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參數(shù)資料
| 型號： | MC145018P |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 0K |
| 描述： | IC SMOKE DETECT PHOTOELEC 16-DIP |
| 標準包裝： | 25 |
| 類型： | 煙霧探測器 |
| 輸入類型： | 離子化 |
| 輸出類型： | 電壓 |
| 電流 - 電源： | 12µA |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-PDIP |
| 包裝： | 管件 |
Sensors
Freescale Semiconductor
5
MC145018
Archived by Freescale Semiconductor, Inc., 2009
Archive
Information
Archive
Information
enabled. The horn output is modulated 500 ms on, 500 ms
off. During the off time, smoke is again checked and will
inhibit further horn output if no smoke is sensed. During local
smoke conditions the low battery alarm is inhibited, but the
LED pulses at a 1.0 Hz rate. In remote smoke, the LED is
inhibited as well.
An active guard is provided on both pins adjacent to the
detect input. The voltage at these pins will be within 100 mV
of the input signal. This will keep surface leakage currents to
a minimum and provide a method of measuring the input
voltage without loading the ionization chamber. The active
guard op amp is not power strobed and thus gives constant
protection from surface leakage currents. Pin 15 (the Detect
input) has internal diode protection against static damage.
Interconnect
The I/O (Pin 2), in combination with VSS, is used to
interconnect up to 40 remote units for common signaling. A
Local Smoke condition activates a current limited output
driver, thereby signaling Remote Smoke to interconnected
units. A small current sink improves noise immunity during
non-smoke conditions. Remote units at lower voltages do not
draw excessive current from a sending unit at a higher
voltage. The I/O is disabled for three oscillator cycles after
power up, to eliminate false alarming of remote units when
the battery is changed.
Sensitivity/Low Battery Thresholds
Both the sensitivity threshold and the low battery voltage
levels are set internally by a common voltage divider (see
Figure 2) connected between VDD and VSS. These voltages
can be altered by external resistors connected from pins 3 or
13 to either VDD or VSS. There will be a slight interaction
here due to the common voltage divider network. The
sensitivity threshold can also be set by adjusting the smoke
chamber ionization source.
Test Mode
Since the internal op amps and comparators are power
strobed, adjustments for sensitivity or low battery level could
be difficult and/or time-consuming. By forcing Pin 12 to VSS,
the power strobing is bypassed and the output, Pin 1,
constantly shows smoke/no smoke. Pin 1 = VDD for smoke.
In this mode and during the 10 ms power strobe, chip current
rises to approximately 50
μA.
LED Pulse
The 9-volt battery level is checked every 40 seconds
during the LED pulse. The battery is loaded via a 10 mA
pulse for 11.6 ms. If the LED is not used, it should be replaced
with an equivalent resistor such that the battery loading
remains at 10 mA.
Hysteresis
When smoke is detected, the resistor/divider network that
sets sensitivity is altered to increase sensitivity. This yields
approximately 100 mV of hysteresis and reduces false
triggering.
Figure 6. Typical Application as Ionization Smoke Detector
To
Other
Units
MC145018
116
2
3
4
5
6
7
8
15
14
13
12
11
10
9
330
Ω
8.2 M
Ω
+
9 V
0.1
μF
1.5 M
Ω*
0.001
μF
220 k
Ω*
0.1
μF
1 M
TEST
*NOTE: Component values may change
depending on type of
piezoelectric horn used.
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