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参数资料
| 型号： | MC145012P |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 14/14页 |
| 文件大小： | 0K |
| 描述： | IC SMOKE DETECTOR WITH I/O 16DIP |
| 标准包装： | 25 |
| 类型： | 烟雾探测器 |
| 输入类型： | 光电 |
| 输出类型： | 电压 |
| 电流 - 电源： | 8µA |
| 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
Freescale Semiconductor
9
MC145012
Figure 8. Typical Battery-Powered Application
Table 4. Pin Description
Pin No.
Pin Name
Description
1
C1
A capacitor connected to this pin as shown in Figure 8 determines the gain of the on-chip photo amplifier during push-
button test and chamber sensitivity test (high gain). The capacitor value is chosen such that the alarm is tripped from
background reflections in the chamber during push-button test.
Av ≈ 1 + (C1/10) where C1 is in pF. CAUTION: The value of the closed-loop gain should not exceed 10,000.
2
C2
A capacitor connected to this pin as shown in Figure 8 determines the gain of the on-chip photo amplifier except during
push-button or chamber sensitivity tests.
Av ≈ 1 + (C2/10) where C2 is in pF. This gain increases about 10% during the IRED pulse, after two consecutive local
smoke detections.
Resistor R14 must be installed in series with C2. R14
≈ [1/(12√C2)] - 680 where R14 is in ohms and C2 is in farads.
3
DETECT
This input to the high-gain pulse amplifier is tied to the cathode of an external photodiode. The photodiode should have
low capacitance and low dark leakage current. The diode must be shunted by a load resistor and is operated at zero
bias.
The Detect input must be AC/DC decoupled from all other signals, VDD, and VSS. Lead length and/or foil traces to this
pin must be minimized, also. See Figure 9.
D2
IR Detector
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TEST
LOW-SUPPLY
TRIP
VSS
R1
OSC
LED
FEEDBACK
SILVER
VDD
IRED
I/O
BRASS
STROBE
DETECT
C1
C2
Horn
X1
To Other
MC145012(s),
Escape Light(S),
Auxiliary Alarm(S),
Remote Alarm(S),
And/or Auto-dialer
IR
Current
4.7 TO 22
Q1
2.2 M
D4
Visible
LED
R7
47 k
R6
100 k
SW1
+
MC145012
Reverse
Polarity
Protection
Circuit
Pushbutton
Test
R2
7.5 M
0.01
F
C6(9)
C3
1500 pF
R1
100 k
R3
470
R4(9)
100 k
9 V
B1
D1
1 TO 22
F
C1
0.047
F
4700 pF
R14
560
R11 250 k
R8
8.2 k
5 k
R10
4.7 k
D3
IR Emitter
R12
1 k
C5
100
F
9. Values for R4, R5, and C6 may differ depending on type of piezoelectric horn used.
10.C2 and R13 are used for coarse sensitivity adjustment. Typical values are shown.
11.R9 is for fine sensitivity adjustment (optional). If fixed resistors are used, R8 = 12 k, R10 is 5.6 k to 10 k, and R9 is eliminated.
When R9 is used, noise pickup is increased due to antenna effects. Shielding may be required.
12.C4 should be 22
F if B1 is a carbon battery. C4 could be reduced to 1 F when an alkaline battery is used.
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