Applicant: Motorola, INC
2.3 Power On/Off Operation
The Module power on and off process includes two primary phases, which are indicated at the interface
connector by the hardware output signals RESET_N and CTS_N.
The RESET_N signal indicates whether the module is powered on or off.
When this signal is enabled (low), the module is powered-off. When it is disabled (high), the module is
The CTS_N signal indicates the serial communications interface (UART) status.
When this signal is high, the module serial interface is tri-stated. When it is low, the serial interface is
enabled, and the module is ready to communicate.
These same conditions apply to the CTS2_N signal with respect to the second serial interface (UART2).
TABLE 4 – On-Off control signals
Turning the module On
When the module power supply is stable above the minimum operating level and it is powered off, it
operates in RTC mode, with only the internal RTC timer active.
The C-lite consist of two HW models: basic (without charger), and charger.
The basic module will power on when the ON_N signal or IGN signal is asserted.
The ON_N and IGN signals will be active and responding only after the power supply to the module is
stable at operating level.
The charger module will power on when the ON_N signal or valid charger input voltage level is asserted
(see "Charger Connectivity" section).
The ON_N (IGN signal is used as Charger input voltage) signal will be active and responding only after
the power supply to the module is stable at operating level.
An internal pull-up resistor sets the ON_N input signal high whenever a power supply is applied to the
Asserting the ON_N signal low for a minimum of 200 milliseconds (0.2 seconds) will cause the module to
The following figure illustrates the power-on process using the ON_N signal.
On - Off Logic level control
On - Off toggle control
Turning on the module using ON_N
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C24 Hardware Interface Manual