Huawei MG323 manual Vbat Interface, Pin No Signal Name Description, GND Vcoin, Dce

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HUAWEI MG323 GSM M2M Module
Hardware Guide			Description of the Application Interfaces
Table 3-2Definitions of the pins on the power supply interface

	Pin No.	Signal Name	I/O	Description

	42, 44, 46, 48, 50	VBAT	P	Pins for Power supply input

	41, 43, 45, 47, 49	GND	-	GND

	35	VCOIN	P	Pin for standby power input of
				the RTC

	40	VIO	P	Pin for external power output

3.3.2VBAT Interface

When the MG323 module works normally, power is supplied through the VBAT pins and the voltage ranges from 3.3 V to 4.8 V (typical value: 3.8 V). The 50-pin B2B connector provides five VBAT pins and five GND pins for external power input. To ensure that the MG323 module works normally, all the pins must be used efficiently.

When the MG323 module is used for different external applications, pay special attention to the design for the power supply. When the MG323 module transmits signals at the maximum power, the transient current may reach the transient peak value of about 2.0 A due to the differences in actual network environments. In this case, the VBAT voltage greatly drops. Make sure that the voltage does not decrease below 3.3 V in any case. Otherwise, exceptions such as restart of the MG323 module may occur.

A low-dropout (LDO) regulator or switch power with current output of more than 2 A is recommended for external power supply. Furthermore, At least five 220 µF storage capacitors should be connected in parallel at the power interface of the MG323 module. In addition, to reduce the impact of channel impedance on voltage drop, you are recommended to try to shorten the power supply circuit of the VBAT interface.

It is recommended to employ a ferrite bead in series on VBAT power circuit to improve the EMI performance. And the rated current of the ferrite bead is required at least 2 A.

Figure 3-2shows the recommended power circuit of MG323 module.

Figure 3-2Recommended power circuit of MG323 module

Module

(DCE)

VBAT

10 μF 100 nF

VBAT

+

+

+

+

+

220 μF 220 μF 220 μF 220 μF 220 μF

	Issue 06 (2013-06-13)	Huawei Proprietary and Confidential	17
		Copyright © Huawei Technologies Co., Ltd.

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Contents Hardware Guide Issue DateNo Warranty History About This DocumentVersion Date Chapter Descriptions CreationVersion Date Chapter Descriptions Specifications of the antenna interface Updated .8 Audio InterfaceUpdated -3 Recommended Contents Electrical and Reliability Features Overview IntroductionOverall Description Feature DescriptionAbout This Chapter Function OverviewDRX=5 DRX=9 DRX=2SMS Gprs Gprs ClassCircuit Block Diagram Application Block Diagram2Circuit block diagram of the MG323 module Description of the Application Interfaces B2B Connector InterfaceMin Tpy Max Pin Pin Name Description DC Characteristics NormalTermon ResetUART1DCD LedstatusOverview Power InterfaceVIO VbatVbat Interface Pin No Signal Name DescriptionGND Vcoin DCEVIO Interface Power-On and Power-Off Time SequenceVcoin Interface Pin for resetting the hardware Power-On Time SequencePin for controlling power-on and power-off Reset Signal Control InterfacePower-Off Time Sequence Pin for network status LED Input Signal Control PinsWorking or Network Status Output Signal Control PinApplication Device Uart Interface Pin No Signal Name Description Feature DirectionDCE receive DTE transmits DTE to DCE Data Serial data Circuit Recommended for the Uart InterfaceDCE data DTE is ready DTE to DCE Terminal ready DCE data set DCE is ready DCE to DTE ReadyPower supply of the SIM card Clock signal of the SIM cardData signal of the SIM card Reset signal of the SIM cardCircuit Recommended for the SIM Card Interface Ground signal of the SIM cardAudio Interface 12External circuit for 32 Ω handsets/16 Ω headsets13External circuit for the microphone interface Antenna Interface Antenna InstallationEnvironmental Type Material Condition Coaxial Cable and RF ConnectorHuawei MG323 GSM M2M Module Hardware Guide Antenna Interface Specification Minimum Typical Maximum Unit Value RF Specifications of the Antenna InterfaceESD Protection for the Antenna Interface Uplink frequency range GSM 824 849 MHzSpecification Minimum Typical Maximum Unit Value Polarization Linear polarization Pattern Omnidirectional Specifications of the Antenna InterfaceSymbol Specification Minimum Value Maximum Value Unit Electrical and Reliability FeaturesExternal power voltage Extreme Working ConditionsSpecification Minimum Value Maximum Value Unit Operating and Storage Temperatures and HumidityPin No Signal Name Electrical Criteria of Application InterfacesPower supply Function Signal Name Waveform Remarks LevelVoltage great drop. The Vbat power voltage Than 3.3Power pin Pins 41, 43, 45, 47, and 49 are power GND ExternalVBAT=0 LedstatuUART1DSR UART1RTS UART1DTR UART1CTS UART1DCD UART1 UART1RDUART1RIN Input Power Supply Power Supply FeaturesWorking Current Parameter Minimum Value Typical Value Maximum Value UnitBand Typical Unit Working Mode Typical value Unit RemarkConfiguration Configuration Value Reliability FeaturesUp/1 Down 123 Test Condition StandardTest Condition Standard EN61000-4-2 ±4 kV ±8 kV ESD FeaturesESD Test Standard Contact Discharge Air Discharge Dimensions L x W x H 35 mm x 32.5 mm x 3.05 mm Mechanical SpecificationsDimensions 1Dimensions of the MG323 module unit mm Dimensions of the B2B ConnectorModel Stacking HRS Number Height mm 5Structure fixing hole MG323 Module Installation Description6MG323 module installation 7Machine screw dimensions Specification Selection for Fasteners8Nut dimensions 1Circuits of typical interfaces in the MG323 module Appendix a Circuits of Typical InterfacesAcronym or Abbreviation Expansion Appendix B Acronyms and AbbreviationsPCB PbcchPDU RTC

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