ATR0621P_08 Datasheet, PDF (18/31 Pages) ATMEL Corporation – GPS Baseband GPS Baseband

Table 3-15. Recommended Pin Connection (Continued)
Pin Name
Recommended External Circuit
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 11.
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 11.
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 11.
P28/EM_A20/NCS3
Output in default ROM firmware: leave open, only needs pull-up resistor to VDD18 or pull-down resistor to
GND if used as GPIO input by user application and is not always driven from external sources.
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 11.
P30/AGCOUT0
Internal pull-down resistor, leave open.
P31/RXD1
Internal pull-up resistor, leave open if serial interface is not used.
EM_DA0 – EM_DA15
If no external memory is used, could be leave open (internal pull-down).
18 ATR0621P
4890H–GPS–08/08