Sony Ericsson Dual SIM connection Application Note Download Page 3

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Dual SIM connection

LZT 123 7676 R1A

Contents

INTRODUCTION.................................................................................................................... 4

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

OPERATION.......................................................................................................................... 6

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

Summary of Contents for Dual SIM connection

Page 1: ...Application Note Dual SIM connection...

Page 2: ...ay 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 Ericsso...

Page 3: ...Dual SIM connection LZT 123 7676 R1A 3 Contents 1 INTRODUCTION 4 2 DESIGN OVERVIEW 4 3 OPERATION 6 APPENDIX 7...

Page 4: ...IM 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...

Page 5: ...AT2 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...

Page 6: ...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 u...

Page 7: ...A 7 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 82k 82k 100n SI...