Rainbow Electronics ATR0622 - Manual (Page 15)

15
4891CS–GPS–01/06
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/
NPCS0
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 .
P27/GPSMODE11/NPCS1
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 .
P29/GPSMODE12/NPCS3
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 .
P30/AGCOUT0 Internal pull-down resistor, leave open.
P31/RXD1 Internal pull-up resistor, leave open if serial interface is not used.