your position is our focus
4.2 Power Management
4.2.1 Connecting
Power
The
ANTARIS
®
4
GPS
Receiver
basically
has
two
power
supply
pins,
VCC
and
VBAT
.
For
LEA
modules
there
is
an
additional
pad
power
supply
pin
VDDIO
that
defines
the
IO
voltage
levels.
Figure 50
shows
the
internal
connections
of
the
power
supply
network.
ANTARIS
4 Baseband
Chip
VCC
VBAT
VCC
LDO
VBAT
LDO
Voltage
Supervisor
1.8 V to ATR062x core,
FLASH
1.8 V to ATR0621 RTC
and backup SRAM
Noise F
to RF section:
A and ATR0601
ilter
LN
VCC_RF
VDD18OUT
Figure 50: Power supply concept
4.2.1.1
VCC - Main Power
Main
power
supply
is
fed
through
the
VCC
pin.
During
operation,
the
current
drawn
by
the
ANTARIS
®
4
GPS
me
orders
of
magnitude,
especially,
if
low-power
operation
modes
are
enabled.
It
is
important
that
the
system
power
supply
circuitry
is
able
to
support
the
peak
power
(see
datasheet
for
specification)
for
a
short
time.
In
order
to
dimension
a
battery
capacity
for
certain
application
the
sustained
se
of
VCC
ripple
voltage
at
the
module.
It
is
also
a
good
idea
to
place
a
In
case
failure
on
pin
VCC
,
real-time
clock
and
backup
RAM
are
supplied
through
pin
V_bat
.
This
enables
the
ANTARIS
®
4
GPS
receiver
to
recover
from
power
failure
with
either
a
Hotstart
or
a
Warmstart
(depending
on
the
duration
of
VCC
outage)
and
to
maintain
the
configuration
settings.
If
no
Backup
Battery
is
connected,
the
receiver
performs
a
Coldstart
at
power
up.
Note
If
no
backup
battery
is
available
connect
the
V_bat
pin
to
GND.
Receiver
can
vary
by
so
power
figure
shall
be
used.
Note
A
GPS
receiver
is
sensitive
to
ripples
on
the
power
supply
voltage.
The
max
ripple
must
not
exceed
50
mV
peak
to
peak.
It
is
strongly
recommended
to
design
a
low-resistance
connection
from
the
voltage
regulator
to
the
VCC
supply
pin
of
the
module.
Any
resistive
or
inductive
losses
in
this
path
may
result
in
an
undesired
increa
large
capacitor,
e.g.
10µF,
close
to
the
VCC
pin
of
the
module.
4.2.2 Backup
Battery
power
of
a
GPS
Modules
-
System
Integration
Manual
(SIM)
(incl.
Reference
Design)
Receiver
Description
GPS.G4-MS4-05007-A1
Page 61
