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LTE Standard Module Series

EC20 R2.1 Mini PCIe Hardware Design

EC20_R2.1_Mini_PCIe_Hardware_Design 37 / 51

6

Electrical, Reliability and Radio

Characteristics

6.1. General Description

This chapter mainly describes the following electrical and radio characteristics of EC20 R2.1 Mini PCIe:



Power supply requirements



I/O requirements



RF characteristics



ESD characteristics



Thermal consideration



Current consumption

6.2. Power Supply Requirements

The input voltage of EC20 R2.1 Mini PCIe is 3.0V~3.6V. The following table shows the power supply

requirements of EC20 R2.1 Mini PCIe.

Table 21: Power Supply Requirements

Parameter

Description

Min.

Typ.

Max.

Unit

VCC_3V3

Power Supply

3.0

3.3

3.6

V

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Summary of Contents for EC20 R2.1

Page 1: ...EC20 R2 1 Mini PCIe Hardware Design LTE Standard Module Series Rev EC20_R2 1_Mini_PCIe_Hardware_Design_V1 1 Date 2019 09 10 Status Released www quectel com ...

Page 2: ...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 ALL INFORMATION SUPPLIED HEREIN ...

Page 3: ... of pin 3 and 5 from RESERVED to COEX_UART_RX and COEX_UART_TX respectively Figure 2 4 Updated pin definition and description of COEX_UART_RX and COEX_UART_TX Table 4 5 Updated reference circuit of USB interface Figure 5 6 Added description of COEX UART interface Chapter 3 6 2 7 Updated reference circuit of U SIM interface with an 8 pin U SIM card connector Figure 7 8 Updated description of PCM in...

Page 4: ...Power Saving 18 3 4 1 Sleep Mode 18 3 4 2 Airplane Mode 19 3 5 Power Supply 19 3 6 UART Interfaces 20 3 6 1 Main UART Interface 20 3 6 2 COEX UART Interface 21 3 7 USB Interface 21 3 8 U SIM Interface 22 3 9 PCM and I2C Interfaces 24 3 10 Control and Indication Signals 27 3 10 1 RI Signal 27 3 10 2 DTR Signal 28 3 10 3 W_DISABLE Signal 28 3 10 4 PERST Signal 28 3 10 5 LED_WWAN Signal 29 3 10 6 WAK...

Page 5: ... 37 6 1 General Description 37 6 2 Power Supply Requirements 37 6 3 I O Requirements 38 6 4 RF Characteristics 38 6 5 ESD Characteristics 40 6 6 Thermal Consideration 40 6 7 Current Consumption 42 7 Dimensions and Packaging 46 7 1 General Description 46 7 2 Mechanical Dimensions of EC20 R2 1 Mini PCIe 46 7 3 Standard Dimensions of Mini PCI Express 47 7 4 Packaging Specifications 48 8 Appendix A Re...

Page 6: ...CONTROL AND INDICATION SIGNALS 27 TABLE 13 AIRPLANE MODE CONTROLLED BY HARDWARE METHOD 28 TABLE 14 AIRPLANE MODE CONTROLLED BY SOFTWARE METHOD 28 TABLE 15 INDICATIONS OF NETWORK STATUS AT QCFG LEDMODE 0 DEFAULT SETTING 29 TABLE 16 INDICATIONS OF NETWORK STATUS AT QCFG LEDMODE 2 30 TABLE 17 GNSS PERFORMANCE 31 TABLE 18 GNSS FREQUENCY 32 TABLE 19 OPERATING FREQUENCIES 33 TABLE 20 ANTENNA REQUIREMENT...

Page 7: ...R 24 FIGURE 8 TIMING IN PRIMARY MODE 25 FIGURE 9 TIMING IN AUXILIARY MODE 26 FIGURE 10 REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC 26 FIGURE 11 RI BEHAVIORS 27 FIGURE 12 TIMING OF RESETTING MODULE 29 FIGURE 13 LED_WWAN SIGNAL REFERENCE CIRCUIT DIAGRAM 29 FIGURE 14 WAKE BEHAVIOR 30 FIGURE 15 DIMENSIONS OF THE RECEPTACLE RF CONNECTORS UNIT MM 35 FIGURE 16 MECHANICALS OF U FL LP MATING PLUG...

Page 8: ... with customers applications This document helps customers quickly understand module interface specifications electrical characteristics mechanical specifications and other related information of the module To facilitate application designs it also includes some reference designs for customers reference The document coupled with application notes and user guides makes it easy to design and set up ...

Page 9: ...ing an aircraft Please consult the airline staff for more restrictions on the use of wireless devices on boarding the aircraft Wireless devices may cause interference on sensitive medical equipment so please be aware of the restrictions on the use of wireless devices when in hospitals clinics or other healthcare facilities Cellular terminals or mobiles operating over radio signals and cellular net...

Page 10: ...e can be applied in the following fields PDA and Laptop Computer Remote Monitor System Vehicle System Wireless POS System Intelligent Meter Reading System Wireless Router and Switch Other Wireless Terminal Devices Table 1 Supported Bands of EC20 R2 1 Mini PCIe 1 EC20 R2 1 Mini PCIe contains Telematics version and Data only version Telematics version supports voice and data functions while Data onl...

Page 11: ...DCS1800 8 PSK Class 3 24dBm 2 1dB for EVDO CDMA BC0 Class 3 24dBm 1 3dB for WCDMA bands Class 2 24dBm 1 3dB for TD SCDMA bands Class 3 23dBm 2dB for LTE FDD bands Class 3 23dBm 2dB for LTE TDD bands LTE Features Support up to 3GPP R8 non CA Cat 4 FDD and TDD Support 1 4 3 5 10 15 20MHz RF bandwidth Support MIMO in DL direction LTE FDD Max 150Mbps DL Max 50Mbps UL LTE TDD Max 130Mbps DL Max 30Mbps ...

Page 12: ... 3 0V UART Interfaces Main UART Support RTS and CTS hardware flow control Baud rate can reach up to 230400bps 115200bps by default Used for AT command communication and data transmission COEX UART LTE WLAN BT coexistence UART Audio Features Support one digital audio interface PCM interface GSM HR FR EFR AMR AMR WB WCDMA AMR AMR WB LTE AMR AMR WB Support echo cancellation and noise suppression PCM ...

Page 13: ...lerances When the temperature returns to normal operation temperature levels the module will meet 3GPP specifications again 3 means under development Rx diversity Support LTE WCDMA Rx diversity Optional GNSS Features Gen8C Lite of Qualcomm Protocol NMEA 0183 Data update rate 10Hz by default AT Commands Compliant with 3GPP TS 27 007 27 005 and Quectel enhanced AT commands Physical Characteristics S...

Page 14: ...ollowing figure shows the block diagram of EC20 R2 1 Mini PCIe EC20 R2 1 Module PCM I2C Mini PCI Express Interface USB W_DISABLE PERST LED_WWAN Main Antenna Connector VCC Main Antenna VBAT GNSS Antenna Connector GNSS Antenna Boost Circuit Diversity Antenna Connector Diversity Antenna WAKE UART DTR RI U SIM Figure 1 Functional Diagram ...

Page 15: ...g figure shows the pin assignment of EC20 R2 1 Mini PCIe module The top side contains EC20 R2 1 module and antenna connectors PIN2 PIN52 BOT PIN1 PIN51 TOP Pin Name Pin No WAKE 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 COEX_UART_RX COEX_UART_TX RESERVED GND UART_RX UART_TX GND RI RESERVED GND UART_CTS UART_RTS GND GND DTR RESERVED GND GND VCC_3V3 VCC_3V3 GND PCM_CLK ...

Page 16: ...t PO Power Output Pin No Mini PCI Express Standard Name EC20 R2 1 Mini PCIe Pin Name I O Description Comment 1 WAKE WAKE OC Output signal used to wake up the host 2 3 3Vaux VCC_3V3 PI 3 0V 3 6V typically 3 3V DC supply 3 RESERVED COEX_UART_RX 1 DI LTE WLAN BT coexistence signal It is prohibited to be pulled up to high level before startup 4 GND GND Mini card ground 5 RESERVED COEX_UART_TX 1 DO LTE...

Page 17: ...GND GND Mini card ground 16 UIM_VPP RESERVED Reserved 17 RESERVED RI DO Ring indication 18 GND GND Mini card ground 19 RESERVED RESERVED Reserved 20 W_DISABLE W_DISABLE DI Airplane mode control Active low 21 GND GND Mini card ground 22 PERST PERST DI Fundamental reset signal Active low 23 PERn0 UART_CTS DI UART clear to send Connect to DTE s RTS 24 3 3Vaux RESERVED Reserved 25 PERp0 UART_RTS DO UA...

Page 18: ...round 38 USB_D USB_DP IO USB differential data Require differential impedance of 90Ω 39 3 3Vaux VCC_3V3 PI 3 0V 3 6V typically 3 3V DC supply 40 GND GND Mini card ground 41 3 3Vaux VCC_3V3 PI 3 0V 3 6V typically 3 3V DC supply 42 LED_WWAN LED_WWAN OC LED signal for indicating the network status of the module 43 GND GND Mini card ground 44 LED_WLAN USIM_PRESENCE DI U SIM card insertion detection 45...

Page 19: ...ionality Mode AT CFUN command can set the module to a minimum functionality mode without removing the power supply In this case both RF function and U SIM card will be invalid Airplane Mode AT CFUN command or W_DISABLE pin can set the module to airplane mode In this case RF function will be invalid Sleep Mode In this mode the current consumption of the module will be reduced to the minimal level I...

Page 20: ...rk the input peak current may reach 2 7A during the transmitting time Therefore the power supply must be able to provide a rated output current of 2 7A at least and a bypass capacitor of no less than 470µF with low ESR should be used to prevent the voltage from dropping The following figure shows a reference design of power supply where R2 and R3 are 1 tolerance resistors and C3 is a low ESR capac...

Page 21: ...data transmission The following table shows the pin definition of the main UART interface Table 7 Pin Definition of Main UART Interface The signal level of main UART interface is 3 3V When connecting to the peripheral MCU RAM customers need to pay attention to the signal direction The reference circuit is as follows MCU ARM TXD RXD UART_RXD UART_TXD UART_RTS UART_CTS RTS CTS GND Module GND Voltage...

Page 22: ... device Meanwhile it supports high speed 480Mbps mode and full speed 12Mbps mode The USB interface is used for AT command communication data transmission GNSS NMEA output software debugging firmware upgrade and voice over USB The following table shows the pin definition of USB interface Table 9 Pin Definition of USB Interface The following figure shows a reference circuit of USB interface Pin Name...

Page 23: ...short as possible Please follow the requirements below during USB interface design so as to meet USB 2 0 specification It is important to route the USB signal traces as differential pairs with total grounding The impedance of USB differential trace is 90Ω Do not route signal traces under crystals oscillators magnetic devices or RF signal traces It is important to route the USB differential traces ...

Page 24: ..._RST USIM_CLK USIM_DATA USIM_PRESENCE 100nF GND GND 33pF 33pF 33pF VCC RST CLK IO VPP GND GND USIM_VDD 15K U SIM Card Connector Module 0R 0R 0R Figure 6 Reference Circuit of U SIM Interface with an 8 pin U SIM Card Connector If U SIM card detection function is not needed please keep USIM_PRESENCE unconnected A reference circuit for U SIM interface with a 6 pin U SIM card connector is illustrated i...

Page 25: ...A and USIM_CLK keep them away from each other and shield them with surrounded ground In order to offer good ESD protection it is recommended to add a TVS diode with parasitic capacitance not exceeding 15pF The 0Ω resistors should be added in series between the module and the U SIM card connector so as to facilitate debugging The 33pF capacitors are used for filtering interference of EGSM900 Please...

Page 26: ...SYNC falling edge represents the MSB In this mode the PCM interface supports 256kHz 512kHz 1024kHz or 2048kHz PCM_CLK at 8kHz PCM_SYNC and also supports 4096kHz PCM_CLK at 16kHz PCM_SYNC The following figure shows the timing relationship in primary mode with 8kHz PCM_SYNC and 2048kHz PCM_CLK PCM_CLK PCM_SYNC PCM_DOUT MSB LSB MSB 125us 1 2 256 255 PCM_DIN MSB LSB MSB Figure 8 Timing in Primary Mode...

Page 27: ...PCM_DIN 125us MSB 1 2 32 31 LSB Figure 9 Timing in Auxiliary Mode Clock and mode can be configured by AT command and the default configuration is master mode using short frame synchronization format with 2048kHz PCM_CLK and 8kHz PCM_SYNC In addition EC20 R2 1 Mini PCIe s firmware has integrated the configuration on some PCM codec s application with I2C interface Please refer to document 2 for deta...

Page 28: ...be used to wake up the host When a URC returns there will be the following behaviors on the RI pin after executing AT QCFG risignaltype physical High Low 120ms URC return Figure 11 RI Behaviors Pin Name Pin No I O Power Domain Description RI 17 DO 3 3V Output signal used to wake up the host DTR 31 DI 3 3V Sleep mode control W_DISABLE 20 DI 3 3V Airplane mode control Pulled up by default Active low...

Page 29: ...be used to enable the function Driving it to low level can make the module enter airplane mode Table 13 Airplane Mode Controlled by Hardware Method Software method can be controlled by AT CFUN and has the same effect with W_DISABLE signal function the details are as follows Table 14 Airplane Mode Controlled by Software Method 3 10 4 PERST Signal The PERST signal can be used to force a hardware res...

Page 30: ...educe the current of the LED a resistor must be placed in series with the LED The LED is emitting light when the LED_WWAN output signal is low LED_WWAN VCC R Figure 13 LED_WWAN Signal Reference Circuit Diagram There are two indication modes for LED_WWAN signal to indicate network status which can be switched through following AT commands AT QCFG ledmode 0 Default setting AT QCFG ledmode 2 The foll...

Page 31: ...vel Light ON Registered on network successfully High Impedance Light OFF No network coverage or not registered W_DISABLE signal is at low level Disable RF AT CFUN 0 AT CFUN 4 3 10 6 WAKE Signal The WAKE signal is an open collector signal which is similar to RI signal but a host pull up resistor and AT QCFG risignaltype physical command are required When a URC returns a 120ms low level pulse will b...

Page 32: ...interface by default By default EC20 R2 1 Mini PCIe GNSS engine is switched off It has to be switched on via AT command For more details about GNSS engine technology and configurations please refer to document 3 4 2 GNSS Performance Table 17 GNSS Performance Parameter Description Conditions Typ Unit Sensitivity GNSS Cold start Autonomous 146 dBm Reacquisition Autonomous 157 dBm Tracking Autonomous...

Page 33: ...ensitivity the minimum GNSS signal power required for the module to maintain lock within 3 minutes after loss of lock 3 Cold start sensitivity the minimum GNSS signal power at which the module can fix position successfully within 3 minutes after executing cold start command 4 3 GNSS Frequency Table 18 GNSS Frequency Type Frequency Unit GPS 1575 42 1 023 MHz GLONASS 1597 5 1605 8 MHz Galileo 1575 4...

Page 34: ...ault The impedance of the antenna connectors is 50Ω 5 1 1 Operating Frequency Table 19 Operating Frequencies 3GPP Band Transmit Receive Unit EGSM900 880 915 925 960 MHz DCS1800 1710 1785 1805 1880 MHz EVDO CDMA BC0 824 849 869 894 MHz WCDMA B1 1920 1980 2110 2170 MHz WCDMA B8 880 915 925 960 MHz TD SCDMA B34 2010 2025 2010 2025 MHz TD SCDMA B39 1880 1920 1880 1920 MHz LTE FDD B1 1920 1980 2110 217...

Page 35: ...MHz 1609MHz Polarization RHCP or linear VSWR 2 Typ Passive antenna gain 0dBi Active antenna noise figure 1 5dB Active antenna gain 0dBi Active antenna embedded LNA gain 17dB GSM EVDO CDMA UMTS TD SCDMA LTE VSWR 2 Efficiency 30 Max input power 50W Input impedance 50Ω Cable insertion loss 1dB EGSM900 WCDMA B8 LTE FDD B5 B8 EVDO CDMA BC0 Cable insertion loss 1 5dB DCS1800 WCDMA B1 LTE FDD B1 B3 LTE T...

Page 36: ...ion EC20 R2 1 Mini PCIe is mounted with RF connectors receptacles for convenient antenna connection The dimensions of the antenna connectors are shown as below Figure 15 Dimensions of the Receptacle RF Connectors Unit mm U FL LP mating plugs listed in the following figure can be used to match the receptacles Figure 16 Mechanicals of U FL LP Mating Plugs ...

Page 37: ...ardware Design EC20_R2 1_Mini_PCIe_Hardware_Design 36 51 The following figure describes the space factor of mating plugs Figure 17 Space Factor of Mating Plugs Unit mm For more details of the recommended mating plugs please visit http www hirose com ...

Page 38: ...radio characteristics of EC20 R2 1 Mini PCIe Power supply requirements I O requirements RF characteristics ESD characteristics Thermal consideration Current consumption 6 2 Power Supply Requirements The input voltage of EC20 R2 1 Mini PCIe is 3 0V 3 6V The following table shows the power supply requirements of EC20 R2 1 Mini PCIe Table 21 Power Supply Requirements Parameter Description Min Typ Max...

Page 39: ...is 0 5V 6 4 RF Characteristics The following tables show the conducted RF output power and receiving sensitivity of EC20 R2 1 Mini PCIe module Table 23 EC20 R2 1 Mini PCIe Conducted RF Output Power Parameter Description Min Max Unit VIH Input High Voltage 0 7 VCC_3V3 VCC_3V3 0 3 V VIL Input Low Voltage 0 3 0 3 VCC_3V3 V VOH Output High Voltage VCC_3V3 0 5 VCC_3V3 V VOL Output Low Voltage 0 0 4 V F...

Page 40: ...2dBm CDMA BC0 108dBm NA NA 104dBm TD SCDMA B34 110dBm NA NA 108dBm TD SCDMA B39 110dBm NA NA 108dBm WCDMA B1 110dBm 109 5dBm 112dBm 106 7dBm WCDMA B8 110dBm 109 5dBm 112dBm 103 7dBm LTE FDD B1 10MHz 99dBm 99 3dBm 101 6dBm 96 3dBm LTE FDD B3 10MHz 98dBm 98 9dBm 101 9dBm 93 3dBm LTE FDD B5 10MHz 98dBm 99 8dBm 102dBm 94 3dBm LTE FDD B8 10MHz 99dBm 99 6dBm 102 1dBm 93 3dBm LTE TDD B38 10MHz 99dBm 98 5...

Page 41: ...ot apply solder mask on the PCB area where the module is mounted so as to ensure better heat dissipation performance The reference ground of the area where the module is mounted should be complete and add ground vias as many as possible for better heat dissipation Add a heatsink on the top of the module and the heatsink should be designed with as many fins as possible to increase heat dissipation ...

Page 42: ...p reaches or exceeds 105 C the module works normal but provides reduced performance such as RF output power data rate etc When the maximum BB chip temperature reaches or exceeds 115 C the module will disconnect from the network and it will recover to network connected state after the maximum temperature falls below 115 C Therefore the thermal design should be maximally optimized to make sure the m...

Page 43: ...disconnected 3 98 mA DCS DRX 2 USB disconnected 4 64 mA DCS DRX 5 USB disconnected 3 80 mA DCS DRX 5 USB suspend 3 57 mA DCS DRX 9 USB disconnected 3 67 mA TD SCDMA Band A PF 64 USB disconnected 3 98 mA TD SCDMA Band A PF 128 USB disconnected 3 78 mA TD SCDMA Band A PF 256 USB disconnected 3 40 mA TD SCDMA Band A PF 512 USB disconnected 3 29 mA BC0 SCI 1 USB disconnected 6 45 mA BC0 SCI 1 USB susp...

Page 44: ... 3 85 mA Idle state EGSM DRX 5 USB disconnected 25 67 mA EGSM DRX 5 USB connected 36 88 mA BC0 SCI 1 USB disconnected 27 14 mA BC0 SCI 1 USB connected 38 66 mA TD SCDMA Band A PF 64 USB disconnected 25 07 mA TD SCDMA Band A PF 64 USB connected 37 92 mA WCDMA PF 64 USB disconnected 26 20 mA WCDMA PF 64 USB connected 36 97 mA LTE FDD PF 64 USB disconnected 25 64 mA LTE FDD PF 64 USB connected 36 98 ...

Page 45: ...4DL 1UL 26 20dBm 186 1 mA DCS1800 3DL 2UL 26 10dBm 296 7 mA DCS1800 2DL 3UL 27 67dBm 445 4 mA DCS1800 1DL 4UL 27 55dBm 574 0 mA CDMA TD SCDMA data transfer GNSS OFF BC0 23 55dBm 764 1 mA TD SCDMA Band A 23 18dBm 161 3 mA TD SCDMA Band F 23 42dBm 164 8 mA WCDMA data transfer GNSS OFF WCDMA B1 HSDPA 22 03dBm 710 4 mA WCDMA B1 HSUPA 22 02dBm 747 8 mA WCDMA B8 HSDPA 21 68dBm 607 7 mA WCDMA B8 HSUPA 21...

Page 46: ...49dBm 212 2 mA DCS1800 PCL 7 16 47dBm 155 7 mA DCS1800 PCL 15 0 24dBm 129 4 mA CDMA voice call BC0 23 87dBm 822 5 mA BC0 60 67dBm 146 1 mA WCDMA voice call WCDMA B1 23 05dBm 865 8 mA WCDMA B8 23 1dBm 718 5 mA Table 27 GNSS Current Consumption of EC20 R2 1 Mini PCIe Parameter Description Conditions Typ Unit IVBAT GNSS Searching AT CFUN 0 Cold start Passive Antenna 63 3 mA Lost state Passive Antenna...

Page 47: ...ule All dimensions are measured in millimeter mm and the dimensional tolerances are 0 05mm unless otherwise specified 7 2 Mechanical Dimensions of EC20 R2 1 Mini PCIe 10 35 0 10 34 30 0 20 4 00 0 10 48 05 0 20 6 35 0 10 2xΦ2 60 0 1 3x3 00 0 10 5 98 0 10 6 38 0 10 5 45 0 10 8 25 0 10 24 20 0 20 30 00 0 15 Pin1 Pin51 1 00 0 10 7 26 0 10 9 90 0 10 1 40 0 10 4 90 0 20 0 61 0 05 2 35 0 10 50 95 0 15 To...

Page 48: ...wing figure shows the standard dimensions of Mini PCI Express Please refer to document 1 for Detail A and Detail B Figure 20 Standard Dimensions of Mini PCI Express EC20 R2 1 Mini PCIe adopts a standard Mini PCI Express connector which compiles with the directives and standards listed in document 1 The following figure takes the Molex 679100002 as an example ...

Page 49: ...ini_PCIe_Hardware_Design 48 51 Figure 21 Dimensions of the Mini PCI Express Connector Molex 679100002 7 4 Packaging Specifications EC20 R2 1 Mini PCIe modules are packaged in a tray Each tray contains 10 modules The smallest package of EC20 R2 1 Mini PCIe contains 100 modules ...

Page 50: ...mmands_Manual EC20 R2 1 AT commands manual 3 Quectel_LTE_Standard_GNSS_AT_ Commands_Manual GNSS AT commands manual for LTE Standard modules 4 Quectel_LTE_Module_Thermal_Design_Guide Thermal design guide for LTE standard LTE A and Automotive modules Abbreviation Description AMR Adaptive Multi rate bps Bits Per Second CS Coding Scheme CTS Clear to Send DC HSPA Dual carrier High Speed Packet Access D...

Page 51: ...hift Keying GNSS Global Navigation Satellite System GPS Global Positioning System GSM Global System for Mobile Communications HR Half Rate kbps Kilo Bits Per Second LED Light Emitting Diode LTE Long Term Evolution Mbps Million Bits Per Second MCU Micro Control Unit ME Mobile Equipment MIMO Multiple Input Multiple Output MMS Multimedia Messaging Service MO Mobile Originated MT Mobile Terminated NME...

Page 52: ...eceive Direction SIMO Single Input Multiple Output SMS Short Message Service TX Transmitting Direction TVS Transient Voltage Suppressor UART Universal Asynchronous Receiver Transmitter UL Up Link URC Unsolicited Result Code USB Universal Serial Bus U SIM Universal Subscriber Identification Module WCDMA Wideband Code Division Multiple Access WLAN Wireless Local Area Networks ...

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