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參數(shù)資料
| 型號(hào)： | M75012 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT |
| 中文描述： | 光電感煙探測(cè)器與互連 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 177K |
| 代理商： | M75012 |
2/10
2006-10-05
PHOTOELECTRIC SMOKE DETECTOR
WITH INTERCONNECT
SMOKE DETECTOR
M75012
一華半導(dǎo)體股份有限公司
MOSDESIGN SEMICONDUCTOR CORP.
ABSOLUTE MAXIMUM RATING
Parameter
Sym.
Rating
-0.5 ~ 13
-0.3 to V
DD
+
0.3
10
-25 ~ 75
-55 to 125
Unit
V
V
mA
℃
℃
Supply Voltage Range
Input Voltage Range
Input Current
Operating Temperature Range
Storage Temperature Range
V
DD
V
IN
I
IN
T
A
T
S
PIN AND CIRCUIT DESCRIPTION
Pin No
Pin Name
Description
1
C1
A capacitor connected to this pin determines the gain of the photo amplifier during the push-to-test mode
and during the chamber monitor test. A typical value for this high-gain mode is 0.047
μ
F but should be
selected based on the photo chamber background reflections reaching the detector and the desired level of
sensitivity. Ae
≒
1 + ( C1 / 10 ) where C1 is in pF. Ae should not exceed 10,000.
2
C2
A capacitor connected to this pin determines the gain of the photo amplifier during standby. A typical value
for this low-gain mode is 4700 pF but should be selected based on a specific photo chamber and the
desired level of sensitivity to smoke. Ae
≒
1 + ( C2 / 10 ) where C2 is in pF. Ae should not exceed
10,000.
3
DETECT
This is the input to the photo amplifier and is connected to the cathode of the photo diode. The photo diode
is operated at zero bias and should have low darkleakage current and low capacitance.
4
STROBE
This output provides a strobed , regulated voltage of VDD-5V. The minus side of all internal and external
photo amplifier circuitry is referenced to this pin.
5
VDD
This pin is connected to the most-positive supply potential and can range from 6V to 12V with respect to
VSS.
6
IRED
This output provides a pulsed base current for the external NPN transistor , which drives the IR emitter. Its
beta should be greater than 100. The IRED output is not active , to minimize noise impact , when the horn
and visible LED outputs are active.
7
I/O
A connection at this pin allows multiple smoke detectors to be interconnected. If a local smoke condition
occurs , this pin is driven high. As an input , this pin is sampled nominally every 1.35 seconds during
standby. Any local-alarm condition causes this pin to be ignored as an input.
An internal NMOS device acts as a charge dump to aid in applications involving a large ( distributed )
capacitance. The charge dump is activated at the end of local or test alarm. This pin also has an on-chip
pull-down resistor and must be left unconnected if not used. In application , there is a series current-
limiting resistor to other smoke alarms.
8
HORN1
9
HORN2
10
FEEDBACK
These three pins are used in conjunction with external passive components and a self-resonating
piezoelectric transducer. HORN1 is connected to the piezo metal support electrode ; the complementary
output , HORN2 , is connected to the ceramic electrode and the FEEDBACK input to the feedback
electrode.
A continuous modulated tone indicates either a local or remote alarm condition. A short ( 10ms ) chirp
indicates a low-battery chirp occurs almost simultaneous with the visible LED flash. If the FEEDBACK
pin is not used , it must be connected to VDD or VSS.
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