Technical information

Controls and Indicators Interface
42 G24-L Module Hardware Description November 15, 2008
Controls and Indicators Interface
The G24-L incorporates several interface signals for controlling and monitoring the module's
operation. The following paragraphs describes these signals and their operation.
Table 2-20 gives a description of the controls and indicators signals.
Reset
The RESET_N output signal indicates the G24's operating status. This signal is set high after
power up, when G24-L is operating. It is set low when G24-L is powered off.
When the RESET_N signal is low, the G24-L interface signals are disabled and do not represent
any valid data or state. Furthermore, any input signals connected to the G24-L interface must be
disabled (tri-state) or set low when RESET_N is low.
Important: During SW programming, the RESET_N signal state is not valid and may be set
low or toggled by the module.
VREF Reference Regulator
The G24-L incorporates a regulated voltage output, VREF. The regulator provides a 2.8V output
for use by the customer application. This regulator can source up to 150 mA of current to power
any external digital circuits.
Table 2-20:
Controls and Indicators
Connector Pin Signal Name Description
25 RESET_N G24-L system reset output indicator.
When high, G24-L is operating.
27 VREF 2.80V regulated output.
Supplies external circuits up to
150mA.
26 WKUPO_N Host application wake-up signal indi-
cator.
41 ANT_DET Antenna physical connection detect
indicator.
49 GPRS/GSM Network status indicator.
39 TXEN_N Transmission burst indication.
28, 30, 32, 34, 36,
38, 40, 42
GPIO 1-8 General purpose IO signals for cus-
tomer use.