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5354 데이터시트 PDF




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부품번호 5354 기능
기능 SMOKE DETECTOR WITH INTERCONNECT
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5354 데이터시트, 핀배열, 회로
5354
NO CONNECT. 1 NC
I/O 2
LOW-V SET 3
NO CONNECT. 4 NC
LED 5
LOGIC
OSC. &
TIMING
16 GUARD 2
15 DETECT. IN
14 GUARD1
13
SENSITIVITY
SET
12 OSC. CAP.
+ SUPPLY 6 V DD
TIMING RES. 7
HORN
DRIVER
FEEDBACK 8
11 HORN 2
10 HORN 1
V SS 9 – SUPPLY
Dwg PC-004-1
SMOKE DETECTOR
WITH INTERCONNECT
The A5354CA 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 A5354CA 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. Similar devices, with an internal timer to allow
for a period of reduced sensitivity (“hush”), are available as the
A5348CA.
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
Supply Voltage Range,
VDD ................................ -0.5 V to +15 V
Reverse Battery (10.5 V) ....................... 20 s
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 Reverse Battery Protection
s Built-In Hysteresis Reduces False Triggering
Always order by complete part number: A5354CA .




5354 pdf, 반도체, 판매, 대치품
5354
SMOKE DETECTOR
with INTERCONNECT
ELECTRICAL CHARACTERISTICS continued
Characteristic
I/O Current
I/O Alarm Voltage
I/O Delay
Supply Current
Test
Pin
2
2
2
6
Test Conditions
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.
25
-7.5
3.0
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.
Limits
Typ. Max.
— 60
——
——
3.0 —
5.0 9.0
— 12
Units
µA
mA
V
s
µA
µA
CIRCUIT DESCRIPTION
The A5354CA 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.
Because very-low currents are used in the
device, the oscillator capacitor at pin 12
should be a low-leakage type (PTFE, polysty-
rene, or polypropylene).
Detector Circuitry. When smoke is de-
tected, 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 connec-
tions to pins 3 or 13. This provides hyster-
esis 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.
Alarm Circuitry. If smoke is detected, the oscillator period changes to
40 ms and the horn is enabled. The horn output is typically 160 ms
ON, 80 ms OFF. During the OFF time, smoke is again checked and
will inhibit further alarm output if smoke is not sensed. During smoke
conditions the low battery alarm is inhibited and the LED is driven at a
1 Hz rate.
Sensitivity Adjust. The detector sensitivity to smoke is set internally
by a voltage divider connected between VDD and VSS. The sensitivity
can be externally adjusted to the individual characteristics of the
ionization chamber by connecting a resistor between pin 13 and VDD, or
between pin 13 and VSS.
Low Battery. The low battery threshold is set internally by a voltage
divider connected between VDD and VSS. The threshold can be in-
creased by connecting a resistor between pin 3 and VDD. The thresh-
old can be decreased by connecting a resistor between pin 3 and VSS.
The battery voltage level is checked every 40 seconds during the 10
mA, 10 ms LED pulse. If an LED is not used, it should be replaced
with an equivalent resistor (typically 500 to 1000 ) such that the
battery loading remains at 10 mA.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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5354 전자부품, 판매, 대치품
5354
SMOKE DETECTOR
with INTERCONNECT
16
0.280
0.240
Dimensions in Inches
(controlling dimensions)
9
0.014
0.008
0.430
MAX
0.300
BSC
1
0.070
0.045
0.210
MAX
0.015
MIN
0.022
0.014
16
7.11
6.10
0.775
0.735
0.100
BSC
8
0.005
MIN
0.150
0.115
Dimensions in Millimeters
(for reference only)
9
Dwg. MA-001-16A in
0.355
0.204
10.92
MAX
7.62
BSC
1
1.77
1.15
5.33
MAX
19.68
18.67
2.54
BSC
8
0.13
MIN
0.39
MIN
0.558
0.356
NOTES: 1. Lead thickness is measured at seating plane or below.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendor’s option within limits shown.
3.81
2.93
Dwg. MA-001-16A mm

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부품번호상세설명 및 기능제조사
5350

SMOKE DETECTOR WITH INTERCONNECT

Allegro MicroSystems
Allegro MicroSystems
5354

SMOKE DETECTOR WITH INTERCONNECT

Allegro MicroSystems
Allegro MicroSystems

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