digital output ambient light sensor ( reference) description the KOE1023A is an ambient light sensor with i 2 c interface which converts light intensity into digital output in controllable time periods and gains. the KOE1023A incorporates photodiodes, low noise amplifiers, and adcs(analog to digital converter) in a single chip. the photo diode has the different spectrum response each other. adc has the 16 bit resolution from 0 to 65,535 for representing light intensity. features converters light intensity to digital data format 16 bits resolution of light intensity close to human eye response programmable interrupt function 50/60hz ripple rejection i 2 c protocol interface up to 400 khz (fast mode) package : cob 6pin, 2.2 x 2.0 x 0.7 mm3 applications mobile devices : smart phone, pda, and gps computing devices : notebook, umpc web pod, monitor consumer devices : lcd tv, digital picture frame, digital camera other devices : industrial and medical light sensing absolute maximum ratings [t a = 25 ] operating temperature *1. relfow soldering temp. 260 (max 10sec) v parameter symbol min. max. max. supply votage v dd - 3.8 -30 85 storage temperature tstg. -30 85 topr. peak reflow soldering temperature *1 tsol - 260 a uk corp. KOE1023A the contents of this data sheet are subject to change without advance notice for the purpose of improvement. when using this product, would you please refer to the latest specifications. lpf adc control logic lpf adc register i 2 c logic as in sc sd pd
( reference) recommended operating conditions [t a = 25 ] electrical & optical specifications [t a = 25 ] i 2 c timing characteristics [ta=25 ] i 2 c operating frequency f scl 10 v i 2 c input high voltage v ih v dd =3.0v 2.1 0.8 v v dd =3.0v 300 ? max. unit. 3.0 3.3 v i 2 c input low voltage v il ? clock / data fall time t (f) 300 ? ? i 2 c clock(scl) low period t (low) 1.3 ? t (sudat) 100 2.7 data setup time 0.9 ? parameter symbol conditions min. typ. supply voltage v dd data hold time t (hddat) 0 ? ? 400 ? after this period, the first clock is generated. repeated start condition setup time t (susta) 0.6 ? 400 ? bus free time between start and stop condition t (buf) 1.3 ? output current with load i sig parameter symbol min. typ. conversion time i 2 c clock(scl) high period t (high) 0.6 clock / data rise time t (r) x 15,970 illuminance responsivity stop condition setup time t (susto) 0.6 t (conv) 1.2 clock frequency f (scl) hold time after(repeated) start condition. 40,000 lux max. unit. 100 400 ? shutdown current i dd (sd) t (hdsta) 0.6 unit. peak sensitivity wavelength p 550 ? parameter symbol conditions min. typ. max. i 2 c signal input logic high v ih logic low v il 0 1886 v 0.3*vdd v 0.7*v dd adc count value ch0 fluorescent lamp v dd =3v,ev=1,000lux ch1 6 ? counts ch1 505 ch0 tungstenlamp (2856k,d=30cm) v dd =3v,ev=1,000lux gain scaling(relative to 1x) 16x 15 10,189 16 17 ch0 r v v dd =3.0v, fluorescent lamp 1.89 780 counts/ lux ch1 0.51 maximum detectable intensity v dd =3.0v, fluorescent lamp f osc 690 735 ? ? supply current i dd v dd =3.0v 100 200 600 ? oscillator no light , v dd =3v , v 1 (sd) KOE1023A
( reference) application circuit package outline dimensions (unit : mm) the contents of this data sheet are subject to change without advance notice for the purpose of improvement. when using this product, would you please refer to the latest specifications. KOE1023A
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