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A5358 데이터시트 PDF




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부품번호 A5358 기능
기능 Photoelectric Smoke Detector
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A5358 데이터시트, 핀배열, 회로
A5358
Photoelectric Smoke Detector
with Interconnect and Timer
Features and Benefits
Low average standby current for long battery life
Interconnect up to 50 detectors
Piezoelectric horn driver
Low battery detection (all internal)
Chamber sensitivity test and alarm
Power-on reset (POR)
Internal timer and control for reduced sensitivity mode
Built-in circuits to reduce false triggering
6 to 12 V operating range
ESD protection circuitry on all pins
Packages:
16-pin DIP
(Package A)
16-pin SOICW
(Package LW)
Not to scale
Description
The A5358 is a low-current BiCMOS circuit providing all of
the required features for a photoelectric type smoke detector.
This device can be used with an infrared photoelectric chamber
to sense scattered light from smoke particles. A networking
capability allows as many as 50 units to be interconnected so
that if any unit senses smoke all units will sound an alarm.
Special features are incorporated in the design to facilitate
calibration and testing of the finished detector. The device is
designed for applications that comply with European Standard
EN 14604 and British Standard BS 5446, Part 1.
A variable-gain photoamplifier can be directly interfaced to
an infrared emitter-detector pair. The amplifier gain levels are
determined by two external capacitors and are internally selected
depending on the operating mode. Low gain is selected during
standby and timer modes. During a local alarm, this low gain
is increased (internally) by approximately 10% to reduce false
triggering. High gain is used during pushbutton test and to
periodically monitor the chamber sensitivity during standby.
The internal oscillator and timing circuitry keep standby power
to a minimum by sensing for smoke for only 100 μs every 10 s.
A special three-stage–speedup sensing scheme is incorporated
to minimize the time to an audible alarm and also to reduce
false triggering. Chamber sensitivity is periodically monitored
and two consecutive cycles of degraded sensitivity are required
for a warning signal (chirp) to occur.
The A5358 is supplied in a 16-pin dual in-line plastic package
(suffix A), and for surface mount, a 16-pin SOICW (suffix
LW). The lead (Pb) free versions (suffix –T) have 100% matte-
tin leadframe plating. The devices are rated for continuous
operation over the temperature range of –25°C to 75°C.
Typical Application Diagram
Rx1
A Rx2
26110.10-DS, Rev. I
VDD
8.2 kΩ
5 kΩ
4.7 kΩ
0.047 μF
560 Ω
4700 pF
200 kΩ
1 kΩ
Smoke
Chamber
100 μF
22 Ω
To / from
other units
220 Ω
1 C1
2 C2
3
4
DETECT
STROBE
5 VDD
6 IRED
7 I/O
8 HORN1
9V
A5358
TEST 16
22 μF
Push-to-Test
HUSH 15
VSS 14
B
Red LED
1500 pF
TIMING RES 13
100 kΩ
10 MΩ
OSC CAP 12
330 Ω
LED 11
FEEDBACK 10
HORN2 9
220 kΩ C
1000 pF
C Piezo Horn
1.5 MΩ C
A Connect to allow timer mode
("hush") operation
B Connect HUSH to VSS
to disable timer mode
C Value of component can vary,
based on the piezoelectric horn used




A5358 pdf, 반도체, 판매, 대치품
A5358
Photoelectric Smoke Detector
with Interconnect and Timer
DC ELECTRICAL CHARACTERISTICS at TA = –25°C to 75°C1. VSS = 0 V, in typical application (unless otherwise noted)
Characteristic
Supply Voltage Range
Symbol
VDD
Test Conditions
Average in standby mode, configured per
typical application
Test Pin
5
5
VDD
12
Min.
6.0
Typ.2
Operating Supply Current
IDD
During STROBE on, IRED off, configured per
typical application
5
12 –
During STROBE on, IRED on, configured per
typical application
5
12 –
7 9––
Low-Level Input Voltage
VIL
10 9 – –
16 9 – –
15 9 – –
7 9 3.2 –
High-Level Input Voltage
VIH
10 9 6.3 –
16 9 8.5 –
15 9 1.6 –
Input Leakage High
Input Leakage Low
IIH
VIN = VDD, STROBE active, OSC CAP = VDD
VIN = VDD
1, 2
3, 10, 12
12
12
VIN = VST, STROBE active, OSC CAP = VDD
1, 2, 3
12
IIL VIN = VSS
10, 12
15, 16
12
12
Input Pull-Down Current
Low-Level Output Voltage
High-Level Output Voltage
Strobe Output Voltage
VIN = VDD
IIN No local smoke, VIN = VDD
No local smoke, VIN = 17 V
IO = 10 mA
VOL IO = 16 mA
IO = 5 mA
VOH IO = –16 mA
Inactive, IO = –1 μA
VST
Active, IO = 100 to 500 μA
16, 15
7
7
11
8, 9
13
8, 9
4
4
9 0.25 –
9 20 –
12 –
6.5 –
6.5 –
6.5 – 0.5
6.5 5.5
12
VDD
– 0.1
9
VDD
– 5.25
Line Regulation
Strobe Temperature
Coefficient
ΔVST(ΔVDD)
αST
Active, VDD = 6 to 12 V
VDD = 6 to 12 V
4 – – –60
4 – – 0.01
IRED Output Voltage
VIRED
Inactive, IO = 1 μA, TA = 25°C
Active, IO = –6 mA, TA = 25°C
6
12 –
6 9 2.85 3.1
Max.
12
9
2.0
3.0
1.5
2.7
7.0
0.5
100
100
–100
–100
–1.0
10
80
140
0.6
1.0
VDD
– 4.75
0.1
3.35
Units
V
μA
mA
mA
V
V
V
V
V
V
V
V
nA
nA
nA
nA
μA
μA
μA
μA
V
V
V
V
V
V
dB
%/°C
V
V
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4

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A5358 전자부품, 판매, 대치품
A5358
Photoelectric Smoke Detector
with Interconnect and Timer
Pin and Circuit Description
(In Typical Application)
C1 Pin
A capacitor connected to this pin determines the gain, Ae, of
the photoamplifier during the push-to-test mode and during the
chamber monitor test. A typical capacitor value for this high-
gain (supervisory) mode is 0.047 μF, but it should be selected
based on the photochamber 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 and thus C1
should not exceed 0.1 μF. Coupling of other signals to the C1,
C2, and DETECT inputs must be minimized.
C2 Pin
A capacitor connected to this pin determines the gain, Ae, of
the photoamplifier during standby. A typical capacitor value for
this low-gain mode is 4700 pF, but it should be selected based
on a specific photochamber and the desired level of sensitiv-
ity to smoke. Ae = 1 + (C2/ 10), where C2 is in pF. Ae should not
exceed 10,000 and thus C2 should not exceed 0.1 μF. This gain
increases by a nominal 10% after a local alarm is detected (three
consecutive detections). A resistor must be installed in series
with the C2 capacitor.
DETECT Pin
This is the input to the photoamplifier and is connected to the
cathode of the photodiode. The photodiode is operated at zero
bias and should have low dark leakage current and low capaci-
tance. A shunt resistor must be installed in parallel with the
photodiode.
STROBE Pin
This output provides a strobed, regulated voltage of VDD – 5 V.
The minus side of all internal and external photoamplifier cir-
cuitry is referenced to this pin.
VDD Pin
This pin is connected to the positive supply potential and can
range from 6 to 12 V with respect to VSS.
IRED Pin
This output provides a pulsed base current for the external NPN
transistor, which drives the IR emitter. Its beta should be greater
than 100. To minimize noise impact, the IRED output is not
active when the horn and visible LED outputs are active.
I/O Pin
A connection at this pin allows multiple smoke detectors to be
interconnected. If any single unit detects smoke, its I/O pin is
driven high, and all connected units will sound their associated
horns.
As an input, the I/O is sampled every fourth clock cycle (nomi-
nally 42 ms). When the I/O pin is driven high by another device,
three consecutive samples with I/O high plus one additional
cycle (nominally 10.5 ms) are required to cause an alarm. If the
I/O falls below its threshold at any time during those (nomi-
nally) 95 ms, an internal latch is reset and there will not be an
alarm. Thus, depending on when during the (nominally) 42 ms
sample cycle I/O is initially forced high, the I/O must remain
high for a minimum of (nominally) 95 to 137 ms to cause an
alarm. This filtering provides significant immunity to I/O noise.
The LED is suppressed when an alarm is signaled from an
interconnected unit, and any local alarm condition causes this
pin to be ignored as an input. This pin has an on-chip pull-down
device and must be left unconnected if not used. In the applica-
tion, there should be a series current-limiting resistor to other
smoke alarms.
HORN1, HORN2, and FEEDBACK Pins
These three pins are used with a self-resonating piezoelectric
transducer and horn-starting external passive components. The
output HORN1 is connected to the piezo metal support elec-
trode. The complementary output, HORN2, is connected to the
ceramic electrode. The FEEDBACK input is connected to the
feedback electrode. If the FEEDBACK pin is not used, it must
be connected to VSS.
LED Pin
This open-drain NMOS output is used to directly drive a visible
LED. The load for the low-battery test is applied to this output.
If an LED is not used, it should be replaced with an equivalent
resistor (typically 500 to 1000 Ω) such that the battery load-
ing remains about 10 mA. The low-battery test does not occur
coincident with any other test or alarm signal. The LED also
indicates detector status as follows (with component values as in
the typical application, all times nominal):
Condition
Standby
Local Smoke
Remote Alarm
Test Mode
Timer Mode
Pulse Occurrence
Every 43 s
Every 0.67 s
No pulses
Every 0.67 s
Every 10 s
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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