BH1780GLI-E2 ROHM

Ambient Light Sensor ICs Digital 16bit Serial Output Type Ambient Light Sensor IC No.11046ECT08 BH1780GLI Descriptions 2 BH1780GLI is a digital Ambient Light Sensor IC for I C bus interface. This IC is the most suitable to obtain the ambient light data for adjusting LCD and Keypad backlight power of Mobile phone. It is possible to detect wide range at High resolution. ( 1 - 65535 lx ). Features 2 1) I C bus Interface f/s mode support, Slave address :0101001 2) Spectral responsibility is approximately human eye response 3) Illuminance to Digital Converter 4) Wide range and High resolution. 1 65535 lx 5) Low Current by power down function 6) 50Hz / 60Hz Light noise reject-function 7) 1.8V Logic input interface 8) No need any external parts 9) Light source dependency is little. ( ex. Incandescent Lamp. Fluorescent Lamp. Halogen Lamp. White LED. Sun Light ) 10) Small measurement variation (+/- 20%) 11) The influence of infrared is very small. Applications Mobile phone, LCD TV, NOTE PC, Portable game machine, Digital camera, Digital video camera, PDA, LCD display Absolute Maximum Ratings Parameter Symbol Limits Units Supply Voltage Vmax 4.5 V Operating Temperature Topr -4085 Storage Temperature Tstg -40100 SDA Sink Current Imax 7 mA Power Dissipation Pd 120 mW 70mm 70mm 1.6mm glass epoxy board. Decreasing rate is 1.6mW/ for operating above Ta=25. Operating Conditions Ratings Parameter Symbol Units Min. Typ. Max. VCC Voltage Vcc 2.3 2.5 3.0 V www.rohm.com 2012.06 - Rev.C 1/12 2012 ROHM Co., Ltd. All rights reserved. Technical Note BH1780GLI Electrical Characteristics ( VCC = 2.5V, Ta = 25, unless otherwise noted ) Limits Parameter Symbol Units Conditions Min. Typ. Max. Supply Current Icc1 120 200 A Ev=100 lx Powerdown Current Icc2 0.7 2.5 A No Input Light Sensor out / Actual lx Measurement Accuracy S/A 0.8 1.0 1.2 Times Ev=1000 lx Dark ( 0 lx ) Sensor out S0 0 0 2 count Measurement Time tM 150 250 ms SCL SDA input H Voltage V 1.26 V IH SCL SDA input L Voltage V 0.54 V IL SCL SDA input H / L Current I -10 10 A i 2 I C SDA Output L Voltage V 0 0.4 V IOL=3 mA OL1 2 I C Rejected Spike pulse witdh t 100 ns SP SDA SCL Capacitance C 7 pF i 2 I C SCL Clock Frequency f 400 kHz SCL 2 I C Hold Time ( Repeated ) t 0.6 us HD STA START Condition 2 I C L Period of the SCL Clock t 1.3 us LOW 2 I C H Period of the SCL Clock t 0.6 us HIGH 2 I C Set up time for a Repeated t 0.6 us SU STA START Condition 2 I C Data Hold Time t 0 us HD DAT 2 I C Data Setup Time t 100 ns SU DAT 2 I C Set up Time for t 0.6 us SU STO STOP Condition 2 I C Bus Free Time between t 1.3 us BUF a STOP and START Condition 2 I C Data Valid Time t 0.9 us VD DAT 2 I C Data Valid Acknowledge Time t 0.9 us VD ACK White LED is used as optical source. www.rohm.com 2012.06 - Rev.C 2/12 2012 ROHM Co., Ltd. All rights reserved.