13External circuit for the microphone interface | Huawei MG323

HUAWEI MG323 GSM M2M Module
Hardware Guide	Description of the Application Interfaces

33 pF capacitors are added for filtering radio frequency interference.

Figure 3-13External circuit for the microphone interface

33 pF capacitors are added for filtering radio frequency interference.

It is recommended that ESD components be added to the external circuit of the audio interface to protect the module.

	Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	28
		Copyright © Huawei Technologies Co., Ltd.

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Huawei MG323 manual 13External circuit for the microphone interface

Contents

Issue Date Hardware Guide No Warranty About This Document HistoryVersion Date Chapter Descriptions Creation Version Date Chapter Descriptions Updated -3 Recommended Updated .8 Audio InterfaceSpecifications of the antenna interface Contents Electrical and Reliability Features Introduction Overview Feature Description Overall DescriptionAbout This Chapter Function Overview DRX=2 DRX=5 DRX=9SMS Gprs Gprs Class Application Block Diagram Circuit Block Diagram 2Circuit block diagram of the MG323 module B2B Connector Interface Description of the Application Interfaces Pin Pin Name Description DC Characteristics Normal Min Tpy Max Reset TermonUART1DCD Ledstatus Power Interface OverviewVIO Vbat Pin No Signal Name Description Vbat InterfaceGND Vcoin DCE Vcoin Interface Power-On and Power-Off Time SequenceVIO Interface Pin for controlling power-on and power-off Power-On Time SequencePin for resetting the hardware Power-Off Time Sequence Signal Control InterfaceReset Input Signal Control Pins Pin for network status LED Application Device Output Signal Control PinWorking or Network Status Pin No Signal Name Description Feature Direction Uart Interface Circuit Recommended for the Uart Interface DCE receive DTE transmits DTE to DCE Data Serial dataDCE data DTE is ready DTE to DCE Terminal ready DCE data set DCE is ready DCE to DTE Ready Clock signal of the SIM card Power supply of the SIM cardData signal of the SIM card Reset signal of the SIM card Ground signal of the SIM card Circuit Recommended for the SIM Card Interface 12External circuit for 32 Ω handsets/16 Ω headsets Audio Interface 13External circuit for the microphone interface Antenna Installation Antenna Interface Coaxial Cable and RF Connector Environmental Type Material Condition Huawei MG323 GSM M2M Module Hardware Guide Antenna Interface RF Specifications of the Antenna Interface Specification Minimum Typical Maximum Unit ValueESD Protection for the Antenna Interface Uplink frequency range GSM 824 849 MHz Specification Minimum Typical Maximum Unit Value Specifications of the Antenna Interface Polarization Linear polarization Pattern Omnidirectional Electrical and Reliability Features Symbol Specification Minimum Value Maximum Value UnitExternal power voltage Extreme Working Conditions Operating and Storage Temperatures and Humidity Specification Minimum Value Maximum Value UnitPin No Signal Name Electrical Criteria of Application Interfaces Function Signal Name Waveform Remarks Level Power supplyVoltage great drop. The Vbat power voltage Than 3.3 Pins 41, 43, 45, 47, and 49 are power GND External Power pinVBAT=0 Ledstatu UART1RIN UART1 UART1RDUART1DSR UART1RTS UART1DTR UART1CTS UART1DCD Power Supply Features Input Power SupplyWorking Current Parameter Minimum Value Typical Value Maximum Value Unit Configuration Working Mode Typical value Unit RemarkBand Typical Unit Reliability Features Configuration ValueUp/1 Down 123 Test Condition Standard Test Condition Standard ESD Test Standard Contact Discharge Air Discharge ESD FeaturesEN61000-4-2 ±4 kV ±8 kV Dimensions Mechanical SpecificationsDimensions L x W x H 35 mm x 32.5 mm x 3.05 mm Dimensions of the B2B Connector 1Dimensions of the MG323 module unit mm Model Stacking HRS Number Height mm MG323 Module Installation Description 5Structure fixing hole 6MG323 module installation Specification Selection for Fasteners 7Machine screw dimensions 8Nut dimensions Appendix a Circuits of Typical Interfaces 1Circuits of typical interfaces in the MG323 module Appendix B Acronyms and Abbreviations Acronym or Abbreviation Expansion Pbcch PCBPDU RTC