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Teilenummer | A5358 |
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Beschreibung | Photoelectric Smoke Detector | |
Hersteller | Allegro | |
Logo | ||
Gesamt 13 Seiten 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
Photoelectric Smoke Detector
with Interconnect and Timer
AC ELECTRICAL CHARACTERISTICS (continued) at TA = –25°C to 75°C1, VSS = 0 V, in typical application (unless otherwise noted)
Characteristic
Symbol
Test Conditions
Test Pin VDD Min. Typ.2 Max. Units
tired1 No local or remote smoke
6 9 9.6 – 11.9 s
tired2 After 1 of 3 valid samples
6 9 2.42 2.70 2.96 s
IRED Pulse Period
tired3
After 2 of 3 valid samples and during local
alarm
6 9 1.21 1.34 1.47 s
tired4 Remote smoke only
6 9 9.67 10.8 11.8 s
tired5 Chamber test, no local alarm
6 9 38.9 – 47.1 s
tired6 Pushbutton test, induced alarm
6 9 300 336 370 ms
IRED Pulse Width
tw(ired)
6 9 94 – 116 μs
IRED Rise Time
tr(ired)
10% to 90%
6 – – 30 μs
IRED Fall Time
tf(ired)
90% to 10%
6 – – 200 μs
I/O to Active Delay
td(io) Local alarm
7 9– 0 –s
Rising Edge on I/O to Alarm
tr(io) No local alarm
7
9
–
–
13 ×
tOSC
s
Horn Warning Pulse Period
thorn Low battery or degraded chamber sensitivity 8, 9 9 38.9 – 47.1 s
Horn Warning Pulse Width
tw(horn)
Low battery or degraded chamber sensitivity
8, 9
9 9.5 – 11.5 ms
Horn On-Time
ton(horn)
Local or remote alarm
8, 9 9 – 252 – ms
Horn Off-Time
toff(horn)
Local or remote alarm
8, 9 9 – 84 – ms
1Limits over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only.
2Typical values are at 25°C and are given for circuit design information only.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
6 Page A5358
Photoelectric Smoke Detector
with Interconnect and Timer
19.05
+0.64
–0.38
16
A
12
Package A, 16-Pin DIP
0.25
+0.10
–0.05
6.35
+0.76
–0.25
7.62 BSC 10.92 MAX
0.13 MIN
16X 0.46±0.10
0.25 M C
Branded Face
3.30
+1.65
–0.38
0.38 MIN
2.54 BSC
1.52
+0.25
–0.38
SEATING C
PLANE
5.33 MAX
3.30
+0.51
–0.38
A Terminal #1 mark area
For Reference Only; not for tooling use (reference MS-001BB)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
10.30 ±0.20
16
A
12
16X
0.10 C
0.51
0.31
1.27 BSC
Package LW, 16-Pin SOICW
8°
0°
0.33
0.20
16
2.25
0.65
7.50 ±0.10 10.30 ±0.33
1.27
9.50
C
SEATING
PLANE
2.65 MAX
0.30
0.10
1.40 REF
1.27
0.40
0.25 BSC
SEATING PLANE
GAUGE PLANE
12
C PCB Layout Reference View
For Reference Only; not for tooling use (reference MS-013AA)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A Terminal #1 mark area
B Branding scale and appearance at supplier discretion
C Reference land pattern layout (reference IPC7351
SOIC127P1030X265-16M); all pads a minimum of 0.20 mm from all
adjacent pads; adjust as necessary to meet application process
requirements and PCB layout tolerances
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
12
12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ A5358 Schematic.PDF ] |
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