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MC145010 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc

Part No. MC145010
Description  Photoelectric Smoke Detector IC with I/O
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC145010 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc

 
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Sensors
4
Freescale Semiconductor
MC145010
Table 3. AC Electrical Characteristics
Reference Timing Diagram Figure 6 and Figure 7. (TA = 25°C, VDD = 9.0 V, Component values from Figure 8: R1 = 100.0 KΩ,
C3 = 1500.0 pF, R2 = 10.0 M
Ω.)
No.
Characteristics
Symbol
Clocks
Min
Max
Unit
1
Oscillator Period(1)
Free-Running Sawtooth Measured at Pin 12
1. Oscillator Period T (= Tr + Tf) is determined by the external components R1, R2, and C3 where Tr = (0.6931) R2 x C3 and
Tf = (0.6031) R1 x C3.
The other timing characteristics are some multiple of the oscillator timing shown in the table.
1/fOSC
1
9.5
11.5
ms
2
3
4
LED Pulse Period
No Local Smoke, and No Remote Smoke
Remote Smoke, but No Local Smoke
Local Smoke or Push Button Test
tLED
4096
64
38.9
0.60
47.1
0.74
s
5
LED Pulse Width and Strobe Pulse Width
tw(LED),
tw(STB)
1
9.5
11.5
ms
6
7
8
IRED Pulse Period
Smoke Test
Chamber Sensitivity Test without Local Smoke
Push Button Test
tIRED
1024
4096
32
9.67
38.9
0.302
11.83
47.1
0.370
s
9
IRED Pulse Width
tw(IRED)
Tf1
94
116
µs
10
IRED Rise Time
IRED Fall Time
tr
tf
30
200
µs
11
Silver and Brass Modulation Period
Local or Remote Smoke
tMOD
297
363
ms
11
12
Silver and Brass Duty Cycle
Local or Remote Smoke
tON/tMOD
73
77
%
13
Silver and Brass Chirp Pulse Period
Low Supply or Degraded Chamber Sensitivity
tCH
4096
38.9
47.1
s
14
Silver and Brass Chirp Pulse Width
Low Supply or Degraded Chamber Sensitivity
tw(CH)
1
9.5
11.5
ms
15
Rising Edge on I/O to Smoke Alarm Response Time
Remote Smoke, No Local Smoke
tRR
800
ms
16
17
18
19
Strobe Out Pulse Period
Smoke Test
Chamber Sensitivity Test without Local Smoke
Low Supply Test without Local Smoke
Push Button Test
tSTB
1024
4096
4096
9.67
38.9
38.9
0.302
11.83
47.1
47.1
0.370
s


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