
4–56
Motorola Sensor Device Data
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TIMING PARAMETERS
(C = 0.1
μ
F, Rbias = 8.2 M
, VDD = 9.0 V, TA = 25
°
C, See Figure 6)
Characteristics
Symbol
Min
Max
Units
Oscillator Period
No Smoke
Smoke
tCI
1.46
37.5
1.85
45.8
s
ms
Oscillator Rise Time
tr
10.1
12.3
ms
Horn Output
(During Smoke)
On Time
Off Time
PWon
PWoff
450
450
550
550
ms
ms
LED Output
Pulses
Between
On Time
tLED
PWon
35.0
10.1
44.5
12.3
s
ms
Horn Output
(During Low Battery)
Pulses
On Time
Between
ton
toff
10.1
35.0
12.3
44.5
ms
s
Figure 1. Block Diagram
+
–
VDD
LATCH
LOW BATTERY COMP.
OSCILLATOR
TIMER
LATCH
+
–
VDD
80 K
3
1045 K
7
12
1
13
1125 K
+
–
15
DETECT INPUT
14
LO–Z
ACTIVE
GUARD
16
HI–Z
VDD
4
VDD
8
PIEZOELECTRIC
HORN DRIVER
11
10
5
LED DRIVER
VDD
6
9
F
Freescale Semiconductor, Inc.
n
.