Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet BL59A12 PHOTOELECTRIC SMODE DETECTOR IC 1. Product description 1.1 Basic function: BL59A12 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. 1.2 Applications 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 I/O C1 C2 1 2 DETECT 3 7 AMP REF1 0SC 12 R1 13 TIMING 16 LOGIC TEST ALARM COMP LOGIC 8 9 10 6 11 BRASS SILVER FEEDBACK IRED LED REF2 STROBE LOW-SUPPLY PIN5=Vdd 7 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 1 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet 5.Pin description 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 driver’s output 10 FEEDBACK I Feedback terminal 11 LED O Output signal 12 OSC I Oscillator’s input 13 R1 15 LOWLOW-SUPPLY I Low voltage detecting input 16 TEST I Test terminal Power supply O Output signal Input/output 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 2 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet 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 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. 6.4 Typical Timing Standby Timing Diagram 3 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet Smoke Timing Diagram 7. Specifications: 7.1. Absolute maximum ratings(VSS as reference) Symbol Parameter VDD VIN DC input voltage IIN IOUT IDD PD TSTG TL Limits 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 Soldering temperature -1.0 ～Vdd+0.25 ±10 ±25 +25/-150 1200 350 -55 ～125 260 Units V mA mA mA mW ℃ ℃ 7.2 Electrical characteristics(Ta = 25℃ 25℃, VSS as reference, unless otherwise indicated) Symbol Parameters Test condition VDD Min. Max. Unit VDD Power supply voltage range -6.0 12 V Low supply trip Supply threshold voltage, VTH voltage 6.5 7.8 V Low supply alarm voltage VIN = VDD/3 Standby, IDD Average supply current 12 -8 uA (See sample 4 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet iDD VIL VIH IIN IIL IIH VOL VOH VOUT 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 I/O Test Low level output voltage, LED Silver, Brass High level output voltage Silver, Brass Output voltage (See pin description) Strobe IRED IOH IOZ High-level output current, I/O Output off-state leak current, LED figure) Strobe on, IRED off (See sample figure) 12 -- 9.0 9.0 9.0 9.0 9.0 9.0 2.0 mA 1.5 2.7 7.0 V 3.2 6.3 8.5 V VIN = VSS or VDD VIN = VSS or VDD VIN = VSS or VDD 12 12 12 ±100 ±100 ±100 VIN = VSS 12 -1 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 IOUT = -16mA 6.5 5.5 - VDD-0.1 9.0 VDD-4.4 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 0.5 25 -- nA uA 10 100 140 uA 0.6 1.0 V - V Vdd-5.6 V 9.0 2.25 0. 1 3.75 6.5 -4 -mA 12 -- -16 12 - ±1 uA 5 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet Local smoke, Pushbutton test or VIC -VDD -4 VDD -2 V chamber sensitivity test Local smoke, Internal reference voltage pushbutton test or VREF -- VDD-3.08 VDD-3.92 V of smoke comparator chamber sensitivity test 7.3 AC Electrical characteristics(Ta = 25 ℃ , VSS as reference, unless otherwise indicated, Vdd=9V,R1=100k Vdd=9V,R1=100kΩ ,R1=100kΩ，C3=1500pF， C3=1500pF，R2=10MΩ R2=10MΩ) Common-mode voltage range C1, C2, Detect No Symbol Parameter Conditions 1 1/fosc OSC Period* Free-Running Sawtooth Measured at Pin12 2 Tled 3 Tled 4 Tled 5 Tled Clock No Local and Remote Smoke Led Pulse Period Remote Smoke, But no Local Smoke Only Typ Max. Unit 1 7.0 7.9 8.6 ms 4096 28.8 32.4 35.2 s - Extinguished s Local Smoke 64 0.45 0.5 0.55 s Pushbutton Test 64 0.45 0.5 0.55 s 1 7.0 8.6 ms Smoke Test 1024 7.2 8.1 8.8 s Chamber sensitivity Test without Local Smoke 4096 28.8 32.4 35.2 s 128 0.9 1 Led and strobe Pulse Width 6 Tw(led,stb)) 7 Tired 8 Tired 9 Tired 10 Tw(ired) Ired Pulse Width 11 Tr(ired) Ired Rise Time - 12 Tf(ired) Ired Fall Time - 13 Ton 14 Toff 15 Toffd Sliver and Brass Temporal Modulation Polse Width 16 Tch Sliver and Brass Chirp Pulse Period 17 Tw(ch) Sliver and Brass Chirp Pulse Width 18 Trr Rising Edge on I/O to smoke Alarm Response Time Ired Pulse Period Min. Pushbutton Test 1.1 s 116 us - 30 us - 200 us 0.5 0.55 s Tf* Low Supply or Degraded Chamber Sensitivity Remote Smoke, no Local Smoke - 94 64 0.45 64 0.45 0.5 0.55 s 192 1.35 1.52 1.65 s 4096 28.8 32.4 35.2 s 1 7.0 7.9 8.6 ms - - 2 - ms 19 Smoke Test 1024 7.2 8.1 8.8 s 20 Chamber sensitivity Test without Local Smoke 4096 28.8 32.4 35.2 s 21 Low Supply Test without Local Smoke 4096 28.8 32.4 35.2 s 22 Pushbutton Test Tstb Strobe Out Pulse Period - - 1 - s 6 / 10 Shanghai Belling Co., Ltd. BL59A12/BL59S12 Datasheet OSC Period T（=Tr+Tf）is determined by the external R1 ,R2,and C3,where Tr=(0.6931)R2*C3 and Tf=(0.6931)R1*C3 8. Application Application sample figure VDD D1 47uF 47n C1 R14 C2 4.7n 1 6.8K 4.7K R11 2 250K R10* D2 3 IR Detector 4 R12 VDD VDD 9V TEST R9* 5k BT1 D3 A 1k C5 VDD IR Emitter R13* 100uF 4.7to22 Q1 5 6 7 8 3 2 1 C1 Test C2 LowSupplyTrip Detect Vss Strobe R1 Vdd Osc IRED LED Ｉ／Ｏ Brass Freedback SILVER 100K C4 R7 47K 6.8k VDD R8* R6 16 15 13 12 11 10 VDD R2 14 7.5M R1 C3 100K R3 470 1500pf D4 A 100K 9 Visible LED U2 R4* C6 0.01uf R5* 2.2M BUZZER com 7 / 10 BL59A12/BL59S12 Datasheet Shanghai Belling Co., Ltd. 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. Low15 Low-supply High: High supervisory gain on pin2. When pin15=low, driving it high enables gain with a hysteresis in Feedback 10 the photo amp. OSC 12 It equals to internal clock. This pin becomes smoke comparator’s output. Positive pulses indicate that smoke has been detected. A static low level indicates Silver 9 no smoke. This pin becomes the smoke integrator’s output. Static high level Brass 8 means two consecutive smoke detections. Static low level means two no-detections. 8 / 10 BL59A12/BL59S12 Datasheet Shanghai Belling Co., Ltd. PACKAGE DIP16 9 / 10 BL59A12/BL59S12 Datasheet Shanghai Belling Co., Ltd. SOP16 10 / 10