A5358 PDF даташит
Спецификация A5358 изготовлена «Allegro» и имеет функцию, называемую «Photoelectric Smoke Detector». |
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Детали детали
Номер произв | A5358 |
Описание | Photoelectric Smoke Detector |
Производители | Allegro |
логотип |
13 Pages
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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
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A5358
Photoelectric Smoke Detector
with Interconnect and Timer
Selection Guide
Part Number
A5358CA
A5358CA-T
A5358CLWTR-T
Pb-free
–
Yes
Yes
Package
16-pin DIP through hole
16-pin DIP through hole
16-pin SOICW surface mount
Packing
25 pieces / tube
25 pieces / tube
1000 pieces / reel
Absolute Maximum Ratings*
Characteristic
Symbol
Notes
Rating
Units
Supply Voltage Range
VDD Referenced to VSS
–0.5 to 15
V
Input Voltage Range
VIN Referenced to VSS
–0.3 to VDD+0.3
V
Input Current
IIN
10 mA
Operating Ambient Temperature Range
TA
–25 to 75
ºC
Maximum Junction Temperature
TJ(max)
150 ºC
Storage Temperature Range
Tstg
–55 to 125
ºC
*CAUTION: BiCMOS devices have input static protection but are susceptible to damage if exposed to extremely high static electrical
charges.
Thermal Characteristics
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
Package A, on 4-layer PCB based on JEDEC standard
Package LW, on 4-layer PCB based on JEDEC standard
Value Units
38 ºC/W
48 ºC/W
*Additional thermal information available on Allegro website.
Pin-out Diagrams
Package A
C1 1
C2 2
DETECT 3
STROBE 4
VDD 5
IRED 6
I/O 7
HORN1 8
16 TEST
15 HUSH
14 VSS
13 TIMING RES
12 OSC CAP
11 LED
10 FEEDBACK
9 HORN2
Package LW
C1 1
C2 2
DETECT 3
STROBE 4
VDD 5
IRED 6
I/O 7
HORN1 8
16 TEST
15 HUSH
14 VSS
13 TIMING RES
12 OSC CAP
11 LED
10 FEEDBACK
9 HORN2
Terminal List Table
Number
1
Name
C1
2 C2
3 DETECT
4 STROBE
5 VDD
6 IRED
7 I/O
8 HORN1
9 HORN2
10 FEEDBACK
11 LED
12 OSC CAP
13 TIMING RES
14 VSS
15 HUSH
16 TEST
Function
Sets photoamplifier gain in supervisory mode
Sets photoamplifier gain in standby mode
Photoamplifier input
Strobed supply (VDD – 5 V) for photoamplifier low-side
reference
Positive supply voltage
Output to smoke chamber IR LED driver
Input-output to interconnected detectors
Output for driving piezoelectric horn
Complementary output for driving piezoelectric horn
Input for driving piezoelectric horn
Output to drive visible LED
Connection for capacitor to set clock frequency
Connection for resistor to set clock frequency
Negative supply voltage
Input for photoamplifier timer mode reference; can also
disable timer mode
Enables push-to-test mode and diagnostic test/calibration
mode; starts timer mode, if enabled
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
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A5358
Photoelectric Smoke Detector
with Interconnect and Timer
Functional Block Diagram
+Supply VDD
9V
DETECT
C1
C2
STROBE
IRED
Band-gap
Reference
+
_
Low Battery
I/O
VDD
Photoamp
+
_
Logic
Power-On
Reset
VDD
Oscillator
and Timing
HUSH
TEST
FEEDBACK
HORN2
HORN1
LED
VDD
TIMING RES
OSC CAP
VSS
VDD
–Supply
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
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