Vbat Interface, Pin No Signal Name Description, Dce | Huawei MG323

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.

Image 17

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

Contents

Hardware Guide Issue Date No Warranty History About This DocumentVersion Date Chapter Descriptions Creation Version Date Chapter Descriptions Specifications of the antenna interface Updated .8 Audio InterfaceUpdated -3 Recommended Contents Electrical and Reliability Features Overview Introduction Overall Description Feature DescriptionAbout This Chapter Function Overview DRX=5 DRX=9 DRX=2SMS Gprs Gprs Class Circuit Block Diagram Application Block Diagram 2Circuit block diagram of the MG323 module Description of the Application Interfaces B2B Connector Interface Min Tpy Max Pin Pin Name Description DC Characteristics Normal Termon ResetUART1DCD Ledstatus Overview Power InterfaceVIO Vbat Vbat Interface Pin No Signal Name DescriptionGND Vcoin DCE VIO 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 Pins Working or Network Status Output Signal Control PinApplication Device Uart Interface Pin No Signal Name Description Feature Direction DCE 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 Ready Power supply of the SIM card Clock signal of the SIM cardData signal of the SIM card Reset signal of the SIM card Circuit Recommended for the SIM Card Interface Ground signal of the SIM card Audio Interface 12External circuit for 32 Ω handsets/16 Ω headsets 13External circuit for the microphone interface Antenna Interface Antenna Installation Environmental Type Material Condition Coaxial Cable and RF Connector Huawei 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 MHz Specification Minimum Typical Maximum Unit Value Polarization Linear polarization Pattern Omnidirectional Specifications of the Antenna Interface Symbol Specification Minimum Value Maximum Value Unit Electrical and Reliability FeaturesExternal power voltage Extreme Working Conditions Specification Minimum Value Maximum Value Unit Operating and Storage Temperatures and HumidityPin No Signal Name Electrical Criteria of Application Interfaces Power supply Function Signal Name Waveform Remarks LevelVoltage great drop. The Vbat power voltage Than 3.3 Power pin Pins 41, 43, 45, 47, and 49 are power GND ExternalVBAT=0 Ledstatu UART1DSR UART1RTS UART1DTR UART1CTS UART1DCD UART1 UART1RDUART1RIN Input Power Supply Power Supply FeaturesWorking Current Parameter Minimum Value Typical Value Maximum Value Unit Band Typical Unit Working Mode Typical value Unit RemarkConfiguration Configuration Value Reliability FeaturesUp/1 Down 123 Test Condition Standard Test 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 Connector Model Stacking HRS Number Height mm 5Structure fixing hole MG323 Module Installation Description 6MG323 module installation 7Machine screw dimensions Specification Selection for Fasteners 8Nut dimensions 1Circuits of typical interfaces in the MG323 module Appendix a Circuits of Typical Interfaces Acronym or Abbreviation Expansion Appendix B Acronyms and Abbreviations PCB PbcchPDU RTC