24
DPS70
Gauge Area
7.3. Buzzer
The DPS70 has a rear facing piezo transducer. It has two volume settings and
frequency control. The volume is controlled by adjusting the duty cycle with 25%
being low volume and 75% being high volume.
The following table provides specifications for the DPS70's buzzer:
Buzzer Specifications
Item
Min
Nom
Max
Unit
Resonant frequency
2900
3400
3900
Hz
Sound pressure level @ 10 cm
(note 1)
110
dBa
Voltage
1
12
36
V
Operating temperature range
-40
+85
°C
Storage temperature range
-40
+85
°C
Note 1: SPL at resonant frequency with product not installed in vehicle and the distance is off the rear cover.
7.4. Real Time Clock
The real time clock is incorporated in the gauge co-microprocessor. The primary
power for the clock is from the direct battery connection. If the direct battery
connection is not present, power is supplied by the lithium backup battery in the
unit. The backup battery is 3 V 1000 mAh. Minimum lifetime is 10 years when
disconnected from the vehicle battery.
