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Chapter 2: Hardware Interface Description
Antenna Detection
The C24 incorporates an internal antenna detection circuit, which senses the physical connection
and removal of an antenna or antenna circuit on the C24 antenna connector. The antenna
detection state is reported to the application through the ANT_DET output signal, and may also
be queried by the ATS97 command.
The detection circuit senses DC resistance to ground on the C24 antenna connector.
A DC resistance below 100kohm (+10%) is defined as a valid antenna connection, and the
ANT_DET output signal is set high.
CDMA Network Indicator
The CDMA output signal indicates the network CDMA connection status. When C24 is
connected to a CDMA network, this signal is enabled. When C24 is not connected to the CDMA
network this signal is disabled.
Transmission Indicator
The TXEN_N output signal indicates when C24 is transmitting over the CDMA network. This
signal is set low during transmission, and set high when no transmission is in progress.
General Purpose I/O
The C24 incorporates 8 general purpose IO signals for the user application. Each GPIO signal
may be configured and controlled by AT command. These signals may be used to control or set
external application circuits, or to receive indications from the external application.
December 15, 2008
C24 Module Hardware Description
43
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