0
V
Off
Switching
Supply
in
the
modem
that
powers
up
the
Huawei
module.
6
USB
D+
I/O
‐
This
connects
to
the
Huawei
module.
7
VIN
I/O
Input
mode:
4.7
V
–
60
V
Output
mode:
Power
jack
input
voltage
If
using
the
modem’s
power
jack,
header
VIN
is
in
output
mode.
When
not
using
an
external
power
cube,
VIN
is
in
input
mode.
See
Power
Lines
below
for
details.
8
POWER_ON_OFF_NOT
I
1.8V
to
7V
High
0
V
to
.6V
Low
This
signal
reaches
the
Huawei
609
through
an
inverter.
See
Huawei
Hardware
Guide.
9
GPIO2
I/O
This
I/O
line
goes
directly
to
the
Huawei
GPIO2
line.
See
Huawei
Hardware
Guide.
10
GPIO1
I/O
This
I/O
line
goes
directly
to
the
Huawei
GPIO1
line.
See
Huawei
Hardware
Guide.
11
WAKEUP_IN_NOT
I
1.8V
to
7V
High
0V
to
.6V
Low
This
signal
reaches
the
Huawei
609
through
an
inverter.
See
Huawei
Hardware
Guide.
12
WAKEUP_OUT_NOT
O
High
impedance
is
normal
0
V
Low
Output
is
open
‐
drain
output
of
N
‐
channel
Mosfet
inverter.
Pull
this
up
to
your
logic’s
supply
voltage
to
use
this
line.
When
0
volts,
Huawei
Wakeup_Out
is
High..
13
Ground
14
N/C
Nothing
connects
to
this
line.
15
N/C
Nothing
connects
to
this
line.
16
N/C
Nothing
connects
to
this
line.
17
N/C
Nothing
connects
to
this
line.
18
VMID
O
1.8
V
19
N/C
Nothing
connects
to
this
line.
20
SLEEP_STATUS_NOT
0
High
impedance
Is
normal
0
V
Low
Output
is
open
‐
drain
output
of
N
‐
channel
Mosfet
inverter.
Pull
this
up
to
your
logic’s
supply
voltage
to
use
this
line.
When
0
volts,
Huawei
Sleep_Status
is
High.
21
GPIO4
I/O
1.8
V
On
0
V
Off
This
I/O
line
goes
directly
to
the
Huawei
GPIO4
line.
See
Huawei
Hardware
Guide.
46
