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PDF ( 数据手册 , 数据表 ) 5358

零件编号 5358
描述 PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER
制造商 Allegro MicroSystems
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5358 数据手册, 描述, 功能
5358
PHOTOELECTRIC SMOKE DETECTOR
WITH INTERCONNECT AND TIMER
C1 1
C2 2
DETECT 3
STROBE 4
+ SUPPLY 5 VDD
IRED 6
I/O 7
HORN1 8
16 TEST
15 HUSH
VSS 14 – SUPPLY
OSC. &
TIMING
13 TIMING RES.
12 OSC. CAP.
LOGIC
11 LED
HORN
DRIVER
10 FEEDBACK
9 HORN2
Dwg. PC-007
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
Supply Voltage Range,
VDD .................................... -0.5 V to +15 V
Input Voltage Range,
VIN ............................ -0.3 V to VDD + 0.3 V
Input Current, IIN ................................... 10 mA
Operating Temperature Range,
TA ..................................... -25°C to +75°C
Storage Temperature Range,
TS ................................... -55°C to +125°C
CAUTION: CMOS devices have input static
protection but are susceptible to damage if exposed
to extremely high static electrical charges.
The A5358CA is a low-current BiCMOS circuit providing all of the
required features for a photoelectric type smoke detector. This device
can be used in conjunction with an infrared photoelectric chamber to
sense scattered light from smoke particles. Special features are
incorporated in the design to facilitate calibration and testing of the
finished detector. The device is designed to comply with Underwriters
Laboratories Specification UL217 and British Standard BS 5446,
Part 1.
A variable-gain photo amplifier can be directly interfaced to an
infrared emitter/detector pair. The amplifier gain levels are determined
by two external capacitors that are then 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
~10% to reduce false triggering. High gain is used during the push-
button test and during standby to periodically monitor the chamber
sensitivity.
The internal oscillator and timing circuitry keeps standby power to
a minimum by sensing for smoke every 10 seconds in a 10 µs window.
A special three-stage speedup sensing scheme is incorporated to
minimize the time to an audible alarm and also to reduce false trigger-
ing. Also, two consecutive cycles of degraded chamber sensitivity are
required for a warning signal to occur.
The A5358CA is supplied in a low-cost 16-pin dual in-line plastic
package. It is rated for continuous operation over the temperature
range of -25°C to +75°C.
FEATURES
s Interconnect Up to 50 Detectors
s Piezoelectric Horn Driver
s All Internal Low-Battery Detection
s Power-ON Reset
s Internal Timer & Control for Reduced Sensitivity
s Built-In Circuits to Reduce False Triggering
s 6 V to 12 V Operating Voltage Range
s ESD-Protection Circuitry on All Pins
Always order by complete part number: A5358CA .







5358 pdf, 数据表
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
PIN AND CIRCUIT DESCRIPTION, continued
The Diagnostic Test Mode is initiated by pulling this
pin below VSS and continuously sourcing 400 µA from the
pin for at least one clock cycle on the OSC. CAP. pin.
This mode is used to facilitate calibration and test of the IC
and the assembled detector. In this mode, certain device
pins are reconfigured as described below. In this mode,
the IRED pulse rate is increased to one every OSC. CAP.
cycle and the STROBE pin is always active. To exit this
mode, the test pin is floated for at least one OSC. CAP.
cycle.
Pin Name
HORN1
LED
Pin No. Configuration
8 This pin is reconfigured as the
smoke integrator output. Three
consecutive smoke detections
will cause this pin to go high
and three consecutive no-
smoke detections cause this
pin to go low.
11 This pin becomes a low-battery
indicator. The open-drain
NMOS output is normally OFF.
If VDD falls below the low-
battery threshold, the output
turns ON.
TYPICAL APPLICATION
VDD
CONNECT FOR TIMER MODE OR "HUSH" OPERATION
C1
C2 560
1
2
PUSH
TO
TEST
16
15
CONNECT FOR
NON-TIMER MODE
OPERATION
+ 9V
SMOKE
CHAMBER
200k
1k
+
100µF
3
4
5 VDD
6
7
8
VSS 14
OSC. &
TIMING
13
100k
12
LOGIC
HORN
DRIVER
11
1000pF
10
9
220k
TO/FROM
OTHER
UNITS
220
Dwg. EC-006
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000














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