Table of Contents
Advertisement
As long as Vcc is supplied to the ANTARIS
the backup RAM in order to avoid unnecessary battery drain (see Figure 52). Power to RTC and BBR is supplied
from Vcc in this case.
VCC
J1
VBAT
Figure 52: Backup Battery and Voltage
Before Vcc is supplied for the first time, switch J1 Figure 52 is not initialized. In this case increased battery drain
m
ight occur if the backup battery is connected to the V_Bat pin. The battery drain will drop to the specified level
a
s soon as Vcc is applied
N
ote
It's advised
to connect the backup batter
for a short time (e.g. 1s) ASAP after conn
drain.
4
.2.3 Avoiding increase
S
pecial attention has to be paid to the
wake up from FixNOW sleep modes. For that reason
t
urned off. Since these pins hav
r
esistors if the pin is driven low
o
f magnitude, there are different possi
•
Leave these pins open.
•
Pull them to a "HIGH" while th
•
Make sure the outputs, wh
backup mode.
N
ote
When the system is turn
of these 4 pins (RxD1, RxD2, E
(i.e. micro-controlle
GPS Modules - System Integration Manual (SIM) (incl. Reference Design)
GPS.G4-MS4-05007-A1
®
4 GPS Receiver, the backup battery is disconnected from the RTC and
GPS Voltage Supply
Voltage
Supervisor
RTC and Battery Backup RAM (BBR)
the first time.
d current in low
pins RxD1,
e internal pull-up
. To avoid this curren
bilities:
e receiver is in sle
ich drive these pins,
ed off, a current
XTINT0 a
r).
y while Vcc is on or – if not possible
ecting the backup batt
power modes
RxD2, EXTINT0 and EXTINT1. These 4 pins can be used
these pins are powered from backup supply, e
resistors, current (e.g. 15
t, which increases the sleep or backup currents by
ep or backup mode
are in high-impedance state while the receiver is in sle
may flow from backup ba
nd EXTINT1) through ESD protection diodes of you
your position is our focus
– power up the module
ery in order to avoid excessive battery
µA) flows through these internal
ttery through the pull-up resistors
Receiver Description
to
ven if VCC is
an order
ep or
r circuit
Page 62
Advertisement
Table of Contents
