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HUAWEI MG323 GSM M2M Module
Hardware Guide
Function
Signal Name I/O Waveform and
BATT_
THERM
External
VIO
power voltage
interface
Interface for
VCOIN
standby
power input of
the RTC
Power pin
TERM_ON
Reset pin
RESET
Signal of the
LED_STATU
network
S
status LED
SIM card
SIM_RST
interface
SIM_DATA
(assuming the
voltage is 3.0
SIM_CLK
Issue 04 (2011-08-22)
Level
I
P
V
= 2.70 V
omin
V
= 2.80 V
otype
V
= 2.95 V
omax
I
= 10.00 mA
omax
P
V
= 3.00 V
omax
V
= 2.00 V
Imin
V
= 3.00 V
Itype
V
= 3.15 V
Imax
= 5.00 μA at
I
Itype
VBAT = 0 V
I
V
= 0.40 V
ILmax
The signal
can be
detected when
low level keeps
effective for one
second or more.
I
V
= 0.40 V
ILmax
The signal
can be
detected when
low level keeps
effective for 10
milliseconds or
more.
O
V
= 2.70 V
oHmin
O
I/O
O
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Electrical and Reliability Features
Remarks
Pin 23 is used to check the battery
temperature through a negative temperature
coefficient (NTC) resistor.
This pin can be left floating if it is not used.
Pin 40 is a pin for supplying external devices
with power from the MG323 module. Ensure
that the external peaks and burst do not
damage the VIO interface.
If the MG323 module is in Sleep mode, the
VIO pin is in the enabled low consumption
state (< 500 uA). If the MG323 module is in
Power Down mode, the VIO pin is in the
disabled state.
This pin can be left floating if it is not used.
Pin 35 is a pin for standby power input of the
RTC. When the VBAT is not ready for power
supply, the RTC can be supplied with power
through an external coin battery or capacitor.
This pin can be left floating if it is not used.
Pin 20 is a pin for powering on the module.
Low level is effective.
Pin 22 is a pin for restarting the module. Low
level is effective.
This pin can be left floating if it is not used.
Pin 25 is a pin for controlling the network
status LED.
This pin can be left floating if it is not used.
Reset signal of the SIM card
Data signal of the SIM card
Clock signal of the SIM card
36
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