u-blox ANTARIS 4 User Manual

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4.9 System Functions
4.9.1 Reset Options
The ANTARIS
®
4 GPS Technology distinguishes between four types of reset. An external hardware reset (by
pulling open drain RESET_N pin low), two resets are controlled software resets and one is an asynchronous
softwarereset,whichareusedtoshutdownandrestartpartsor e
Theforcedresetperformsan
immediatehardwareresetsimilar exter ard reset.
Uponeverysoftwarereset,it’s possibleto definethetypeofstart-upscen (Hotst rt,Warmstart,Coldstart).
Thisstart-upscenariodefineswhichGPSdataisreusedandwh iscleared .g. epheme ed
foraWarmstart).
4.9.1.1 Controlled Reset
TheControlledReset
waitsuntilthesystemisinthebackgroundtask(allta e Itthe 
StopEventandaSystemStopEvent.Afterthatthesoftwareisstartedaga is nsthattheconfiguration
fromBBR(batterybackupRAM)orFlash(dependingonthefirm d)
loa
4.9.1.2 Controlled GPS only Reset
The Controlled GPS only Reset waits until all GPS Tasks e idle (not running or pending). It then resets the
NavigationandTrackingEngineandstartsthemagain.Thesystemisnotfullyrestartedfromscratch.
The Forced Reset is an asynchronous reset that immediately stops all tasks that
 are running and resets the
hardware. No System Stop or GPS Stop Event is  sent. This  reset is equivalent to an externally supplied reset
gnal.
4.9.2 RESET_N - Reset signal generation and use
ected to VCC to RESET the GPS receiver, when the
supplyvoltagedropsbelow2.4V.
thewhol receiver.
tothe nalh ware 
ario a
ich (e the risdataisclear
sksar idle). nbroadcastsaGPS
in.Th mea
wareuse is
re ded.
 ar
4.9.1.3 Forced Reset (Watchdog)
si
All ANTARIS
®
4 modules contain a Voltage detector conn
ATR062x
VCC
Voltage
Supervisor
VCC
LDO
1.8 V
tointernal
RESET:
ATR0621andFLASH
RESET_N
Voltage
Detector

onecanapplyexternallogictodrivetheRESET_Nsignallowtoactivate
. applicati of re
Figure 94: RESET generation
RESET_NisanopendrainI/Opin,thus
a hardware reset of the system  In most ons, the use  the RESET_N pin is not requi d since
ANTARIS4GPSmodulescontainaninternalresetchip.LeaveRESET_N
unconnectedifnotused.
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) ReceiverDescription
GPS.G4-MS4-05007-A1
  Page 121

u-blox ANTARIS 4 Specifications

General

Brand	u-blox
Model	ANTARIS 4
Category	GPS
Language	English