NEO-5
-
Hardware
Integration
Manual
Preliminary
Design-In
GPS.G5-MS5-08003-A2
u-blox
proprietary
Page 11
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2.1.1.3
VDD_USB - USB Interface Power Supply
VDD_USB
supplies
the
I/Os
of
the
USB
interface.
If
the
USB
interface
is
not
used,
the
VDD_USB
pin
must
be
connected
to
GND.
For
more
information
regarding
the
correct
handling
of
VDD_USB
see
section
2.1.2 Power
Modes
u-blox
5
technology
offers
power-optimized
architecture
with
built-in
autonomous
power
saving
functions.
The
receiver
uses
Autonomous
Power
Management
to
minimize
the
power
consumption
at
any
given
time.
Furthermore,
the
software
shuts
down
the
clock
supply
to
unused
peripheral
on-chip
blocks.
2.1.3 Active Antenna Supply
With
NEO-5
modules
active
antennas
are
supplied
via
an
external
coil
or
circuit.
See
Section
for
more
information.
2.2 System Functions
2.2.1 EXTINT - External Interrupt Pin
EXTINT0
is
an
external
interrupt
pin.
It
will
be
used
in
future
NEO-5
releases
for
wake-up
functions
in
low-power
modes.
2.2.2 System
Monitoring
The
u-blox
-
5
GPS
and
GALILEO
Receiver
provides
System
Monitoring
functions
that
allow
the
operation
of
the
embedded
processor
and
associated
peripherals
to
be
supervised.
These
System
Monitoring
functions
are
being
output
as
part
of
the
UBX
protocol,
class
‘MON’.
Please
refer
to
the
u-blox 5
Protocol Specification
For
more
information
on
UBX
messages,
serial
interfaces
for
design
analysis
and
individual
system
monitoring
functions.
2.3 Interfaces
2.3.1 Serial
UART
1
(
RxD1
/
TxD1
)
is
the
default
serial
interface.
It
supports
data
rates
from
4.8
kBit/s
to
115
kBit/s.
The
signal
levels
are
CMOS
0
V
to
VCC.
An
interface
based
on
RS232
standard
levels
(+/-
12
V)
can
be
realized
using
level
shifters
such
as
Maxim
MAX3232.
The
RxD1
has
fixed
input
voltage
thresholds,
which
do
not
depend
on
VCC
(see
NEO-5 Data Sheet
Leave
open
if
unused.
For
the
default
settings
see
the
NEO-5 Data Sheet
Hardware
handshake
signals
and
synchronous
operation
are
not
supported.
2.3.2 USB
The
u-blox
5
USB
interface
supports
the
full-speed
data
rate
of
12
Mbit/s.
2.3.2.1
USB external components
The
USB
interface
requires
some
external
components
in
order
to
implement
the
physical
characteristics
required
by
the
USB
2.0
specification.
These
external
components
are
shown
in
and
listed
in
