BL59A10/BL59S10
Shanghai Belling Co., Ltd.
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:
Power supply range:
6V
½
12V
Average supply current:
12uA
Operating temperature range:
-10
½
60℃
Ideal for battery powered applications.
3. Block diagram of this IC
C1 C2
1 2
DETECT
3
AMP
REF1
COMP
I/O
7
ALARM
LOGIC
8
9
10
BRASS
SILVER
FEEDBACK
0SC
R1
12
13
TIMING
LOGIC
REF2
6
11
IRED
LED
TEST 16
STROBE
LOW-SUPPLY
7
15
COMP
PIN5=Vdd
PIN14=Vss
4. Pin assignment
C1
C2
Detect
Strobe
Vdd
IRED
I/O
Brass
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Test
Low-Supply
Vss
R1
Osc
LED
Feedback
Silver
2004.7
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BL59A10/BL59S10
5.Pin description
Pin
Symbol
No.
1,2
C1,C2
Shanghai Belling Co., Ltd.
Input/output
External
capacitor
connection
I
Detecting input
Functions
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 V
DD
.
When output = V
DD
-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 V
SS
(low) by pull-down device.
3
DETECT
4
5,14
6
STROBE
V
DD
,GND
IRED
O
Strobe
Power supply
O
Output signal
7
I/O
Input/output
Push-pull
driver’s
output
Feedback
terminal
8,9
BRASS,SILVER
O
10
FEEDBACK
I
11
LED
O
Output signal
12
OSC
I
Oscillator’s
input
External R and C
connecting
terminal
13
R1
15
LOW-SUPPLY
I
Low voltage
detecting input
16
TEST
I
Test terminal
2004.7
Page 2 of 2
BL59A10/BL59S10
Shanghai Belling Co., Ltd.
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 V
SS
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 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(V
SS
as reference)
Symbol
Parameter
V
DD
Supply voltage
C1, C2, Detect
OSC, low-supply trip
I/O
Feedback
Test
DC input current
DC output current
Supply current
Power dissipation in still air, 5Sec
Continuous
Storage temperature
Soldering temperature
Limits
-0.5
½
+12
-0.25
½Vdd+0.25
-0.25
½Vdd+0.25
-0.25
½Vdd+0.25
-15
½+15
-1.0
½Vdd+0.25
±10
±25
+25/-150
1200
350
-55
½125
260
Units
V
IN
DC input voltage
V
I
IN
I
OUT
I
DD
PD
TSTG
TL
mA
mA
mA
mW
℃
℃
2004.7
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BL59A10/BL59S10
Shanghai Belling Co., Ltd.
7.2 Electrical characteristics(Ta = 25℃, V
SS
as reference, unless otherwise indicated)
Min.
Max.
Unit
Symbol
Parameters
Test condition
V
DD
V
DD
Power supply voltage range
--
6.0
12
V
Low supply trip
Supply threshold voltage,
voltage
V
TH
6.5
7.8
V
Low supply alarm voltage
V
IN
= V
DD
/3
Standby,
I
DD
Average supply current
(See sample
12
--
12
uA
figure)
Strobe on,
IRED off
12
--
2.0
mA
i
DD
Supply peak current
(See sample
figure)
Low level input voltage,
9.0
1.5
I/O
9.0
2.7
V
V
IL
Feedback
9.0
7.0
Test
High level input voltage
3.2
9.0
I/O
6.3
V
9.0
V
IH
Feedback
8.5
9.0
Test
Input current
OSC,
V
IN
= V
SS
or V
DD
12
±100
Detect
12
±100
nA
V
IN
= V
SS
or V
DD
I
IN
Low supply trip
12
±100
V
IN
= V
SS
or V
DD
Feedback
Low level input current
I
IL
V
IN
= V
SS
12
-1
TEST
uA
V
IN
= V
DD
10
0.5
No local smoke, V
IN
9.0
Pull-down current
Test
100
uA
25
9.0
I
IH
= V
DD
I/O
140
--
12
No local smoke,
V
IN
= 17V
Low level output voltage,
I
OUT
= 10mA
6.5
0.6
V
OL
LED
V
I
OUT
= 16mA
6.5
1.0
Silver, Brass
High level output voltage
V
OH
I
OUT
= -16mA
-
Silver, Brass
6.5
5.5
V
Inactive,
V
DD
-0.1
-
I
OUT
= -1uA
Active, I
OUT
=
Strobe
Output
9.0 V
DD
-4.4 Vdd-5.6
100uA to 500uA
voltage
V
(load regulation)
V
OUT
(See
pin
Inactive,
description)
I
OUT
=-1uA
-
-
0. 1
IRED
Active, I
OUT
=6uA 9.0
2.25
3.75
(load regulation)
2004.7
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BL59A10/BL59S10
Local smoke,
V
OUT
=4.5V
Local smoke,
V
OUT
= V
SS
(short-circuit
current)
V
OUT
= V
SS
or V
DD
Local smoke,
Pushbutton test or
chamber
sensitivity test
Local smoke,
pushbutton test or
chamber
sensitivity test
6.5
Shanghai Belling Co., Ltd.
-4
--
mA
I
OH
High-level output current,
I/O
12
--
-16
I
OZ
Output off-state leak
current,
LED
Common-mode voltage range
C1, C2, Detect
12
-
±1
uA
V
IC
--
V
DD
-4
V
DD
-2
V
V
REF
Internal reference voltage
of smoke comparator
--
V
DD
-3.08
V
DD
-3.92
V
2004.7
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