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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
6 FUNCTIONAL DESCRIPTION
6.1 Switching on / off
To switch the radio on, areset pulse must be applied to the microcontroller. The software willthen perform
a number of checks, and may either turn on all voltages, or switch the radio off again.
With a bad battery, the voltage may drop so far that the "HOLD" output of the voltage stabilizer goes low,
e.g. during starting of the cars engine, and the radio switches off. The radio will switch on immediately
when the voltage returns to a normal value.
If the radio was previously switched off by turning the ignition off, it will switch on when the ignition key is
turned on again.
The radio can also be switched on with the power key while ignition is off. In that case a sleep timer is
started that turns the radio off after 60 minutes unless ignition is switched on in the mean time.
The table below shows the differences between the static on/off switch and the momentary power key.
Option Pin or key Switch on Switch off
Momentary
on/off key
Power key
IGN pin
Power key pressed.
When previous switched off
by IGN.
Power key pressed.
When IGN pin goes low.
After 60 minutes when
switched on by power key
while IGN pin was low.
Static on/off
switch
Static
switch
When switch is closed. When switch is open.
Valid for
both
Power
supply
Detachable
keyboard
When power supply is OK
again.
When a power failure is
detected.
When keyboard is removed.
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