your position is our focus
When
migrating
from
an
ANTARIS
GPS
receiver
(TIM-Lx
or
LEA-LA),
reduce
R5
of
the
Antenna
Short
and
Open
Supervisor
circuit
to
33k
(see
Section 4.3.3.2
).
Serial Communication (see
Section 4.3
)
Choose
UBX
for
an
efficient
(binary)
data
handling
(see
Section 4.4.3
)
or
if
more
data
is
required
than
supported
by
NMEA
(see
Section 4.4.4
)
When
using
UBX
protocol,
check
if
the
UBX
quality
flags
(see
Section 4.6.9.2
)
are
used
properly.
Choose
NMEA
for
compatibility
to
other
GPS
services,
e.g.
TIM-ST
(see
Section 4.4.4
)
Customize
the
NMEA
output
if
required
(e.g.
NMEA
version
2.3
or
2.1,
number
of
digits,
output
filters
etc.)
Schematic
If
required,
does
your
schematic
allow
using
different
TIM-4x
or
LEA-4x
variants?
For
TIM-4x
modules
see
Table 82
for
a
comparison,
for
LEA-4x
refer
to
Table 83
.
Leave
the
RESET_N
pin
open
if
not
used.
Don’t
drive
it
high
(
see Section 4.9.2
)!
Leave
BOOT_INT
pin
open
if
not
used
for
firmware
update.
Check
the
GPSMODE
pins
connection
for
start-up
configuration
of
Low
Cost
Receivers
(
see 4.8.2
).
Plan
use
of
2
nd
interface
(USB
or
serial
port)
for
firmware
updates
or
as
a
service
connector.
LEA-4 Design
3.2
x
For
a
minimal
Design
with
LEA-
f
•
Connect
the
Power
supply
en
-powered.
In
case
of
bus-powered
devices,
ect
the
U
pow
su
befo
B.
a
op
d
conn
n
to
all
gr
t
the
na
RF
nna
supply
(V_ant)
ve
antennas
(in rn
e
an
active
an
na
s
b
to
LE
as
shown
in
section
4.3.3.1
follow
the
la
ations
in
section
3.6.6
.
se
the
required
rial
interface
applicatio
•
If
you
need
Hot-
or
Warmstart
in
your
applica
ecide
wheth
TIMEPULS
OT
t
the
appropriate
pins
on
your
m
•
Have
you
chosen
the
module
with
the
correc
minimal
up
f
a
r
d
design
requirements
in
Table 5
4x
the
following
to
VCC
wh
unction
and
pins
have
to
be
considered:
the
device
is
self
conn
SB
er
pply
to
a
LDO
re
feeding
it
to
Vcc
and
VDDUS
•
Assure
timal
groun
anten
ectio
ound
pins
of
the
LEA
module
•
Connec
for
acti
to
te
_IN
over
a
matching
al
or
external
pow
50
Ohm
micro
strip
and
define
the
ante
r
supply)
•
If
ten
hall e
connected
and
A-4M,
make
sure
add
an
inductor
for
the
antenna
bias
voltage
yout
recommend
•
Choo
se
communication
(USART
or
USB)
and
connect
the
appropriate
pins
to
your
n
tion,
connect
a
Backup
Battery
to
V_BAT
MODE
option
are
required
in
your
application
and
connec
•
D
er
E,
RESET
or
BO
odule
t
temperature
range?
with
LEA-4x
modules.
Now
check
about
special
functions
an
This
is
a
set
or
PVT
GPS
receive
.
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Design-In
GPS.G4-MS4-05007-A1
Page 44
