atr0621 ATMEL Corporation, atr0621 Datasheet - Page 13

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atr0621

Manufacturer Part Number
atr0621
Description
Gps Baseband Processor - Atmel Corporation
Manufacturer
ATMEL Corporation
Datasheet

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3.3.5
4890AS–GPS–09/05
Active Antenna Supervisor
If GPSMODE configuration is enabled, the two pins P0/NANTSHORT and P15/ANTON, plus
one pin of P25/NAADET0/MISO or P14/NAADET1 are initialized as general purpose I/Os and
used as follows:
Table 3-13.
Table 3-14.
Pin
P0/NANTSHORT
P25/NAADET0/
MISO or
P14/NAADET1
P15/ANTON
GPSMODE11
(Reset = PU)
• P15/ANTON is an output which can be used to switch on and off the antenna power supply.
• Input P0/NANTSHORT will indicate an antenna short circuit, that is, zero DC voltage at the
• Input P25/NAADET0/MISO or P14/NAADET1 will indicate that a DC current is sunk into
antenna, to the firmware. If the antenna is switched off by output P15/ANTON, it is
assumed that also input P0/NANTSHORT will signal zero DC voltage, that is, switch to its
active low state.
the antenna. In case of short circuit, both P0 and P25/P14 will be active, that is, at low
level. If the antenna is switched off by output P15/ANTON, it is assumed that input
P25/NAADET0/MISO will also signal zero DC current, that is, switch to its active low state.
Which pin is used as NAADET (P14 or P25) depends on the settings of GPSMODE11 and
GPSMODE10
0
0
0
0
1
1
1
1
GPSMODE10
Pin Usage of Active Antenna Supervisor
Antenna Detection I/O Settings
(Reset = PU)
(Table
0
0
1
1
0
0
1
1
Usage
NANTSHORT
NAADET
ANTON
3-14).
(Reset = PU) Location of NAADET
GPSMODE9
0
1
0
1
0
1
0
1
Meaning
Active antenna short circuit detection
High = No antenna DC short circuit present
Low = Antenna DC short circuit present
Active antenna detection input
High = No active antenna present
Low = Active antenna is present
Active antenna power on output
High = Power supply to active antenna is switched on
Low = Power supply to active antenna is switched off
P25/NAADET0/MISO
P25/NAADET0/MISO
P14/NAADET1
P14/NAADET1 (Default)
P14/NAADET1
P14/NAADET1
P25/NAADET0/MISO
P25/NAADET0/MISO
ATR0621 [Preliminary]
Comment
Reserved for further use. Do
not use this setting.
Reserved for further use. Do
not use this setting.
Reserved for further use. Do
not use this setting.
13

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