BELLING BL59A10 Photoelectric smoke detector ic Datasheet

BL59A10/BL59S10
PHOTOELECTRIC SMOKE DETECTOR IC
1. Product description
1.1. Basic function:
BL59A10/BL59S10 is a CMOS LSI used for smoke detection. Ultra-low power analog and
digital circuits are contained in it. Combined with an IR photoelectric chamber, this IC is used to
detect smoke through receiving light scattered by tiny smoke particles going into the chamber.
When smoke is detected, A burst of alarm sounds are generated by an external piezoelectric
buzzer driven by the push-pull output of this IC.
1.2. Applications:
Smoke detection system.
2. Features:
6V ~ 12V
Power supply range:
Average supply current:
12uA
Operating temperature range:
-10 ~ 60℃
Ideal for battery powered applications.
3. Block diagram of this IC
I/O
C1 C2
1 2
3
DETECT
7
AMP
REF1
0SC
LOGIC
12
13
TIMING
TEST 16
LOGIC
R1
ALARM
COMP
8
9
10
6
11
BRASS
SILVER
FEEDBACK
IRED
LED
REF2
PIN5=Vdd
7
STROBE
LOW-SUPPLY
COMP
15
PIN14=Vss
4. Pin assignment
C1
1
16
Test
C2
2
15
Low-Supply
Detect
3
14
Vss
Strobe
4
13
R1
Vdd
5
12
Osc
IRED
6
11
LED
I/O
7
10
Feedback
Brass
8
9
Silver
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BL59A10/BL59S10
5.Pin description
Pin
Symbol
No.
Input/output
Functions
External capacitor
connection
1,2
C1, C2
3
DETECT
I
Detecting input
4
STROBE
O
Strobe
5,14
VDD, GND
6
IRED
7
I/O
8,9
BRASS,
SILVER
O
Push-pull
output
10
FEEDBACK
I
Feedback terminal
11
LED
O
Output signal
12
OSC
I
Oscillator’s input
13
R1
15
LOW-SUPPLY
I
Low
voltage
detecting input
16
TEST
I
Test terminal
Power supply
O
Output signal
Input/output
driver’s
External R and C
connecting
terminal
By connecting external capacitor, a
voltage feedback amplifier is formed.
The gain of it is determined by
capacitor’s value.
Connect a photodiode to supply a
signal to the internal comparator.
A strobe voltage output, referenced to
VDD.
When output = VDD -5V, it enables
other internal circuits.
To supply the power
To output pulse drive signal for external
NPN transistor which drives a IR
photodiode.
It can be used to connect up to 40
detectors to make auxiliary alarm,
remote alarm, auto-dialer…
Push-pull driver outputs signal to drive
external buzzer to alarm, and to show
various operation states.
To feed ‘silver’ signal back to the
push-pull output driver circuit’s input
It is an open drain output, can drive
LED directly. The LED can tell the
detector’s various operation states.
Connected to external R and C, which
determine the internal oscillator’s
frequency.
Connected to external R and C, which
determine the output pulse period of
IRED.
It connected to external resistor divider
between VDD and LED to get a low
supply alarm threshold voltage
This pin is normally low by an internal
pull-down device. When it is set high,
the IC enters into a simulated-smoke
condition. When floating, this pin
comes back to VSS (low) by pull-down
device.
6. Function of this IC:
6.1. The variable gain photoelectric amplifier is directly connected to IR detector (photodiode).
The amplifier’s gain is determined by external capacitors C1 and C2. During standby, the
amplifier’s gain is at minimum. Under smoke condition, the amplifier’s gain is at medium.
Entering into test condition, the amplifier’s gain is at maximum. Additionally, under standby
state, if the special supervisory circuit is activated to check the chamber’s sensitivity, the
amplifier’s gain is also at its maximum.
6.2. Using VSS as its reference, the I/O pin can be used to connect up to 40 units together.
When I/O pin is used as an input, its on-chip pull-down resistor can prevent noise from entering
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BL59A10/BL59S10
into the unit. Under smoke status, the unit activates I/O driver to send a signal to its
interconnected units to activate remote alarm.
6.3. Display method: LED (connected to LED pin) flashing combined with alarm sound,
indicates a LOCAL SMOKE condition. Only pulsating alarm sound without LED flashing
indicates a REMOTE SMOKE condition.
7. Specifications:
7.1. Absolute maximum ratings(VSS as reference)
Symbol
Parameter
Limits
VDD
VIN
DC input voltage
IIN
IOUT
IDD
PD
TSTG
Units
Supply voltage
-0.5 ~ +12
C1, C2, Detect
OSC, low-supply trip
I/O
-0.25 ~Vdd+0.25
-0.25 ~Vdd+0.25
-0.25 ~Vdd+0.25
Feedback
-15 ~+15
Test
DC input current
DC output current
Supply current
Power dissipation in still air, 5Sec
Continuous
Storage temperature
-1.0 ~Vdd+0.25
±10
±25
+25/-150
1200
350
-55 ~125
V
mA
mA
mA
mW
℃
7.2 Electrical characteristics(Ta = 25℃
℃, VSS as reference, unless otherwise indicated)
Symbol
VDD
Parameters
Power supply
range
Test condition
voltage
VTH
Supply threshold voltage,
Low supply alarm voltage
IDD
Average supply current
iDD
Supply peak current
VIL
VIH
IIN
Low supply trip
voltage
VIN = VDD/3
Standby,
(See
sample
figure)
Strobe on,
IRED off
(See
sample
figure)
Low level input voltage,
I/O
Feedback
Test
High level input voltage
I/O
Feedback
Test
Input current
Detect
Low supply trip
Feedback
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OSC,
VDD
Min.
Max.
Unit
--
6.0
12
V
6.5
7.8
V
12
--
12
uA
12
--
2.0
mA
1.5
2.7
7.0
V
9.0
9.0
9.0
9.0
9.0
9.0
VIN = VSS or
VDD
VIN = VSS or
VDD
VIN = VSS or
VDD
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12
12
12
3.2
6.3
8.5
V
±100
±100
±100
nA
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Wrote by 2006
BL59A10/BL59S10
IIL
IIH
VOL
VOH
Low level input current
TEST
VIN = VSS
12
Pull-down current Test
I/O
VIN = VDD
No local smoke,
VIN = VDD
No local smoke,
VIN = 17V
9.0
9.0
12
IOUT = 10mA
IOUT = 16mA
6.5
6.5
Low level output voltage,
LED
Silver, Brass
High level output voltage
Silver, Brass
Strobe
VOUT
Output
voltage
(See
pin
description)
IRED
IOH
High-level output current,
I/O
IOZ
Output
current,
LED
off-state
VIC
Common-mode
range
C1, C2, Detect
VREF
Internal reference voltage
of smoke comparator
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leak
voltage
IOUT = -16mA
Inactive,
IOUT = -1uA
Active, IOUT =
100uA to 500uA
(load regulation)
Inactive,
IOUT =-1uA
Active,
IOUT
=6uA
(load regulation)
Local smoke,
VOUT =4.5V
Local smoke,
VOUT = VSS
(short-circuit
current)
VOUT = VSS or
VDD
Local
smoke,
Pushbutton test
or
chamber
sensitivity test
Local
smoke,
pushbutton test
or
chamber
sensitivity test
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0.5
25
--
6.5
5.5
-
VDD -0.1
9.0
VDD -4.4
uA
10
100
140
uA
0.6
1.0
V
-
V
Vdd-5.6
V
9.0
2.25
1
3.75
6.5
-4
--
12
--
-16
12
-
±1
uA
--
VDD -4
VDD -2
V
--
VDD-3.08
VDD-3.92
V
mA
8/28/2006
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BL59A10/BL59S10
8. Application sample figure
VDD
VDD
R8*
D1
C4
6.
8k
TEST
C1
R14
1
6.8K
R11
2
250K
R10*
D2
3
4.
7
IR
Detector
R12
D3
1k
A
VDD
IR
Emitter
C5
100uF
R7
47n
C2 4.7n
5k
VDD
9V
47uF
R9*
VDD
BT1
R13*
4.7to22
Q1
4
5
6
7
8
C1
Test
C2
LowSupplyTrip
Detect
Vss
Strobe
R1
Vdd
Osc
IRED
I/O
LED
Freedback
Brass
SILVER
3
2
1
10
0
K
16
15
13
12
11
10
VDD
R2
14
10M
R1
C3
R6
100K
R3
470
1500pf
D4
A
9
Visible
LED
U2
R4*
100K
47
K
C6
0.01uf
R5*
2.2M
BUZZE
R
com
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Total 8 Pages
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BL59A10/BL59S10
9. Calibration:
To enter calibration mode, pin16 (TEST) must be below VSS, pulling more than 100uA
continuously out of the pin for at least one OSC cycle. To exit this mode, the TEST pin is floated
at least one OSC cycle.
Table. Configuration of pins in the calibration mode
Description
PIN Comments
Forcing this pin = VDD, places photo amp’s output on pin2 when pin15=
I/O
7
VDD, or on pin1 when pin15= VSS.
Low: normal gain of photo amplifier on pin1.
Low-supply
15
High: supervisory gain on pin2.
When pin15=low, driving it high enables gain with a hysteresis in the
Feedback
10
photo amp.
OSC
12
It equals to internal clock.
This pin becomes smoke comparator’s output. Positive pulses indicate
Silver
9
that smoke has been detected. A static low level indicates no smoke.
This pin becomes the smoke integrator’s output. Static high level means
Brass
8
two consecutive smoke detections. Static low level means two
no-detections.
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BL59A10/BL59S10
Package
BL59A10
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Total 8 Pages
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BL59A10/BL59S10
BL59S10
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