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BL59S12 Dataheets PDF



Part Number BL59S12
Manufacturers SHANGHAI BELLING
Logo SHANGHAI BELLING
Description (BL59A12 / BL59S12) PHOTOELECTRIC SMOKE DETECTOR IC
Datasheet BL59S12 DatasheetBL59S12 Datasheet (PDF)

www.DataSheet4U.com 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 .

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www.DataSheet4U.com 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 http://www.belling.com.cn -1- 8/28/2006 Wrote by 2006 Total 8 Pages 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. http://www.belling.com.cn -28/28/2006 Wrote by 2006 Total 8 Pages 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.


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