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Ambient Light Sensor IC Series
Digital 16bit Serial Output Type Ambient Light Sensor IC
BH1721FVC
No.10046EAT10
Descriptions 2 BH1721FVC 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 - 65528 lx ).
Features 2 1) I C bus Interface ( f / s Mode Support, Slave Address : "0100011" ) 2) Spectral responsibility is approximately human eye response 3) Illuminance to Digital Converter 4) Wide range and High resolution. (1 - 65528 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 (+/- 15%) 11) Compact surface mount package 1.6 x 1.6 x 0.55 mm
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 7 165
Units V mA mW
70mm x 70mm x 1.6mm glass epoxy board. Derating in done at 2.2mW/ for operating above Ta=25.
Operating Conditions Parameter VCC Voltage I C Reference Voltage
2
Symbol Vcc VDVI
Min. 2.4 1.65
Typ. 3.0 -
Max. 3.6 VCC
Units V V
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2010.02 - Rev.A
BH1721FVC
Electrical Characteristics ( VCC = 3.0V, DVI = 3.0V, Ta = 25, unless otherwise noted ) Parameter Supply Current Powerdown Current Peak Wave Length Measurement Accuracy Dark ( 0 lx ) Sensor out H-Resolution Mode Resolution L-Resolution Mode Resolution H-Resolution Mode Measurement Time L-Resolution Mode Measurement Time Incandescent / Fluorescent Sensor out ratio DVI Input `L' Voltage SCL, SDA Input `H' Voltage 1 SCL, SDA Input `H' Voltage 2 SCL, SDA Input `L' Voltage 1 SCL, SDA Input `L' Voltage 2 SCL, SDA, Input `H' Current SCL, SDA, Input `L' Current I2C SCL Clock Frequency I2C Bus Free Time I2C Hold Time ( repeated ) START Condition I2C Set up time for a Repeated START Condition I2C Set up time for a Repeated STOP Condition I2C Data Hold Time I2C Data Valid Time I2C Data Valid Acknowledge Time I2C Data Setup Time I2C `L' Period of the SCL Clock I2C `H' Period of the SCL Clock I2C SDA Output `L' Voltage Symbol Icc1 Icc2 p S/A S0 rHR rLR tHR tLR rIF VDVL VIH1 VIH2 VIL1 VIL2 IIH IIL fSCL tBUF tHDSTA tSUSTA tSUSTO tHDDAT tVDDAT tVDACK tSUDAT tLOW tHIGH VOL Min. 1.02 0 0.7 * DVI 1.26 1.3 0.6 0.6 0.6 0 100 1.3 0.6 0 Typ. 140 0.01 560 1.2 0 1 8 120 16 1 Max. 199 1.0 1.38 2 180 24 0.4 0.3 * DVI DVI - 1.26 10 10 400 0.9 0.9 0.4
Technical Note
Units Conditions A A nm times Sensor out / Actual lx EV = 1000 lx 1, 2
3
Ev = 100 lx
1
No input Light
count H-Resolution Mode lx lx ms ms times EV = 1000 lx V V V V V A A kHz s s s s s s s ns s s V IOL = 3 mA DVI 1.8V
1.65V DVI 1.8V DVI 1.8V 1.65V DVI 1.8V
1 White LED is used as optical source. 2 Measurement Accuracy typical value is possible to change '1' by "Measurement result adjustment function". 3 Use H-Resolution Mode if dark data ( less than 20 lx ) is need.
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2010.02 - Rev.A
BH1721FVC
Reference Data
1.2 1.0 0.8
Technical Note
64 56
100000
40 32 24 16 8
Measurement Result
32 40 48 56 64
Measurement Result
48
10000
Ratio
1000
0.6 0.4 0.2 0.0
400 500 600 700 800 900 1000 1100
H-Res. L-Res.
100
10
0
0 8 16
Wavelength [ nm ]
Illuminance [ lx ]
24
1
1 10 100 1000 10000 100000
Fig.1 Spectral Response
1.2 1
1.2 1
Fig.2 Illuminance Measurement Result 1
10
Fig.3 Illuminance Measuremnet Result 2
Illuminance [ lx ]
0.8
-
+
0.8
Measurement Result
1pin
Ratio
Ratio
8
+
0.6 0.4
6
0.6
-
1pin
0.2 0
-90 -60 -30 0
0.4
+
4
0.2 0
30 60 90
-90 -60 -30
+ +
2
H-Res.
0
60 90
-40 -20 0 20 40 60 80 100
0
30
Angle [ deg ]
Angle [ deg ]
Ta [ ]
Fig.4 Directional Characteristics 1
1.2 1 0.8
Fig.5 Directional Characteristics 2
200
Fig.6 Dark Response
Fluorescent Light Incandescent Light Halogen Light
ICC @ Measurement
150
Ratio
0.6
Kripton Light
100
0.4 0.2 0
-40 -20 0 20 40 60 80 100
Artifical Sun Light White LED
50
0
Ta [ ]
0 0.5
Ratio
1
1.5
2
2
2.5
3 VCC [ V ]
3.5
4
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)
1.2 1
ICC @ POWER DOWN [ uA ]
1
DVI=1.8V
1
VCC=3V
0.8
0.8
Ratio
Ratio
0.6
0.6 0.4 0.2 0
0.1
0.4
0.2
0.01 -40 -20 0 20 40 60 80 100
0 2 2.5 3 3.5 4
1.5
2
2.5
3
3.5
Ta [ ]
VCC [ V ]
DVI [ V ]
Fig.10 VCC - ICC@0 lx (POWER DOWN)
Fig.11 Measurement Result VCC Dependency
Fig.12 Measurement Result DVI Dependency
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BH1721FVC
Block Diagram VCC DVI
Technical Note
AMP
ADC
Logic + I C Interface
2
SCL SDA
PD OSC GND Block Diagram Descriptions 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". Measurement Time Register This is for registration of measurement time. Initial Value is "01_0010_1100". OSC Internal Oscillator. It is CLK for internal logic. Measurement Procedure
Power supply
Initial state is Power Down mode after VCC and DVI supply.
Power Down
Power On
Measurement command
State Transition by I2C write-command. Automatically State Transition Continuous measurement
* "Power On" Command is possible to omit.
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2010.02 - Rev.A
BH1721FVC
Instruction Set Architecture Instruction Power Down Power On Continuously Auto-Resolution Mode Continuously H-Resolution Mode
Technical Note
Opecode 0000_0000 0000_0001 0001_0000 0010_0000 0001_0010 0010_0010 0001_0011 0001_0110 0010_0011 0010_0110 010_MT[9,8,7,6,5] 011_MT[4]_XXXX No active state.
Comments
Waiting for measurement command. Switch measurement mode automatically by illuminance. Start measurement at 1lx resolution. Measurement Time is typically 120ms. Start measurement at 8lx resolution. Measurement Time is typically 16ms. Change measurement time.
Please refer "adjust measurement result for influence of optical window."
Continuously L-Resolution Mode
Change Measurement time ( High bit ) Change Masurement time ( Low bit )
Don't input the other opecode.
Change measurement time.
Please refer "adjust measurement result for influence of optical window."
Measurement mode explanation Measurement Mode Measurement Time. H-Resolution Mode L-Resolution Mode Typ. 120ms Typ. 16ms
Measurement Range. 0 - 8191 lx 0 - 65528 lx
Resolution 1 lx 8 lx
We recommend to use H-Resolution Mode. Measurement time (integration time) of H-Resolution Mode is so long that some kind of noise (including in 50Hz / 60Hz noise) is rejected. And H-Resolution Mode is 1 lx resolution so that it is suitable for darkness (less than 20 lx) Auto-Resolution mode selects measurement mode automatically. It is determined after 16ms (typ.) passes from measurement start. If BH1721FVC judges that current illuminance is more than 4000 lx, then Data is output at L-resolution mode, else Data is output after 120ms(typ.) from measurement start at H-resolution mode. Please refer below flow chart. Start
after 16ms.(typ.) Select mode Lux <= 4000 Lux > 4000
DATA output at L-resolution mode
Data output at H-resolution mode after 120ms passes from measurement start. Auto-Resolution mode measurement
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2010.02 - Rev.A
BH1721FVC
Technical Note
Timing chart for VCC and DVI power supply sequence DVI is I2C bus reference voltage terminal. And it is also asynchronous reset terminal. It is necessary to set to `L' after VCC is supplied. In DVI 'L' term, internal state is set to Power Down mode. 1) Recommended Timing chart1 for VCC and DVI supply.
VCC
DVI
Reset Term (more than 1s) 2) Timing chart2 for VCC and DVI supply. (If DVI rises within 1s after VCC supply)
VCC
DVI Reset Term (more than 1s) Don't care state
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2010.02 - Rev.A
BH1721FVC
Measurement sequence example from "Write instruction" to "Read measurement result" ex1) Continuously Auto-resolution mode from Master to Slave from Slave to Master
Technical Note
Send "Continuously Auto-resolution mode " instruction ST 0100011 0 Ack 00010000 Ack SP
Wait to complete 1st
Auto-resolution mode measurement.( max. 180ms )
Read measurement result. ST 0100011 1 Ack High Byte [ 15:8 ] Ack
Low Byte [ 7:0 ]
Ack
SP
How to calculate when the data High Byte is "10000011" and Low Byte is "10010000" 15 9 8 7 4 ( 2 + 2 + 2 + 2 + 2 ) / 1.2 28067 [ lx ] The result of continuously measurement mode is updated. ex2) Continuously L-resolution mode Send " Continuously L-resolution mode " instruction ST 0100011 0 Ack 00010011 Ack SP
Wait to complete L-resolution mode measurement.( max. 24ms ) Read measurement result ST 0100011 1 Ack High Byte [ 15:8 ] Ack
Low Byte [ 7:0 ]
Ack
SP
How to calculate when the data High Byte is "00000001" and Low Byte is "00010000" 8 4 ( 2 + 2 ) / 1.2 227 [ lx ]
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7/15
2010.02 - Rev.A
BH1721FVC
Technical Note
Application circuit example of DVI terminal The DVI terminal is an asynchronous reset terminal. Please note that there is a possibility that IC doesn't operate normally if the reset section is not installed after the start-up of VCC. (Please refer to the paragraph of "Timing chart for VCC and DVI power supply sequence") The description concerning SDA and the terminal SCL is omitted in this application circuit example. Please design the 2 application the standard of the I C bus as it finishes being satisfactory. ex 1) The control signal line such as CPU is connected.
BH1721FVC VCC SCL 0.1F GND 0.1F SDA DVI 0.1F
Micro Controller
ex 2) Reset IC is used. 1, For Reset IC of the Push-Pull type
BH1721FVC 0.1F VCC SCL GND 0.1F SDA DVI 0.1F RESET
Reset IC( Push-Pull type )
2, For Reset IC of the Open drain output
BH1721FVC 0.1F VCC SCL GND 0.1F SDA DVI 0.1F 1k RESET Reset IC( Open drain type )
ex 3) A different power supply is used.
BH1721FVC VCC SCL 0.1F V1 GND 0.1F SDA DVI V2 0.1F
Power supply of DVI must stand up later than power supply of VCC stand up, because it is necessary to secure reset section ( 1s or more ).
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2010.02 - Rev.A
BH1721FVC
Technical Note
ex 4) LPF using CR is inserted between VCC and DVI. This method has the possibility that the Reset section of turning on the power supply can not satisfied. Cannot be satisfied. Please design the set considering the characteristic of the power supply enough.
BH1721FVC 0.1F VCC SCL GND 0.1F SDA DVI C1 : 1F R1 : 1k
Notes when CR is inserted between VCC and DVI
Please note that there is a possibility that reset section ( 1s ) can not be satisfied because the power supply is turned on when the rise time of VCC is slow When VCC is turned off, the DVI voltage becomes higher than VCC voltage but IC destruction is not occred if recommended constant ( R1 = 1k, C1 = 1F ) is used. Please note that there is a possibility that Reset section (1sec) cannot be satisfied if wait time is not enough long after turning off VCC. (It is necessary to consider DVI voltage level after turning off VCC.)
t1
t2
VCC DVI 2.4V
0.4V 0V Reset Section: 1s or more
* Please do the application design to secure Reset section 1s or more after the reclosing of the power supply.
Example of designing set when CR ( C = 1F, R = 1k ) is inserted between VCC and DVI with VCC=2.8V The rise time to 02.4V of VCC must use the power supply of 100s or less. Please wait 25ms or more after VCC turn off ( VCC <= 0.05V ), because it is necessary to secure reset section (1s or more). Rise time of power supply: 100s or less 2.8V Time to power supply reclosing: 25ms or more
VCC DVI
2.4V
0.4V 0V 0V 0.05V Reset Section: 1s or more
* Please do the application design to secure Reset section 1s or more after the reclosing of the power supply.
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9/15
2010.02 - Rev.A
BH1721FVC
Technical Note
I2C Bus Access 1 ) I2C Bus Interface Timing chart 2 Write measurement command and Read measurement result are done by I C Bus interface. Please refer the formally 2 specification of I C Bus interface, and follow the formally timing chart.
SDA tf tLOW SCL tHD ; STA S tHD ; DAT tSU ; STA tHIGH t Sr tSU;STO P S tr tSU ; DAT tf tHD ; STA HD tr tBUF
2 ) Write Format BH1721FVC is not able to accept plural command without stop condition. Please insert SP every 1 Opecode. ST 3 ) Read Format ST Slave Address "0100011" R/W 1 Ack High Byte [15:8] 214 213 212 211 210 29 28 Ack Slave Address "0100011" R/W 0 Ack Opecode Ack SP
2
15
27
26
Low Byte [7:0] 25 24 23 22
21
20
Ack
SP
from Master to Slave ex ) High Byte = "1000_0011" Low Byte = "1001_0000" 15 9 8 7 4 ( 2 + 2 + 2 + 2 + 2 ) / 1.2 28067 [ lx ]
* Please refer formality I2C bus specification of NXP semiconductors.
from Slave to Master
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10/15
2010.02 - Rev.A
BH1721FVC
Technical Note
Adjust measurement result for influence of optical window. (sensor sensitivity adjusting ) BH1721FVC is possible to change sensor sensitivity. And it is possible to cancel the optical window influence (difference with / without optical window) by using this function. Adjust is done by changing measurement time. For example, when transmission rate of optical window is 50% (measurement result becomes 0.5 times if optical window is set), influence of optical window is ignored by changing sensor sensitivity from default to 2 times Sensor sensitivity is shift by changing the value of MTreg (measurement time register). MTreg value has to set 2 times if target of sensor sensitivity is 2 times. Measurement time is also set 2 times when MTreg value is changed from default to 2 2 times. Low 4bit value is fixed"1100". Please change high 6bit value of this register via to I C Bus interface. ex) Procedure for changing target sensor sensitivity to 2 times. Please change Mtreg from"01_0010_1100" (default) to"10_0101_1100" (default * 2). 1) Changing High bit of Mtreg ST Slave Address R/W 0 Ack 010_10010 Ack SP
2) Changing Low bit of Mtreg ST Slave Address R/W 0 Ack 011_1XXXX Ack SP
* X value is ignore.
3) Input Measurement Command. ST Slave Address R/W 0 Ack 0001_0000 Ack SP
* This example is High Resolution mode, but it accepts the other measurement.
4) After about 240ms, measurement result is registered to Data Register. (High Resolution mode is typically 120ms, but measurement time is set twice. ) The below table is seeing the changeable range of MTreg. Min. changeable range of MTreg binary decimal 00_1000_1100 ( sensitivity : default * 0.47 ) 140 ( sensitivity : default * 0.47 )
Typ. 01_0010_1100 default 300 default
Max. 11_1111_1100 ( sensitivity : default * 3.40 ) 1020 ( sensitivity : default * 3.40 )
It is possible to detect 0.25lx by using this function at H-resolution mode. The below formula is to calculate illuminance per 1 count. Illuminance per 1 count (lx / count) = 1 / 1.2 *(300 / X) 1.2 : Measurement accuracy 300 : Default value of MTreg ( dec ) X : MTreg value The below table is seeing the detail of resolution. MTreg value 00_1000_1100 01_0010_1100 11_1111_1100
lx / count 1.79 0.83 0.25
Please input the opecode at PowerDown state to change Mtreg.There is a possibility of malfunctioning when the opecode to change Mtreg is input while the illuminance measurement is going .
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2010.02 - Rev.A
BH1721FVC
Terminal Description PIN Terminal Name No. 1 VCC
Technical Note
Equivalent Circuit
Function
Power Supply Terminal
2
GND
GND Terminal
3
SDA
2 I C bus Interface SDA Terminal
4
DVI
150k
SDA, SCL Reference Voltage Terminal And DVI Terminal is also asynchronous Reset for internal registers.So that please set to 'L' ( at least 1s, DVI <= 0.4V ) after VCC is supplied. BH1721FVC is pulled down by 150k while DVI = 'L'.
5
SCL
2 I C bus Interface SCL Terminal
These values are design-value, not guaranteed.
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12/15
2010.02 - Rev.A
BH1721FVC
Package Outlines
Technical Note
A E
Production code
Lot No.
WSOF5 (Unit: mm) Optical design for the device
0.8 mm
0.6 mm Min.0.4 mm Min.0.4 mm
PD area (0.25 mm x 0.3 mm) Please design an optical window to have the focused light within this area.
Min.0.4 mm Min.0.4 mm
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2010.02 - Rev.A
BH1721FVC
Notes for 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. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied, apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics. 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. 10) The exposed central pad on the back side of the package There is an exposed central pad on the back side of the package. Please mount by Footprint dimensions described in the Jisso Information for WSOF5. This pad is GND level, therefore there is a possibility that LSI malfunctions and heavy-current is generated.
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14/15
2010.02 - Rev.A
BH1721FVC
Ordering part number
Technical Note
B
H
1
Part No.
7
2
1
F
V
C
-
T
R
Part No.
Package FVC: WSOF5
Packaging and forming specification TR: Embossed tape and reel
WSOF5

1.60.05 (0.8)
0.2MAX
Tape Quantity Direction of feed
Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
1.20.05 (MAX 1.28 include BURR)
1.00.05
(0.05)
(0.3)
1.60.05
5
4
4
5
(0.91)
(0.41)
( reel on the left hand and you pull out the tape on the right hand
1pin
)
123
321
0.130.05 S
0.6MAX
+0.03 0.02 -0.02
0.1 0.5 0.220.05
S 0.08
M
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
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15/15
2010.02 - 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, fuelcontroller 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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