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BL59A12/BL59S12
PHOTOELECTRIC SMOKE DETECTOR IC
1. Product description 1.1 Basic function: BL59A12 (BL59S12) 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 12V Average supply current: 8uA Operating temperature range: -10 60 Ideal for battery powered applications. 3. Block diagram of this IC
4.Pin assignment
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BL59A12/BL59S12
5.Pin description Pin Symbol No. 1,2 C1, C2 Input/output External capacitor connection I Detecting input Strobe Power supply O Output signal 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 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.
3
DETECT
4 5,14 6
STROBE VDD, GND IRED
O
7
I/O BRASS, SILVER FEEDBACK LED
Input/output Push-pull driver's output Feedback terminal Output signal Oscillator's input External R and C connecting terminal I Low voltage detecting input
8,9 10 11
O I O
12
OSC
I
13
R1
15
LOW-SUPPLY
16
TEST
I
Test terminal
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 into the unit. Under smoke status, the unit activates I/O driver to send a signal to its interconnected units to activate remote alarm.
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BL59A12/BL59S12
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 VDD 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 Limits -0.5 +12 -0.25 Vdd+0.25 -0.25 Vdd+0.25 -0.25 Vdd+0.25 -15 +15 -1.0 Vdd+0.25 10 25 +25/-150 1200 350 -55 125 mA mA mA mW Units
VIN DC input voltage
V
IIN IOUT IDD PD TSTG
7.2 DC Electrical characteristics(Ta=25,VSS as reference, unless otherwise indicated) Symbol VDD VTH Parameters Power supply voltage range Supply threshold voltage, Low supply alarm voltage Average supply current Test condition VDD -Low supply trip voltage VIN = VDD/3 Standby, (See sample figure) Strobe on, IRED off (See sample figure) Min. 6.0 6.5 Max. 12 7.8 Unit V V
IDD
12
--
8
uA
iDD
Supply peak current Low level input voltage, I/O Feedback Test High level input voltage I/O Feedback Test Input current OSC, Detect Low supply trip Feedback Low level input current TEST Pull-down current Test I/O
12
--
2.0
mA
VIL
9.0 9.0 9.0 9.0 9.0 9.0 VIN = VSS or VDD VIN = VSS or VDD VIN = VSS or VDD VIN = VSS VIN = VDD No local smoke, VIN = VDD No local smoke, VIN = 17V
-3-
1.5 2.7 7.0 3.2 6.3 8.5 100 100 100 -1 0.5 25 -10 100 140
V
VIH
V
IIN
12 12 12
nA
IIL
12 9.0 9.0 12
uA
IIH
uA
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BL59A12/BL59S12
VOL VOH Low level output voltage, LED Silver, Brass High level output voltage Silver, Brass IOUT = 10mA IOUT = 16mA 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 6.5 6.5 6.5 9.0 5.5 VDD-0.1 VDD-4.4 Vdd-5.6 V 9.0 2.25 0. 1 3.75 0.6 1.0 V V
Strobe VOUT Output voltage (See pin description) IRED
6.5
-4
-mA
IOH
High-level output current, I/O
12
--
-16
IOZ
Output off-state leak current, LED Common-mode voltage range C1, C2, Detect Internal reference voltage of smoke comparator
12
-
1
uA
VIC
--
VDD -4
VDD -2
V
VREF
--
VDD-3.08
VDD-3.92
V
7.3 AC ELECTRICAL CHARACTERISTICS (TA= 25,VDD = 9.0 V, Component Values: R1 = 100.0 K, C3 = 1500.0 pF, R2 = 7.5 M) Symbol 1/fosc Parameters Oscillator Period Test condition Free-Running Sawtooth Measured at Pin 12 No Local Smoke, and No Remote Smoke Remote Smoke, but No Local Smoke Local Smoke or Pushbutton Test Clocks 1 Min
*
Typ
**
Max 8.6
*
Unit ms
7.0
7.9
4096
28.8
32.4
35.2
s
tLED
LED Pulse Period
64 1 0.45 7.0 7.2 28.8 0.9 94
Extinguished 0.5 8.1 32.4 1.0 0.55 8.6 8.8 35.2 1.1 116 s ms
tw(LED), tw(stb)
LED Pulse Width and Strobe Pulse Width Smoke Test Chamber Sensitivity Test, without Local Smoke Pushbutton Test
1024 4096 128 Tf*
tIRED
IRED Pulse Period
tw(IRED)
IRED Pulse
-4-
us
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BL59A12/BL59S12
tr tf ton toff toffd tCH Width IRED Rise Time IRED Fail Time Silver and Brass Temporal Modulation Pulse Silver and Brass Chirp Pulse Period Silver and Brass Chirp Pulse Width Rising Edge on I/O to Smoke Alarm Response Time Low Supply or Degraded Chamber Sensitivity 64 192 4096 0.45 0.45 1.35 28.8 30 200 0.55 0.55 1.65 35.2 us us s
0.5 0.5 1.52 32.4
s
twCH
1
7.0
7.9
8.6
ms
tRR
Remote Smoke, No Local Smoke Smoke Test Chamber Sensitivity Test, without Local Smoke Low Supply Test, Without Local Smoke Pushbutton Test
1024 4096
7.2 28.8
2! 8.1 32.4
8.8 35.2
ms
tstb
Strobe Out Pulse Period
s 4096 28.8 32.4 1 35.2 -
*Oscillator period T (= Tr + Tf) is determined by the external components R1, R2, and C3 where Tr = (0.6931) R2 * C3 and Tf = (0.6931) R1 * C3. The other timing characteristics are some multiple of the oscillator timing as shown in the table. **Typicals are not guaranteed. Time is typical - depends on what point in cycle signal is applied.
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BL59A12/BL59S12
8.Application sample figure
VDD VDD R8* D1 C4 BT1 VDD
6. 8k
R9* C1 C2 4.7n R11 R10* D2
47uF 47n
R14
9V
TEST R7
5k
6.8K
1 2 3
C1 C2
Test LowSupplyTrip Vss R1 Osc LED Freedback SILVER
16 15 14 13 12 11 10 9 R5* R1 R2 C3 VDD
10 0 K
250K IR Detector
4. 7
R12 VDD D3 A
Detect Strobe Vdd IRED Brass
7.5M 100K
R3 R6
4 5 6 7 8
1500pf
D4 A U2 C6
1k
C5
VDD Q1
47 K Visible LED
100uF
IR Emitter
R13*
470
R4*
4.7to22
100K
0.01uf 2.2M BUZZE R
3 2 1 com
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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BL59A12/BL59S12
10. Package BL59A12
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BL59A12/BL59S12
BL59S12
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