Sony Ericsson Dual SIM connection Application Note
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Sony Ericsson Dual SIM connection Application Note

Sony Ericsson Dual SIM connection Application Note

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Application Note
Dual SIM connection

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Summary of Contents for Sony Ericsson Dual SIM connection

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

  • Page 4: Design Overview

    This application note provides the design of one such “Dual SIM” system when used in conjunction with a GR47 GSM module from Sony Ericsson. Design Overview The SIM connection signals from the GR47 GSM module consist of:...
  • Page 5 Dual SIM connection 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 82kΩ on 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.
  • Page 6 Dual SIM connection 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.
  • Page 7 Dual SIM connection APPENDIX SIMCLK SIMRST SIMVCC 1µF 100n 100n 82kΩ 82kΩ SIMDATA GR47 NLAS325 SIM1 SIM2 100n HIGH = SIM1 COM1 SIMSELECT COM2 LOW = SIM2 Figure 1. Dual SIM schematic LZT 123 7676 R1A...

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