Power On/Off Operation; Turning The G24 On; Power Supply Turn-On - Motorola G24 Developer's Manual

Power On/Off Operation

Power On/Off Operation
The G24 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 G24 is powered on or off.
When this signal is enabled (low), G24 is powered-off. When it is disabled (high), G24 is
powered-on.
The CTS_N signal indicates the serial communications interface (UART) status. When this signal
is high, the G24 serial interface is disabled. When it is low, the serial interface is enabled, and
G24 is ready to communicate.
These same conditions apply to the CTS2_N signal with regards to the second serial interface
(UART2).
Important:

Turning the G24 On

When the G24 power supply is stable above the minimum operating level and G24 is powered
off, the PMIC operates at low power mode, with only the RTC timer active. G24 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 G24
is stable above the minimum operating level. Therefore, the ON_N and IGN signals must not be
used for at least 100 milliseconds after applying power to G24.

Power Supply Turn-on

When connecting the power supply for the first time, or when reconnecting it after a power
supply loss, G24 will power-on. The PMIC, and consequently G24, are turned-on automatically
when external power is applied above the minimum operating level.
The PMIC, and consequently G24, will power-off after 900 milliseconds, also automatically, in
case the ON_N or IGN signals are not asserted to initiate a power on, during that period.
If the ON_N or IGN signals are asserted during that period, G24 will respond accordingly and
continue to power-up normally.
14
Do not operate the G24 out of its electrical or environmental limits. Refer to the
specifications chapter for details of these limits.
Module Hardware Description January 1, 2006