u-blox ANTARIS 4 - Page 46

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Function
PIN
(LEA)
I/O Description Remarks
Serial Port /USB
  
TheserialoutputvoltagelevelsonTxdependontheappliedVDDIOvoltage
level.
TxD1
3 O SerialPort1
VDDIOserialportoutput.Leaveopenifnotused.
RxD1
4 I SerialPort1
ifnotused.
 Note Don’tuse anexternalpullupresistor.
5Vtolerantserialportinputwithinternalpull-upresistorto V_BAT.Leaveopen
Tx 2D
3
1 O SerialPort2
LEA-4A / LEA-4S / LEA-4M(only):
VDDIO serialportoutput.Leaveopenifnotused.
LEA-4A / LEA-4S / LEA-4M(only):
RxD2
2 I SerialPort2
ifnotused.
5Vtolerantserialportinputwithinternalpull-upresistorto V_BAT.Leaveopen
 Note Don’tuseanexternalpullupresistor.
USB_DM
25
USB_DP
26
I/O USBI/Oline
USB1.1bidirectionalcommunicationpin.TobefullycompliantwithUSB
standardfollowtheschematicrecommendationinSection 4.4.2.
System
  

BOOT_INT
12 I Bootmode
DonotconnectonLEA-4A, LEA-4MandLEA-4Sreceivers.
RESET_N
10 I
HardwareReset
(ActiveLow)
Leaveopenifnotused.Donotdrivehigh.SeealsoSection 4.9.2.
TIMEPULSE
28 O TimepulseSignal
ConfigurableTimepulsesignal(onepulsepersecondbydefault).Leaveopenif
notused.SeealsoSection 4.7.1.
EXTINT0
27ExternalInterrupt
ExternalInterruptPintowakeupreceiverinFixNOW™sleepmode.Seealso
Section 4.2.7.1and4.9.4forfurtherinformation.
Internalpull-upresistorto V_BAT.Leaveopenifnotused.
GPSMODE6/
PCS0_N/ SS_N/
P26
9 I/O
GPSMODE5/
EXTINT1/ P13
21 I/O
GPSMODE23
4
/
GPSMODE2/
PCS2_N/P12
22 I/O
GPIO/
GPSMODEPin
LEA-4A/ LEA-4S/ LEA-4M:
GPSMODEPin;leaveopenifdefaultconfigurationisused.
RefertoSection4.8.2forfurtherinformation

LEA-4P / LEA-4H/ LEA-4T:
GPIOPin;leaveopenifnotused
TheGeneralPurposeI/O(GPIO)canonlybeprogrammedwiththeANTARIS
®
4
SoftwareCustomizationKit,pleaserefertotheSCK Manual [8]whenintending
touseoftheGPIO’softhereceiver.
GPSMODE7/
Connect
SCK/ P23
23 I/O
USBBoottime
configurationpin
LEA-4A/ LEA-4S / LEA-4M:
DefinesthePowerSupplymodeoftheGPSmodule.GPSMODE7=high
(default)meansthatthemodulehasit’sownpowersupply.GPSMODE7=low
meansthattheGPSmoduleispoweredbytheUSBbus.
toGND,whenBusPoweredModeisrequired.
Otherwiseleaveopen.
FordetailsaboutconfigurationsettingsrefertoSection 4.8.2.
LEA-4H/ LEA-4T:
leaveopenifnotused
TheGeneralPurposeI/O(GPIO)canonlybeprogrammedwiththeANTARIS
®
4
fertothe SCK Manual [8]whenintending
LEA-4P /
GPIOPin;
SoftwareCustomizationKit,pleasere
touseoftheGPIO’softhereceiver.
MOSI/ P24
1 I/O
MSIO/ P25
2  I/O
GPIO
LEA-4H / TIM-4P (only):
GPIOPin;leaveopenifnotused
 Note UsedasRxD2/ TxD2onLEA-4A/LEA-4S/LEA-4Mreceivers.
Table 5: Pinnout LEA-4x

3
UsedasMOSI/MISO/GPIOpinsonLEA-4H,LEA-4PandLEA-4Treceivers.
4
Connecting theGPSMODE23 pin (LEA-4S)to GND increasestheFixNOW sleep mode currentby about 50µA.Connecti ng theGPSMOD E2
pin(LEA-4AtoGNDdoeshowevernothaveanimpactontheFixNOWsleepmodecurrent.
GPSModules-SystemIntegrationManual(SIM)(incl.ReferenceDesign) Design-In
GPS.G4-MS4-05007-A1
  Page 46