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參數(shù)資料
| 型號： | MCZ145011DW |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Photoelectric Smoke Detector IC with I/O For Line-Powered Applications |
| 中文描述： | 光電感煙探測器芯片與I /線路O型供電應(yīng)用 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大小： | 253K |
| 代理商： | MCZ145011DW |
Sensors
Freescale Semiconductor
5
MC145011
4
STROBE
This output provides a strobed, regulated voltage referenced to V
DD
. The temperature coefficient of this voltage is
±
0.2%
°
C maximum from - 10
°
to 60
°
C. The supply-voltage coefficient (line regulation) is
±
0.2%/V maximum from 6 to
12 V. Strobe is tied to external resistor string R8, R9, and R10.
5
VDD
This pin is connected to the positive supply potential and may range from + 6 to + 12 V with respect to V
SS
.
This output provides pulsed base current for external NPN transistor Q1 used as the infrared emitter driver. Q1 must
have
β
≥
100. At 10 mA, the temperature coefficient of the output voltage is typically + 0.5%/
°
C from - 10
°
to 60
°
C. The
supply-voltage coefficient (line regulation) is
±
0.2%/V maximum from 6 to 12 V. The IRED pulse width (active-high) is
determined by external components R1 and C3. With a 100 k
/1500 pF combination, the nominal width is 105
μ
s.
To minimize noise impact, IRED is not active when the visible LED and horn outputs are active. IRED is active near the
end of Strobe pulses for Smoke Tests, Chamber Sensitivity Test, and Push button Test.
6
IRED
7
I/O
This pin can be used to connect up to 40 units together in a wired-OR configuration for common signaling. V
SS
is used
as the return. An on-chip current sink minimizes noise pick up during non-smoke conditions and eliminates the need for
an external pull-down resistor to complete the wired-OR. Remote units at lower supply voltages do not draw excessive
current from a sending unit at a higher supply voltage.
I/O can also be used to activate escape lights, auxiliary alarms, remote alarms, and/or auto-dialers.
As an input, this pin feeds a positive-edge-triggered flip-flop whose output is sampled nominally every 625 ms during
standby (using the recommended component values). A local-smoke condition or the push button-test mode forces this
current-limited output to source current. All input signals are ignored when I/O is sourcing current.
If unused, I/O must be left unconnected.
8
BRASS
This half of the push-pull driver output is connected to the metal support electrode of a piezoelectric audio transducer
and to the horn-starting resistor. A continuous modulated tone from the transducer is a smoke alarm indicating either
local or remote smoke. A short beep or chirp is a trouble alarm indicating a low supply or degraded chamber sensitivity.
9
SILVER
This half of the push-pull driver output is connected to the ceramic electrode of a piezoelectric transducer and to the
horn-starting capacitor.
10
FEEDBACK
This input is connected to both the feedback electrode of a self-resonating piezoelectric transducer and the horn-starting
resistor and capacitor through current-limiting resistor R4. If unused, this pin must be tied to VSS or VDD.
11
LED
This active-low open-drain output directly drives an external visible LED.
The load for the low-supply test is applied by this output. This low-supply test is non-coincident with the smoke tests,
chamber sensitivity test, push button test, or any alarm signals.
The LED also provides a visual indication of the detector status as follows, assuming the component values shown in
Figure 8
:
Standby (includes low-supply and chamber sensitivity tests) - constantly illuminated
Local Smoke - constantly extinguished
Remote Smoke - constantly illuminated
Push button Test - constantly extinguished (system OK); constantly illuminated (system problem)
12
OSC
This pin is used in conjunction with external resistor R2 (10 M
) to V
DD
and external capacitor C3 (1500 pF) to V
DD
to
form an oscillator with a nominal period of 10.5 ms.
13
R1
This pin is used in conjunction with resistor R1 (100 k
) to pin 12 and C3 (1500 pF, see pin 12 description) to determine
the IRED pulse width. With this RC combination, the nominal pulse width is 105
μ
s.
14
VSS
This pin is the negative supply potential and the return for the I/O pin. Pin 14 is usually tied to ground.
15
LOW-
SUPPLY
TRIP
This pin is connected to an external voltage which determines the low-supply alarm threshold. The trip voltage is
obtained through a resistor divider connected between the VDD and LED pins. The low-supply alarm threshold voltage
(in volts)
≈
(5R7/R6) + 5 where R6 and R7 are in the same units.
16
TEST
This input has an on-chip pull-down device and is used to manually invoke a test mode.
The
Push button Test
mode is initiated by a high level at pin 16 (usually depression of a S.P.S.T. normally-open push
button switch to V
DD
). After one oscillator cycle, IRED pulses approximately every 336 ms, regardless of the presence
of smoke. Additionally, the amplifier gain is increased by automatic selection of C1. Therefore, the background
reflections in the smoke chamber may be interpreted as smoke, generating a simulated-smoke condition. After the
second IRED pulse, a successful test activates the horn-driver and I/O circuits. The active I/O allows remote signaling
for system testing. When the Push button Test switch is released, the Test input returns to V
SS
due to the on-chip pull-
down device. After one oscillator cycle, the amplifier gain returns to normal, thereby removing the simulated-smoke
condition. After two additional IRED pulses, less than a second, the IC exits the alarm mode and returns to standby
timing.
Table 4. Pin Description
(C o n tin u e d )
Pin No.
Pin Name
Description
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相關(guān)代理商/技術(shù)參數(shù) |
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| MCZ145012EG | 功能描述:煙霧報警器 PHOTO SMKE DET/NFPA TONE RoHS:否 制造商:ELMOS Semiconductor 描述/功能:Smoke detector controller 感應(yīng)方式:Photoelectric 工作電源電壓:24 V 輸出信號類型: |
| MCZ145012EG/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Photoelectric Smoke Detector IC with I/O and Temporal Pattern Horn Driver |
| MCZ145012EGR2 | 功能描述:煙霧報警器 PHOTO SMKE DET/NFPA RoHS:否 制造商:ELMOS Semiconductor 描述/功能:Smoke detector controller 感應(yīng)方式:Photoelectric 工作電源電壓:24 V 輸出信號類型: |
| MCZ145017EG | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Low-Power CMOS Ionization Smoke Detector IC with Temporal Pattern Horn Driver |
| MCZ145017EGR2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Low-Power CMOS Ionization Smoke Detector IC with Temporal Pattern Horn Driver |
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