AMY-5M
-
Hardware
Integration
Manual
Objective
Specification
Design-In
GPS.G5-MS5-08207
u-blox
proprietary
Page 16
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2.1.8 Separate Supplies of 3.0 V (2.5…3.6 0V) and 1.4 V (1.4…3.6 V)
The
dual
3.0V
and
1.4V
power
supply
the
most
efficient
configuration
to
run
u-blox
5
receivers
(see
section
2.1.3
for
details).
It
assures
a
better
stability
than
a
single
3.0V
power
supply
as
the
sensitive
RF
supply
is
well
separated
from
the
fluctuating
base
band
power
supply.
AMY-5
VDD_IO
VDD_IO 1.65...3.6 V
XTAL_IN
XTAL_OUT
V_DCDC
1.4...3.6 V
1.4V Supply
1.4...3.6 V
Backup Battery
V_BCKP
VDD_ANA
VDD_LNA
VDD_C
V_TH
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
VDD_3V
2.5...3.6 V
3.0V Supply
VDD_RF
VDD_B
(optional)
V_RESET
Connect
XTAL_IN
to GND
if no RTC used
Connect
to GND
Figure 6: Dual Supplies of 3.0 V and 1.4 V
2.1.9 Power
Modes
u-blox
5
technology
offers
power
optimized
architecture
with
built-in
autonomous
power
saving
functions
that
minimize
power
consumption
at
any
given
time.
u-blox
5
can
be
operated
in
two
different
power
modes:
Maximum
Performance
and
Eco
Mode.
In
both
cases,
the
receiver
is
operated
in
continuous
mode.
The
difference
lies
in
how
the
acquisition
engine
is
used.
Maximum
Performance
Mode
freely
uses
the
acquisition
engine,
resulting
in
the
best
possible
TTFF
at
weak
signals.
With
Eco
Mode
the
use
of
the
acquisition
engine
is
optimized
to
deliver
lower
current
consumption.
PIO21
selects
between
these
two
modes.
Further
Low
Power
Modes
to
reduce
power
consumption
during
operation
are
planned.
For
more
information,
see
the
u-blox
5 Protocol Specification
[3].
