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BL59A65 page 1 of 11 shanghai belling co., ltd. photo smoke detector control ic with hush BL59A65 datasheet introduction: the BL59A65 is a low-current bicmos circuit providi ng all of the features for a photoelectric type smoke detector. BL59A65 ca n be used in conjunction with an infrared photoelectric chamber to sense sca ttered 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 re mote alarm condition package type: dip16; sop16
BL59A65 page 2 of 11 pin configuration: fig.1 pin configuration maximum ratings ( voltage referenced to vss ) symbol parameter range unit dd supply voltage -0.5 15 v in input voltage -0.3 dd 0.3 v iin input current 10 ma t a operating temperature -25 +75 stg storage temperature -55 +125 l welding temperature 260 pin functional description pin no. pin symbol input/o utput function description 1 ,2 c1 , c2 external capacitor connected to the pins a capacitor connected to the pins determines the gai n of the photo amplifier. 3 detect input input to the photo amplifier this pin connects the cathode of the photo diode. t he photo diode is operated at zero bias. 4 strobe output regulated voltage output the pin is the regulated voltage output. the value is vdd-5v. 5 ,14 vdd , v ss power/gnd power supply 6 ired output signal output this pin is a output, which provides a pulsed base current for the external npn transistor, which driv es the ir emitter. 7 i/o a connection at this pin allows multiple smo ke detectors (less than 50) to be interconnected. 8 ,9 brass, silver output piezoelectric transducer output these two pins are used in conjunction with a piezoelectric transducer. 10 feedback inuput piezoelectric transducer input the pin is used in conjunction with a piezoelectric transducer feedback electrode. 11 led output signal output this open-drain nmos output is used to directly drive a
BL59A65 page 3 of 11 visible led. the led also indicates detector status a s 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 the pin connects with external capacitor and resist or, sets the internal clock high time, which is also ir ed pulse width. 15 ls set intput low sensitive set this input pin serv es 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. thi s allows the detector to have a different sensitivity set point during the timer mode. if the timer mode is n ot 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 pu ll-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 d own. 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
BL59A65 page 4 of 11 circuit characteristic the gain is determined by external capacitor c1 and c2. a capacitor connected to c2 determines the gain of the photo am plifier 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 s ensitivity 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 detectio ns). i/o pin allows multiple smoke detectors to be inter connected. if a local smoke condition occurs, this pin is driven high. as an in put, this pin is sampled nominally every 1.35 seconds during standby. any lo cal alarm condition causes i/o to be ignored as an input. an internal n mos device acts as a charge dump to aid in applications involving a large (dist ributed) capacitance. the charge dump is activated at the end of local or tes t 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 signa l. the led also indicates detector status as follows (with component values a s 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
BL59A65 page 5 of 11 timing diagram standby timing diagram local alarm timing diagram
BL59A65 page 6 of 11 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 vil low-level input voltage v 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 vih high-level input voltage - v 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 iih input leakage high na c1 c2 vin=vdd strobe active pin 12=vdd 12 1,2 - 100 detect, feedback, osc vin=vdd 12 3,10,12 - 100 iil input leakage low c1, c2, detect vin=vst strobe active, pin 12=vdd 12 1,2,3 - -100 na feedback, osc vin=vss 12 10,12 - -100 na ls set, test vin=vss 12 15,16 - -1.0 ua iin input pull-down current 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 vol low-level output voltage v 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) voh high-level output voltage brass, silver io=-16ma 6.5 8,9 5.5 - v vst strobe output voltage v strobe inactive, iout=-1ua 12 4 vdd-0.1 -
BL59A65 page 7 of 11 active, i out=100ua to 50 0ua 9.0 4 vdd-5. 25 vdd-4.7 5 vired ired output voltage v inactive, io=1ua, ta=25 c 12 6 0.1 active, io=6ma, ta=25 c 9 6 2.85 3.35 ioh high-level output current i/o any alarm condition , vo=vdd-2v 9.0 7 -4 - ma ioz off leakage current high led,r1 vout=vdd 12 11,13 - 1 ua ioz off leakage current low led,r1 vout=vss 12 11,13 - -1 ua vic common mode voltage c1 c2 detect any alarm condition 1,2,3 vdd-4 vdd-2 v vref smoke comparator ref. volt. any alarm condition internal vdd-3.7 vdd-3.3 v ac electrical characteristics ( voltages referenced to vss. ta = 25 ) symbol parameter conditions vdd pin clocks min. typ. max. unit tosc osc period 9 12 1 9.4 10.5 11.5 ms tled1 led pulse period no local or remote smoke 9 11 4096 39 - 48 s tled2 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 tw(led) led pulse width 9 11 1 9.5 - 11.5 ms tst1 strobe pulse period 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 tst3 after 2 of 3 vaild samples and during local alarm 9 4 128 1.21 1.34 1.47 s tst4 remote alarm 9 4 1024 9.67 10.8 11.8 s tst5 chamber test or low supply test,no local alarm 9 4 4096 38.9 - 47.1 s tst6 pushbutton test,no alarm 9 4 32 330 336 370 ms tw(st) strobe pulse width 9 4 1 9.5 11.5 ms tired1 ired pulse period 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 tired3 after 2 of 3 vaild samples and during local alarm 9 6 128 1.21 1.34 1.47 s tired4 remote alarm 9 6 1024 9.67 10.8 11.8 s tired5 chamber test or low supply test,no local alarm 9 6 4096 38.9 - 47.1 s tired6 pushbutton test,no alarm 9 6 32 330 336 370 ms tw(ired) ired pulse width 9 6 94 116 us
BL59A65 page 8 of 11 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 s tdump i/o charge dump duration end of local alarm or test 9 7 12 8 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 local supply and degraded chamber sensitivity 9 8,9 4096 38.9 - 47.1 s tw(horn ) horn warning pulse width local supply and degraded chamber sensitivity 9 8,9 1 9.5 11.5 ms ton(hor n) horn on time local or remote alarm 9 8,9 24 252 ms toff(hor n) horn off time local or remote alarm 9 8,9 8 84 ms t hush silence time v pin15 >1.6v and v pin16 jumps from vdd to float 9 61440 2048 9.30 10.75 12.17 min note: t osc is determined by the external r1, r2 and r3. t osc = tr + tf, tr = r2*c3*(ln2) = 0.6931*r2*c3; tf = r1*c3*(ln2) = 0.69 31*r1*c3.
typical application fig.3 typical application calibration mode description for sensitive detecting and calibrating smoke syste m, BL59A65 could set calibration mode. if test=v ss -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 function 7:i/o 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 o utput is on pin 1. if pin 15 is high, supervisory gain is selected and the am plifier output is on pin 2. 10:feedbac k if pin 7 is high and pin 15 is low (normal gain), t aking this pin to a high logic level increases the amplifier gain by ~10% (h ysteresis). 12:osc this pin may be driven by an external clock source. 8:brass this pin is reconfigured as the smoke integ rator output. three consecutive smoke detections will cause this pin to go high and three consecutive no smoke detections cause this pin to g o low. 11:led this pin becomes a low-battery indicator. th e open-drain nmos output is normally off. if vdd falls below the low battery threshold, the output
turns on. package dip16
sop16

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