ATR0622 Datasheet, PDF (15/26 Pages) ATMEL Corporation – GPS Baseband Processor

ATR0622 [Preliminary]
Table 3-15. Recommended Pin Connection
Pin Name
Recommended External Circuit
P0/NANTSHORT
Internal pull-down resistor, leave open if Antenna Supervision functionality is unused. Can be left open if
configured as output by user application.
P1/GPSMODE0
Internal pull-down resistor, leave open, in order to disable the GPSMODE pin configuration feature. Connect
to VDDIO to enable the GPSMODE pin configuration feature. Refer to GPSMODE definitions in section
“Setting GPSMODE0 to GPSMODE12” on page 9. Can be left open if configured as output by user
application.
P2/BOOT_MODE
Internal pull-down resistor, leave open.
P8/STATUSLED
Output in default ROM firmware: leave open, only needs pull-up resistor to VDDIO or pull-down resistor to
GND if used as GPIO input by user application and is not always driven from external sources.
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 or configured as output by user
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P13/GPSMODE3/
EXTINT1
Internal pull-up resistor, can be left open if the GPSMODE feature is not used or configured as output by user
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P14/NAADET1
Internal pull-down resistor, leave open if Antenna Supervision functionality is unused. Can be left open if
configured as output by user application.
P15/ANTON
Internal pull-down resistor, leave open if Antenna Supervision functionality is unused. Can be left open if
configured as output by user application.
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 or configured as output by
user application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page
9.
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 or configured as output by user
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P20/TIMEPULSE/SCK2 Output in default ROM firmware: leave open if timepulse 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 or configured as output by user
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P24/GPSMODE8/MOSI
Internal pull-up resistor, can be left open if the GPSMODE feature is not used or configured as output by user
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P25/NAADET0/MISO
Internal pull-down resistor, leave open if Antenna Supervision functionality is unused. Can be left open if
configured as output by user application.
P26/GPSMODE10/NSS/ Internal pull-up resistor, can be left open if the GPSMODE feature is not used or configured as output by user
NPCS0
application. Refer to GPSMODE definitions in section “Setting GPSMODE0 to GPSMODE12” on page 9.
P27/GPSMODE11/NPCS1
Internal pull-up resistor, can be left open if the
application. Refer to GPSMODE definitions in
GPSMODE feature is not used or configured as
section “Setting GPSMODE0 to GPSMODE12”
output by user
on page 9.
P29/GPSMODE12/NPCS3
Internal pull-up resistor, can be left open if the
application. Refer to GPSMODE definitions in
GPSMODE feature is not used or configured as
section “Setting GPSMODE0 to GPSMODE12”
output by user
on page 9.
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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4891CS–GPS–01/06