7

4925G–GPS–06/08

ATR0625P

3.2

Signal Description

Table 3-2.

ATR0625P Signal Description

Module

Name

Function

Type

Active Level Comment

EBI

BOOT_MODE

Boot Mode Input

Input

–

PIO-controlled after reset,

internal pull-down resistor

USART

TXD1 to TXD2

Transmit Data Output

Output

–

PIO-controlled after reset

RXD1 to RXD2

Receive Data Input

Input

–

PIO-controlled after reset

SCK1 to SCK2

External Synchronous Serial Clock

I/O

–

PIO-controlled after reset

USB

USB_DP

USB Data (D+)

I/O

–

USB_DM

USB Data (D-)

I/O

–

APMC

RF_ON

Output

–

Interface to ATR0601

AIC

EXTINT0-1

External Interrupt Request

Input

High/

Low/

Edge

PIO-controlled after reset

AGC

AGCOUT0-1

Automatic Gain Control

Output

–

Interface to ATR0601

PIO-controlled after reset

RTC

NSLEEP

Sleep Output

Output

Low

Interface to ATR0601

NSHDN

Shutdown Output

Output

Low

Connect to pin LDO_EN

XT_IN

Oscillator Input

Input

–

RTC oscillator

XT_OUT

Oscillator Output

Output

–

RTC oscillator

SPI

SCK

SPI Clock

I/O

–

PIO-controlled after reset

MOSI

Master Out Slave In

I/O

–

PIO-controlled after reset

MISO

Master In Slave Out

I/O

–

PIO-controlled after reset

NSS/NPCS0

Slave Select

I/O

Low

PIO-controlled after reset

NPCS1 to NPCS3

Slave Select

Output

Low

PIO-controlled after reset

PIO

P0 to P31

Programmable I/O Port

I/O

–

Input after reset

GPS

SIGHI0

Digital IF

Input

–

Interface to ATR0601

SIGLO0

Digital IF

Input

–

Interface to ATR0601

SIGHI1

Digital IF

Input

–

PIO-controlled after reset

SIGLO1

Digital IF

Input

–

PIO-controlled after reset

TIMEPULSE

GPS synchronized time pulse

Output

–

PIO-controlled after reset

CONFIG

GPSMODE0-12

GPS Mode

Input

–

PIO-controlled after reset

STATUSLED

Status LED

Output

–

PIO-controlled after reset

NEEPROM

Enable EEPROM Support

Input

Low

PIO-controlled after reset

ANTON

Active antenna power on Output

Output

–

PIO-controlled after reset

NANTSHORT

Active antenna short circuit

detection Input

Input

Low

PIO-controlled after reset

NAADET0-1

Active antenna detection Input

Input

Low

PIO-controlled after reset

Note:

1. The USB transceiver is disabled if VDD_USB < 2.0V. In this case the pins USB_DM and USB_DP are connected to GND

(internal pull-down resistors). The USB transceiver is enabled if VDD_USB is within 3.0V and 3.6V.