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HUAWEI MG323 GSM M2M Module
Hardware Guide
Function
Signal Name I/O Waveform and
V)
VSIM
GND
SIM card
SIM_RST
interface
SIM_DATA
(assuming the
voltage is 1.8
SIM_CLK
V)
VSIM
GND
UART1
UART1_RD
communicatio
UART1_TD
n interface
UART1_RIN
G
UART1_DSR O
UART1_RTS I
UART1_DTR I
UART1_CTS O
UART1_DCD O
Analog audio
EXTMIC_N
interface
EXTMIC_P
INTMIC_P
INTMIC_N
EXTEAR_N
EXTEAR_P
INTEAR_P
Issue 04 (2011-08-22)
Level
P
V
= 3.00 V
oHmax
V
= 2.90 V
otype
V
= 2.75 V
oHmin
V
= 1.95 V
oHmax
V
= 1.80 V
otype
V
= 1.65 V
oHmin
O
V
= 0.10 V
oLmax
V
= 2.70 V
oHmin
I
O
V
= 0.40 V
ILmax
V
= 2.40 V
IHmin
V
= 3.30 V
IHmax
AI
AI
AI
AI
AO
AO
AO
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Electrical and Reliability Features
Remarks
Power voltage of the SIM card
GND of the SIM card
Reset signal of the SIM card
Data signal of the SIM card
Clock signal of the SIM card
Power voltage of the SIM card
GND of the SIM card
This interface can be used to transmit AT
commands and data.
Negative end of differential headset MIC input
through channel 2
Positive end of differential headset MIC input
through channel 2
Positive end of differential handset MIC input
through channel 1
Negative end of differential handset MIC input
through channel 1
Negative end of differential speaker output
through channel 2
Positive end of differential speaker output
through channel 2
Positive end of differential speaker audio
output through channel 1
37
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