Enfora Enabler III-G
Modem Integration Guide
6.6. Control Connector Signal Descriptions and Functions
Please note that the following descriptions are intended to
provide hardware-level definitions. In some cases, specific
lines will have no firmware functionality implemented.
Information for each hardware-specific feature will be noted
in the appropriate section.
6.6.1. Module Power (Pins 85, 87, 79, 91, 93, 95, 97, 99)
The Enfora Enabler III-G module uses a single voltage source of VCC=+3.3V to 4.5V. (The
exact values of the uplink currents are shown in Tables5.3.1 GSM Operating Power and
5.3.2 GPRS Operating Power).
V
BAT
Parameter/Conditions Min
Typ
Max
Units
Main Battery Supply
Voltage In Regulation
3.3
4.5
Vdc
Peak Current
1000
μ
F on Host at Module
Connector
mA
The uplink burst will cause strong ripple on the voltage
lines and should be effectively filtered. It is recommended
that 1000 to 2000
μ
F of capacitance be placed as close to
the modem I/O connector as possible.
It should be noted that the input voltage level should not
drop below the minimum voltage rating under any
circumstances, especially during the uplink burst period.
6.6.2. Ring Indicate
The Enabler III-G module is capable of using the Ring line to discern the type of incoming
call. The indicator can be monitored via a hardware line available on the 100-pin I/O signal
connector. The Ring Indicator pin is #49.
The function of the Ring line depends on the type of the call received.
When the module is receiving a
voice call,
the Ring line goes low for 1 second and high for
another 2 seconds. Every 3 seconds the ring string is generated and sent over the Receive
(Data Out) (Rx) line. If there is a call in progress and call waiting is activated for a connected
handset or hands free device, the Ring pin switches to ground in order to generate acoustic
signals that indicate the waiting call.
GSM0308PB001
31
Version DRAFT – 2/9/2007
