ATR0621P_08 Datasheet, PDF (20/31 Pages) ATMEL Corporation – GPS Baseband GPS Baseband

3.4.2
Connecting an Optional Serial EEPROM
The ATR0621P offers the possibility to connect an external serial EEPROM. The internal ROM
firmware supports to store the configuration of the ATR0621P in serial EEPROM. The pin
P16/NEEPROM signals the firmware that a serial EEPROM is connected with the ATR0621P.
The 32-bit RISC processor of the ATR0621P accesses the external memory with SPI (Serial
Peripheral Interface). Atmel recommends to use 32 Kbit 1.8V serial EEPROM, e.g. the Atmel
AT25320AY1-1.8. Figure 3-4 shows an example of the serial EEPROM connection.
Figure 3-4. Example of a Serial EEPROM Connection
AT25320AY1-1.8
SCK
SI
SO
CS_N
P23/SCK
ATR0621P
P24/MOSI
P25/MISO/NAADET0
P29/NPCS3
HOLD_N
WP_N
GND
NC
P16/NEEPROM
P1/GPSMODE0
+3V
(see Power Supply)
GND
GND
NSHDN
LDO_EN
LDO_OUT
VDD18
VDDIO
NC: Not connected
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.
20 ATR0621P
4890H–GPS–08/08