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V1.2 – May-11 User’s Manual Page 14 of 37

3 Quick Start

In order to allow an easy and quick start with the A2100-A module, this chapter

provides a short overview on the important steps to be taken to receive NMEA

messages with position information on a serial port (UART).

NOTE 1: The A2100-A needs an external pull-up resistor to be configured for

UART operation. Please consider the pull-up resistor in your design or pull the

GPIO up right after reset by other means.

NOTE 2: The ON_OFF input of the A2100-A needs to be connected to a

push-pull output of a microprocessor. For a wake-up, including the initial one

after power on, a LOW-HIGH transmission is mandatory.

NOTE 3: It is recommended to connect the nRST pin of the A2100-A to an open

collector / open drain output of a microprocessor!

3.1 Minimum Configuration

The following picture shows the minimum configuration for NMEA or binary outputs

received and commands sent via an RS232 interface based on the GPS module

A2100-A using a passive antenna.

A2100-A

GSD4e

UART

ON_OFF

GND

3.3V

ANT_EXT

ANT_GND

Vcc

Shown from top without lid; pads shown for better understanding

Pin 1

marker

10kΩ

nRST

A2100-A

GSD4e

UART

ON_OFF

GND

3.3V

ANT_EXT

ANT_GND

Vcc

Shown from top without lid; pads shown for better understanding

Pin 1

marker

10kΩ

nRST

Figure 5: Minimum configuration A2100-A

NOTE: It is recommended to supply Vcc continuously! Use SiRFaware

other low power modes to reduce power consumption of the module while no

position information is required.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 36 37

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