AMY-5M
-
Hardware
Integration
Manual
Objective
Specification
Design-In
GPS.G5-MS5-08207
u-blox
proprietary
Page 13
your position is our focus
2.1.7
and
2.1.8
the
applicable
power-supply
circuitry
for
the
baseband-IC
is
shown
for
the
case
if
no
DC/DC
converter
is
used.
For
supply
voltages
higher
than
3.6
V,
the
use
of
an
external
regulator,
preferably
a
DC/DC
converter,
is
mandatory.
But
again
it
is
obvious
from
Table
2,
that
this
solution
does
not
provide
the
utmost
power-efficiency.
2.1.4 How to connect the Power Supply Pins
Table
3
lists
the
power
supply
pins
and
their
requirements.
Pin
Function
Comments
V_DCDC
Main
Core
Supply
Always
needs
input.
The
current
consumption
varies
over
time
(peak
currents).
Keep
series
resistor
low
to
prevent
ripple
on
the
power
supply.
VDD_3V
Main
RF
Supply
Always
needs
input.
VDD_IO
I/O
Ring
Supply
Always
needs
an
external
supply
V_BCKP
Backup
voltage
supply
Connect
to
GND
if
not
used
VDD_B
Backup
Power
Not
connected
unless
using
supply
capacitors.
VDD_C
Core
Power
Not
connected
unless
using
supply
capacitors.
VDD_RF
Core
Power
Not
connected
unless
using
supply
capacitors.
VDD_ANA
Analog
Power
Not
connected
unless
using
supply
capacitors.
VDD_LNA
LNA
Power
Supply
Not
connected
unless
using
supply
capacitors.
Table 3: Power Supply Pins
2.1.5 Single 2.5…3.6 V Supply
A
single
3.0V
power
supply
is
very
easy
to
design
but
is
not
the
most
economic
solution
to
run
u-blox
5
receivers
(see
section
2.1.3
for
details).
AMY-5
XTAL_IN
XTAL_OUT
V_DCDC
2.5...3.6 V
Main Battery
1.4...3.6 V
Backup Battery
V_BCKP
Crystal
C20
f
XTAL
= 32.768 kHz
Y2
C19
(optional)
V_TH
Connect
to GND
Connect
XTAL_IN
to GND
if no RTC used
VDD_3V
VDD_RF
When connecting
to V_DCDC
a filter is imperative
VDD_B
VDD_C
VDD_ANA
VDD_LNA
VDD_IO
1.65...3.6 V
V_RESET
Figure 3: Single 2.5…3.6 V Supply
