PD17012GF-058_15 Datasheet, PDF (54/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
3. ALARM FUNCTION
The alarm function is provided as a means of preventing car theft. If the alarm system detects anyone other than
the user entering the car, a warning sound is generated.
3.1 Overview of the Alarm Function
• When alarm mode is off
The door is
opened
The ignition switch
is turned on
The signal indicating
an open door is
recognized.
The IGNITION pin
becomes high.
Alarm mode is
released
• When alarm mode is on
The door is
opened
Entry time
elapses
When the ignition
switch is turned on
An alarm is
generated
Alarm mode is
released
The signal indicating
an open door is
recognized.
If the ignition switch
is not turned on
within entry time
A beep is output
from the BEEP
pin with electronic
volume output
maximized.
Reset time
elapsed
Power-on
enabled state
Power-on
enabled state
Power is
turned off
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