18
4979D–GPS–06/08
ATR0635P1
Table 3-15. Recommended Pin Connections
Pin Name Recommended External Circuit
P0/NANTSHORT Internal pull-down resistor; leave open if Antenna Supervision functionality is unused.
P1/GPSMODE0
Internal pull-down resistor; leave open in order to disable the GPSMODE pin configuration feature. Connect
to VDD18 to enable the GPSMODE pin configuration feature. Refer to GPSMODE definitions in “Setting
GPSMODE0 to GPSMODE12” on page 12.
P2/BOOT_MODE Internal pull-down resistor; leave open.
P8/STATUSLED Output in default ROM firmware: leave open if not used
P9/EXTINT0 Internal pull-up resistor; leave open if unused.
P12/GPSMODE2/NPCS2
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P13/GPSMODE3/
EXTINT1
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P14/NAADET1 Internal pull-down resistor; leave open if Antenna Supervision functionality is unused.
P15/ANTON Internal pull-down resistor; leave open if Antenna Supervision functionality is unused.
P16/NEEPROM Internal pull-up resistor; leave open if no serial EEPROM is connected. Otherwise connect to GND.
P17/GPSMODE5/SCK1
Internal pull-down resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P18/TXD1 Output in default ROM firmware: leave open if serial interface is not used.
P19/GPSMODE6/SIGLO1
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P20/TIMEPULSE/SCK2 Output in default ROM firmware: leave open if time pulse feature is not used.
P21/TXD2 Output in default ROM firmware: leave open if serial interface not used.
P22/RXD2 Internal pull-up resistor; leave open if serial interface is not used.
P23/GPSMODE7/SCK
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P24/GPSMODE8/MOSI
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P25/NAADET0/MISO Internal pull-down resistor; leave open if Antenna Supervision functionality is unused.
P26/GPSMODE10/NSS/
NPCS0
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P27/GPSMODE11/NPCS1
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P29/GPSMODE12/NPCS3
Internal pull-up resistor; can be left open if the GPSMODE feature is not used. Refer to GPSMODE
definitions in “Setting GPSMODE0 to GPSMODE12” on page 12.
P30/AGCOUT0 Internal pull-down resistor; leave open.
P31/RXD1 Internal pull-up resistor; leave open if serial interface is not used.
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