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A5347CA 데이터시트 PDF




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부품번호 A5347CA 기능
기능 SMOKE DETECTOR WITH INTERCONNECT AND TIMER
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A5347CA 데이터시트, 핀배열, 회로
5347
SMOKE DETECTOR
WITH INTERCONNECT AND TIMER
TIMER START 1
I/O 2
LOW-V SET 3
TIMER OUT 4
LED 5
+ SUPPLY 6 V DD
TIMING RES. 7
FEEDBACK 8
LOGIC
OSC. &
TIMING
HORN
DRIVER
16 GUARD 2
15 DETECT. IN
14 GUARD1
13
SENSITIVITY
SET
12 OSC. CAP.
11 HORN 2
10 HORN1
VSS 9 – SUPPLY
Dwg. PC-004
The A5347CA is a low-current, CMOS circuit providing all of the
required features for an ionization-type smoke detector. A networking
capability allows as many as 125 units to be interconnected so that if
any unit senses smoke, all units will sound an alarm. In addition,
special features are incorporated to facilitate alignment and test of the
finished smoke detector. This device is designed to comply with
Underwriters Laboratories Specification UL217.
The internal oscillator and timing circuitry keeps standby power to
a minimum by powering down the device for 1.66 seconds and sensing
smoke for only 10 ms. Every 24 on/off cycles, a check is made for low
battery condition. By substituting other types of sensors, or a switch
for the ionization detector, this very-low power device can be used in
numerous other battery-operated safety/security applications.
The A5347CA is supplied in a low-cost, 16-pin dual in-line plastic
package. It is rated for continuous operation over the temperature
range of 0°C to +50°C.
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 ..................................... 0°C to +50°C
Storage Temperature Range,
TS ............................... -55°C to +125°C
CAUTION: CMOS devices have input static
protection but are susceptible to damage when
exposed to extremely high static electrical
charges.
FEATURES
s Interconnect Up to 125 Detectors
s Piezoelectric Horn Driver
s Guard Outputs for Detector Input
s Pulse Testing for Low Battery
s Power-ON Reset
s Internal Timer & Control for Reduced Sensitivity
s Built-In Hysteresis Reduces False Triggering
Always order by complete part number: A5347CA .




A5347CA pdf, 반도체, 판매, 대치품
5347
SMOKE DETECTOR
with INTERCONNECT
and TIMER
ELECTRICAL CHARACTERISTICS continued
Characteristic
Timer Out Output Current
LED Output ON Current
LED Output ON Time
LED Output OFF Time
I/O Current
I/O Alarm Voltage
I/O Delay
Supply Current
Test
Pin
4
5
5
5
2
2
2
6
Test Conditions
V = 0.5 V
OUT
VDD = 7.2 V, VOUT = 1.0 V
No Alarm, In Standby
No Alarm, Timer Mode After Pin 1
High-to-Low
No Alarm, VI/O = VDD - 2.0 V
Alarm, VI/O = VDD - 2.0 V
External “Alarm” In
“Alarm” Out
V = 9.0 V, No Alarm, No Loads
DD
V = 12 V, No Alarm, No Loads
DD
Min.
500
10
8.0
32
8.0
25
-7.5
3.0
Limits
Typ. Max.
——
——
10 12
40 48
Units
µA
mA
ms
s
10 12 s
— 60 µA
— — mA
— —V
3.0 —
s
5.0 9.0 µA
— 12 µA
NOTE 1: Negative current is defined as coming out of (sourcing) the specified device pin.
NOTE 2: Alarm (Smoke) Condition is defined as V15 < V13; No Alarm (No Smoke) Condition as V15 > V13.
CIRCUIT DESCRIPTION
The A5347CA is a low-current CMOS circuit providing all of the
required features for an ionization-type smoke detector.
Oscillator. An internal oscillator operates with a period of 1.67
seconds during no-smoke conditions. Every 1.67 seconds, internal
power is applied to the entire circuit and a check is made for smoke.
Every 24 clock cycles (40 seconds), the LED is pulsed and a check
is made for low battery by comparing VDD to an internal reference.
Since very-low currents are used in the device, the oscillator capacitor
at pin 12 should be a low-leakage type (PTFE, polystyrene, or
polypropylene).
Detector Circuitry. When smoke is detected, the resistor divider
network that sets the sensitivity (smoke trip point) is altered to increase
the sensitivity set voltage (pin 13) by typically 130 mV with no external
connections to pins 3 or 13. This provides hysteresis and reduces
false triggering. An active guard is provided on both pins adjacent to
the detector input (pin 15). The voltage at pins 14 and 16 will be within
100 mV of the input. This will keep surface leakage currents to a
minimum and provide a method of measuring the input voltage without
loading the ionization chamber. The active guard amplifier is not
power strobed and thus provides constant protection from surface
leakage currents. The detector input has internal diode protection
against static damage.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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A5347CA 전자부품, 판매, 대치품
5347
SMOKE DETECTOR
with INTERCONNECT
and TIMER
INTERNAL
CLOCK
HORN
I/O OPERATION
40 ms
REMOTE ALARM MODE
4 CYCLES
HORN
ON
2 CYCLES
OFF
1.67 s
V2 IN
I/O
HORN NOT SELF COMPLETING
WHEN IN REMOTE ONLY ALARM
INTERNAL
CLOCK
HORN
V2 OUT
I/O
LOCAL ALARM MODE
HORN
ON
OFF
72 CLOCK CYCLES
Dwg. WC-004

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A5347CA

SMOKE DETECTOR WITH INTERCONNECT AND TIMER

Allegro MicroSystems
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