5358 [ALLEGRO]
PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER; 与互连和定时器光电感烟探测器
| 型号： | 5358 |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | PHOTOELECTRIC SMOKE DETECTOR WITH INTERCONNECT AND TIMER |
| 文件： | 总12页 (文件大小：100K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
5358
PHOTOELECTRIC SMOKE DETECTOR
WITH INTERCONNECT AND TIMER
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.
16
15 HUSH
1
2
3
4
5
6
TEST
C
C
1
2
V
14
13
– SUPPLY
TIMING RES.
DETECT
STROBE
SS
OSC. &
TIMING
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.
+ SUPPLY
IRED
V
12
11
OSC. CAP.
LED
DD
LOGIC
I / O
7
8
10
9
FEEDBACK
HORN
DRIVER
HORN
2
HORN
1
Dwg. PC-007
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.
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
FEATURES
■ Interconnect Up to 50 Detectors
■ Piezoelectric Horn Driver
Supply Voltage Range,
VDD .................................... -0.5 V to +15 V
Input Voltage Range,
■ All Internal Low-Battery Detection
■ Power-ON Reset
VIN ............................ -0.3 V to VDD + 0.3 V
Input Current, IIN ................................... 10 mA
Operating Temperature Range,
■ Internal Timer & Control for Reduced Sensitivity
■ Built-In Circuits to Reduce False Triggering
■ 6 V to 12 V Operating Voltage Range
■ ESD-Protection Circuitry on All Pins
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.
Always order by complete part number: A5358CA .
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
FUNCTIONAL BLOCK DIAGRAM
+ SUPPLY V
5
I / O
7
DD
FEEDBACK
10
V
9 V
DD
BAND-GAP
REFERENCE
9
HORN
2
+
–
8
HORN
1
LOW BATTERY
LOGIC
+V
11
LED
PHOTO AMP
+
–
3
1
POWER-ON
RESET
DETECT
C1
C2
TIMING RES.
13
+V
2
4
6
OSCILLATOR
& TIMING
STROBE
IRED
12
V
DD
OSC. CAP.
– SUPPLY
14
15
HUSH
16
V
TEST
SS
Dwg. FC-006
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1995, 1996 Allegro MicroSystems, Inc.
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
DC ELECTRICAL CHARACTERISTICS at TA = -25°C to +75°C*, VSS = 0 V, in typical application
(unless otherwise noted).
Test
Pin
Limits
Typ.
Characteristic
Symbol
VDD
Test Conditions
VDD
–
Min.
6.0
–
Max.
12
Units
V
Supply Voltage Range
Operating Supply Current
5
5
–
–
IDD
Average Standby
12
12
µA
Configured per Figure 1
During Strobe ON, IRED OFF,
Configured per Figure 1
5
5
12
12
–
–
–
–
2.0
3.0
mA
mA
During Strobe ON, IRED ON,
Configured per Figure 1
Low-Level Input Voltage
High-Level Input Voltage
VIL
7
9
9
9
9
–
–
–
–
–
–
–
–
1.5
2.7
7.0
0.5
V
V
V
V
10
16
15
VIH
7
9
9
9
9
3.2
6.3
8.5
1.6
–
–
–
–
–
–
–
–
V
V
V
V
10
16
15
Input Leakage High
Input Leakage Low
IIH
VIN = VDD, Strobe Active,
Pin 12 @ VDD
1, 2
12
–
–
100
nA
VIN = VDD
3, 10, 12
1, 2, 3
12
12
–
–
–
–
100
nA
nA
IIL
VIN = VST, Strobe Active,
Pin 12 @ VDD
-100
VIN = VSS
10, 12
15, 16
16, 15
7
12
12
9
–
–
–
-100
nA
µA
µA
µA
µA
V
–
-1.0
Input Pull-Down Current
Low-Level Output Voltage
IIN
VIN = VDD
0.25
–
10
No Local Smoke, VIN = VDD
No Local Smoke, VIN = 17 V
IO = 10 mA
9
20
–
80
7
12
6.5
6.5
6.5
6.5
12
9
–
–
140
VOL
11
–
–
0.6
IO = 16 mA
8, 9
13
–
–
–
1.0
V
IO = 5 mA
0.5
–
–
V
High-Level Output Voltage
Strobe Output Voltage
VOH
VST
IO= -16 mA
8, 9
4
5.5
–
–
V
Inactive IO = -1 µA
Active, IO = 100 µA to 500 µA
VDD - 0.1
VDD - 5.25
–
V
4
–
VDD - 4.75
V
Continued...
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
DC ELECTRICAL CHARACTERISTICS, continued
Test
Pin
Limits
Typ.
Characteristic
Symbol
Test Conditions
VDD
–
Min.
–
Max.
–
Units
dB
Line Regulation
∆VST(∆VDD) Active, VDD = 6 V to 12 V
4
4
6
6
6
6
7
-60
0.01
–
Strobe Temperature Coeff.
IRED Output Voltage
αST
VDD = 6 V to 12 V
–
–
–
%/°C
V
VIRED
Inactive IO = 1 µA, TA = +25°C
Active IO = -6 mA, TA = +25°C
12
9
–
0.1
3.35
–
2.85
–
3.1
-35
+0.40
–
V
Line Regulation
∆VIRED(∆VDD) Active, VDD = 6 V to 12 V
dB
IRED Temperature Coefficient
High-Level Output Current
αIRED
VDD = 6 V to 12 V
–
9
–
–
%/°C
mA
IOH
VDD = Alarm, I/O active,
VO = VDD - 2 V
-4.0
–
OFF Leakage Current High
OFF Leakage Current Low
Low VDD Alarm Threshold
Common Mode Voltage
IOZ
IOZ
VDD(th)
VIC
VO = VDD
VO = VSS
11, 13
11, 13
5
12
12
-
–
–
–
–
1.0
-1.0
µA
µA
V
6.9
7.2
–
7.5
Any Alarm Condition
Any Alarm Condition
1, 2, 3
Internal
-
VDD - 4
VDD - 3.7
VDD - 2
VDD - 3.3
V
Smoke Comparator Ref. Volt.
VREF
-
–
V
* Limits over the operating temperature range are based on characterization data.
Characteristics are production tested at +25°C only.
Typical values are at +25°C and are given for circuit design information only.
AC ELECTRICAL CHARACTERISTICS at TA = -25°C to +75°C*, VSS = 0 V, in typical application
(unless otherwise noted).
Test
Pin
Limits
Typ.
Characteristic
Oscillator Period
Led Pulse Period
Symbol
tosc
Test Conditions
VDD
9
Min.
9.4
Max.
11.5
48
Units
12
11
11
11
11
11
10.5
–
ms
s
tled1
No Local or Remote Smoke
Remote Smoke Only
9
39
tled4
9
None
0.60
9.67
9.5
–
–
–
tled6
Local Smoke or Test
9
0.67
10.8
–
0.74
11.8
11.5
s
tled7
Timer Mode, No Alarm
9
s
Led Pulse Width
tw(led)
9
ms
Continued...
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
AC ELECTRICAL CHARACTERISTICS, continued.
Test
Pin
Limits
Typ.
Characteristic
Symbol
tst1
Test Conditions
VDD
9
Min.
9.6
Max.
11.9
2.96
1.47
Units
Strobe Pulse Period
No Local or Remote Smoke
After 1 of 3 Valid Samples
4
4
4
–
s
s
s
tst2
9
2.42
1.21
2.70
1.34
tst3
After 2 of 3 Valid Samples
and During Local Alarm
9
tst4
tst5
Remote Alarm
4
4
9
9
9.67
38.9
10.8
–
11.8
47.1
s
s
Chamber Test or Low Supply
Test, No Local Alarm
tst6
Pushbutton Test, No Alarm
4
4
6
6
6
9
9
9
9
9
300
9.5
336
–
370
11.5
11.9
2.96
1.47
ms
ms
s
Strobe Pulse Width
IRED Pulse Period
tw(st)
tired1
tired2
tired3
No Local or Remote Smoke
After 1 of 3 Valid Samples
9.6
–
2.42
1.21
2.70
1.34
s
After 2 of 3 Valid Samples
and During Local Alarm
s
tired4
tired5
tired6
tw(ired)
tr(ired)
tf(ired)
td(io)
Remote Alarm
6
6
9
9
9
9
9.67
38.9
300
94
–
10.8
–
11.8
47.1
370
116
30
s
s
Chamber Test, No Local Alarm
Pushbutton Test, No Alarm
6
336
–
ms
µs
µs
µs
s
IRED Pulse Width
6
IRED Rise Time
10% to 90%
90% to 10%
Local Alarm
No Local Alarm
6
–
IRED Fall Time
6
–
–
200
–
I/O to Active Delay
Rising Edge on I/O to Alarm
Horn Warning Pulse Period
7
9
9
9
–
0
tr(io)
7
–
–
1.34
47.1
s
thorn
Low Supply and Degraded
Chamber Sensitivity
8, 9
38.9
–
s
Horn Warning Pulse Width
tw(horn)
Low Supply and Degraded
Chamber Sensitivity
8, 9
9
9.5
–
11.5
ms
Horn ON Time
Horn OFF Time
ton(horn)
toff(horn)
Local or Remote Alarm
Local or Remote Alarm
8, 9
8, 9
9
9
–
–
252
84
–
–
ms
ms
* Limits over the operating temperature range are based on characterization data.
Characteristics are production tested at +25°C only.
Typical values are at +25°C and are given for circuit design information only.
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
PIN AND CIRCUIT DESCRIPTION
(In Typical Application)
PIN 1 (C1)
PIN 5 (VDD
)
A capacitor connected to this pin determines the gain
This pin is connected to the most-positive supply
potential and can range from 6 V to 12 V with respect
to VSS.
of the photo amplifier during the push-to-test mode and
during the chamber monitor test. A typical value for this
high-gain mode is 0.047 µF but should be selected
based on the photo chamber background reflections
reaching the detector and the desired level of sensitivity.
Ae ≈ 1+(C1/10) where C1 is in pF. Ae should not
exceed 10 000.
PIN 6 (IRED
)
This output provides a pulsed base current for the
external npn transistor, which drives the IR emitter. Its
beta should be greater than 100. The IRED output is not
active, to minimize noise impact, when the horn and
visible LED outputs are active.
PIN 2 (C2)
A capacitor connected to this pin determines the gain
of the photo amplifier during standby. A typical value for
this low-gain mode is 4700 pF but should be selected
based on a specific photo chamber and the desired level
of sensitivity to smoke. Ae ≈ 1+(C2/10) where C2 is in pF.
Ae should not exceed 10 000. This gain increases by a
nominal 10% after a local alarm is detected (three con-
secutive detections). Coupling of other signals to C2
(C1 and the DETECT inputs also) must be minimized.
PIN 7 (I/O)
A connection at this pin allows multiple smoke detec-
tors to be interconnected. If a local smoke condition
occurs, this pin is driven high. As an input, this pin is
sampled nominally every 1.35 seconds during standby.
Any local-alarm condition causes this pin to be ignored as
an input.
This pin has an on-chip pull-down resistor and must
be left unconnected if not used. In application, there is a
series current-limiting resistor to other smoke alarms.
A resistor must be installed in series with C2.
PIN 3 (DETECT)
PIN 8 (HORN1)
This is the input to the photo amplifier and is con-
nected to the cathode of the photo diode. The photo
diode is operated at zero bias and should have low dark-
leakage current and low capacitance.
PIN 9 (HORN2)
PIN 10 (FEEDBACK)
These three pins are used in conjunction with external
passive components and a self-resonating piezoelectric
transducer. HORN1 is connected to the piezo metal
support electrode; the complementary output, HORN2, is
connected to the ceramic electrode and the FEEDBACK
input to the feedback electrode.
PIN 4 (STROBE)
This output provides a strobed, regulated voltage of
VDD – 5 V. The minus side of all internal and external
photo amplifier circuitry is referenced to this pin.
A continuous modulated tone indicates either a local
or remote alarm condition. A short (10 ms) chirp indicates
a low-battery condition or degraded chamber sensitivity.
The low-battery chirp occurs almost simultaneous with the
visible LED flash. If the FEEDBACK pin is not used, it
must be connected to VDD or VSS.
Continued...
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
PIN AND CIRCUIT DESCRIPTION, continued
PIN 11 (LED)
This open-drain NMOS output is used to directly drive
a visible LED. The load for the low-battery test is applied
to this output. The low-battery test does not occur coinci-
dent with any other test or alarm signal. The LED also
indicates detector status as follows (with component
values as in the typical application, all times nominal):
cycle, IRED pulses every 336 ms (nominal) and amplifier
gain is increased by internal selection of C1. Background
reflections in the smoke chamber can be used to simulate
a smoke condition. After the third IRED pulse, a successful
test (three consecutive simulated smoke conditions)
activates the horn drivers and the I/O pin. When the
push-button is released, the input returns to VSS due to
the internal pull down. After one oscillator cycle, the
amplifier gain returns to normal and after three additional
IRED pulses (less than one second), the device exits this
mode and returns to standby. This high-to-low transition
on pin 16 also resets and starts the 10 minute hush timer
(timer mode).
Standby
- Pulses every 43 seconds.
Local Smoke - Pulses every 0.67 second.
Remote Alarm - No pulses.
Test Mode
Timer Mode
- Pulses every 0.67 second.
- Pulses every 10 seconds.
PIN 12 (OSC. CAP.)
A capacitor between this pin and VDD, along with a
parallel resistor, forms part of a two-terminal oscillator and
sets the internal clock low time. With component values
as shown, this nominal time is 11 ms and essentially the
oscillator period.
Pin Name Pin No. Configuration
I/O
7
Disabled as an output. A logic
high on this pin places the photo
amplifier output on pin 1 or pin 2
as determined by pin 15. The
amplifier output appears as
pulses.
PIN 13 (TIMING RES.)
A resistor between this pin and OSC. CAP. (pin 12) is
part of the two-terminal oscillator and sets the internal
clock high time, which is also the IRED pulse width. With
component values as shown, this nominal time is 105 µs.
PIN 14 (VSS)
HUSH
15
If the I/O pin is high, this pin
controls the amplifier gain capaci
tor. If pin 15 is low, normal gain is
selected and the amplifier output
is on pin 1. If pin 15 is high,
This pin is connected to the most negative supply
potential (usually ground).
PIN 15 (HUSH)
supervisory gain is selected and
the amplifier output is on pin 2.
This input pin serves two purposes in normal opera-
tion. It serves as an enable for the internal 10-minute
(nominal) timer and also as the reference for the smoke
comparator during the timer mode. This reference is
established by a resistive divider between VDD and
STROBE (RX1 and RX2). This allows the detector to have
a different sensitivity set point during the timer mode. If
the timer mode is not used, this pin can be left open or
connected to VSS, which disables this mode.
FEEDBACK 10
OSC. CAP. 12
If pin 7 is high and pin 15 is low
(normal gain), taking this pin to a
high logic level increases the
amplifier gain by ~10% (hyster-
esis).
This pin may be driven by an
external clock source. Driving
this pin low and high drives the
internal clock low and high. The
external RC network may remain
intact.
PIN 16 (TEST)
This pin has an internal pull-down device and is used
to manually invoke two test modes and a Timer Mode.
The Push-to-Test Mode is initiated by a high logic
level on this pin (usually the depression of a normally
open push-button switch to VDD). After one oscillator
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
Pin No. Configuration
HORN1
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.
LED
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
CONNECT FOR TIMER MODE OR "HUSH" OPERATION
V
DD
CONNECT FOR
NON-TIMER MODE
OPERATION
PUSH
TO
TEST
C
1
16
15
14
1
2
3
4
5
6
7
8
C
2
+
9 V
560Ω
V
SS
200kΩ
OSC. &
TIMING
13
12
11
SMOKE
CHAMBER
100kΩ
V
DD
1kΩ
LOGIC
+
1000pF
220kΩ
100µF
10
9
HORN
DRIVER
TO/FROM
OTHER
UNITS
220Ω
Dwg. EC-006
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
STANDBY TIMING DIAGRAM
(not to scale)
OSC. CAP
(PIN 12)
t
osc
INTERNAL
CLOCK
t
ired
IRED
(PIN 6)
t
w(ired)
STROBE
(PIN 4)
t
t
st
w(st)
t
led
LED
(PIN 11)
t
w(led)
SAMPLE
SMOKE
t
horn
WARNING
CHIRP
HORN
ENABLE
t
w(horn)
LOW SUPPLY OR
DEGRADED SENSITIVITY
WARNING CHIRPS ARE OFFSET
NO LOW SUPPLY
CHAMBER SENSITIVITY NORMAL
Dwg. WC-008
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
LOCAL ALARM TIMING DIAGRAM
(not to scale)
t
w(ired)
90%
t
f(ired)
10%
10%
t
t
ired6
t
ired3
ired4
st4
IRED
(PIN 6)
t
t
t
t
t
st6
st3
w(st)
led1
STROBE
(PIN 4)
t
t
led6
w(led)
LED
(PIN 11)
(NO PULSES)
(AS INPUT)
I/O
(PIN 7)
(AS OUTPUT)
(AS OUTPUT)
t
t
t
t
t
on(horn)
r(io)
on(horn)
off(horn)
off(horn)
HORN
ENABLE
LOCAL SMOKE
(REMOTE SMOKE =
DON'T CARE)
REMOTE SMOKE
(NO LOCAL SMOKE)
NO SMOKE
TEST
3RD STROBE WITHOUT SMOKE
3RD STROBE WITH SMOKE
Dwg. WC-009
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
Dimensions in Inches
(controlling dimensions)
0.014
0.008
9
16
0.430
MAX
0.280
0.240
0.300
BSC
1
8
0.100
0.070
0.045
0.005
BSC
MIN
0.775
0.735
0.210
MAX
0.015
0.150
0.115
MIN
0.022
0.014
Dwg. MA-001-16A in
Dimensions in Millimeters
(for reference only)
0.355
0.204
9
16
10.92
MAX
7.11
6.10
7.62
BSC
1
1.77
1.15
8
2.54
0.13
BSC
MIN
19.68
18.67
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
Dwg. MA-001-16A mm
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.
5358
PHOTOELECTRIC SMOKE DETECTOR
with INTERCONNECT and TIMER
SAFETY & SECURITY ICs
SELECTION GUIDE
Part
Number
Function
A3054KU/SU
A5347CA
A5348CA
A5349CA
A5350CA
A5358CA
Multiplexed Two-Wire Hall-Effect Sensor
Ionization-Type Smoke Detector with Interconnect and Timer
Ionization-Type Smoke Detector with Interconnect, Timer, and Reverse-Battery Protection
Ionization-Type Smoke Detector with Interconnect and Timer for AC Line Operation
Ionization-Type Smoke Detector with Interconnect and Reverse-Battery Protection
Photoelectric-Type Smoke Detector with Interconnect and Timer
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from
the detail specifications as may be required to permit improvements in the design of its products.
The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or
other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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