LS521 SITI | Alldatasheet
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Version : A.002 Issue Date : 2015/07/10 File Name : SP-LS521-A.002.doc Total Pages : 12 ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE 新竹市科學園區展業一路9號7樓之1 SILICON TOUCH TECHNOLOGY INC. 9-7F-1, Prosperity Road I, Science Based In dustrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page1 ILLUMINATION-TO-DIGITAL CONVERTERS GENERAL DESCRIPTION The LS521 is a low-noise, high-sensitivity and illumination-to-digital converter with two-wire SMBus serial interface. The device integrates a photodiode, a trans -impedance amplifier, and 8-bits analog-to-digital converter (ADC) in a single IC to provide illumination information over an effective 8 -bit dynamic range. The digital output is directly proportional to ambient illumination. The LS521 is characterized with the C.I.E. response as the human eye’s visual response, which peaks at 555nm. Illumination information can be used to control display panel backlighting with the purpose of extending battery life and providing optimum viewing in diverse lighting conditions. Also, illumination information can further be used to manage exposure control i n digital cameras and camcorders. The LS521 device is ideal in notebook/tablet PCs, flat -panel televisions, cellular phones, LCD monitors, digital cameras, camcorder, and street/room lighting control, etc.
FEATURES
- Characterized with the C.I.E. re sponse as the human eye’s response 2. 8 -bit linear digital output for ambient illumination with two wire SMBus interface. 3. Tunable illumination sensitivity by an external resistor 4. Rejection of 50Hz/60Hz lig ht ripple by an external resistor (RL) and an external capacitor (CL) 5. Wide power supply range (2.7~5.5V) 6. Low power dissipation in shut -down mode. 7. Tiny SMD type package: Width: 3.0mm/Height: 3.0 mm/Depth: 1.1mm Width: 2.0mm/Height: 2.0 mm/Depth: 0.63mm 8. High sensing illuminance range (0~14000 lux).
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page2 FUNCTIONAL BLOCK DIAGRAM and APPLICATION ABSOLUTE MAXIMUM RATINGS Item Symbol Ratings Unit Supply V oltage VDD -0.4 ~ 6 V Input V oltage for SCLK, SDA, REXT VIN -0.4 ~ VDD+0.4 mA Input Current for SCLK, SDA IIN +20 mA Output Current for SDA IOUT -1 mA Operating Temperature Topr -25 to +85 ℃ Storage Temperature Tstg -40 to +125 ℃ Electrostatic Damage, (HBM) ESD 3 kV RECOMMENDED OPERATING CONDITIONS Item Symbol Min. Typ. Max. Unit Supply Voltage VDD 2.7 5.5 V Operating Temperature Topr -25 85 ℃ Input Low V oltage for SCLK, SDA VIL 0.8 V Input High V oltage for SCLK, SDA VIH 2.1 VDD V Operating Frequency for SCLK fSCLK 10 400 KHz A/D converter Oscillator SMBus Interface Control Logic ADC Register Command Register VDD VSS SCL K SDA REXT 0.1uF RL CL
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page3 ELECTRICAL CHARACTERISTICS (VDD=3V , TA=25℃ if not mentioned ) Item Symbol Test Conditions Min. Typ. Max. Unit SMBus Output Low V oltage VOL IO =10uA - 0.01 - V IO =350uA - - 0.4 V Supply Current IDD Power-up, VSMBCLK =VSMBDA T=VDD, Ee =0, VDD =3V - 0.38 0.43 mA VDD =5.5V - 0.65 0.75 Power-down, VSMBCLK=VSMBDA T = VDD, Ee =0 VDD =3V - 30 35 uA VDD =5.5V - 80 92 Shut-down ADC, VSMBCLK=VSMBDA T =VDD, Ee =0 VDD =3V - 0.33 0.38 mA VDD =5.5V - 0.6 0.7 High Level Input Current IIH VSDA(or VSCL)=VDD - - 5 uA Low Level Input Current IIL VSDA(or VSCL)= 0V - - -5 uA DC OPERATING CHARACTERISTICS (VDD=3V , TA=25℃, RL=11.9kΩ, CL=100uF, unless otherwise noted) Item Symbol Test Conditions Min. Typ. Max. Unit Full scale ADC count - - - - 255 counts ADC count value DOUT Ee =0 - 0 2 counts Ee =400 lux, Fluorescent light (note.1) 83 104 125 Illuminance responsivity Rv Fluorescent light (note.1) 0.208 0.26 0.312 counts/ lux NOTE: 1. Using a white LED as the fluorescent light source. MAXIMUM ILLUMINANCE RANGE SETTING
SILICON TOUCH TECHNOLOGY INC. Table 1. Maximum illuminance range vs RL Table 2. RL , CL setting
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page5 SMBUS TIMING DIAGRAM
SILICON TOUCH TECHNOLOGY INC. Figure 4. SMBUS packet protocol diagram element key
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page8 LIGHT TO DIGITAL@VDD=3V (fluorescent light) 120 160 200 240 280 0 2000 4000 6000 8000 10000 12000 14000 Ambient light(lux) Digital output(counts) RL=1.2KΩ RL=6KΩ Digital variation 2 3 4 5 6 VDD(volt) Digital output Ee=800lux(flourescent), R=1.2KΩ Temperature variation@VDD=3V -10 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature(℃) Digital output Ee=500lux(flourescent), R=1.2KΩ Ee=0lux, R=1.2KΩ Incident angle vs Responsivity@VDD=3V fluorescent light Ee=500lux 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Incident angle Digital output TOP view X Y IDD vs Temp.@Ee=0lux 0.0 0.5 1.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 Temperature(℃) IDD(mA) Spectral response 0.0 0.2 0.4 0.6 0.8 1.0 1.2 300 500 700 900 1100 wavelength(nm) relative responsivity LS521 CIE
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page9 PACKAGE DESCRIPTIONS IPLCC8 3mm x 3mm x 1.1mm PIN NO. PIN NAME DESCRIPTIONS
1 SCL Serial Clock IN
2 VDD Power
3 VSS Ground
6 SDA Serial Data I/O
8 Rext External Resistor
- Bottom View ● Top View
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page10 IPLCC6 2mm x 2mm x 0.63mm
點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. ILLUMINATION-TO-DIGITAL CONVERTER with SMBUS INTERFACE Version：A.002 Page11 REFLOW SOLDERING The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like . Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly a nd severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.