V2.0 – Jan-13
User’s Manual
Page 14 of 41
3 Quick Start
In order to allow an easy and quick start with the A2100-A module, this chapter pro-
vides a short overview on the important steps to be taken to receive NMEA mes-
sages 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 output of
a microprocessor. For a wake-up, including the initial one after power on, a
LOW-HIGH transmission is mandatory.
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
Tx
Rx
GND
3.3V
ANT_EXT
ANT_GND
Vcc
Shown from top without lid; pads shown for better understanding
Pin 1
marker
10k
Ω
nRST
A2100-A
GSD4e
UART
ON_OFF
Tx
Rx
GND
3.3V
ANT_EXT
ANT_GND
Vcc
Shown from top without lid; pads shown for better understanding
Pin 1
marker
10k
Ω
nRST
Figure 5: Minimum configuration A2100-A
NOTE
: It is recommended to supply Vcc continuously! Use SiRFaware
TM
or
other low power modes to reduce power consumption of the module while no
position information is required.
NOTE
: Care must be taken to implement an orderly shut-down sequence along
with supplying power for a certain period of time after initiating the shut-down
sequence. Abrupt removal or drop of power while the module is running has
