A5366
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
▪
Temporal Horn Pattern, per UL217, NFPA72, and ISO8201
▪
UL Recognized for UL217 applications, per file #S2113
Description
The A5366 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
recognized by Underwriters Laboratories for use in smoke
alarms that comply with Standard UL217.
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 A5366 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.
Packages:
16-pin DIP
(Package A)
16-pin SOICW
(Package LW)
Not to scale
Typical Application Diagram
V
DD
0.047
μF
Rx1
A
8.2 kΩ
5 kΩ
Rx2
4.7 kΩ
4700 pF
560
Ω
1
2
9V
A5366
TEST 16
Push-to-Test
HUSH
VSS
TIMING RES
1 kΩ
Smoke
Chamber
22
Ω
100
μF
220
Ω
8
6
7
IRED
I/O
HORN1
OSC CAP
LED
15
14
13
100 kΩ
12
11
220 kΩ C
1000 pF
C
1.5 MΩ C
330
Ω
B
1500 pF
10 MΩ
Red LED
A
Connect to allow timer mode
("hush") operation
22
μF
C1
C2
200 kΩ
3
DETECT
4 STROBE
5
VDD
B Connect HUSH to VSS
to disable timer mode
C Value of component can vary,
based on the piezoelectric horn used
10
FEEDBACK
HORN2 9
Piezo Horn
To / from
other units
26110.11-DS, Rev. E
A5366
Selection Guide
Part Number
A5366CA
A5366CA-T
A5366CLWTR-T
Pb-free
–
Yes
Yes
Photoelectric Smoke Detector
with Interconnect and Timer
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
Supply Voltage Range
Input Voltage Range
Input Current
Operating Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Symbol
V
DD
V
IN
I
IN
T
A
T
J
(max)
T
stg
Range C
Referenced to V
SS
Referenced to V
SS
Notes
Rating
–0.5 to 15
–0.3 to V
DD
+0.3
10
–25 to 75
150
–55 to 125
Units
V
V
mA
ºC
ºC
ºC
*CAUTION: CMOS 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
R
θJA
Test Conditions*
Package A, on 4-layer PCB based on JEDEC standard
Package LW, on 4-layer PCB based on JEDEC standard
Value
38
48
Units
ºC/W
ºC/W
*Additional thermal information available on Allegro website.
Terminal List Table
Number
Name
Function
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
C1
C2
DETECT
STROBE
VDD
IRED
I/O
HORN1
HORN2
FEEDBACK
LED
OSC CAP
TIMING RES
VSS
HUSH
TEST
Sets photoamplifier gain in supervisory mode
Sets photoamplifier gain in standby mode
Photoamplifier input
Strobed supply (V
DD
– 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
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
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A5366
Photoelectric Smoke Detector
with Interconnect and Timer
Functional Block Diagram
I/O
+Supply
9V
VDD
Band-gap
Reference
VDD
FEEDBACK
HORN2
+
_
Low Battery
HORN1
Logic
DETECT
Photoamp
+
_
LED
V
DD
C1
Power-On
Reset
C2
TIMING RES
OSC CAP
VSS
V
DD
STROBE
VDD
IRED
Oscillator
and Timing
–Supply
HUSH
TEST
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A5366
Photoelectric Smoke Detector
with Interconnect and Timer
Symbol
V
DD
Average in standby mode, configured per
typical application
Test Conditions
Test Pin
5
5
5
5
7
V
DD
–
12
12
12
9
9
9
9
9
9
9
9
12
12
12
12
12
9
9
12
6.5
6.5
6.5
6.5
12
9
–
–
12
9
Min.
6.0
–
–
–
–
–
–
–
3.2
6.3
8.5
1.6
–
–
–
–
–
0.25
20
–
–
–
–
5.5
V
DD
– 0.1
V
DD
– 5.25
–
–
–
2.85
Typ.
2
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
0.5
–
–
–
–60
0.01
–
3.1
Max.
12
9
2.0
3.0
1.5
2.7
7.0
0.5
–
–
–
–
100
100
–100
–100
–1.0
10
80
140
0.6
1.0
–
–
–
V
DD
– 4.75
–
–
0.1
3.35
Units
V
μA
mA
mA
V
V
V
V
V
V
V
V
nA
nA
nA
nA
μA
μA
μA
μA
V
V
V
V
V
V
dB
%/°C
V
V
DC ELECTRICAL CHARACTERISTICS
at T
A
= –25°C to 75°C
1
. V
SS
= 0 V, in typical application (unless otherwise noted)
Characteristic
Supply Voltage Range
Operating Supply Current
I
DD
During STROBE on, IRED off, configured per
typical application
During STROBE on, IRED on, configured per
typical application
Low-Level Input Voltage
V
IL
10
16
15
7
10
16
15
V
IN
= V
DD
, STROBE active, OSC CAP = V
DD
V
IN
= V
DD
V
IN
= V
ST
, STROBE active, OSC CAP = V
DD
1, 2
3, 10, 12
1, 2, 3
10, 12
15, 16
16, 15
7
7
11
8, 9
13
8, 9
4
4
4
4
6
6
High-Level Input Voltage
V
IH
Input Leakage High
I
IH
Input Leakage Low
I
IL
V
IN
= V
SS
V
IN
= V
DD
Input Pull-Down Current
I
IN
No local smoke, V
IN
= V
DD
No local smoke, V
IN
= 17 V
I
O
= 10 mA
Low-Level Output Voltage
High-Level Output Voltage
V
OL
V
OH
I
O
= 16 mA
I
O
= 5 mA
I
O
= –16 mA
Inactive, I
O
= –1
μA
Strobe Output Voltage
V
ST
Active, I
O
= 100 to 500
μA
Line Regulation
Strobe Temperature
Coefficient
IRED Output Voltage
ΔV
ST(ΔVDD)
α
ST
V
IRED
Active, V
DD
= 6 to 12 V
V
DD
= 6 to 12 V
Inactive, I
O
= 1
μA,
T
A
= 25°C
Active, I
O
= –6 mA, T
A
= 25°C
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A5366
Photoelectric Smoke Detector
with Interconnect and Timer
DC ELECTRICAL CHARACTERISTICS (continued)
at T
A
= –25°C to 75°C
1
,
V
SS
= 0 V, in typical application (unless otherwise noted)
Characteristic
Line Regulation
IRED Temperature Coefficient
High-Level Output Current
OFF Leakage Current High
OFF Leakage Current Low
Low-Battery Alarm Threshold
Common Mode Voltage
Smoke Comparator
Reference Voltage
1
Limits
2
Typical
Symbol
ΔV
IRED(ΔVDD)
α
IRED
I
OH
I
OZ
I
OZ
V
DD(th)
V
IC
V
REF
Test Conditions
Active, V
DD
= 6 to 12 V
V
DD
= 6 to 12 V
V
DD
= Alarm, I/O active,V
O
= V
DD
– 2 V
V
O
= V
DD
V
O
= V
SS
Test Pin
6
6
7
11, 13
11, 13
5
V
DD
–
9
12
12
–
-
-
Min.
–
–
–4.0
–
–
6.9
V
DD
–4
V
DD
– 3.7
Typ.
2
–35
0.40
–
–
–
7.2
–
–
Max.
–
–
–
1.0
–1.0
7.5
V
DD
–2
V
DD
– 3.3
Units
dB
%/°C
mA
μA
μA
V
V
V
Any alarm condition
Any alarm condition
1, 2, 3
Internal
over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only.
values are at 25°C and are given for circuit design information only.
AC ELECTRICAL CHARACTERISTICS
at T
A
= –25°C to 75°C
1
. V
SS
= 0 V, in typical application (unless otherwise noted)
Characteristic
Oscillator Period
Symbol
t
osc
t
led1
t
led3
LED Pulse Period
t
led4
t
led6
t
led7
LED Pulse Width
t
w(led)
t
st1
t
st2
t
st3
STROBE Pulse Period
t
st4
t
st5
t
st6
STROBE Pulse Width
t
w(st)
No local or remote smoke
After 1 of 3 valid samples
After 2 of 3 valid samples and during local
alarm
Remote smoke only
Chamber test or low battery test, no local
alarm
Pushbutton test, induced alarm
No local or remote smoke
Local smoke
Remote smoke only
Pushbutton test, induced alarm
Timer mode, no alarm
Test Conditions
Test Pin
12
11
11
11
11
11
11
4
4
4
4
4
4
4
V
DD
9
9
9
9
9
9
9
9
9
9
9
9
9
9
Min.
9.4
39
0.45
–
0.45
9.67
9.5
9.6
1.8
0.8
7.2
38.9
225
9.5
Typ.
2
10.5
–
0.50
No LED
Pulses
0.50
10.75
–
–
2.0
1.0
8.0
–
252
–
Max.
11.5
48
0.55
–
0.55
11.83
11.5
11.9
2.2
1.1
8.9
47.1
278
11.5
Units
ms
s
s
s
s
s
ms
s
s
s
s
s
ms
ms
Continued on the next page…
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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