14

4890AS–GPS–09/05

ATR0621 [Preliminary]

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

3.4

External Connections for a Working GPS System

Figure 3-2.

Example of an External Connection

ATR0601

SIGH

SIGL

SC

P1

ATR0621

SIGHI

SIGLO

CLK23

RF_ON

NSLEEP

P2

EM_DA0 - 15

See Table 3-15

EM_A1 - 19

NC

NRESET

NC

See Table 3-15

P20

TIMEPULSE

P16 - 17

See Table 3-15

P0 - 7

P9 - 15

See Table 3-15

P19

See Table 3-15

P23 - 30

See Table 3-15

USB_DM

USB_DP

Optional

USB

P31

P18

Optional

USART 1

P22

P21

Optional

USART 2

P8

STATUS LED

TMS

NC

TDI

NC

TCK

NC

NTRST

NC

TDO

NC

TEST_MODE

NC

DBG_EN

NC

NSHDN

LDO_EN

LDO_OUT

VDD18

+3V

(see Power Supply)

LDO_IN

LDOBAT_IN

GND

GND

VBAT18

+3V

(see Power Supply)

TOUT1

NC

XT_IN

XT_OUT

32.368 kHz

(see RTC)