MC145012 Просмотр технического описания (PDF) - Freescale Semiconductor
Номер в каталоге
Компоненты Описание
Список матч
MC145012
Freescale Semiconductor
MC145012 Datasheet PDF : 14 Pages
| |||
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 = 7.5 MΩ).
No.
Parameter
1 Oscillator Period
2 LED Pulse Period
Symbol
Test Condition
1/FOSC Free-Running Sawtooth
Measured at Pin 12
TLED
No Local Smoke, and
No Remote Smoke
Clocks
1.0
Min (6)
7.0
Typ (7)
7.9
Max(6)
8.6
Unit
ms
4096
28.8
32.4
35.2
s
3
Remote Smoke, but
—
Extinguished
No Local Smoke
4
Local Smoke
64
0.45
—
—
5
6 LED Pulse Width and Strobe
Pulse Width
7 IRED Pulse Period
8 IRED Pulse Period
Push-button Test
TW(LED),
TW(STB)
TIRED
TIRED
Smoke Test
Chamber Sensitivity Test,
without Local Smoke
64
1.0
1024
4096
0.45
—
7.0
—
—
8.6
ms
7.2
8.1
8.8
s
28.8
32.4
35.2
s
9
10 IRED Pulse Width
11 IRED Rise Time
12 IRED Fall Time
13 Silver and Brass Temporal
Modulation Pulse Width
14
15
16 Silver and Brass Chirp Pulse
Period
17 Silver and Brass Chirp Pulse
Width
18 Rising Edge on I/O to Smoke
Alarm Response Time
19 Strobe Out Pulse Period
20
Push-button Test
TW(IRED)
TR
TF
TON
TOFF
TOFFD
TCH
Low Supply or Degraded
Chamber Sensitivity
TWCH
TRR
TSTB
Remote Smoke,
No Local Smoke
Smoke Test
Chamber Sensitivity Test,
without Local Smoke
128
TF*
—
—
64
192
4096
1
—
1024
4096
0.9
1.0
1.1
94
—
116
µs
—
—
30
—
—
200
µs
0.45
0.5
0.55
s
0.45
0.5
0.55
1.35 1.52 1.65
28.8
32.4
35.2
s
7.0
7.9
8.6
ms
—
2.0 (8)
—
s
7.2
8.1
8.8
s
28.8 32.4 35.2
21
Low Supply Test,
4096
28.8 32.4 35.2
without Local Smoke
22
Push-button Test
—
—
1.0
—
Notes
6. Oscillator period T (= Tr + Tf) is determined by the external components R1, R2, and C3 where TR = (0.6931) R2 C3 and TF = (0.6931) R1 *
C3. The other timing characteristics are some multiple of the oscillator timing as shown in the table. The timing shown should accommodate
the NFPA 72, ANSI S3.41, and ISO 8201 audible emergency evacuation signals.
7. Typicals are not guaranteed.
8. Time is typical - depends on what point in cycle signal is applied.
Sensors
Freescale Semiconductor
MC145012
5
Share Link: