ATR0635_08 Datasheet, PDF (19/35 Pages) ATMEL Corporation – ANTARIS4 Single-chip GPS Receiver SuperSense

ATR0635
3.5 Connecting an Optional Serial EEPROM
The ATR0635 offers the possibility of connecting an external serial EEPROM. The internal ROM
firmware supports storing the configuration of the ATR0635 in serial EEPROM. The pin
P16/NEEPROM signals the firmware that a serial EEPROM is connected to the ATR0635. The
ATR0635’s 32-bit RISC processor accesses the external memory via SPI (serial peripheral inter-
face). For best results, use a 32-Kbit 1.8V serial EEPROM such as Atmel’s AT25320AY1-1.8.
Figure 3-3 shows an example of the serial EEPROM connection.
Figure 3-3. Example of a Serial EEPROM Connection
AT25320AY1-1.8
SCK
SI
SO
CS_N
P23/SCK
ATR0635
P24/MOSI
P25/MISO/NAADET0
P29/NPCS3
HOLD_N
WP_N
GND
NC
P16/NEEPROM
P1/GPSMODE0
+3V
(see Power Supply)
NC: Not connected
GND
GND
NSHDN
LDO_EN
LDO_OUT
VDD18
VDDIO
LDO_IN
LDOBAT_IN
Note: The GPSMODE pin configuration feature can be disabled, because the configuration can be
stored in the serial EEPROM. VDDIO is the supply voltage for the pins: P23, P24, P25 and P29.
19
4928H–GPS–06/08