Sony FF051021 GSM/GPRS 850/900/1800/1900 Module User Manual Exhibit 8

Sony Mobile Communications Inc GSM/GPRS 850/900/1800/1900 Module Exhibit 8

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FF051021 User Manual

Exhibit 8 user manual

Confidential INTERFACE DESCRIPTION 1(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 EDGE EE5x Interface Specification The information contained in this document is the proprietary information of Sony Ericsson Mobile Communications International. The contents are confidential and any disclosure to persons other than the officers, employees, agents or subcontractors of the owner or licensee of this document, without the prior written consent of Sony Ericsson Mobile Communications International, is strictly prohibited. Further, no portion of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, without the prior written consent of Sony Ericsson Mobile Communications International, the copyright holder.

Confidential INTERFACE DESCRIPT 2(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Sony Ericsson Mobile Communications International publishes this document without making any warranty as to the content contained herein. Further Sony Ericsson Mobile Communications International reserves the right to make modifications, additions and deletions to this document due to typographical errors, inaccurate information, or improvements to programs and/or equipment at any time and without notice. Such changes will, nevertheless be incorporated into new editions of this document. All rights reserved. © Sony Ericsson Mobile Communications International, 2005 Revision Information PA1 Sep 2005 First release

Confidential INTERFACE DESCRIPT 3(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Contents Part 1 : Overview ...............................................................................................4 1 Introduction..........................................................................................5 1.1 Target Users........................................................................................6 1.2 Prerequisites........................................................................................6 1.3 Notation ...............................................................................................6 2 EDGE Wireless Modem.......................................................................7 2.1 EDGE Wireless Modem in a Communication System .........................7 2.2 Functional Block Diagram....................................................................9 2.3 Features ............................................................................................10 2.3.1 Mobile Station Characteristics ...........................................................10 2.3.2 Environmental Conditions..................................................................11 2.4 SIM Card ...........................................................................................11 2.5 Other Features ..................................................................................11 2.6 Precautions........................................................................................11 Part 2 : Daughter Card Description .................................................................12 3 Mechanical Description .....................................................................13 3.1 Physical Detail ...................................................................................13 3.2 Variant Information ............................................................................14 3.2.1 Board Outline.....................................................................................14 3.2.2 System Connector .............................................................................14 4 System Interface................................................................................15 4.1 Overview............................................................................................15 4.1.1 System Connector .............................................................................15 4.2 Electrical Interface Detail Format.......................................................18 5 Electrical Interface .............................................................................19 5.1 Power Interfaces................................................................................19 5.1.1 VIN.....................................................................................................20 5.1.2 3V3 ....................................................................................................21 5.1.3 VREF .................................................................................................21 5.1.4 GND...................................................................................................22 5.2 Status Interfaces................................................................................23 5.2.1 UVP ...................................................................................................23 5.2.2 OVP ...................................................................................................24 5.2.3 RI .......................................................................................................24 5.2.4 LED....................................................................................................25 5.2.5 VREF .................................................................................................25 5.3 Data Communication and Control Interfaces.....................................26 5.3.1 USB Interface ....................................................................................26 5.3.2 P_EN .................................................................................................26 5.4 ANTENNA CONNECTOR .................................................................27 6 Rudimentary Circuit Functions ..........................................................28 6.1 Power On Sequence .........................................................................28 6.2 Power Off Sequence .........................................................................29 6.3 USB communications information .....................................................30

Confidential INTERFACE DESCRIPT 4(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Part 1 : Overview

Confidential INTERFACE DESCRIPT 5(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 1 Introduction The EDGE Daughter Card is a total solution designed as an add-in option for integrators of the host product. The Daughter Card comprises of several component parts: • EDGE wireless modem, which is the wireless enabling circuitry integrated on to the Daughter Card PCB together with its mechanical RF shielding • RF connector, which provides physical connectivity between the Daughter Card and the antenna which is integrated in to the notebook mechanical housing • Voltage regulation circuitry, which converts raw unregulated power from the host battery to the core regulated voltage to the EDGE wireless components • System connector, which provided the data, control, power and status interface between the host and the wireless modem • SIM connector, a combined connector and retention device for the users Subscriber Identity Module (SIM) card EDGE WIRELESSCIRCUITRYVOLTAGEREGULATIONSYSTEMCONNECTORRF ANTENNACONNECTORDAUGHTERCARDSIMCONNECTOREDGE WIRELESSCIRCUITRYVOLTAGEREGULATIONSYSTEMCONNECTORRF ANTENNACONNECTORDAUGHTERCARDSIMCONNECTOR Figure 1.1-1 EDGE Daughter Card Component Parts

Confidential INTERFACE DESCRIPT 6(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 1.1 Target Users 1.2 Prerequisites Integration of the EE5x Daughter Card may be performed at facilities under customer management. 1.3 Notation EDGE (Enhanced Data rate for GSM Evolution) is the wireless-enabling technology. The EDGE Daughter Card describes the deliverable product. The EDGE Daughter Card is a PCB assembly with the components described on the previous page integrated on to the board. The complete assembly is reffered in this document as the DC (DC=Daughter Card ).

Confidential INTERFACE DESCRIPT 7(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 2 EDGE Wireless Modem 2.1 EDGE Wireless Modem in a Communication System Figure 2.1-1 illustrates the main blocks of a wireless communication system using the EDGE Daughter Card embedded in a host device. It also shows the communication principles of the system. The definitions in the figure, as used elsewhere in this manual, are in accordance with the recommendations of GSM 07.07. • The MS (mobile station) represents the EDGE Daughter Card modem plus SIM card. • The modem excluding SIM card, is known as the ME (mobile equipment). • The TE (terminal equipment) is a micro-controller (i.e., the host) and is a part of the application. Figure 2.1-1 Main Blocks in a Wireless System In accordance with the recommendations of ITU-T (International Telecommunication Union - Telecommunications Standardisation Sector) V.24, the TE communicates with the MS over a serial interface. This is the Universal Serial Bus (USB). The functions of the EDGE modem follow the recommendations provided by ETSI (European Telecommunications Standards Institute) and ITU-T. ETSI specifies a set of AT commands for controlling the GSM/E-GSM element of the modem; these commands are supplemented by Sony Ericsson specific commands. Figure 2.1-2 Interface between Daughter Card and Application illustrates the interface between the Daughter Card and the host application. Each interface signal is described in Section 3.

Confidential INTERFACE DESCRIPT 8(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 TE(DTE)MS(EDGEMODEM)SIMPowerPowerSYSTEM CONNECTORVoltageRegVoltageRegControlStatusAntennaCommunicationHOST EQUIPMENTTE(DTE)MS(EDGEMODEM)SIMPowerPowerSYSTEM CONNECTORVoltageRegVoltageRegControlStatusAntennaCommunicationHOSTTE(DTE)MS(EDGEMODEM)SIMPowerPowerSYSTEM CONNECTORVoltageRegVoltageRegControlStatusAntennaCommunicationHOST EQUIPMENTTE(DTE)MS(EDGEMODEM)SIMPowerPowerSYSTEM CONNECTORVoltageRegVoltageRegControlStatusAntennaCommunicationHOST Figure 2.1-2 Interface between Daughter Card and Application Note that ITU-T standards define TE and TA as DTE (Data Terminal Equipment) and DCE (Data Circuit Terminating Equipment) respectively.

Confidential INTERFACE DESCRIPT 9(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 2.2 Functional Block Diagram A function representation of the EDGE duaghter card is included in the figure below. Figure 2.2-1 EDGE Daughter Card Functional Block Diagram CACHEArbiterDMABridgeJTAGInterruptControlBootROMSharedMemoryExternalMemoryPowerMngmtChannelCodingBridgeXRAMDROMYRAMPROMPRAMARM926EJTeakLiteDSPInterruptControlA5EncryptEqualizerViterbiAccelPowerControlTX/RXStateMachineGSMTimerRFSerialPortBurstBufferAGCRegisterAGCDAC32kHzXTAL13MHz VCXOPROCESSOR BUS90° :4:4:2PLLBurstBufferAFCRegisterPGAD-SADCModMODDACAFCDAC90°90°90° :2PADACPARAMSIMUSBGPIOMEMORYVOLTAGE REGULATORSOV & SCCTPROTECTIONSYSTEM CONNECTORPOWER USB LEDVPASIM INTERFACELEVELSHIFTERPOWER STATUSLOOP FILTERRX SAWFILTERSbiasPA limiterBALUNDRIVERSWITCHfixed VAPCVPAANT SWITCHBASEBAND ASICRF TRANSCEIVER ASICANTENNACONNECTOREDGE MODULEDAUGHTER CARDUART UARTTEST INTERFACEPLLfixed VAPCSWITCHINGREGULATORVOLTREGSerialControlRICACHEArbiterDMABridgeJTAGInterruptControlBootROMSharedMemoryExternalMemoryPowerMngmtChannelCodingBridgeXRAMDROMYRAMPROMPRAMARM926EJTeakLiteDSPInterruptControlA5EncryptEqualizerViterbiAccelPowerControlTX/RXStateMachineGSMTimerRFSerialPortBurstBufferAGCRegisterAGCDAC32kHzXTAL13MHz VCXOPROCESSOR BUS90° :4:4:2PLLBurstBufferAFCRegisterPGAD-SADCD-SADCModMODDACMODDACAFCDACAFCDAC90°90°90° :2PADACPADACPARAMSIMUSBGPIOMEMORYVOLTAGE REGULATORSOV & SCCTPROTECTIONSYSTEM CONNECTORPOWER USB LEDVPASIM INTERFACELEVELSHIFTERPOWER STATUSLOOP FILTERRX SAWFILTERSbiasPA limiterBALUNDRIVERSWITCHfixed VAPCVPAANT SWITCHBASEBAND ASICRF TRANSCEIVER ASICANTENNACONNECTOREDGE MODULEDAUGHTER CARDUART UARTTEST INTERFACEPLLfixed VAPCSWITCHINGREGULATORVOLTREGSerialControlRI

Confidential INTERFACE DESCRIPT 10(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 2.3 Features The EDGE modem performs a set of telecom services (TS) according to GSM standard phase 2+, ETSI and ITU-T. The functions of the modem are implemented by issuing AT commands over a serial interface. 2.3.1 Mobile Station Characteristics The EDGE modem can be configured for single, dual, triple and quad band GSM functionality. The quad band characteristics of the EDGE modem are shown in the following table. EDGE MODEM GSM850 E-GSM900 GSM1800 GSM1900 Frequency range (MHz) TX: 824-849 RX: 869-894 TX: 880-915 RX: 925-960 TX: 1710-1785 RX: 1805-1880 TX: 1850-1910 RX: 1930-1990 Channel spacing 200kHz Number of channels 123 x 8 (TDMA) 173 x 8 (TDMA) 373 x 8 (TDMA) 298 x 8 (TDMA) Duplex spacing 45MHz 95MHz 80MHz GSM/GPRS GMSK Modulation EDGE 8-PSK Nom. TBD Tx phase accuracy (burst) Max. <5° rms phase error ; <20° max peak phase error 100KHz <+0.5dB 200KHz <-30dB 250KHz <-33dB Tx Spectrum Due to Modulation 400KHz <-58dB 100KHz <-23dBm 200KHz <-26dBm 250KHz <-32dBm Tx Spectrum Due to Switching Transients 400KHz <-36dBm Receiver sensitivity (ANT pin) <-102dBm <-102dBm <-102dBm <-102dBm Class Class 4 Class 1 GSM Nom. +33dBm +30dBm Class Class E2 Class E2 Transmitter output power (ANT conn) EDGE Nom. +27dBm +26dBm Nom.1 <-104dBm <-104dBm <-104dBm <-104dBm Receiver sensitivity (ANT connector) Max. <-102dBm <-102dBm <-102dBm <-102dBm f1 -49dBm Rx Intermodulation F0 = 2f1-f2; |f2–f1| = 800KHz f2 -49dBm GPRS operation Class 10 1 - Design aim Note that the number of frequency bands available will be dependant upon the factory configuration.

Confidential INTERFACE DESCRIPT 11(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 2.3.2 Environmental Conditions The DC will support the following environmental conditions Temperature Range (Full GSM Specification)1 -10oC to +55oC Temperature Range (Operational) 2 -20oC to +65oC Storage Temperature Range -20°C to +75°C Table 2.3-1 Environmental Conditions Notes 1. Full compliance to Type Approval and Regulatory Approval requirements between these temperature ranges 2. Design Verification Testing (DVT) and Operational compliance between these temperature ranges. 2.4 SIM Card An external SIM card with 3V or 1.8V technology, can be connected to the modem via the SIM interface pins. 2.5 Other Features The EDGE modem supports a number of additional features including • 07.10 multiplexing (normal mode) • SIM application tool kit 2.6 Precautions The EDGE modem device is ESD protected up to 4K V contact and 8K V air discharge. It is recommended that integrators follow electronic device handling precautions when working with any electronic device system to ensure no damage occurs to the host or the radio device. The EDGE modem is integrated on to the daughter card. When the card is mounted in the host it is the responsibility of the integrator to ensure that static discharge protection beyond the voltages specified above are designed in to the host product. If exposed, the antenna is a vulnerable contact point for ESD.

Confidential INTERFACE DESCRIPT 12(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Part 2 : Daughter Card Description

Confidential INTERFACE DESCRIPT 13(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 3 Mechanical Description 3.1 Physical Detail Dimensional details given here are for reference only. For mechanical design data, please refer to the mechanical outline drawings. Figure 3.1-1 Layout Detail (reference only)

Confidential INTERFACE DESCRIPT 14(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Figure 3.1-2 Layout Detail – Reservoir capacitor version (reference only) 3.2 Variant Information As evident from the preceding section, there is more than one version of the Daughter Card. The “/3” version notably differs from the “/2” version by the type of system connector and board mounting hole locations. This section will describe in detail the differences between the variants. 3.2.1 Board Outline The board outline differences have been made to accommodate the reservoir capacitor. 3.2.2 System Connector The system connector mounted on the various versions is summarized in the following table. Additional information on the system connector can be found in section 4.1.1 Variant P/N Connector Type Connector Lead Free Status TBD Vertical mount Lead Free Note: The lead-free status should be considered when selecting the mating FFC/FPC.

Confidential INTERFACE DESCRIPT 16(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Dimension A B C D 11.5 (0.453) 12.5 (0.492) 14.5 (0.571) 16.5 (0.650) Figure 4-2 Right Angle Connector Detail

Confidential INTERFACE DESCRIPT 17(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Pin Name Function 1 USB_DN USB differential (-) line 2 USB_DP USB differential (+) line 3 VREF Modem logic voltage reference output from daughter card 4 OVP Over voltage protection output from daughter card 5 SPARE 6 SPARE 7 SPARE 8 GND Ground 9 GND Ground 10 GND Ground 11 GND Ground 12 GND Ground 13 GND Ground 14 VIN Voltage input from host application 15 VIN Voltage input from host application 16 VIN Voltage input from host application 17 VIN Voltage input from host application 18 VIN Voltage input from host application 19 VIN Voltage input from host application 20 RI Ring Indicator output from daughter card 21 3V3 Application reference voltage input to daughter card 22 LED Pulsing LED output from daughter card 23 UVP Under voltage & short circuit protection output from daughter card 24 P_EN Power ON enable input to daughter card Table 4.1-2 Pin List

Confidential INTERFACE DESCRIPT 18(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 4.2 Electrical Interface Detail Format Details of each electrical interface is contained in paragraph 5 (beginning page 19). The description of each interface follows a common format. An example is shown below: Interface Name This is the name of the interface; usually this is the actual name found in the pin list; sometimes this is a collective name for a number of signals, such as the example shown here for a UART. Function: This identifies the basic function of the interface; some interfaces are grouped according to their functional sub-class. Description: The description contains a basic overview of the interface and its functional relationship with the host. Pin Numbers: All pin numbers associated with the interface are listed; these will not necessarily be in numerical order but may be arranged to coincide with signal name list. Signal Names: All sigal names associated with the interface exactly as shown in the pin list; the signal names also contain information on signal flow direction. If not used: This gives specific details, for each signal, of how to terminate the physical connection if it is not required by the host; failure to observe this convention may result in unstable operation of the EDGE modem. (This may not be necessary in the host application since all signals have a defined function).

Confidential INTERFACE DESCRIPT 19(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 5 Electrical Interface This section describes each signal line of the electrical interface between the EDGE modem and the host application. A summary of the function of each signal is provided, together with any additional relevant information. Signals are described from the perspective of the EDGE modem and Daughter Card circuitry. Consequently signals described as input are inputs to the modem, driven by the host [host⇒modem]. Likewise, signals described as output are driven by the modem in to the host [modem⇒host]. Bi-directional signal flow (I/O) is indicated by a double-headed arrow [modem⇔host]. In some instances the [daughter card] will be identified if the modem circuitry is not directly involved, or where additional interface circuitry resides between the host and the modem. Signals which are pulled internally are identified in parentheses beside the signal name as either (PU)=Pulled Up or (PD)=Pulled Down. Signals with no designation are not pulled either way. 5.1 Power Interfaces This section describes the power, ground, and other signals that control or indicate power states. • VIN • 3V3 • VREF • GND

Confidential INTERFACE DESCRIPT 20(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Note: Any hard copy of this document is for reference only. Due to template and application dependencies the header and footer may fail to display correct data. It is the responsibility of the user to ensure that they have a correct and valid version. Any outdated hard copy is invalid and must be removed from possible use. 5.1.1 VIN Function: Daughter card power supply Description: Primary voltage supply to switching regulator Pin Numbers: 14, 15, 16, 17, 18, 19 Signal Names: VIN [host⇒daughter card] If not used: Required Details: Power provided by the host will range from 5.5V minimum to a maximum 20.0V. The Daughter Card has on board regulation which regulates the supply range to a steady 3.6V by means of a switching regulator rated at 3A max. The supply voltage range for the monitor mount version, which includes the reservoir capacitor is 4.8V minimum to a maximum of 20.0V. Typical Electrical Characteristics: Parameter Condition Low Mid High Unit Voltage Min1 7.4 20.0 V Peak2 w/o reservoir capacitor GSM850 2-slot TX 1880 1500 <1000 Peak2 with reservoir capacitor GSM850 2-slot TX <1000 <1000 <1000 Transmit mode Power Consumption (worst case) average GSM850 2-slot TX 450 340 145 est mA Idle mode Power Consumption (worst case) average DRX 2 9.9 7.6 3.8 est mA 1. Min voltage for /2 and /21 variant is 5.5 V. Min voltage for /3 variant is 4.8 V. 2. Peak current consumption is an instantaneous value which occurs during a TDMA transmitter burst. Table 5.1-1: VIN Electrical Characteristics

Confidential INTERFACE DESCRIPT 21(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 5.1.2 3V3 Function: Daughter card reference voltage Description: Host reference to protection circuit & USB (3.3V) Pin Numbers: 21 Signal Names: 3V3 [host⇒daughter card] If not used: Required Details: The host supplies a 3.3V regulated supply to the Daughter Card for two primary functions : • reference supply for the undervoltage / short circuit protection circuitry • input for the USB interface Electrical Characteristics: Parameter Condition Min Nom Max Unit Voltage 3.30 V Ripple 100 mV 5.1.3 VREF Function: Voltage Reference Description: Core digital voltage reference from modem. Pin Number: 3 Signal Name: VREF [modem⇒host] If not used: Required Details: VREF is supplied as a reference voltage from the modem. This reference is the modem’s core digital supply voltage at a nominal 2.80V. The interface is capable of sourcing 200uA and is intended primarily for situations where host interface circuitry is required to be level shifted to maintain wireless modem signal level compatibility. If more current is required by the host, a current amplifier must be implemented.

Confidential INTERFACE DESCRIPT 22(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 This signal can also be used to indicate whether the wireless modem is powered on or not. A high level (2.7V to 2.9V) indicates that the modem is powered on. A low level (<0.5V) indicates that the modem is powered off. All digital logic, except the SIM interface, is characteristic CMOS logic operating at VREF. Electrical Characteristics: Parameter Condition Min Typ Max Unit inactive 0.3 0.5 V VREF output voltage active 2.70 2.80 2.90 V VREF output current IOUT 200 uA Table 5.1-2: VREF Electrical Characteristics 5.1.4 GND Function: Ground Description: Modem common rail Pin Numbers: 8, 9, 10, 11, 12, 13 Signal Name: GND If not used: Required Details: Return path for all currents.

Confidential INTERFACE DESCRIPT 23(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 5.2 Status Interfaces Status interfaces indicate or control status features of the modem. • UVP • OVP • RI • LED • VREF 5.2.1 UVP Function: Under voltage protection Description: Status indicator to host of potential malfunction in Daughter Card circuitry Pin Number: 23 Signal Name: UVP (PD) [daughter card⇒host] If not used: Required Details: The Daughter Card has FET circuitry which uses 3V3 as a reference, driving an output to the host indicating the voltage condition of the of VBAT (the modem supply voltage). A resistive divider connected to VBATT presents a very low Vbe to the UVP transistor. This presents a steady state low voltage output under normal VBAT conditions with external pulldown circuitry. In the event of a short circuit or high current fault condition on the Daughter Card, the voltage drop from the switching regulator will bias the UVP transistor on and present a high output to the host monitoring circuit. The UVP signal should be pulled low by the application circuit for correct function. Electrical Characteristics: Parameter Condition Min Typ Max Unit Normal 0.5 V UVP output voltage Fault 3.3 V Table 5.2-1: UVP Electrical Characteristics

Confidential INTERFACE DESCRIPT 24(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 5.2.2 OVP Function: Over voltage protection Description: Status indicator to host of potential malfunction in Daughter Card circuitry Pin Number: 4 Signal Name: OVP (PU) [daughter card⇒host] If not used: Required Details: The OVP signal is simply an output from the main onboard regulator. In it’s operational state under normal functional conditions this will output 3.6V nominal Parameter Condition Min Typ Max Unit Normal 3.6 V UVP output voltage Fault 3.7 V Table 5.2-2: OVP Electrical Characteristics 5.2.3 RI Function: Ring Indicator Description: Alert signal from the modem to indicate an incoming SMS, or unmasked unsolicited response Pin Number: 20 Signal Name: RI [modem⇒host] If not used: Leave open Details: Ring Indicator is essentially a wake-up call from the modem to the host application to signal one of two events: • an in-coming message (SMS). • an unmasked unsolicited response/result code. For the EDGE modem the Ring Indicator is implemented as a GPIO interface within the EDGE baseband device.

Confidential INTERFACE DESCRIPT 25(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 A falling edge indicates an alert or message. The signal remains low for a period of time before going high. An SMS-page or unsolicited response/result code generates one pulse (the length is configurable using an AT command)[TBC]. The ring indicator is implemented on the daughter card as an open collector transistor output to allow the host the convenience of driving Viao circuitry. 5.2.4 LED Function: LED Description: LED-signal indicating a status change Pin Number: 22 Signal Name: LED [modem⇒host] If not used: Leave open Details: The LED is implemented on the Daughter Card as an open collector transistor output which providesa driver level interface to an LED acting as a status indicator for the user. The LED output can be made to blink at a rate pre-determined by modem software. 5.2.5 VREF The function of VREF is already described in 5.1.3. This interface can be used as a status indicator to the host that the modem is still powered. VREF is present whilst the modem is powered and is removed upon the completion of the modem power down. This feature can be useful in the event of a communications lock-up between the host and the daughter card.

Confidential INTERFACE DESCRIPT 26(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 5.3 Data Communication and Control Interfaces The serial data and control interfaces consist of the following : • USB • P_EN 5.3.1 USB Interface Function: USB data communication port Description: USB transmit and receive port for data communication between modem and host. Pin Numbers: 1, 2 Signal Names: USB_DP (2) [modem⇔host] USB_DN (1) [modem⇔host] If not used: Required Details: The USB interface is designed to USB 1.1 specifications. Details of the specific function of the USB interface can be found in section 6.3. Power to the USB interface is provided by the 3V3 input from the host. 5.3.2 P_EN Function: Power Enable Description: Modem power enable control from host Pin Numbers: 24 Signal Names: P_EN [host⇒daughter card] If not used: Required Details: The power enable signal is provided from the host application and is routed to the switching regulator shutdown input and also to the REG_EN (regulator enable) pin on the modem. Assertion of this pin will initiate power up. The P_EN pin is active high and has to be maintained continually in order to keep the modem powered.

Confidential INTERFACE DESCRIPT 28(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 6 Rudimentary Circuit Functions This section contains some rudimentary circuit functions for the sequencing of powering the modem up and down. 6.1 Power On Sequence This sequence illustrates the power on procedure. Figure 6.1-1 Power On Sequence Sequence Detail: 1 VIN and 3V3 are supplied to the modem by the host. These two voltages can be supplied simultaneously when the Daughter Card is required to be powered on. Both voltages must be present before the power on sequence is initiated for the Daughter Card to function correctly. 2 Once VIN and 3V3 voltages are applied the host can enable power up by asserting power enable signal P_EN. The power up process will begin. 3 VREF may be used as an indicator that the modems regulators are powered. tPOn is typically less than 70 ms

Confidential INTERFACE DESCRIPT 29(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 6.2 Power Off Sequence This sequence illustrates the power off procedure. Figure 6.2-1 Power Off Sequence Sequence Detail: 1 The “AT+CFUN=4” instruction is sent from the host application to the modem in order to initiate a deregistration sequence. 2 The modem responds to the request with an ‘OK’ to indicate that deregistration is completed. Deregistration from the network can take from 3-30 seconds. After de-registration has been acknowledged the host application may remove P_EN. 3 The switching regulator output capacitor will gradually discharge until the modem regulators threshold is exceeded. and power down will be complete. VREF may be used as indicator of complete shut down. 4 When the modem has successful shutdown, and VREF has fallen bellow 0.5V then the host may safely remove VIN and 3V3 at any time. However the supplies can remain active without increasing current consumption (typically <25uA).

Confidential INTERFACE DESCRIPT 30(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 6.3 USB communications information This sequence illustrates USB initialization. 1. The startup sequence begins with the completion of the power up ramping of the VREF signal as described in Power On Sequence. 2. The D+ signal is brought high with the power up of the USB block in the baseband circuitry. This produces the J state indicating to the USB host that a device is attaching. 3. A host initiated SE0 begins the USB protocol transactions. USB enumeration information Using the supplied drivers, the Daughter Card will be identified as a USB peripheral with the following descriptor data: Device Descriptor: bcdUSB: 0x0110 bDeviceClass: 0x00 bDeviceSubClass: 0x00 bDeviceProtocol: 0x00 bMaxPacketSize0: 0x40 (64) idVendor: 0x0FCE idProduct: 0xD019 bcdDevice: 0x202 iManufacturer: 0x00 iProduct: 0x00 iSerialNumber: 0x00 bNumConfigurations: 0x01

Confidential INTERFACE DESCRIPT 31(31)Document number Revision 1/155 19-KRD 104 1025 Uen PA4 Eye Diagram for Full Speed USB signaling. The USB link runs at full-speed (12 Mbps). The following diagram is exhibited from compliance testing data.