BL59A65 Shanghai Belling Co., Ltd. Photo Smoke Detector Control IC with hush BL59A65 DATASHEET Introduction: The BL59A65 is a low-current BiCMOS circuit providing all of the features for a photoelectric type smoke detector. BL59A65 can be used in conjunction with an infrared photoelectric chamber to sense scattered light from smoke particles. Special features are incorporated in the design to facilitate calibration and testing of the finished detector. Features: 6 V to 12 V Operating Voltage Range Supply Voltage current：less than 10uA Internal Timer & Control for Reduced Sensitivity Operating Temperature Range：－25～75℃ Power-ON Reset ESD and Latch-up Protection Piezoelectric Horn Driver Interconnect Up to 50 Detectors Continuous Modulated Tone Output For a Local or Remote Alarm Condition Package Type: DIP16; SOP16 Page 1 of 11 BL59A65 Pin Configuration: Fig.1 Pin Configuration MAXIMUM RATINGS (Voltage referenced to Vss) Symbol Parameter Range Unit ＶDD Supply Voltage -0.5～＋15 V ＶIN Input Voltage -0.3～ＶDD＋0.3 V IIN Input Current 10 mA TA Operating Temperature -25 ～ +75 ℃ Ｔstg Storage Temperature -55 ～ +125 ℃ ＴL Welding Temperature 260 ℃ PIN FUNCTIONAL DESCRIPTION Pin Pin symbol No. 1 ,2 Input/O Function Description utput C1 , C2 External capacitor connected to the pins 3 DETECT Input Input to the photo amplifier 4 STROBE Output Regulated voltage Output 5 ,14 Vdd , VSS 6 IRED Power/Gnd Output Signal output A capacitor connected to the pins determines the gain of the photo amplifier. This pin connects the cathode of the photo diode. The photo diode is operated at zero bias. The pin is the Regulated voltage Output. The value is Vdd-5V. Power supply This pin is a output, which provides a pulsed base current for the external npn transistor, which drives the IR emitter. 7 I/O A connection at this pin allows multiple smoke detectors (less than 50) to be interconnected. 8 ,9 BRASS, Output SILVER 10 FEEDBACK Piezoelectric Transducer Output Inuput Piezoelectric Transducer Input 11 LED Page 2 of 11 Output Signal output These TWO pins are used in conjunction with a piezoelectric transducer. The pin is used in conjunction with a piezoelectric transducer feedback electrode. This open-drain NMOS output is used to directly drive a BL59A65 visible LED. The LED also indicates detector status as follows (with component values as in the typical application, all times nominal) 12 OSC Input OSC Input The pin connects with external capacitor and resistor, sets the internal clock low time. 13 R1 External capacitor and resistor connected to the pins 15 LS SET Intput Low sensitive set The pin connects with external capacitor and resistor, sets the internal clock high time, which is also IRED pulse width. This input pin serves two purposes in normal operation: serves as an enable for the internal 10-minutes (nominal) timer and also as the reference (set by external resistor divider between VDD and STROBE) for the smoke comparator during the timer mode. This allows the detector to have a different sensitivity set point during the timer mode. If the timer mode is not used, this pin can be left open or connected to Vss, which disables this mode. 16 TEST Input Test Input This pin has an internal pull-down device and is used to manually invoke Test Mode and Timer Mode. High logic level on this pin initiates Push-to-Test Mode (Av = 1 + (C1/10) where C1 is in pF.). When push-button is released, the input returns to Vss due to the pull down. This high-to-low transition on the pin also resets and starts the 10 minutes hush timer (Timer Mode). FUNCTIONAL BLOCK DIAGRAM Fig.2 Functional Block Diagram Page 3 of 11 BL59A65 Circuit Characteristic The gain is determined by external capacitor C1 and C2. A capacitor connected to C2 determines the gain of the photo amplifier during standby. A typical value for this low-gain mode is 4700 pF but should be selected based on a specific photo chamber and the desired level of sensitivity to smoke. AV= 1+(C2/10) where C2 is in pF. This gain increases by a nominal 10% after a local alarm is detected (three consecutive detections). I/O pin allows multiple smoke detectors to be interconnected. If a local smoke condition occurs, this pin is driven high. As an input, this pin is sampled nominally every 1.35 seconds during standby. Any local alarm condition causes I/O to be ignored as an input. An internal nmos device acts as a charge dump to aid in applications involving a large (distributed) capacitance. The charge dump is activated at the end of local or test mode. LED pin is an output pin, which is used to directly drive a visible LED. The load for the low-battery test is applied to this output. The low-battery test does not occur coincident with any other test or alarm signal. The LED also indicates detector status as follows (with component values as in the typical application, all times nominal): Standby - Pulses every 43 seconds. Local Smoke - Pulses every 0.67 second. Remote Alarm - No pulses. Test Mode - Pulses every 0.67 second. Timer Mode - Pulses every 10 seconds Page 4 of 11 BL59A65 Timing Diagram Standby Timing Diagram Local Alarm Timing Diagram Page 5 of 11 BL59A65 DC ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss. TA = 25 ℃) Symbol Parameter Conditions VDD Pin Min. Max. Unit VDD Supply Voltage Range - - 6.0 12 V VTH Low VDD(th) threshold - - 6.9 7.6 V IDD Operating Supply Current Standby 12 5 - 10 uA iDD Operating Supply Current Strobe on IRED off 12 5 - 2.0 mA I/O 9.0 7 - 1.5 Feedback 9.0 10 - 2.7 Test 9.0 16 - 7.0 LS SET 9.0 15 - 0.5 I/O 9.0 7 3.2 Feedback 9.0 19 6.3 Test 9.0 16 8.5 LS SET 9.0 15 1.6 12 1,2 12 Low-Level Input Voltage VIL V High-Level Input Voltage VIH - V - 100 nA 3,10,12 - 100 12 1,2,3 - -100 nA Input Leakage High IIH C1，C2 Detect, Feedback, OSC Vin=VDD，Strobe active Pin 12=Vdd Vin=VDD Input Leakage Low IIL C1, C2, Detect Vin=VST，Strobe active, Pin 12=Vdd Feedback, OSC Vin=VSS 12 10,12 - -100 nA LS SET, TEST Vin=VSS 12 15,16 - -1.0 uA Test, LS SET Vin=VDD 9.0 15,16 0.25 10 I/O No Local Alarm， Vin=VDD 9 7 20 80 I/O No Local Alarm， Vin=17V 12 7 - 160 LED Io=10mA 6.5 11 - 0.6 BRASS,SILVER Io=16mA 6.5 8,9 - 1.0 R1 Io=5mA 6.5 13 - 0.5(typ) Io=-16mA 6.5 8,9 5.5 - Inactive, Iout=-1uA 12 4 VDD-0.1 - Input Pull-Down Current IIN uA Low-Level Output Voltage VOL VOH V High-Level Output Voltage BRASS, SILVER V Strobe Output Voltage VST Strobe Page 6 of 11 V BL59A65 VDD-5. Vdd-4.7 25 5 active, I out=100uA to 500uA 9.0 4 Inactive, Io=1uA, TA=25°C 12 6 active, Io=6mA, TA=25°C 9 6 2.85 3.35 9.0 7 -4 - mA Vout=VDD 12 11,13 - 1 uA Vout=Vss 12 11,13 - -1 uA － 1,2,3 VDD-4 VDD-2 V － internal VDD-3.7 VDD-3.3 V Ired Output Voltage Vired IOH IOZ IOZ VIC High-Level Output Current Any Alarm Condition I/O , Vo=VDD-2V OFF Leakage Current High LED,R1 OFF Leakage Current Low LED,R1 Common Mode Voltage C1，C2，Detect Smoke Comparator Ref. Vref Any Alarm Condition Volt. Any Alarm Condition 0.1 V AC ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss. TA = 25 ℃) Symbol Parameter Tosc OSC Period VDD Pin clocks Min. Typ. Max. Unit 9 12 1 9.4 10.5 11.5 ms No Local or Remote Smoke 9 11 4096 39 - 48 s Remote Smoke Only 9 11 None - - - Tled3 Local Smoke or Test 9 11 64 0.60 0.67 0.74 s Tled4 Timer Mode, No Alarm 9 11 1024 9.67 10.75 11.83 s 9 11 1 9.5 - 11.5 ms Tled1 Tled2 Conditions Led Pulse Period Tw(led) Led Pulse Width Tst1 No Local or Remote Smoke 9 4 1024 9.6 - 11.9 s Tst2 After 1 of 3 Vaild Samples 9 4 256 2.42 2.70 2.96 s 9 4 128 1.21 1.34 1.47 s 9 4 1024 9.67 10.8 11.8 s 9 4 4096 38.9 - 47.1 s 9 4 32 330 336 370 ms 9 4 1 9.5 11.5 ms After 2 of 3 Vaild Samples Tst3 and During Local Alarm Strobe Pulse Period Tst4 Remote Alarm Chamber Test or Low Tst5 Supply Test,No Local Alarm Tst6 Tw(st) Pushbutton Test,No Alarm Strobe Pulse Width Tired1 No Local or Remote Smoke 9 6 1024 9.6 - 11.9 s Tired2 After 1 of 3 Vaild Samples 9 6 256 2.42 2.70 2.96 s 9 6 128 1.21 1.34 1.47 s 9 6 1024 9.67 10.8 11.8 s 9 6 4096 38.9 - 47.1 s 9 6 32 330 336 370 ms 9 6 116 us After 2 of 3 Vaild Samples Tired3 and During Local Alarm Ired Pulse Period Tired4 Remote Alarm Chamber Test or Low Tired5 Supply Test,No Local Alarm Tired6 Tw(ired) Pushbutton Test,No Alarm Ired Pulse Width Page 7 of 11 94 BL59A65 Tr(ired) Ired Rise Time 10%to 90% 6 - - 30 us Tf(ired) Ired Fall Time 90% to 10% 6 - - 200 us Td(io) I/O to Active Delay Local Alarm 9 7 - 0 Tdump I/O Charge Dump Duration End of Local Alarm or Test 9 7 1.21 1.35 1.45 s Tr(io) Rising Edge on I/O to Alarm No Local Alarm 9 7 - - 1.34 s Thorn Horn warning Pulse Period 9 8,9 4096 38.9 - 47.1 s 9 8,9 1 9.5 11.5 ms 128 s Local Supply and Degraded Chamber Sensitivity Tw(horn Local Supply and Degraded Horn warning Pulse Width ) Chamber Sensitivity Ton(hor Horn on time Local or Remote Alarm 9 8,9 24 252 ms Horn off Time Local or Remote Alarm 9 8,9 8 84 ms n) Toff(hor n) Vpin15 >1.6V and Vpin16 jumps THUSH Silence Time 61440± 9 from Vdd to float 9.30 10.75 12.17 min 2048 Note: TOSC is determined by the external R1, R2 and R3. TOSC = Tr + Tf, Tr = R2*C3*(ln2) = 0.6931*R2*C3; Tf = R1*C3*(ln2) = 0.6931*R1*C3. Page 8 of 11 TYPICAL APPLICATION Fig.3 Typical Application Calibration Mode Description For sensitive detecting and calibrating smoke system, BL59A65 could set calibration Mode. If TEST=VSS-0.9V, and draining 100uA current from the pin. After one period, BL59A65 is in calibration Mode。To exit this mode, TEST pin is floated for at least one OSC cycle. PIN Symbol 7:I/O Function This pin is disabled as an output. A logic high on this pin places the photo amplifier output on pin 1 or pin 2 as determined by pin 15. The amplifier output appears as pulses. 15:LS SET If the I/O pin is high, this pin controls the amplifier gain capacitor. If pin 15 is low, normal gain is selected and the amplifier output is on pin 1. If pin 15 is high, supervisory gain is selected and the amplifier output is on pin 2. 10:FEEDBAC If pin 7 is high and pin 15 is low (normal gain), taking this pin to a high K logic level increases the amplifier gain by ~10% (hysteresis). 12:OSC This pin may be driven by an external clock source. 8:BRASS This pin is reconfigured as the smoke integrator output. Three consecutive smoke detections will cause this pin to go high and three consecutive no smoke detections cause this pin to go low. 11:LED This pin becomes a low-battery indicator. The open-drain NMOS output is normally OFF. If VDD falls below the low battery threshold, the output turns on. PACKAGE DIP16 SOP16