Sony Ericsson Dual SIM connection Instrucciones de instalación y funcionamiento

Application Note

Dual SIM connection

The product described in this manual conforms to the TTE directive 91/263/EEC and EMC directive

89/336/EEC. The product fulfils the requirements according to ETS 300 342-1.

The information contained in this document is the proprietary information of Sony Ericsson Mobile

Communications. 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, 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, the copyright holder.

First edition (August 2003)

Sony Ericsson Mobile Communications. publishes this manual without making any warranty as to the

content contained herein. Further Sony Ericsson Mobile Communications. reserves the right to make

modifications, additions and deletions to this manual 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 manual.

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LZT 123 7676 R1A 3

Contents

1INTRODUCTION....................................................................................................................4

2DESIGN OVERVIEW ............................................................................................................. 4

3OPERATION.......................................................................................................................... 6

APPENDIX .................................................................................................................................... 7

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1 Introduction

The SIM card provides the identity of a particular subscriber to the GSM

operator network. The network operator provides a set of services to the

subscriber based on his/her identity.

As a result of the varying costs, services, and cell coverage of different

GSM operators it may be beneficial to have a choice of GSM operator

network at the time of making or receiving a call. This can be achieved in

a system which actively selects which one of two SIM cards to activate

before attaching to a network.

This application note provides the design of one such “Dual SIM” system

when used in conjunction with a GR47 GSM module from Sony Ericsson.

2 Design Overview

The SIM connection signals from the GR47 GSM module consist of:

SIGNAL DESCRIPTION

SIMVCC 3V or 5V Supply

GND System Ground

SIMCLK Synchronous Clock Output

SIMRST Reset Output

SIMDATA SIM Data Input/Output

SIMPRESENCE SIM Presence Detection Input

Each of the output signals and the supply connections can be connected

directly to both SIM holders. With a little signal conditioning these signals

have enough drive to fan out to two SIM holders without need for signal

buffering. For signal conditioning each SIM holder has a supply

decoupling capacitor associated with it.

The SIMDATA data input/output signal is the key to successful SIM

access. When active, the SIMDATA signal is pulled-up by the GR47. The

signal is bidirectional and is pulled-down by whichever side is sending

data. In the case of the disabled SIM holder in our dual SIM solution the

unused SIMDATA must be pulled-up to SIMVCC. This is a standard idle

condition for a SIM.

The method we have used to redirect the SIMDATA signal to whichever

SIM has been actively selected is by a dual SPST analogue switch.

The dual SPST analogue switch is part number NLAS325 from “ON

Semiconductor™”. This part has a wide operating voltage range and very

low quiescent supply current. In addition it has two independent switch

enable controls, ideally suited to this application as one is active high, the

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other active low, which permit a single control signal to select either SIM1

or SIM2 without additional logic circuitry.

The pull-up resistor value of 82kΩon SIMDAT1 and SIMDAT2 not only

achieves the idle state pull-up but also compensates for the insertion of

the analogue switch into the SIMDATA signal.

Note : Due to the relatively high resistance of the pull-up on SIM Data

signals, the capacitance of the SIM Data line must be kept as low as

possible. Typically SIM circuits will not pass Type-Approval testing if the

SIM Data signal has a capacitive load greater than a few picoFarads.

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3 Operation

The operation of the dual SIM solution presented has been tested on

Type Approval Test equipment and has passed all electrical test

requirements with either SIM holder activated.

The selection of SIM1 or SIM2 was performed by mechanical switch

connecting IN1/IN2 to a pull-up resistor or SIMGND respectively.

The SIMPRESENCE detection input to the module can be used to trigger

a network-detach. A new network connection will be made when the

SIMPRESENCE signal is reactivated.

Note : It is not possible with this solution to receive calls on the SIM card

which is not activated.

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APPENDIX

Figure 1. Dual SIM schematic

VCC

RST

CLK

GND

VPP

DAT

SIMCLK

SIMRST

SIMVCC

GND

SIMDATA

VCC

RST

CLK

GND

VPP

DAT

VCC

GND

COM1

COM2

NO1

NC2

IN1

IN2

HIGH = SIM1

LOW = SIM2

SIMSELECT

82kΩ82kΩ

100n

SIM1 SIM2

100n

GR47 NLAS325

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