your position is our focus
4.4.1.3 SPI
Interface
The
standard
software
does
not
support
the
SPI
interface.
SPI
is
only
used
on
LEA-4R/TIM-4R
for
connecting
the
external
sensors.
It
is
also
used
to
connect
an
optional
EEPROM
to
NEO-4S
for
permanently
saving
of
configuration
changes.
4.4.2 U
rt
-4x
SB Serial Po (LEA
and NEO-4S)
A
A-4x
d
NEO
atur
rt.
It
is
e
UART
serial
ports
and
can
b
no
unication,
b
r
T
llow
figuration
gs
ar
FG
onfig)
–
USB
(Universal
Serial
Bus)
ll
LE
receivers
an
-4S
fe
e
one
USB
serial
po
an
alternative
to
th
e
used
t
only
for
comm
ut
also
to
power
the
GPS eceiver.
he
fo
ing
con
settin
e
supported
in
UBX
–
C
(C
Parameter
Description
Power M
Defi
Devices
dr
(bus
pow
er
it
h
ply
(self
powered
mod
ode
nes
whether
the
aws
power
over
the
USB
power
line
ered
mode)
or
wheth
as
it’s
own
power
sup
e).
Automatic reconnection
This
flag
will
automatically
initiate
a
disconnect-reconnection
cycle
to
update
the
USB
device
information
in
the
PC’s
USB
port
manager.
hen
changing
any
vendor-,
product
information
or
serial
number
Windows
would
immediately
require
the
matching
driver
files.
Note
W
Table 23: USB Configuration Parameter
Note
When
using
USB
port
together
with
FixNOW
Power
saving
Mode,
choose
Backup
Mode
rather
than
de
as
Power
Saving
Mode.
Sleep
Mo
The
USB
interface
supports
two
different
power
modes.
In
the
‘Self
Powered
Mode’
the
receiver
is
powered
by
its
own
power
supply.
VDDUSB
is
used
to
detect
the
availability
of
USB
port.
USB
connector
USB port (optional)
27R
27R
LDO
3V
USB_DP
ANTARIS
®
4
GPS
module
V
USB
USB
DM
USB
DP
VDDUSB
USB_DM
GPSMODE7
VCC
V
CC
GND
Figure 68: Self Powered USB Mode Schematic
In
the
‘Bus
powered
mode’
no
power
supply
for
the
GPS
receivers
is
available.
The
USB
bus
supplies
power
up
to
00mA.
To
achieve
a
constant
VCC
a
LDO
is
a
requirement.
1
USB_DP
VDDUSB
USB_DM
ANTARIS
®
4
GPS
module
GPSMODE7
USB
connector
USB port (optional)
27R
27R
LDO
3V
V
USB
USB
DM
USB
DP
VCC
GND
Figure 69: Bus Powered USB Mode Schematic
If
USB
serial
port
is
not
used
connect
VDDUSB
to
GND
and
leave
GPSMODE7
,
USB_DM
and
USB_DP
open.
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Receiver
Description
GPS.G4-MS4-05007-A1
Page 81
