Antenna; Gsm; Gps; Figure 12 - Gps Antenna Sample Schematic - Enfora Enabler LPP G Integration Manual

6.4. Power Button and Status LED
The power button is polled once per second. Once the power button press is detected, the
signal is debounced using Timer A. The button must be held for three (3) seconds to deactivate
the device. Once sufficient button press and hold occurs, the status LED is enabled for three (3)
seconds. If the modem is on at the time of deactivation, the status LED on-time is extended until
the modem turns off. Next the system enters LPM4 mode and the unit is deactivated.
The MSP exits LPM4 mode when the button is pressed again. The button signal is debounced
again using Timer A. The button must be held for three (3) seconds to activate the device. If the
button is not held long enough, the system re-enters LPM4. Once sufficient button press and
hold occurs, the status LED blinks (four times per second) for three seconds. The system is now
activated.

6.5. Antenna

The LPP0108 module has two RF antenna connections. One connection is for the GSM
section of the module and the other for GPS. Please be sure to follow proper RF design
practices when designing the antennas.

6.5.1. GSM

A GSM antenna should be designed from proper RF design practices.

6.5.2. GPS

The GPS_ANT is the RF connection from the GPS antenna; no external LNA is required. The
LPP0108 can support both passive and active GPS antenna. However, external power supply
and circuitry is required for an active GPS antenna. See Figure 12 - GPS Antenna Sample
Schematic
Active antenna is enabled by placing a jumper on J403 in the sample schematic between pins
1 and 2.
LPP0108IG001

Figure 12 - GPS Antenna Sample Schematic

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Version - Preliminary – 06/20/08