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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 -4085 -40100 7 120 Units V mA mW
70mm x 70mm x 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
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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.
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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.
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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
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
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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
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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 ]
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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
Send Power up instruction. ST Slave Address 0101001 W 0 ACK Command Register 10000000 ACK
Control Register ( 0h ) 00000011
ACK
SP
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.
Read measurement result. Slave Address 0101001 R 1
ST
ACK
DATALOW ( Ch )
ACK
DATAHIGH ( Dh)
ACK
SP
Wait 150ms until measurement result is updated. Read measurement result. Slave Address 0101001 R 1
ST
ACK
DATALOW ( Ch )
ACK
DATAHIGH ( Dh)
ACK
SP
Send Power down instruction ST Slave Address 0101001 W 0 ACK Command Register 10000000 ACK
Control Register ( 0h ) 00000000
ACK
SP
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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<7:4> must be "1000" 2. Write to Control Register
ST
Slave Address 0101001
W 0
ACK
Data to Control Register 000000XX
ACK
SP
Data<7:2> 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.
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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
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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.
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.
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
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10/13
2009.11 - Rev.A
BH1780GLI
Package Outlines
Technical Note
Recommended Land pattern ( Top view )
4
3
1
2
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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.
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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

2.00.1
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
Bottom View
0.3250.1
2
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.
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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. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. 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.
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