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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.
36
Function
Signal Name
I/O
Waveform and
Level
Remarks
BATT_
THERM
I
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.
External
power voltage
interface
VIO
P
V
omin
= 2.70 V
V
otype
= 2.80 V
V
omax
= 2.95 V
I
omax
= 10.00 mA
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.
Interface for
standby
power input of
the RTC
VCOIN
P
V
omax
= 3.00 V
V
Imin
= 2.00 V
V
Itype
= 3.00 V
V
Imax
= 3.15 V
I
Itype
= 5.00 μA at
VBAT = 0 V
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.
Power pin
TERM_ON
I
V
ILmax
= 0.40 V
The signal
can be
detected when
low level keeps
effective for one
second or more.
Pin 20 is a pin for powering on the module.
Low level is effective.
Reset pin
RESET
I
V
ILmax
= 0.40 V
The signal
can be
detected when
low level keeps
effective for 10
milliseconds or
more.
Pin 22 is a pin for restarting the module. Low
level is effective.
This pin can be left floating if it is not used.
Signal of the
network
status LED
LED_STATU
S
O
V
oHmin
= 2.70 V
Pin 25 is a pin for controlling the network
status LED.
This pin can be left floating if it is not used.
SIM card
interface
(assuming the
voltage is 3.0
SIM_RST
O
Reset signal of the SIM card
SIM_DATA
I/O
Data signal of the SIM card
SIM_CLK
O
Clock signal of the SIM card