TIM-5H
-
Hardware
Integration
Manual
Design-In
GPS.G5-MS5-07015-A-1
u-blox
proprietary
Page 14
your position is our focus
2.5 Design-In
This
section
provides
a
Design-In
Checklist
as
well
as
Reference
Schematics
for
new
designs
with
u-blox
5.
For
migration
of
existing
ANTARIS
®
4
product
designs
to
u-blox
5
please
refer
to
Appendix A
2.5.1 Schematic Design-In Checklist for u-blox 5
Designing-in
a
TIM-5H
GNSS
receiver
is
easy
especially
when
a
design
is
based
on
the
reference
design
in
the
Hardware
Integration
Manual.
Nonetheless,
it
pays
to
do
a
quick
sanity
check
of
the
design.
This
section
lists
the
most
important
items
for
a
simple
design
check.
The
Layout
Design-In
Checklist
also
helps
to
avoid
an
unnecessary
respin
of
the
PCB
and
helps
to
achieve
the
best
possible
performance.
It
is
highly
recommended
to
follow
the
Design-In
Checklist
when
developing
any
u-blox
5
GNSS
applications.
This
can
significantly
reduce
development
time
and
costs.
Have you chosen the optimal module?
The
TIM-5H
has
been
intentionally
designed
to
fit
into
existing
TIM
designs.
The
new
TIM-5H
is
as
far
as
possible
compatible
to
the
previous
generations
mainly
ANTARIS
4.
For
details
to
be
considered
in
the
migration
process,
please
refer
to
Check Power Supply Requirements and Schematic:
Is
the
power
supply
within
the
specified
range?
Compare
the
peak
current
consumption
of
TIM-5H
with
the
specification
of
your
power
supply.
GPS
receivers
require
a
stable
power
supply,
avoid
ripple
on
VCC
(<50mVpp)
Backup Battery
For
achieving
a
minimal
Time
To
First
Fix
(TTFF)
after
a
power
down,
make
sure
to
connect
a
backup
battery
to
V_BCKP.
Antenna
The
total
noise
figure
should
be
well
below
3dB.
If
a
patch
antenna
is
the
preferred
antenna,
choose
a
patch
of
at
least
15x15mm.
Designs
using
smaller
antennas
require
Aiding
Make
sure
the
antenna
is
not
placed
close
to
noisy
parts
of
the
circuitry.
(e.g.
micro-controller,
display,
etc.)
For
active
antennas
add
a
10R
resistor
in
front
of
V_ANT
input
for
short
circuit
protection
or
use
the
antenna
supervisor
circuitry.
Schematic
Don’t
drive
RESET_N
high!
Plan
use
of
2
nd
interface
(Testpoints
on
serial
port,
DDC,
SPI)
for
firmware
updates
or
as
a
service
connector.
2.6 TIM-5H Design
For
a
minimal
Design
with
TIM-5H
the
following
functions
and
pins
need
to
be
considered:
•
Connect
the
Power
supply
to
VCC.
•
Assure
an
optimal
ground
connection
to
all
ground
pins
of
the
TIM
module
especially
close
to
RF_IN
.
•
Connect
the
antenna
to
RF_IN
over
a
matching
50
Ohm
micro
strip
and
define
the
antenna
supply
(
V_ANT
)
for
active
antennas
(internal
or
external
power
supply)
•
Choose
the
required
serial
communication
interface
(USART)
and
connect
the
appropriate
pins
to
your
application
•
If
you
need
Hot-
or
Warmstart
in
your
application,
connect
a
Backup
Battery
to
V_BCKP
