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