Power-Down - Panasonic G600 Technical Manual

9.3.2 Power-up Sequence
The power-up sequence can be initiated by pressing the power key or by the presence of an external power source
on the signal EXT_PWR. Both enable the linear regulators and the CPU becomes active. The CPU must then
check the battery condition; if the phone is not required to power-down or sleep immediately, the result must be OK
or LOW. The CPU then checks to see if a hands-free unit is connected by polling the nHF_SENSE signal, LOW
when HF is connected.
Now the CPU can make the decision whether to remain powered-up or not according to the truth-table below. In
each case the active parameters are shaded.
Battery
condition
OK
LOW
OK or LOW
OK
LOW
With a hands-free, the phone can be configured via the MMI to power-up and down with transitions of the vehicle
ignition. These are sensed by the CPU on nIGNITION, LOW when the ignition is on.
Any other state than those in the table will cause the phone to deactivate the PSU by setting STAY_ALIVE LOW.
While the CPU is active, it must monitor the battery condition and accessory connectivity and change state
accordingly.
Current mode
charge
charge
restricted
9.4

Power-down

There are two power-down procedures;
Normal power-down
Emergency power-down
The truth-table for the power state transitions are shown below, the cause of a transition is shaded. In some cases
the phone does not power down completely but may enter a state of reduced functionality e.g. from active to
charge mode.
When the new mode is OFF or sleep, the CPU will set STAY_ALIVE LOW.
MCUK980101G8
Technical Guide
http://cxema.ru
HF EXT_PWR_SENSE
X X
X >1.2V
no >1.2V
yes >1.2V
yes >1.2V
HF EXT_PWR_SENSE
X X
X 1.2V
X X
In this case, the software has full control over the power-down procedure. Calls can
be terminated gracefully etc. In some cases the PSU is not deactivated but there is a
change of operating mode
This situation is caused by battery removal and is flagged by EXTINT. In this case
the CPU only has time to perform a subset of the normal procedure. The priority is to
prevent corruption of SIM data
nIGNITION KBR0
X 1
X 1
X 0
<0.5V 0
<0.5V 0
nIGNITION KBR0
X 1
X 1
X 0
Section 9
9 - 3
POWER SUPPLIES
LOGIC_PWR Mode
1 active
1 restricted
1 charge
1 active or charge
1 restricted or charge
Battery
New mode
condition
OK active
LOW restricted
OK active
Issue 1
Revision 0