13

4925G–GPS–06/08

ATR0625P

The Antenna Supervisor Software will be configured as follows:

1.

Enable Control Signal

2.

Enable Short Circuit Detection (power down antenna via ANTON if short is detected via

NANTSHORT)

3.

Enable Open Circuit Detection via NAADET

The antenna supervisor function may not be disabled by GPSMODE pin selection.

If the antenna supervisor function is not used, please leave open ANTON, NANTSHORT and

NAADET.

Table 3-13.

Pin Usage of Active Antenna Supervisor

Pin

Usage

Meaning

P0/NANTSHORT

NANTSHORT

Active antenna short circuit detection

High = No antenna DC short circuit present

Low = Antenna DC short circuit present

P25/NAADET0/

MISO or

P14/NAADET1

NAADET

Active antenna detection input

High = No active antenna present

Low = Active antenna is present

P15/ANTON

ANTON

Active antenna power on output

High = Power supply to active antenna is switched on

Low = Power supply to active antenna is switched off

Table 3-14.

Antenna Detection I/O Settings

GPSMODE11

(Reset = PU)

GPSMODE10

(Reset = PU)

GPSMODE8

(Reset = PU) Location of NAADET

Comment

0

0

0

P25/NAADET0/MISO

00

P25/NAADET0/MISO

0

P14/NAADET1

Reserved for further use.

Do not use this setting.

P14/NAADET1

(Default ROM value)

0

0

P14/NAADET1

Reserved for further use.

Do not use this setting.

P14/NAADET1

Reserved for further use.

Do not use this setting.

0

P25/NAADET0/MISO

P25/NAADET0/MISO

Note:

1. Leave open