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HUAWEI MG323 GSM M2M Module
Hardware Guide
Contents
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
4
Contents
1 Introduction.................................................................................................................................... 6
1.1 Overview .......................................................................................................................................... 6
2 Overall Description ...................................................................................................................... 7
2.1 About This Chapter ........................................................................................................................... 7
2.2 Function Overview ........................................................................................................................... 7
2.3 Application Block Diagram ............................................................................................................... 9
2.4 Circuit Block Diagram ....................................................................................................................... 9
3 Description of the Application Interfaces .............................................................................. 11
3.1 About This Chapter .......................................................................................................................... 11
3.2 B2B Connector Interface ................................................................................................................. 11
3.3 Power Interface .............................................................................................................................. 13
3.3.1 Overview ................................................................................................................................ 13
3.3.2 VBAT Interface ....................................................................................................................... 13
3.3.3 VCOIN Interface .................................................................................................................... 14
3.3.4 VIO Interface ......................................................................................................................... 14
3.4 Power-On and Power-Off Time Sequence ..................................................................................... 15
3.4.1 Overview ................................................................................................................................ 15
3.4.2 Power-On Time Sequence .................................................................................................... 15
3.4.3 Power-Off Time Sequence .................................................................................................... 16
3.4.4 RESET ................................................................................................................................... 16
3.5 Signal Control Interface .................................................................................................................. 17
3.5.1 Overview ................................................................................................................................ 17
3.5.2 Input Signal Control Pins ....................................................................................................... 17
3.5.3 Output Signal Control Pin ...................................................................................................... 18
3.6 UART Interface ............................................................................................................................... 19
3.6.1 Overview ................................................................................................................................ 19
3.6.2 Circuit Recommended for the UART Interface ...................................................................... 20
3.7 SIM Card Interface ......................................................................................................................... 22
3.7.1 Overview ................................................................................................................................ 22
3.7.2 Circuit Recommended for the SIM Card Interface ................................................................ 22
3.7.3 ESD Protection for the SIM Card Interface ........................................................................... 23
3.8 Audio Interface ............................................................................................................................... 24