Maestro A2200-A Bedienungsanleitung PDF herunterladen (Seite 21)

V1.0 – Aug-13

User’s Manual

Page 21 of 37

5.2 Description A2235-H Signals

Symbol

Function

Description

nRST

Input

Reset input, active low

GPIO3

None

Leave open

VCC3V3

Power Supply

3.0 – 3.6 V DC

WAKEUP

Output

- Status of digital section, Push-Pull output

Low = OFF, KA (Keep Alive)-only, Hibernate, or Standby

mode

High = ON, operational mode

- Connect it to ON_OFF pin for self-start mode

Vout

Voltage Output

Permanent 1.8V voltage output for up to 20mA current

max.

GND

Power Supply

Ground (power supply)

GPIO6

CTS

(SPI CLK)

Input

Configuration pin for communication mode. 10K to 1.8V

for UART mode; leave open for SPI & host port I2C

modes.

SPI clock pin when module works in SPI mode

GPIO7

RTS

(SPI CS)

Input

Configuration pin for communication mode. 10K to GND

for host port I2C mode; leave open for SPI & UART

modes.

SPI chip select pin when module works in SPI mode

GND

Power Supply

Ground (power supply)

ANT_EXT

Antenna Input

Antenna signal / Z=50 Ohm (external active antenna in-

put)

VANT

Power supply

Power supply antenna – provide according voltage (up to

5.0 VDC) - VANT feeds Pin 8 ANT_EXT

ANT_SW

Input

Antenna switch (LOW or open = internal antenna, HIGH =

external antenna)

GPIO2

None

Leave open

Host Port

I2C_CLK

Input

Host port I2C clock pin when module works in host port

I2C mode

GPIO4

Input

External interrupt input pin – reserved for future use, leave

open

TM_GPIO5

Output

Time Mark – 1PPS signal

GPIO 1

I2C CLK

Input / Output

Configuration pin for the baud rate,2.2K to 1.8V for the

baud rate 4800 bps (see also“Configure the baud rate“).

I2C clock output to MEMS interface

GPIO 0

I2C DIO

Input / Output

Configuration pin for the baud rate,2.2K to 1.8V for the

baud rate 4800 bps (see also“Configure the baud rate“).

I2C I/O to MEMS interface

ON_OFF

Input

Connect to push-pull output! This is mandatory!

- Set to LOW by default

- Toggle to HIGH and back to LOW

> for first start-up after power on

> to request a fix in SiRFaware

or PTF mode

> to go into or wake up out of hibernate mode

- Connect it to WAKEUP pin for self-start mode

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