your position is our focus
Function
PIN
(LEA)
I/O
Description
Remarks
Serial Port /USB
The
serial
output
voltage
levels
on
Tx
depend
on
the
applied
VDDIO
voltage
level.
TxD1
3
O
Serial
Port
1
VDDIO
serial
port
output.
Leave
open
if
not
used.
RxD1
4
I
Serial
Port
1
if
not
used.
Note
Don’t
use
an
external
pull
up
resistor.
5V
tolerant
serial
port
input
with
internal
pull-up
resistor
to
V_BAT
.
Leave
open
Tx 2
D
1
O
Serial
Port
2
LEA-4A / LEA-4S / LEA-4M
(only)
:
VDDIO
serial
port
output.
Leave
open
if
not
used.
LEA-4A / LEA-4S / LEA-4M
(only):
RxD2
2
I
Serial
Port
2
if
not
used.
5V
tolerant
serial
port
input
with
internal
pull-up
resistor
to
V_BAT
.
Leave
open
Note
Don’t
use
an
external
pull
up
resistor.
USB_DM
25
USB_DP
26
I/O
USB
I/O
line
USB1.1
bidirectional
communication
pin.
To
be
fully
compliant
with
USB
standard
follow
the
schematic
recommendation
in
Section 4.4.2.
System
BOOT_INT
12
I
Boot
mode
Do
not
connect
on
LEA-4A
, LEA-4M
and
LEA-4S
receivers.
RESET_N
10
I
Hardware
Reset
(Active
Low)
Leave
open
if
not
used.
Do
not
drive
high.
See
also
Section 4.9.2
.
TIMEPULSE
28
O
Timepulse
Signal
Configurable
Timepulse
signal
(one
pulse
per
second
by
default).
Leave
open
if
not
used.
See
also
Section 4.7.1
.
EXTINT0
27
External
Interrupt
External
Interrupt
Pin
to
wake
up
receiver
in
FixNOW™
sleep
mode.
See
also
Section 4.2.7.1
and
4.9.4
for
further
information.
Internal
pull-up
resistor
to
V_BAT
.
Leave
open
if
not
used.
GPSMODE6/
PCS0_N/ SS_N/
P26
9
I/O
GPSMODE5/
EXTINT1/ P13
21
I/O
GPSMODE23
GPSMODE2/
PCS2_N/P12
22
I/O
GPIO/
GPSMODE
Pin
LEA-4A/ LEA-4S/ LEA-4M:
GPSMODE
Pin;
leave
open
if
default
configuration
is
used.
Refer
to
Section
4.8.2
for
further
information
LEA-4P / LEA-4H/ LEA-4T:
GPIO
Pin;
leave
open
if
not
used
The
General
Purpose
I/O
(GPIO)
can
only
be
programmed
with
the
ANTARIS
®
4
Software
Customization
Kit,
please
refer
to
the
SCK Manual [8]
when
intending
to
use
of
the
GPIO’s
of
the
receiver.
GPSMODE7/
Connect
SCK/ P23
23
I/O
USB
Boot
time
configuration
pin
LEA-4A/ LEA-4S / LEA-4M:
Defines
the
Power
Supply
mode
of
the
GPS
module.
GPSMODE7
=high
(default)
means
that
the
module
has
it’s
own
power
supply.
GPSMODE7
=low
means
that
the
GPS
module
is
powered
by
the
USB
bus.
to
GND
,
when
Bus
Powered
Mode
is
required.
Otherwise
leave
open.
For
details
about
configuration
settings
refer
to
Section 4.8.2
.
LEA-4H/ LEA-4T:
leave
open
if
not
used
The
General
Purpose
I/O
(GPIO)
can
only
be
programmed
with
the
ANTARIS
®
4
fer
to
the SCK Manual [8]
when
intending
LEA-4P /
GPIO
Pin;
Software
Customization
Kit,
please
re
to
use
of
the
GPIO’s
of
the
receiver.
MOSI/ P24
1
I/O
MSIO/ P25
2
I/O
GPIO
LEA-4H / TIM-4P
(only)
:
GPIO
Pin;
leave
open
if
not
used
Note
Used
as
RxD2/ TxD2
on
LEA-4A
/
LEA-4S/
LEA-4M
receivers.
Table 5: Pinnout LEA-4x
3
Used
as
MOSI
/
MISO
/
GPIO
pins
on
LEA-4H,
LEA-4P
and
LEA-4T
receivers.
4
Connecting
theGPSMODE23
pin
(LEA-4S)
to
GND
increases
the
FixNOW
sleep
mode
current
by
about
50µA.
Connecting
the
GPSMODE2
pin
(LEA-4A
to
GND
does
however
not
have
an
impact
on
the
FixNOW
sleep
mode
current.
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Design-In
GPS.G4-MS4-05007-A1
Page 46
