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Hardware Description
3.4.3
Turning the Unit On Using the Ignition Pin
An alternative way to power-up the module is to connect the Ignition line to a 12 V input (for example, a car battery). Releasing
the Ignition line causes the module to power-down after a timeout period defined by flex, provided that the module is not in the
midst of a call and that no keys have been pressed. If the module was involved in a call, the module turns off after a timeout
period defined by flex, after the call ends.
The c18 module does not enter power-save modes when the Ignition line is asserted high.
Note
The Ignition line is used to turn on the c18 unit, and is primarily used for units connected to a mobile device, where current
consumption is not a major concern. When the Ignition line rises, the unit turns on. The Ignition line is also used to turn the unit
on when power is connected to the unit (for example, the Ignition line in a car kit).
For proper Ignition line functioning, c18 VCC must be 4.0V or higher. Proper Ignition line functioning is not
guaranteed at less than 4.0V VCC.
Note
3.5
SLEEP MODE OPTIONS
This section describes c18 Sleep mode options.
3.5.1
c18 Awakens the DTE from Sleep Mode
In order to awaken the DTE from Sleep mode (or to block the DTE from entering Sleep mode), the c18 (DCE) changes its
WAKE_OUT line state prior to sending data, thereby prompting the DTE to exit Sleep mode. The following compatibility issues
apply:
• For g18 compatibility:
To wake up the DTE, the c18 changes the WAKE_UP line state to low for the time interval designated by the ATS102
command (the default is 30 ms). After that time, the WAKE_UP line changes its state back to IDLE (high). See Figure 8 for
reference.
• Pin assignments:
• g18:
• In the g18, the WAKE_OUT and WAKE_IN functions are on the same physical line called WAKE_UP.
• On the 36-pin connector, the WAKE_UP pin is J10-15.
• On the 28-pin connector, the WAKE_UP pin is J11-9.
• On the 70-pin connector, WAKE_UP function goes to the WAKE_IN_N pin J1-16.
• On the 70-pin connector, WAKE_OUT_N pin J1-26 is not functional.
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98-08901C63-A
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