A5303 반도체 회로 부품 판매점
Photoelectric Smoke Detector
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 Allegro |
A5303
Photoelectric Smoke Detector
with Interconnect, Timer, and Latching Alarm Indicator
Features and Benefits
▪ Low average standby current allows 10-year battery life
▪ 2.3 to 5.5 V operating range
▪ Interconnect option
▪ Logic outputs to control an external sound IC
▪ Low battery detection and warning
▪ Chamber sensitivity test and warning
▪ Triple horn-chirp to distinguish chamber warning
▪ Power-on reset (POR)
▪ Digital filter on I/O provides significant noise immunity
▪ Timer (hush) mode for enabling reduced sensitivity period
▪ Built-in circuits to reduce false triggering
▪ ESD protection circuitry on all pins
▪ Temporal Horn Pattern, per UL217, NFPA72, ISO8201
▪ Latching alarm indicator identifies alarm-initiating devices
Packages:
20-pin TSSOP
(LE package)
Not to scale
Description
The A5303 is a low-current BiCMOS photoelectric smoke
detector circuit with ultra-low standby current and can operate
for 10 years powered by inexpensive batteries. This device can
be used with an infrared optical chamber to sense light scattered
from smoke particles. A networking capability allows 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.
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 45% to provide
hysteresis. High gain is used during pushbutton test and to
periodically monitor the chamber sensitivity during standby.
The internal oscillator and timing circuitry minimize standby
power by sensing for smoke for only 100 μs once 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 to occur.
20-contact QFN
4 mm × 4 mm × 0.75 mm
(ES package)
TheA5303 is supplied in a thin profile (<1.2 mm overall height)
20-pin TSSOP (LE) package (0.65 mm nominal lead pitch)
and a 20-contact QFN (ES) package with exposed thermal
pad. Both packages are lead (Pb) free with 100% matte tin
leadframe plating.
Typical Application Diagram
VDD
R1 3 kΩ
5 kΩ
R2
56 nF
5.6 nF 560 Ω
200 kΩ
C1
C2
DETECT
1 kΩ
VDD
100 µF
Smoke
Chamber
3Ω
STROBE
IRED
ISET
Connect HUSH to
VSS to disable
timer mode
HUSH
VSS
To / from
other units
220 Ω
Gain
Select
VDD -
1.6 V
VDD 1.2 V
Low Batt
Control
Logic
VDD
LVSET
Low Batt
Sample
TEST
BLINK
SOUT0
SOUT1
SOUT2
HORN
LED
VDD 3 V
10 µF
A
Push-to-test
B
Voice IC outputs
Output to optional
boost converter to
drive a piezo horn
Red LED
A
A resistor connected
between this pin and
VDD or VSS adjusts
the low-battery threshold
B In standby, BLINK = VDD
causes LED to blink,
BLINK = V SS causes
LED not to blink
OSC
Timing
OSCCAP
TRES
100 kΩ
1500 pf
10 ΜΩ
5303-DS, Rev. 1
A5303
Selection Guide
Part Number
A5303SESTR-T
A5303SLE-T
A5303SLETR-T
Photoelectric Smoke Detector
with Interconnect, Timer, and Latching Alarm Indicator
Pb-free and RoHS
Yes
Yes
Yes
Package
20-contact QFN
20-pin TSSOP (JEDEC MO-153AC)
20-pin TSSOP (JEDEC MO-153AC)
Packing
1500 pieces / 7-in. reel
75 pieces / tube
4000 pieces / reel
Absolute Maximum Ratings
Characteristic
Supply Voltage Range
DC Input Voltage Range
Operating Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Symbol
VDD
VIN
TA
TJ(max)
Tstg
Referenced to VSS
Referenced to VSS
Allegro Range S
Notes
Rating
–2.3 to 6
–0.3 to 6
–20 to 85
150
–55 to 150
Units
V
V
ºC
ºC
ºC
Thermal Characteristics
Characteristic
Package Thermal Resistance
Symbol
RθJA
Test Conditions*
ES Package, 4-layer PCB, based on JEDEC standard
LE Package, estimated, single-layer PCB, minimal exposed copper area
*Additional thermal information available on Allegro website.
Value Units
37 ºC/W
127 ºC/W
Pin-out Diagram
IRED
STROBE
DETECT
C2
C1
1
2
3
4
5
PAD
15 SOUT0
14 SOUT1
13 SOUT2
12 LED
11 HORN
ES Package
SOUT1 1
SOUT0 2
I/O 3
BLINK 4
HUSH 5
ISET 6
VDD 7
IRED 8
STROBE 9
DETECT 10
20 SOUT2
19 LED
18 HORN
17 TEST
16 OSC CAP
15 VSS
14 TRES
13 LVSET
12 C1
11 C2
LE Package
Terminal List
Number
ES LE
14 1
15 2
16 3
17 4
18 5
19 6
20 7
18
29
3 10
4 11
5 12
6 13
7 14
8 15
9 16
10 17
11 18
12 19
13 20
PAD
–
Name
SOUT1
SOUT0
I/O
BLINK
HUSH
ISET
VDD
IRED
STROBE
DETECT
C2
C1
LVSET
TRES
VSS
OSC CAP
TEST
HORN
LED
SOUT2
–
Function
Logic push-pull output for controlling an external sound IC
Logic push-pull output for controlling an external sound IC
Input-output to interconnected detectors
Logic input for enabling/disabling the LED blink during standby
Input for photoamplifier timer mode reference; can also disable timer mode
A resistor on this pin connected to VSS sets the IRED output current
Positive supply voltage
Terminal to drive smoke chamber IR LED
Strobed supply (VDD – 2 V) for photoamplifier low-side reference
Photoamplifier input
Sets photoamplifier gain in standby mode
Sets photoamplifier gain in supervisory mode
Optionally used with a resistor to adjust the low-battery threshold
Connection for resistor to set clock times/frequency
Negative supply voltage
Connection for capacitor and resistor to set clock times/frequency
Enables push-to-test mode; starts timer mode, if enabled
Logic output which optionally enables a boost converter to drive a horn
Output to drive visible LED
Logic push-pull output for controlling an external sound IC
Exposed pad for enhanced thermal dissipation
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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제조업체: Allegro
( allegro )
A5303 detector
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