BH1780GLI

Ambient Light Sensor IC Series Digital 16bit Serial Output Type Ambient Light Sensor IC BH1780GLI No.09046EAT08 ● Descriptions 2 BH1780GLI is an 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 & Hs 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, Car navigation, PDA, LCD display ● Absolute Maximum Ratings Parameter Supply Voltage Operating Temperature Storage Temperature SDA Sink Current Power Dissipation Symbol Vmax Topr Tstg Imax Pd Limits 4.5 -40～85 -40～100 7 120※ Units V ℃ ℃ mA mW ※ 70mm × 70mm × 1.6mm glass epoxy board. Derating in done at 1.6mW/℃ for operating above Ta=25℃. ● Operating Conditions Parameter VCC Voltage Symbol Vcc Min. 2.3 Typ. 2.5 Max. 3.0 Units V www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/13 2009.11 - Rev.A BH1780GLI ● Electrical Characteristics ( VCC = 2.5V, Ta = 25℃, unless otherwise noted ) Parameter Supply Current Powerdown Current Measurement Accuracy Dark ( 0 lx ) Sensor out Measurement Time SCL SDA input 'H' Voltage SCL SDA input 'L' Voltage SCL SDA input 'H' / 'L' Current I2C SDA Output 'L' Voltage I2C Rejected Spike pulse witdh I2C Rejected Spike pulse witdh2 SDA SCL Capacitance I2C SCL Clock Frequency I2C SCL Clock Frequency2 I C Hold Time ( Repeated ) START Condition I2C Hold Time ( Repeated ) START Condition2 I2C 'L' Period of the SCL Clock I2C 'L' Period of the SCL Clock2 I2C 'H' Period of the SCL Clock I2C 'H' Period of the SCL Clock2 I C Set up time for a Repeated START Condition I2C Set up time for a Repeated START Condition2 I2C Data Hold Time I2C Data Hold Time2 I2C Data Setup Time I2C Data Setup Time2 I C Set up Time for STOP Condition I2C Set up Time for STOP Condition2 I2C Bus Free Time between a STOP and START Condition I2C Data Valid Time I2C Data Valid Acknowledge Time 2 2 2 Technical Note Symbol Icc1 Icc2 S/A S0 tM VIH VIL Ii VOL1 tSP tSP Ci fSCL fSCLH tHD;STA tHD;STA tLOW tLOW tHIGH tHIGH tSU;STA tSU;STA tHD;DAT tHD;DAT tSU;DAT tSU;DAT tSU;STO tSU;STO tBUF tVD;DAT tVD;ACK Min. － － 0.8 0 － 1.26 － -10 0 － 0 0.6 160 1.3 160 0.6 60 0.6 160 0 0 100 10 0.6 160 1.3 - Typ. 120 0.7 1.0 0 150 － － － － 100 20 7 － － － － － － － － － － － － － － － - Max. 200 2.5 1.2 2 250 － 0.54 10 0.4 400 3.4 － － － － － － － － 70 － － － － － 0.9 0.9 Units uA uA Times count ms V V uA V ns ns pF kHz MHz us ns us ns us ns us ns us ns ns ns us ns us us us Conditions Ev=100 lx ※ No Input Light Sensor out / Actual lx Ev=1000 lx ※ IOL=3 mA F/S mode Hs mode F/S mode Hs mode Cb=100pF F/S mode Hs mode F/S mode Hs mode F/S mode Hs mode F/S mode Hs mode F/S mode Hs mode Cb=100pF F/S mode Hs mode F/S mode Hs mode F/S mode F/S mode ※ White LED is used as optical source. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/13 2009.11 - Rev.A BH1780GLI ● Block Diagram VCC Technical Note AMP ADC Logic + I2C Interface SCL SDA PD OSC GND PD Photo diode with approximately human eye response. AMP Integration-OPAMP for converting from PD current to voltage. ADC AD converter for obtainment digital 16bit data. 2 Logic + I C Interface Ambient Light Calculation and I2C bus Interface. It is including below register. Data Register → This is for registration of Ambient Light Data. Initial Value is "0000_0000_0000_0000". OSC Internal Oscillator ( typ. 320kHz ). It is CLK for internal logic. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/13 2009.11 - Rev.A BH1780GLI ● Reference Data 1.2 Technical Note 64 56 100000 1 Measurement Result 0.8 Measurement Result 48 40 32 24 16 8 0 10000 Ratio 1000 0.6 100 0.4 0.2 10 0 400 0 500 600 700 800 900 1000 1100 8 16 24 32 40 48 56 64 1 1 10 100 1000 10000 100000 Illuminance [ lx ] Wavelength [ nm ] Fig.1 Spectral Response 1.2 1 1pin Fig.2 Illuminance – Measurement Result 1 1.2 1 0.8 10 Illuminance [ lx ] Fig.3 Illuminance – Measuremnet Result 2 8 蛍光灯白熱灯感度比 0.8 + Measurement Result 60 90 6 Ratio 0.6 0.4 0.2 0 -90 -60 -30 0 Angle [°] 30 60 90 Ratio 0.6 0.4 0.2 0 -90 -60 -30 0 Angle [°] 30 1pin 4 2 0 -40 -10 20 50 80 110 Ta [ ℃ ] Fig.4 Directional Characteristics 1 20.0 Fig.5 Directional Characteristics 2 200 Fluorescent Light Fig.6 Dark Response 15.0 10.0 5.0 Ratio 0.0 Kripton Light Halogen Light ICC @ Measurement Incandescent Light 150 100 -5.0 Artifical Sun Light 50 -10.0 -15.0 -20.0 -40 -20 0 20 40 60 80 100 Temperature / °C White LED 0 0 0.5 1 Ratio 1.5 2 2.3 2.4 2.5 2.6 2.7 VCC [ V ] 2.8 2.9 3 Fig.7 Measurement Result Temperature Dependency 10 Fig.8 Light Source Dependency ( Fluorescent Light is set to '1' ) 1.2 Fig.9 VCC – ICC ( During measurement ) 1 ICC @ POWER DOWN [ uA ] 0.8 Ratio 1 0.6 0.4 0.2 0.1 -40 -20 0 20 40 60 80 100 0 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 Ta [ ℃ ] VCC [ V ] Fig.10 VCC – ICC@0 Lx ( POWER DOWN ) Fig.11 Measurement Result VCC Dependency www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/13 2009.11 - Rev.A BH1780GLI ● Command Set Technical Note Address -0h Ah Bh Ch Dh Register name COMMAND CONTROL PART ID MANUFACTURE ID DATALOW DATAHIGH Register function Specifies register address Control of basic functions Part ID Manufacture ID Low byte of ADC High byte of ADC ○ Command Register 7 CMD 6 5 XXX 4 3 2 1 0 ADDRESS default value 00h Field CMD XXX ADDRESS Bit 7 6:4 3:0 Description Write 1 Write "000" Don't care if ADDRESS( Command Register< 3 : 0 > ) is "0h" or "Ah" or "Bh" or "Ch" or "Dh". Register address ○ Control Register ( 0h ) 7 RES 6 RES 5 RES 4 RES 3 RES 2 RES 1 POWER 0 default value 00h Field RES POWER Bit 7:2 1:0 Description Write "000000" "00" : Power down "01" : Resv "10" : Resv "11" : Power up www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/13 2009.11 - Rev.A BH1780GLI ○ PART ID Register ( Ah ) The PART ID register provides device identification. It is a read only register. 7 6 5 4 3 2 REV 1 0 Technical Note PART NO Field PARTNO REV Bit 7:4 3:0 Description "1000" "0001" ○ MANUFATCURE ID Register ( Bh ) The MANUFACTURE ID register provides device identification. It is a read only register. 7 6 5 4 3 2 1 0 MANUFACTURE ID Field MANUFACTURE ID Bit 7:0 Description "00000001" ○ ADC channel data registers ( Ch, Dh ) Illuminance data register. 7 6 5 4 3 2 1 0 CHANNEL DATA Register DATALOW DATAHIGH Address Ch Dh Bit 7:0 7:0 Description Lower byte Upper byte ● Lux calculation Measurement result is registered to ADC channel data registers(Ch, Dh) in below format. DATALOW ( Ch ) 7 27 DATAHIGH ( Dh ) 7 2 15 6 26 5 25 4 24 3 23 2 22 1 21 0 20 6 2 14 5 2 13 4 2 12 3 2 11 2 2 10 1 2 9 0 28 This is an example for DATA to Lux convertion when DATA Register values are seeing in below condition. ex) DATA Low Byte = "1001_0000" DATA High Byte = "1000_0011" ( 215 + 29 + 28 + 27 + 24 ) ≒ 33680 [ lx ] www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/13 2009.11 - Rev.A BH1780GLI ● Measurement sequence example from "Write instruction" to "Read measurement result" Technical Note from Master to Slave from Slave to Master ① Send Power up instruction. ST Slave Address 0101001 W 0 ACK Command Register 10000000 ACK Control Register ( 0h ) 00000011 ACK SP ② Change ADDRESS Field of Control Register to Ch( DATALOW ). ST Slave Address 0101001 W 0 ACK Command Register 10001100 ACK SP Wait 150ms until Measurement result is output. ③ Read measurement result. Slave Address 0101001 R 1 ST ACK DATALOW ( Ch ) ACK DATAHIGH ( Dh) ACK SP ④ Wait 150ms until measurement result is updated. ⑤ Read measurement result. Slave Address 0101001 R 1 ST ACK DATALOW ( Ch ) ACK DATAHIGH ( Dh) ACK SP ⑥ Send Power down instruction ST Slave Address 0101001 W 0 ACK Command Register 10000000 ACK Control Register ( 0h ) 00000000 ACK SP www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/13 2009.11 - Rev.A BH1780GLI ● I2C Bus Communication Technical Note 1) Slave Address "0101001" 2) Main write Format 1. Write to Command Register ST Slave Address 0101001 W 0 ACK Data to Command Register 1000XXXX ACK SP ※ Data must be "1000" 2. Write to Control Register ST Slave Address 0101001 W 0 ACK Data to Control Register 000000XX ACK SP ※ Data must be "000000" ※ It is necessary that ADDRESS Field of Command Register must set "0000". 3. Write to Command Register and Control Register ST Slave Address 0101001 W 0 ACK Command Register 1000XXXX ACK Control Register ( 0h ) 000000XX ACK SP 3) Main read Format ST Slave Address 0101001 R 1 ACK Data specified at ADDRESS Field of Command Register ACK Data specified at ADDRESS Field of Command Register+1 ACK ・・・・・・ ACK Data specified at ADDRESS Field of Command Register +N NACK SP 0h - Ah - BH1780GLI outputs Data from specified ADDRESS Field of Command Register until Master issues stop condition.Read cycle is Bh - Ch - Dh - 0h - Ah - Bh - Ch - Dh ……… ex) If ADDRESS Field of Command Register is Ch, then BH1780GLI outputs data like seeing in below. Ch - Dh -0h - Ah - Bh - Ch - Dh - 0h - Ah …. It is continued until Master issues stop condition. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/13 2009.11 - Rev.A BH1780GLI 4 ) High speed mode Technical Note BH1780GLI supports I2C bus High speed mode ( Hs-mode). Approximately 80uA is consumped when I2C bus is set at Hs-mode. Typical consumption current is seeing in below table. State Power down Power up F/S mode 0.7 120 Hs-mode 80 200 unit uA uA 8-bit Master code 00001xxx S SDAH A t1 tH SCLH 1 2 to 5 6 F/S mode 7 8 9 7-bit SLA Sr SDAH R/W A n x (8-bit DATA + A/A) Sr P SCLH 1 2 to 5 6 7 8 9 1 2 to 5 6 7 8 9 tFS Hs-mode If P then F/S mode If Sr (dotted lines) then Hs mode tH = MCS current source pull-up Consumption current increases in this term. Consumption current increases in this term = Rp resistor pull-up www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/13 2009.11 - Rev.A BH1780GLI ● Caution of power on reset function Technical Note BH1780GLI has power on reset ( POR ) function. POR is to reset all register and flip flop when VCC Power supplies. There is some cautions about power on and down sequence seeing in below. ① Power on time : t1 More than 2ms is need to active BH1780GLI after VCC supplies more than 1.9V from VCC is less than 0.4V. ② Power off time : t2 More than 1ms (VCC < 0.4V) is need to active BH1780GLI. 1.9V VCC 0.4V t1 BH1780GLI Don’t care active Don’t care active t2 t1 2 *”active state” is that BH1780GLI works and accept I C bus access correctly. ● Terminal Description PIN No. 1 Terminal Name Equivalent Circuit Function Power Supply Terminal VCC GND Terminal 2 GND I2C bus Interface SDA Terminal 3 SDA 2 I C bus Interface SCL Terminal 4 SCL www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/13 2009.11 - Rev.A BH1780GLI ● Package Outlines Technical Note ● Recommended Land pattern ( Top view ) 4 3 1 2 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/13 2009.11 - Rev.A BH1780GLI ●Cautions on use Technical Note 1) Absolute Maximum Ratings An excess in the absolute maximum ratings, such as supply voltage ( Vmax ), temperature range of operating conditions ( Topr ), etc., can break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety measures including the use of fuses, etc. 2) GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient. 3) Short circuit between terminals and erroneous mounting In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the terminal and the power supply or the GND terminal, the ICs can break down. 4) Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. 5) Inspection with set PCB On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress. Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for protection against static electricity, establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB. 6) Input terminals In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the input terminal. Therefore, pay thorough attention not to handle the input terminals; such as to apply to the input terminals a voltage lower than the GND respectively, so that any parasitic element will operate. 7) Thermal design Perform thermal design in which there are adequate margins by taking into account the power dissipation ( Pd ) in actual states of use. 8) Treatment of package Dusts or scratch on the photo detector may affect the optical characteristics. Please handle it with care. 9) Rush current When power is first supplied to the CMOS IC, it is possible that the internal logic may be unstable and rush current may flow instantaneously. Therefore, give special consideration to power coupling capacitance, power wiring, width of GND wiring, and routing of connections. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 12/13 2009.11 - Rev.A BH1780GLI ●Ordering part number Technical Note B H 1 Part No. 7 8 0 G L I - E 2 Part No. Package GLI: WLGA04IW02 Packaging and forming specification E2: Embossed tape and reel WLGA04IW02 1PIN MARK 2.0± 0.1 1 Top View 4 Tape Quantity Embossed carrier tape (with dry pack) 3000pcs E2 The direction is the 1pin of product is at the upper left when you hold 2.0 ± 0.1 (0.8MAX) 2 3 8 Direction of feed ( reel on the left hand and you pull out the tape on the right hand ) S 0.4± 0.1 0.6 1.2 0.2 0.08 S 0.325± 0.1 2 Bottom View 1.35 3 1 4 0.2 0.45 1pin (Unit : mm) Direction of feed Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/13 2009.11 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. 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If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. R0039A