standards and frequency range of SC20 WL series module Table 1 SC20 WL Frequency Bands SC20 WL is an SMD type module which can be embedded into applications through its 210 pin pads including 146 LCC signal pads and 64 other pads With a compact profile of 40 5mm...

Page 15: ...le frequency bands Support 802 11a b g n standards with max data rate up to 150Mbps Support AP mode Bluetooth Feature BT4 2 LE AT Commands 3GPP TS 27 007 and 3GPP TS 27 005 AT commands as well as Quectel enhanced AT commands LCM Interface 4 lane MIPI_DSI up to 1 5Gbps for each lane Support WVGA 2 lane MIPI_DSI up to 720p 4 lane MIPI_DSI 24 bit color depth Camera Interfaces Use MIPI_CSI up to 1 5Gb...

Page 16: ...ws 7 8 8 1 Linux 2 6 or later UART Interfaces 2 UART interfaces UART1 and UART2 UART1 4 wire UART interface with RTS CTS hardware flow control baud rate up to 4Mbps UART2 2 wire UART interface used for debugging Motor Drive Interface Drive ERM motor SD Card Interface Support SD 3 0 4 bit SDIO Support hot plug I2C Interfaces 3 groups of I2C Used for peripherals such as camera sensor touch panel etc...

Page 17: ...e parameters like Pout might reduce in their value and exceed the specified tolerances 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 Radio frequency Baseband LPDDR3 EMMC flash Peripheral int...

Page 18: ...VBAT_BB LCM MIPI CAM MIPI SD Card SAW ANT_WIFI BT WCN RESET_N VRTC 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: ...ds that can be embedded into wireless application platforms The following chapters provide the detailed description of pins interfaces listed below Power supply VRTC interface USB interface UART interfaces SD card interface GPIO interfaces SPI interface I2C interfaces ADC interfaces Motor drive interface LCM interface TP interface Camera interfaces Sensor interfaces Audio interfaces Emergency down...

Page 20: ...24 126 128 127 130 129 132 131 133 135 134 137 136 139 138 140 142 141 144 143 146 145 148 147 152 151 154 167 169 168 170 165 164 166 163 180 181 188 189 158 156 157 155 160 161 159 162 184 186 185 175 177 176 178 173 172 174 171 193 192 208 209 201 202 200 206 203 GND EARP EARN GND USB_VBUS USB_VBUS GND GND HS_DET HPH_L HPH_GND HPH_R GND VBAT_THERM VBAT_SNS GND GND ADC CHARGE_SEL LDO17_2V85 VRTC...

Page 21: ...I Power input PO Power output AI Analog input AO Analog output OD Open drain Power Supply Pin Name Pin No I O Description DC Characteristics Comment VBAT_BB 1 2 PI Power supply for module s baseband part Vmax 4 2V Vmin 3 5V Vnorm 3 8V It must be able to provide sufficient current up to 3 0A It is suggested to use a zener diode for voltage stabilization VRTC 126 PI PO Power supply for internal RTC ...

Page 22: ...DO17_ 2V85 129 PO 2 85V output power supply Vnorm 2 85V IOmax 300mA Power supply for peripherals 2 2uF 4 7uF capacitor is recommended to be applied to the LDO17_2V85 pin If unused keep this pin open SD_LDO11 38 PO Power supply for SD card Vnorm 2 95V IOmax 600mA SD_LDO12 32 PO 1 8V 2 95V output power supply Vnorm 2 95V IOmax 50mA Power supply for SD card s pull up circuit GND 3 7 12 15 27 51 62 69...

Page 23: ... right channel output HPH_GND 137 Headphone virtual ground HPH_L 138 AO Headphone left channel output HS_DET 139 AI Headset insertion detection High level by default USB Interface Pin Name Pin No I O Description DC Characteristics Comment USB_VBUS 141 142 PI USB power supply Vmax 6 3V Vmin 4 35V Vnorm 5 0V Used for USB 5V power input and USB detection USB_DM 13 IO USB differential data bus minus C...

Page 24: ... 1 35V 1 8V power domain If unused keep this pin open UART2_ RXD 93 DI UART2 receive data Debug port by default VILmax 0 63V VIHmin 1 17V 1 8V power domain If unused keep this pin open UART2_ TXD 94 DO UART2 transmit data Debug port by default VOLmax 0 45V VOHmin 1 35V 1 8V power domain If unused keep this pin open SD Card Interface Pin Name Pin No I O Description DC Characteristics Comment SD_CLK...

Page 25: ..._INT 30 DI Interrupt signal of TP VILmax 0 63V VIHmin 1 17V 1 8V power domain TP_RST 31 DO Reset signal of TP VOLmax 0 45V VOHmin 1 35V 1 8V power domain Active low TP_I2C_ SCL 47 OD I2C clock signal of TP 1 8V power domain TP_I2C_ SDA 48 OD I2C data signal of TP 1 8V power domain LCM Interface Pin Name Pin No I O Description DC Characteristics Comment PWM 29 DO Adjust the backlight brightness PWM...

Page 26: ... data signal positive Camera Interfaces Pin Name Pin No I O Description DC Characteristics Comment MIPI_CSI0_ CLKN 63 AI MIPI CSI clock signal negative MIPI_CSI0_ CLKP 64 AI MIPI CSI clock signal positive MIPI_CSI0_ LN0N 65 AI MIPI CSI data signal negative MIPI_CSI0_ LN0P 66 AI MIPI CSI data signal positive MIPI_CSI0_ LN1N 67 AI MIPI CSI data signal negative MIPI_CSI0_ LN1P 68 AI MIPI CSI data sig...

Page 27: ...main Keypad Interfaces Pin Name Pin No I O Description DC Characteristics Comment PWRKEY 114 DI Turn on off the module VILmax 0 63V VIHmin 1 17V Pull up to 1 8V internally Active low KEY_VOL_ UP 95 DI Volume up VILmax 0 63V VIHmin 1 17V If unused keep this pin open KEY_VOL_ DOWN 96 DI Volume down VILmax 0 63V VIHmin 1 17V If unused keep this pin open SENSOR_I2C Interfaces Pin Name Pin No I O Descr...

Page 28: ...O GPIO 1 8V power domain GPIO_31 97 IO GPIO 1 8V power domain GPIO_92 98 IO GPIO 1 8V power domain GPIO_88 1 99 IO GPIO 1 8V power domain GPIO_89 100 IO GPIO 1 8V power domain GPIO_69 101 IO GPIO 1 8V power domain GPIO_68 1 102 IO GPIO 1 8V power domain GPIO_97 103 IO GPIO 1 8V power domain GPIO_110 104 IO GPIO 1 8V power domain GPIO_0 105 IO GPIO 1 8V power domain GPIO_98 106 IO GPIO 1 8V power d...

Page 29: ...cteristics Comment VIB_DRV 28 PO Motor drive Connected to the negative terminal of the motor RESET_N 179 DI Reset the module Disabled by default and can be enabled through software configuration USB_BOOT 46 DI Force the module to boot from USB port Set USB_BOOT to high level will force the module to enter into emergency download mode CHARGE_ SEL 127 DI Used for charger selection If it is open inte...

Page 30: ...y 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 If the voltage drops below 3 1V the module will be turned off automatically 3 4 2 Decrease Voltage Drop Make sure the input voltage will never drop below 3 1V If the voltage drops below 3 1V the module will be...

Page 31: ...power source it is suggested to use a 0 5W zener diode and place it as close to the VBAT pins as possible The following figure shows the star structure of the power supply Module VBAT_BB VBAT C1 100uF C2 100nF D1 Figure 4 Power Supply 3 4 3 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 ...

Page 32: ...for module in abnormal state and then switch on the power to restart the module 2 The module supports battery charging function by default If the above power supply design is adopted please make sure the charging function is disabled by software or connect VBAT to Schottky diode in series to avoid the reverse current to the power supply chip 3 5 Turn on and off Scenarios 3 5 1 Turn on Module Using...

Page 33: ... Q1 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 A reference circuit is shown in the following figure PWRKEY S1 Close to S1 TVS Figure 7 Turn on the Module Using Keystroke ...

Page 34: ... on will be 45ms longer than that shown above 2 Make sure that VBAT is stable before pulling down PWRKEY pin The recommended time between them is no less than 30ms PWRKEY pin cannot be pulled down all the time 3 5 2 Turn off Module Set the PWRKEY pin low for at least 1s and then choose to turn off the module when the prompt window comes up The other way to turn off the module is to drive PWRKEY to...

Page 35: ... the module is powered down and there is no power supply for the VBAT The external power source can be capacitor or rechargeable battery such as coil cells according to application demands The following are some reference circuit designs when an external battery or capacitor is utilized for powering RTC Module RTC Core VRTC Coin Cell Figure 10 RTC Powered by Coin Cell Large Capacitance Capacitor M...

Page 36: ...tages for peripheral circuits During application it is recommended to use parallel capacitors 33pF and 10pF in the circuit to suppress high frequency noise Table 5 Power Description 3 8 Battery Charge and Management SC20 WL module can recharge over discharged batteries The battery charger in SC20 WL module supports trickle charging constant current charging and constant voltage charging modes whic...

Page 37: ...ay error etc A reference design for battery charging circuit is shown as below GND VBAT_SNS VBAT_THERM VBAT 0R 100uF NTC VBAT 1uF ESD ESD 1 2 3 USB_VBUS Adapter or USB Module Battery GND C1 C2 R1 D1 D2 Figure 12 Reference Design for Battery Charging Circuit Mobile devices such as mobile phones and handheld POS systems are powered by batteries When different batteries are utilized the charging and ...

Page 38: ...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 The module is available a built in linear charging circuit which supports maximally 1 44A charging current The following are two USB interface reference designs for customers to cho...

Page 39: ...th the following principles while designing USB interface It is important to route the USB signal traces as differential pairs with total grounding The impedance of USB differential trace is 90Ω Keep the ESD protection devices as close as possible to the USB connector Pay attention to the influence of junction capacitance of ESD protection devices on USB data lines Typically the capacitance value ...

Page 40: ...D B1 B2 B3 B4 LDO5_1V8 UART1_RTS UART1_RXD UART1_CTS UART1_TXD RTS_3 3V RXD_3 3V CTS_3 3V TXD_3 3V VDD_3 3V TXS0104EPWR C1 100pF C2 U1 100pF Figure 15 Reference Circuit with Level Translator Chip for UART1 Pin Name Pin No I O Description Comment UART1_TXD 34 DO UART1 transmit data 1 8V power domain If it is unused keep it open UART1_RXD 35 DI UART1 receive data 1 8V power domain If it is unused ke...

Page 41: ...UT1B FORCEON FORCEOFF INVALID 3 3V DOUT1 DOUT2 DOUT3 DOUT4 DOUT5 RIN3 RIN2 RIN1 VCC GND OE SN65C3238 DB 9 RTS TXD CTS RXD GND Figure 16 RS232 Level Match Circuit for UART1 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...

Page 42: ...ve current it is recommended that the trace width is 0 5mm or more In order to ensure the stability of drive power a 2 2uF capacitor should be added in parallel near the SD card connector CMD CLK DATA0 DATA1 DATA2 and DATA3 are all high speed signal lines In PCB design please control the characteristic impedance of them as 50Ω and do not cross with other traces It is recommended to route the trace...

Page 43: ... Pin No Signal Length mm Comment 39 SD_CLK 14 60 40 SD_CMD 14 55 41 SD_DATA0 14 53 42 SD_DATA1 14 56 43 SD_DATA2 14 53 44 SD_DATA3 14 57 PIN Pin Name GPIO Default State Comment 30 TP_INT GPIO_13 B PD nppukp Wakeup 31 TP_RST GPIO_12 B PD nppukp Wakeup 33 GPIO_23 GPIO_23 B PD nppukp 34 UART1_TXD GPIO_20 B PD nppukp Wakeup 35 UART1_RXD GPIO_21 B PD nppukp UART1_RX Wakeup 36 UART1_CTS GPIO_111 B PD np...

Page 44: ... nppukp Wakeup 82 CAM1_PWD GPIO_33 B PD nppukp 83 CAM_I2C_SCL GPIO_30 B PD nppukp 84 CAM_I2C_SDA GPIO_29 B PD nppukp 90 GPIO_32 GPIO_32 B PD nppukp 91 SENSOR_I2C_SCL GPIO_7 B PD nppukp 92 SENSOR_I2C_SDA GPIO_6 B PD nppukp 93 UART2_RXD GPIO_5 B PD nppukp Wakeup 94 UART2_TXD GPIO_4 B PD nppukp 95 KEY_VOL_UP GPIO_90 B PD nppukp Wakeup 96 KEY_VOL_DOWN GPIO_91 B PD nppukp Wakeup 97 GPIO_31 GPIO_31 B PD...

Page 45: ..._110 GPIO_110 B PD nppukp Wakeup 105 GPIO_0 GPIO_0 B PD nppukp 106 GPIO_98 GPIO_98 B PD nppukp Wakeup 107 GPIO_94 GPIO_94 B PD nppukp Wakeup 108 GPIO_36 GPIO_36 B PD nppukp Wakeup 109 GPIO_65 GPIO_65 B PD nppukp Wakeup 110 GPIO_96 GPIO_96 B PD nppukp Wakeup 112 GPIO_58 GPIO_58 B PD nppukp Wakeup 113 GPIO_99 GPIO_99 B PD nppukp 115 GPIO_95 GPIO_95 B PD nppukp Wakeup 116 GPIO_11 GPIO_11 B PD nppukp ...

Page 46: ...tion GPIO_8 119 IO GPIO by default Can be multiplexed into SPI_MOSI Master out slave in of SPI GPIO_9 118 IO GPIO by default Can be multiplexed into SPI_MISO Master in slave out of SPI GPIO_10 117 DO GPIO by default Can be multiplexed into SPI_CS_N SPI chip select GPIO_11 116 DO GPIO by default Can be multiplexed into SPI_CLK SPI clock Pin Name Pin No I O Description Comment TP_I2C_SCL 47 OD I2C c...

Page 47: ...l purpose ADC with resistor divider input can be used 3 16 Motor Drive Interface The pin definition of motor drive interface is listed below Table 15 Pin Definition of Motor Drive Interface The motor is driven by an exclusive circuit and a reference circuit design is shown below Pin Name Pin No I O Description Comment ADC 128 AI General purpose ADC Max input voltage is 1 7V VBAT_SNS 133 AI Input v...

Page 48: ...ace 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 Table 16 Pin Definition of LCM Interface Pin Name Pin No I O Description Comment LDO6_1V8 125 PO 1 8V output power supply for LCM logic circuit and DSI 1 8V normal voltage Vnorm 1 8V IOmax 100mA LDO17_2V85 129 PO 2 85V output pow...

Page 49: ...I_DSI_CLKN 52 AO MIPI DSI clock signal negative MIPI_DSI_CLKP 53 AO MIPI DSI clock signal positive MIPI_DSI_LN0N 54 AO MIPI DSI data signal negative MIPI_DSI_LN0P 55 AO MIPI DSI data signal positive MIPI_DSI_LN1N 56 AO MIPI DSI data signal negative MIPI_DSI_LN1P 57 AO MIPI DSI data signal positive MIPI_DSI_LN2N 58 AO MIPI DSI data signal negative MIPI_DSI_LN2P 59 AO MIPI DSI data signal positive M...

Page 50: ...1 1 2 1 2 1 2 1 2 100nF 4 7uF 1uF Module LCM FL1 FL2 FL3 FL4 FL5 EMI filter C3 C2 C1 Figure 19 Reference Circuit Design for LCM Interface MIPI are high speed signal lines It is recommended that common mode filters should be added in series near the LCM connector so as to improve protection against electromagnetic radiation interference ICMEF112P900MFR from ICT is recommended When compatible design...

Page 51: ...ing power supply and interrupt pins The definition of TP interface pins is illustrated below Table 17 Pin Definition of Touch Panel Interface Pin Name Pin No I O Description Comment LDO6_1V8 125 PO 1 8V output power supply for TP I O power Pull up power supply of I2C 1 8V normal voltage LDO17_2V85 129 PO 2 85V output power supply for TP VDD power TP power supply 2 85V normal voltage TP_INT 30 DI I...

Page 52: ...ximum 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 It is recommended to select a proper camera model according to the specification of cameras verified and recommended by Quectel The following models of camera sensors have been verified by Quectel For rear camera Hi843 of SK Hynix T4KA3 of T...

Page 53: ... power supply for auto focus circuit and AVDD of camera 2 85V normal voltage Vnorm 2 85V IOmax 300mA MIPI_CSI0_CLKN 63 AI MIPI CSI clock signal negative MIPI_CSI0_CLKP 64 AI MIPI CSI clock signal positive MIPI_CSI0_LN0N 65 AI MIPI CSI data signal negative MIPI_CSI0_LN0P 66 AI MIPI CSI data signal positive MIPI_CSI0_LN1N 67 AI MIPI CSI data signal negative MIPI_CSI0_LN1P 68 AI MIPI CSI data signal ...

Page 54: ...3 4 5 6 2 2K 2 2K Module Rear Camera FL1 FL2 FL3 EMI Filter R1 R2 EMI Filter C1 C2 C3 R3 R4 Figure 22 Reference Circuit Design for Rear Camera Interface DVDD_1V2 is used to power the rear camera core and VDD_AF_2V8 is used to power the rear camera AF circuit Both of them are powered by an external LDO 3 19 2 Front Camera Interface The front camera interface integrates a differential data interface...

Page 55: ... 20 21 22 23 24 25 100nF 2 2K 2 2K 1 2 3 4 5 6 1 2 3 4 5 6 LDO6_1V8 Module Front Camera FL2 FL1 R2 R1 R3 C1 C2 C3 C4 EMI Filter Figure 23 Reference Circuit Design for Front Camera Interface IOmax 100mA LDO17_2V85 129 PO 2 85V output power supply for AVDD of camera 2 85V normal voltage Vnorm 2 85V IOmax 300mA MIPI_CSI1_CLKN 70 AI MIPI CSI clock signal negative MIPI_CSI1_CLKP 71 AI MIPI CSI clock si...

Page 56: ...trace width is recommended to be maintained among MIPI signal lines During impedance matching do not connect GND on different planes so as to ensure impedance consistency It is recommended to select a low capacitance TVS for ESD protection and the recommended parasitic capacitance is below 1pF Route MIPI traces according to the following rules a The total trace length should not exceed 305mm b Con...

Page 57: ... 76 68 MIPI_CSI0_LN1P 14 49 70 MIPI_CSI1_CLKN 17 32 0 13 71 MIPI_CSI1_CLKP 17 45 72 MIPI_CSI1_LN0N 18 89 0 35 73 MIPI_CSI1_LN0P 19 24 Pin Name Pin No I O Description Comment SENSOR_I2C_SCL 91 OD I2C clock signal for external sensor SENSOR_I2C_SDA 92 OD I2C data signal for external sensor GPIO_88 99 DI Gyroscope sensor interrupt signal 2 Default configuration include but not limited to these GPIO p...

Page 58: ...Class D amplifier whose output power is 879mW when VBAT is 4 2V and load is 8Ω The headphone interface features stereo left and right channel output and headphone insert detection function is supported Pin Name Pin No I O Description Comment MIC1P 4 AI Microphone positive input for channel 1 MIC_GND 5 MIC reference ground MIC2P 6 AI Microphone positive input for channel 2 EARP 8 AO Earpiece positi...

Page 59: ...t Design for Microphone MIC1P MIC_GND 0R 0R 100pF MIC NC F2 F1 C1 C3 Module D1 Figure 24 Reference Circuit Design for Microphone Interface 3 21 2 Reference Circuit Design for Receiver Interface EARP EARN F2 NM 0R 0R NM NM C2 C3 C1 F1 Module D1 D2 Figure 25 Reference Circuit Design for Receiver Interface ...

Page 60: ... Design for Loudspeaker Interface EARP EARN F2 SPKP SPKN 0R 0R NM NM C1 C2 F1 Module D1 D2 Figure 27 Reference Circuit Design for Loudspeaker Interface 3 21 5 Audio Interface Design Considerations It is recommended to use the electret microphone In order to decrease radio or other signal interference the position of RF antenna should be kept away from audio interface and audio trace Power trace ca...

Page 61: ...wer 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 For convenient firmware upgrade and debugging in the future please reverse this pin The reference circuit design is shown as below LDO5_1V8 S1 Module USB_BOOT R1 10K D1 Figure 28 Reference Circuit Design for Emergency Download Interface ...

Page 62: ...e bands WLAN wireless communication based on IEEE 802 11a b g n standard protocols The maximum data rate is up to 150 Mbps The features are as below Support Wake on WLAN WoWLAN Support ad hoc mode Support WAPI SMS4 hardware encryption Support AP mode Support Wi Fi Direct Support MCS 0 7 for HT20 and HT40 4 1 1 Wi Fi Performance The following table lists the Wi Fi transmitting and receiving perform...

Page 63: ...2 5dBm 802 11n HT20 MCS0 14dBm 2 5dBm 802 11n HT20 MCS7 12dBm 2 5dBm 802 11n HT40 MCS0 14dBm 2 5dBm 802 11n HT40 MCS7 12dBm 2 5dBm Standard Data Rate Sensitivity 2 4GHz 802 11b 1Mbps 96dBm 802 11b 11Mbps 87dBm 802 11g 6Mbps 91dBm 802 11g 54Mbps 74dBm 802 11n HT20 MCS0 90dBm 802 11n HT20 MCS7 72dBm 802 11n HT40 MCS0 87dBm 802 11n HT40 MCS7 68dBm 5GHz 802 11a 6Mbps 90dBm 802 11a 54Mbps 71dBm 802 11n...

Page 64: ...ximally support up to 3 5 piconets at the same time Support one SCO Synchronous Connection Oriented or eSCO connection The BR EDR channel bandwidth is 1MHz and can accommodate 79 channels The BLE channel bandwidth is 2MHz and can accommodate 40 channels Table 25 BT Data Rate and Version Referenced specifications are listed below Bluetooth Radio Frequency TSS and TP Specification 1 2 2 0 2 0 EDR 2 ...

Page 65: ...e lists the BT transmitting and receiving performance of SC20 WL module Table 26 BT Transmitting and Receiving Performance Transmitter Performance Packet Types DH5 2 DH5 3 DH5 Transmitting Power 10dBm 2 5dBm 8dBm 2 5dBm 8dBm 2 5dBm Receiver Performance Packet Types DH5 2 DH5 3 DH5 Receiving Sensitivity 93dBm 92dBm 86dBm ...

Page 66: ...finition of Wi Fi BT Antenna Table 28 Wi Fi BT Frequency A reference circuit design for Wi Fi BT antenna is shown as below R1 C1 and C2 are mounted according to the actual debugging C1 and C2 are not mounted and a 0Ω resistor is mounted on R1 by default ANT_WIFI BT R1 0R C1 Module 2 4Ghz 5Ghz antenna NM C2 NM Figure 29 Reference Circuit Design for Wi Fi BT Anternna Pin Name Pin No I O Description ...

Page 67: ...of the RF traces is usually determined by the trace width W the materials dielectric constant height from the reference ground to the signal layer H and the clearance between RF traces and grounds S Microstrip or coplanar waveguide is typically used in RF layout to control characteristic impedance The following are reference designs of microstrip or coplanar waveguide with different PCB structures...

Page 68: ...jacent to RF pins should not be designed as thermal relief pads and should be fully connected to ground The distance between the RF pins and the RF connector should be as short as possible and all the right angle traces should be changed to curved ones There should be clearance under the signal pin of the antenna connector or solder joint The reference ground of RF traces should be complete Meanwh...

Page 69: ...Table 29 Antenna Requirements Type Requirements Wi Fi BT VSWR 2 Gain dBi 1 Max Input Power W 50 Input Impedance Ω 50 Polarization Type Vertical Cable Insertion Loss 1dB 5 2 2 Recommended RF Connector for Antenna Installation If RF connector is used for antenna connection it is recommended to use the U FL R SMT connector provided by HIROSE Figure 34 Dimensions of the U FL R SMT Connector Unit mm ...

Page 70: ...onnector 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: ...ted in the following table Table 30 Absolute Maximum Ratings 6 2 Power Supply Ratings Table 31 SC20 WL Module Power Supply Ratings Parameter Min Max Unit VBAT 0 5 6 V USB_VBUS 0 5 16 V Voltage on Digital Pins 0 3 2 3 V Parameter Description Conditions Min Typ Max Unit VBAT VBAT The actual input voltages must stay between the minimum and maximum values 3 5 3 8 4 2 V USB_VBUS USB detection 4 35 5 0 ...

Page 72: ...ng A threshold voltage range 15 62mV stepping up 2 5 2 796 2 984 V Trickle charging B threshold voltage range 18 75mV stepping up 3 0 3 2 3 581 V Charge voltage range 25mV stepping up 4 4 2 4 775 V Charge voltage accuracy 2 Charge current range 90mA stepping up 90 1440 mA Charge current accuracy 10 Charge termination current when charge current is from 90 to 450mA 7 Charge termination current when...

Page 73: ...te Power down 20 uA Sleep state RF sleep 1 4 mA Idle state RF idle 42 7 mA Wi Fi 11b TX 1Mbps 298 mA 11Mbps 281 mA Wi Fi 11g TX 6Mbps 286 mA 54Mbps 188 mA Wi Fi 11n TX 6 5Mbps 20Mhz 275 mA 65Mbps 20Mhz 201 mA 13 5Mbps 40Mhz 269 mA 135Mbps 40Mhz 186 mA Wi Fi 11b RX 120 mA Wi Fi 11g RX 119 mA Wi Fi 11n RX 117 mA BT Tx Channel 0 100 mA BT Tx Channel 38 100 mA BT Tx Channel 78 100 mA BT Rx Channel 38 ...

Page 74: ... ESD sensitive components Proper ESD handling and packaging procedures must be applied throughout the processing handling and operation of any application that incorporates the module The following table shows the electrostatic discharge characteristics of SC20 WL module Table 35 ESD Characteristics Temperature 25 C Humidity 45 Tested Points Contact Discharge Air Discharge Unit VBAT GND 5 10 KV Al...

Page 75: ...7 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 Figure 37 Module Top and Side Dimensions ...

Page 76: ...Smart Wi Fi Module Series SC20 WL Hardware Design SC20 WL_Hardware_Design 75 81 Figure 38 Module Bottom Dimensions Top View ...

Page 77: ...e_Design 76 81 7 2 Recommended Footprint Figure 39 Recommended Footprint Top View 1 For easy maintenance of the module keep about 3mm between the module and other components on host PCB 2 All RESERVED pins should be kept open and MUST NOT be connected to ground NOTES ...

Page 78: ...are_Design 77 81 7 3 Top and Bottom Views of the Module Figure 40 Top View of the Module Figure 41 Bottom View of the Module These are renderings of SC20 W module For authentic dimension and appearance please refer to the module that you received from Quectel NOTE ...

Page 79: ... Mounted within 168 hours at the factory environment of 30ºC 60 RH Stored at 10 RH 3 Devices require baking before mounting if any circumstance below occurs When the ambient temperature is 23º C 5º C and the humidity indication card shows the humidity is 10 before opening the vacuum sealed bag Device mounting cannot be finished within 168 hours at factory conditions of 30ºC 60 4 If baking is requi...

Page 80: ...more details please refer to document 2 It is suggested that the peak reflow temperature ranges from 240 to 245 C for SnAg3 0Cu0 5 alloy The absolute maximum reflow temperature is 245 C To avoid damage to the module caused by repeated heating remounting the module after finishing the reflow soldering of the first side of PCB is highly recommended The recommended reflow soldering thermal profile is...

Page 81: ...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 Max slope 2 to 3 C sec Reflow time D over 220 C 40 to 60 sec Max temperature 240 C 245 C Cooling down slope 1 to 4 C sec Reflow Cycle Max reflow cycle 1 ...

Page 82: ...SC20 WL_Hardware_Design 81 81 Figure 44 Reel Dimensions Table 37 Reel Packaging Model Name MOQ for MP Minimum Package 200pcs Minimum Package 4 800pcs SC20 WL 200 Size 370mm 350mm 85mm N W 1 92kg G W 3 17kg Size 380mm 365mm 365mm N W 7 68kg G W 13 63kg ...

Page 83: ...r Guide 2 Quectel_Module_Secondary_SMT_User_Guide Module Secondary SMT User Guide 3 Quectel_RF_Layout_Application_Note RF Layout Application Note Abbreviation Description ADC Analog to Digital Converter AMR Adaptive Multi rate bps Bits Per Second BT Bluetooth CS Coding Scheme CTS Clear to Send EMMC Embedded Multi Media Card ESD Electrostatic Discharge FR Full Rate FPC Flexible Printed Circuit GND ...

Page 84: ... NTC Negative Temperature Coefficient OTG On The Go PC Personal Computer PCB Printed Circuit Board PDA Personal Data Assistant POS Point Of Sales RF Radio Frequency RH Relative Humidity RHCP Right Hand Circularly Polarized RTC Real Time Clock Rx Receive SAW Surface Acoustic Wave SDIO Secure Digital Input and Output SMD Surface Mount Device TP Touch Panel TV Television TVS Transient Voltage Suppres...

Page 85: ...x Maximum Input Low Level Voltage Value VILmin Minimum Input Low Level Voltage Value VImax Absolute Maximum Input Voltage Value VImin Absolute Minimum Input Voltage Value VOHmax Maximum Output High Level Voltage Value VOHmin Minimum Output High Level Voltage Value VOLmax Maximum Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value VRTC Voltage of Real Time Clock VSWR Voltag...

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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