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412101 visible light detector preliminary datas h eet revision a this do cu me nt is the prop erty of semefab (scotland ) ltd and is furnish ed in con f idence and up on the con d ition that it is neither copied n o r rele ase d to a third party witho u t prior c o ns en t. page 1 of 11 des cript ion the 412 101 is a lo w co st visible light sen s o r , with a curre n t output whi c h i s dire ctly prop o r tional to the light level. it has a b u ilt in optical filter to provide a respon se whi c h i s clo s e t o the hum an eye, or ?ph o topic?. the output curre n t can be co nverted to a voltag e by co nne ctin g it in serie s with a resi st or. the dyna mic rang e is determi ned b y the external resi stor and power su ppl y (10k a n d 5v give s a rang e of 0 to over 250 lu x, but ca n b e up to 1000 l u x with a 1k resi sto r). the internal d a rk cu rrent can c ellatio n enabl es hi gh accuracy o v er the full temperature rang e, eve n at lo w li ght levels. feat ure s ? nea r hum an eye photopi c respon se ? high ir reje ction ? integrated optical filter ? curre n t outpu t highly linear vs light level ? tempe r atu r e stable ? integrated hi g h gain ph oto-curre n t amplifier ? dark-current can c ell a tion applications ? da wn/du s k sensi ng ? secu rity lighting ? display ba ckli ghting in lapt ops, mobil e p hone s, lcd tvs ? night-li ghts 1.0 basic application & test circuit figure 1 vdd 4121 01 the 412 101 i s su pplie d as prob ed wafers. failing die are m a rked with a black in k-d o t. vs s rs s pin descrip tion vdd ? positiv e terminal vss ? neg a ti v e terminal
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 2 of 11 2.0 absolute maxi mum ra ti ngs par a mete r r a t i n g u n i t s supply input voltage -0.3 to 10 v supply cu rre nt internally limited ma operating te mperature, t o -40c to + 8 5c c storage te m peratu r e, t s - 4 0c to + 1 00c c 3.0 electrical speci f i c a t i o n the followi ng param eters apply over th e operating te mperature ra nge ?4 0 o c to + 8 5 o c, and with rss=1 0 k-ohm s and v dd= 5v, as per figu re 1. pa r a m e t e r s ym b o l t e s t c o nd i t i o ns m i n t yp m a x u ni t s i n f r a r e d r e sp on se 90 0n m 1 5 % of p e a k m i ni m u m op er at i o nal v o l t a g e v dd - v ss 25 0 l u x , i s s= 2 5 0 u a 2 . 4 v 1 0 0 lu x , i s s= 10 0u a 1 . 7 2 v li gh t cu r r en t i ss 2 0 0 lu x 1 50 2 0 0 2 50 u a 10 0 l u x 7 5 1 0 0 12 5 u a 10 lu x 7 . 5 10 1 2 . 5 u a d a r k c u r r e n t i dd( da r k ) 0 l u x , ta = 2 5 o c <1 1 0 n a 0 l u x , ta = 8 5 o c 15 0 2 0 0 na g a i n li ne ar i t y - 1 0 1 0 % p e ak spe c t r al r e sp ons e 5 2 0 nm s e ns i t i v e a r e a 0. 0 5 4 mm 2 u s e a b l e l i g h t r ang e r ss & v d d d e p e n dan t 1 10 00 l u x note tha t w i th a lo w e r rs s resistance, the linear light res pons e range ca n be grea tly increas ed ? up to 100 0 l u x. see graph on page 4.
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 3 of 11 3.1 characteristic curves r e sp o n se v s w a v e l e n g t h 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 1 00% 30 0 400 500 600 70 0 800 900 1000 1100 w a v e l e ngt h ( n m ) rel a t i ve re sp o n s e (% ) ph o t o p i c 41 210 1 v s s v e r s u s lu x le v e l v dd = 5v , r s s = 10k o h m s 0 0. 5 1 1. 5 2 2. 5 3 0 5 0 100 15 0 200 250 300 350 400 lu x vs s ( v )
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 4 of 11 v ss ver s u s l u x l e vel v d d = 5 v , r s s = 1 k oh m s 0 0. 1 0. 2 0. 3 0. 4 0. 5 0. 6 0. 7 0. 8 0. 9 0 2 00 40 0 6 00 8 0 0 10 0 0 lux v ss ( v ) v s s v s t e m p er at u r e 0. 0 0. 1 0. 2 0. 3 0. 4 0. 5 0. 6 0 1 02 0 3 0 4 05 06 0 7 08 09 0 t e m p e r at ure (c ) vs s ( v o l ts ) 5 vo l t s & 5 l u x , r s s = 1 0 k 5 vo l t s & 5 0 l u x , r s s = 1 0 k
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 5 of 11 412101 d a r k leakag e vs tem p er at u r e 0 20 40 60 80 10 0 12 0 14 0 16 0 18 0 20 0 0 2 04 0 6 08 0 te m p ( c ) l eak ag e ( n a )
412101 visible light detector preliminary datasheet revision a this document is the property of seme fab (scotland) ltd. and is furnished in confidence and upon the condition that it is neither copied or released to a third party without prior consent. page 6 of 11 4.0 application examples refer to the circuit schematic diagrams appended below. automatic night light fig 2: this circuit show the 412101 in an automatic night light . the lamp current is switched by a sensitive gate scr. the igt (t yp) of the scr should be less than 10ua. when the light is above threshold, current flows between the vdd and vss pins of the asic which diverts current away from the gate of the scr. the light switching threshold can be adjusted by choosing different values for r2 and r3. led drivers fig 3 is a very simple low cost circuit using the 412101 to switch an led. as the light increases, current flows between the vdd and vs s pins of the asic which pulls down the base of tr1. in dark conditions r1 supplies curr ent to the base of tr1 to switch on the led. the base current of tr1 must be small compar ed to the photo current. this circuit should only be used when the current in the led is less than 10ma. the dc current gain (hfe) of tr1 should be > 400 to minimise the base current. the bc550c or equivalent is a suitable transistor for tr1. this circuit is not suitabl e for vdc < 4v because of the headroom required for the led and tr1. r1 should be adjusted by customers to obtain the switching threshold to suit the application. this circuit does not have a sharp switching threshold. the led brightness decreases over a range of about 30 lux as the ambient light level increases towards the cut-off point. the led current will sw itch off completely when r1 is pulled down below about 2.5v. the advantage of this circuit is that it has the smallest number of components. fig4 is a general purpose led driver. the led sw itches on when the light is less than the switching threshold (slux). the base current of tr1 will affect the switching threshold. to minimise this effect the base current into tr 1 should be less than 10ua under all conditions of temperature and supply voltage. when the ambient light >slux tr1 pulls down r3 and switches off tr2. for battery operated applic ations low current drain is important and the value of r3 should be as high as possible so that when the led is off the circuit quiescent current is low. slux is controlled by r1 and t he base emitter voltage of tr1. r2 limits the base current into tr1 to prevent excess current with high illuminat ion. r4 controls the led current . fig5 . in this circuit the led switches on wh en the light is above the switching threshold slux. the value of r3 in this circuit can be lower than that in 3b because the current in tr1 is switched off in low light conditions . relay drivers fig 6 . the relay coil is energised when the light < sl ux. the slux threshold is set by r1 in the same way as explained in the description for ci rcuit 3c. for battery operated circuits, the hfe of tr2 should be high to allow a high value for r3. the hfe of tr1 should be high so that a low base current will be able to pull r3 down. example : vdc = 6v, relay coil resistance = 100r. min hfe of tr2 = 100, min hfe of tr1 = 200
412101 visible light detector preliminary datasheet revision a this document is the property of seme fab (scotland) ltd. and is furnished in confidence and upon the condition that it is neither copied or released to a third party without prior consent. page 7 of 11 coil current = 56ma. min base current to switch on tr2 = 0.56ma. so r3 = 10k. min base current of tr1 = 0. 56ma/200 = 2.8ua. with the above value for r3, the quiescent current when the relay is off would be around 0.6ma which might be too high for some battery operated circuits. fig 7 . the relay coil is energised when light > slux. in this case the quiescent current is low in dark conditions because tr1 is switched off at the same time as tr2 and the relay coil. the customer can control the cu rrent to the application and the quiescent current by choosing a normally open (no) or normally closed (nc) relay. interface circuit examples fig 8 shows an interface to a microprocessor. the voltage across r1 varies linearly with the illumination of the sensor. the current betw een the vdd and vss pins is approximately 1ua/lux, so with a 10k resistor the voltage at the a/d input will be 10mv per lux. the 412101 was designed for low lux applications and the headroom required between vdd and vss becomes a problem at higher lux levels. these parts are not ideally suited to control room lighting applications especially if the microproc essor supply voltage is low. for higher lighting applications such as the control of room ambient lighting or backlighting applications for tvs, computers or mobile phones a lower gain version is planned. fig 9. this circuit uses a transistor to provide a light level switching interface between the 412101 and cmos logic. the switching threshol d is set by r1 and the base of tr1 as explained for previous circuit examples. the out signal will be high when the illumination is above the threshold and low when it is below the threshold. using a buffer instead of an inverter will change the polarity of the out signal fig 10 . this circuit uses a comparator (or op-amp) to provide a level switching interface for the 412101. out will be high when t he voltage at vss < 0.1*vdd. fig 11 . same as fig 10 except that out will be high when the voltage vss > 0.1*vdd fig 12. the op-amp circuit amplifies the output voltage at vss. vout = (1 + r3/r2) iphoto*r1
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 8 of 11 figure 2 4 1 2 1 0 1 412101 412101 412101 fi g ure 4 fi g ure 3
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 9 of 11 412101 figure 5 412101 figure 6 412101 figure 7
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 10 of 11 412101 figure 8 412101 figure 9 412101 figure 10
412101 visible light detector preliminary datas h eet revis i on a this do cu me nt is the prop erty of seme fab (scotland ) ltd. and is furnished in confid en ce a nd upo n the condition that i t is neither co pied or rele ased to a third party without prio r co nsent. page 11 of 11 412101 figure 11 412101 figure 12

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