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| 型号： | MC145018P |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC SMOKE DETECT PHOTOELEC 16-DIP |
| 标准包装： | 25 |
| 类型： | 烟雾探测器 |
| 输入类型： | 离子化 |
| 输出类型： | 电压 |
| 电流 - 电源： | 12µA |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
Sensors
4
Freescale Semiconductor
MC145018
Archived by Freescale Semiconductor, Inc., 2009
Archive
Information
Archive
Information
Figure 3. Typical LED Output I-V Characteristic
Figure 4. Typical Comparator Output I-V Characteristic
Figure 5. Typical P Horn Driver Output I-V Characteristic
DEVICE OPERATION
Timing
The internal oscillator of the MC145018 operates with a
period of 1.65 seconds during no-smoke conditions. Each
1.65 seconds, internal power is applied to the entire IC and a
check is made for smoke, except during LED pulse, Low
Battery Alarm Chirp, or Horn Modulation (in smoke). Every 24
clock cycles a check is made for low battery by comparing
VDD to an internal zener voltage. Since very small currents
are used in the oscillator, the oscillator capacitor should be of
a low leakage type.
Detect Circuitry
If smoke is detected, the oscillator period becomes
41.67 ms and the piezoelectric horn oscillator circuit is
Table 4. Timing Parameters
(C = 0.1
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
On Time
(During Smoke)
Off Time
PWON
PWOFF
450
550
ms
LED Output
Between Pulses
On Time
tLED
PWON
35.0
10.1
44.5
12.3
s
ms
Horn Output
On Time
(During Low Battery)
Between Pulses
tON
tOFF
10.1
35.0
12.3
44.5
ms
s
VDS, Drain To Source Voltage (VDC)
0
1
234
5
6
7
8
9
10
0.1
1.0
10.0
100.0
VDD = 9.0 VDC
I D
,D
rain
C
urre
nt
(m
A)
VDD = 7.2 VDC
TA = 25°C
VDS, Drain To Source Voltage (VDC)
01
2
3
4
5
6
7
8
9
10
0.01
0.1
1.0
10.0
VDD = 9.0 VDC or 7.2 VDC
TA = 25°C
P-CH Source
and N-CH
Sink Current
I D
,Dr
ain
Cu
rren
t(m
A)
0
1
234
5
6
7
8
9
10
1.0
10.0
100.0
1000.0
TA = 25°C
VDS, Drain To Source Voltage (Vdc)
N-CH SInk Current
VDD = 7.2 Vdc
VDD = 9.0 Vdc
0
1
2
3
4
5
678
9
10
1.0
10.0
100.0
1000.0
I D
,Dr
ai
nCurr
ent
(m
A)
TA = 25°C
VDS, Drain To Source Voltage (Vdc)
P-CH Source Current
VDD = 7.2 Vdc
VDD = 9.0 Vdc
I D
,D
rain
C
urr
ent
(mA
)
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