TSL220 LIGHT-TO-FREQUENCY CONVERTER

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1 TSL0 SOES00 AUGUST 0 REVISED JUNE High-Resolution onversion of Light Intensity to Frequency Wide Dynamic Range... db Variable (and Single) Supply Range... V to V High Linearity...Typically Within % of FSR ( = 0 pf) High Sensitivity... an Detect hange of 0.0% of FSR MOS ompatible Output for Digital Processing Minimum External omponents Microprocessor ompatible description The TSL0 consists of a large-area photodiode and a current-to-frequency converter. The output voltage is a pulse train and its frequency is directly proportional to the light intensity (irradiance) on the photodiode. The output is MOS compatible and its frequency may be measured using pulse counting, period timing, or integration techniques. The TSL0 is ideal for light-sensing applications requiring wide dynamic range, high sensitivity, and high noise immunity. The output frequency range is determined by an external capacitor; hence, the desired output frequency is adjustable for a given light intensity at the input. The TSL0 is characterized for operation over the temperature range of to 0. mechanical data The photodiode and current-to-frequency converter are packaged in a clear plastic -pin dual-in-line package. The active chip area is typically, mm (0.00 in )., (0.), (0.) PIN N PIN PUT PIN V PIN PIN GND PIN PIN NU PIN NU L Location of Photodiode enter 0, (0.0) R NOM N No internal connection NU Not usable (leave unconnected), (0.0), (0.0) L 0, (0.0) 0, (0.0) TYP, (0.), (0.), ± 0, (0.0 ± 0.00), (0.0), (0.0) 0, (0.0) MIN TYP, (0.0), (0.) 0 Places, (0.) 0,0 (0.0) 0, (0.00) Seating Plane 0, (0.0) 0, (0.0), (0.), (0.) 0, (0.0) 0, (0.0), ± 0, (0,0 ± 0.00) ALL LINEAR DIMENSIONS ARE IN MILLIMETERS AND PARENTHETIALLY IN INHES Use of TTL logic families may require a 00-Ω pulldown resistor on the output. PRODUTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. opyright, Texas Instruments Incorporated POST OFFIE BOX 0 DALLAS, TEXAS

2 TSL0 SOES00 AUGUST 0 REVISED JUNE functional block diagram TSL0 Light Photodiode I/f urrent to Frequency onverter absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, V (see Note ) V Operating free-air temperature, T A to 0 Storage temperature range to Lead temperature, mm (/ inch) from case for seconds NOTE : All voltage values are with respect to GND (pin ). recommended operating conditions MIN NOM UNIT Supply voltage, V Output frequency, fo ( 0 pf) 0 khz Operating free-air temperature range, TA 0 electrical characteristics at V = V, T A = (see Figure ) PARAMETER TEST ONDITIONS MIN TYP UNIT VOM Peak output voltage RL = 0 kω V I Supply current = 0 pf, Ee = 0. ma operating characteristics at V = V, T A = (see Figure ) PARAMETER TEST ONDITIONS MIN TYP UNIT fo Output frequency Ee = µw/cm, λ = 0 nm, = 0 pf 0 0 khz Ee = 0, = 0 pf 0 0 Hz tw Output pulse duration = 0 pf µs tr Output pulse rise time = 0 pf 0 ns tf Output pulse fall time = 0 pf ns POST OFFIE BOX 0 DALLAS, TEXAS

3 TSL0 PARAMETER MEASUREMENT INFORMATION SOES00 AUGUST 0 REVISED JUNE TSL0 RL Output tr tw 0% 0% % tf VOM 0 TEST IRUIT PUT WAVEFORM NOTE: Output waveform is monitored on an oscilloscope with the following characteristics: Ri MΩ, i. pf. Figure. Switching Times TYPIAL HARATERISTIS t w Output Pulse Duration µs 0,000, PUT PUE DURATION EXTERNAL APAITOR VALUE = V TA = Peak Output voltage V VOM.... PEAK PUT VOLTAGE LOAD RESISTANE = V TA = p p 0 p n n 0 n µ µ 0 µ m External apacitor Value F Figure 0 M M 0 k k k 0 RL Load Resistance Ω Figure POST OFFIE BOX 0 DALLAS, TEXAS

4 TSL0 SOES00 AUGUST 0 REVISED JUNE TYPIAL HARATERISTIS Output Frequency khz f o = V λ = 0 nm TA = PUT FREQUENY IRRADIANE = pf = 0 pf = 0. µf Normalized Output Frequency NORMALIZED PUT FREQUENY LOAD RESISTANE = V = 0 pf TA = Ee Irradiance µw/cm Figure 0. M 0 k k k 0 RL Load Resistance Ω Figure PUT FREQUENY EXTERNAL APAITOR VALUE NORMALIZED PUT FREQUENY FREE-AIR TEMPERATURE Normalized Output Frequency = V TA = Normalized Output Frequency = V = 0 pf Ee = µw/cm Light Source: Tungsten Filament Lamp apacitance nf Figure TA Free-Air Temperature Figure POST OFFIE BOX 0 DALLAS, TEXAS

5 TSL0 TYPIAL HARATERISTIS SOES00 AUGUST 0 REVISED JUNE SUPPLY URRENT SUPPLY VOLTAGE SUPPLY URRENT FREE-AIR TEMPERATURE Supply urrent ma I Ee = 0 = 0 pf RL = MΩ TA = Normalized Supply urrent = V = 0 pf RL = MΩ Light Source: Tungsten Filament Lamp 0. Supply Voltage V TA Free-Air Temperature Figure Figure 0. PHOTODIODE SPETRAL RESPONSE TA = 0. Normalized Response λ ± Wavelength nm 00 0 Figure POST OFFIE BOX 0 DALLAS, TEXAS

6 TSL0 SOES00 AUGUST 0 REVISED JUNE APPLIATION INFORMATION J K LK Q TSL0 / SNH Figure. Light-to-Frequency onverter with Square-Wave Output Ambient Light TSL0 0 Ω kω N0 or Equivalent To Blanking Inputs () TIL 0,0,0,0, NOTE: Adjust to set maximum and minimum brightness levels. Figure. Automatic Display Dimming ircuit fo TSL0 ounter Latch Digital Output Reset Enable lock Delay Figure. Light-to-Digital onverter POST OFFIE BOX 0 DALLAS, TEXAS

7 TSL0 APPLIATION INFORMATION SOES00 AUGUST 0 REVISED JUNE V Over Range K NT MSD TIL0 V V V V NT TIL0 K NT TIL0 K NT TIL0 K NT TIL0 K D V fo TSL0 kω K V t o t K V Q t o t K NE 0 pf SN. µf Figure. Simple Digital Light Meter TSL0 Port or Interrupt Input µp Figure. Light Detector with Direct Microprocessor Interface POST OFFIE BOX 0 DALLAS, TEXAS

8 TSL0 SOES00 AUGUST 0 REVISED JUNE APPLIATION INFORMATION TSL0 J K LK Q SNH K SNH0 QA QB Q QD / SNH 0 Y A B Output To µp Range Select Inputs From µp NOTE: Adjust for useful frequency range. Figure. Light Detector with Microprocessor (Microcontroller) and Autoranging apability TSL0 N ounter SNH0 SNH00 fo N Binary ounter SNH Binary Output L F Prescale ounter Figure. Digital Light Integrator POST OFFIE BOX 0 DALLAS, TEXAS

9 TSL0 APPLIATION INFORMATION SOES00 AUGUST 0 REVISED JUNE TSL0 D N Prescale Reset V V V K NT K NT K TIL0 TIL0 TIL0 MSD t R t V 0.0 µf NE Exposure time =. R t t Start Figure. Digital Light Exposure Meter POST OFFIE BOX 0 DALLAS, TEXAS

10 IMPORTANT NOTIE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. ERTAIN APPLIATIONS USING SEMIONDUTOR PRODUTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ( RITIAL APPLIATIONS ). TI SEMIONDUTOR PRODUTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVIES OR SYSTEMS OR OTHER RITIAL APPLIATIONS. INLUSION OF TI PRODUTS IN SUH APPLIATIONS IS UNDERSTOOD TO BE FULLY AT THE USTOMER S RISK. In order to minimize risks associated with the customer s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI s publication of information regarding any third party s products or services does not constitute TI s approval, warranty or endorsement thereof. opyright, Texas Instruments Incorporated

TSL260, TSL261, TSL262 IR LIGHT-TO-VOLTAGE OPTICAL SENSORS

TSL260, TSL261, TSL262 IR LIGHT-TO-VOLTAGE OPTICAL SENSORS TSL0, TSL, TSL SOES00A DECEMBER 99 REVISED FEBRUARY 99 Integral Visible Light Cutoff Filter Monolithic Silicon IC Containing Photodiode, Operational Amplifier, and Feedback Components Converts Light Intensity