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1/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. ambient light sensor ic series digital 16bit serial output type ambient light sensor ic BH1751FVI descriptions BH1751FVI is an digital ambient light sensor ic for i 2 c bus interface. this ic is the most suitable to obtain the ambient light data for adjusting lcd and keypad backlight power of mobile phon e. it is possible to detect wide range at high resolution. ( 1 - 65535 lx ). features 1) i2c bus interface (f / s mode support) 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) it is possible to select 2 type of i2c slave-address. 11) adjustable measurement result for influence of optical window ( it is possible to detect min. 0.11 lx, max. 100000 lx by using this function. ) 12) small measurement variation (+/- 20%) 13) the influence of infrared is very small. 14) build in power on reset circuit applications mobile phone, lcd tv, note pc, portable game machine, dig ital camera, digital video camera, car navigation, pda, lcd display absolute maximum ratings parameter symbol limits units supply voltage vmax 4.5 v operating temperature topr -40 85 storage temperature tstg -40 100 sda sink current imax 7 ma power dissipation pd 260 mw 70mm 70mm 1.6mm glass epoxy board. derating in done at 3.47mw/ for operating above ta=25 . operating conditions parameter symbol min. typ. max. units vcc voltage vcc 2.4 3.0 3.6 v i 2 c reference voltage v dvi 1.65 - v cc v no.10046eat09
BH1751FVI technical note 2/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. electrical characteristics ( v cc = 3.0v, dvi = 3.0v, ta = 25 , unless otherwise noted ) parameter symbol min. typ. max. units conditions supply current icc1 120 190 a ev = 100 lx 1 powerdown current icc2 0.85 1.5 a no input light peak wave length p 560 nm measurement accuracy s/ a 0.96 1.2 1.44 times sensor out / actual lx ev = 1000 lx 1, 2 dark ( 0 lx ) sensor out s0 0 0 3 count h-resolution mode 3 h-resolution mode resolution r hr 1 lx l-resolution mode resolution r lr 4 lx h-resolution mode measurement time t hr 120 180 ms l-resolution mode measurement time t lr 16 24 ms incandescent / fluorescent sensor out ratio ri f 1 times ev = 1000 lx addr input ?h? voltage v ah 0.7 * vcc v addr input ?l? voltage v al 0.3 * vcc v dvi input ?l? voltage v dvl 0.4 v scl, sda input ?h? voltage 1 v ih 1 0.7 * dvi v dvi R 1.8v scl, sda input ?h? voltage 2 v ih 2 1.26 v 1.65v Q dvi 1.8v scl, sda input ?l? voltage 1 v il 1 0.3 * dvi v dvi R 1.8v scl, sda input ?l? voltage 2 v il 2 dvi ? 1.26 v 1.65v Q dvi 1.8v scl, sda, addr input ?h? current i ih 10 a scl, sda, addr input ?l? current i il 10 a i 2 c scl clock frequency f scl 400 khz i 2 c bus free time t buf 1.3 s i 2 c hold time ( repeated ) start condition t hdsta 0.6 s i 2 c set up time for a repeated start condition t susta 0.6 s i 2 c set up time for a repeated stop condition t sustd 0.6 s i 2 c data hold time t hddat 0 0.9 s i 2 c data setup time t sudat 100 ns i 2 c ?l? period of the scl clock t low 1.3 s i 2 c ?h? period of the scl clock t high 0.6 s i 2 c sda output ?l? voltage v ol 0 0.4 v i ol = 3 ma 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 or h-resolution mode2 if dark data ( less than 10 lx ) is need.
BH1751FVI technical note 3/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio 1 10 100 1000 10000 100000 1 10 100 1000 10000 100000 illuminance [ lx ] measurement result 0 50 100 150 200 2 2.5 3 3.5 4 vcc [ v ] icc @ measurement 0 8 16 24 32 40 48 56 64 0 8 16 24 32 40 48 56 64 illuminance [ lx ] measurement result 0 0.2 0.4 0.6 0.8 1 1.2 22.533.54 vcc [ v ] ratio 0 0.2 0.4 0.6 0.8 1 1.2 1.5 2 2.5 3 3.5 dvi [ v ] ratio 00.511.52 fluorescent light incandescent light halogen light kripton light artifical sun light white led ratio 0 0.2 0.4 0.6 0.8 1 1.2 -40-20 0 20406080100 ta [ ] ratio 0.1 1 10 -40-20 0 20406080100 ta [ ] icc @ power down [ ua ] reference data 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio fig.8 light source dependency (fluorescent light is set to ?1?) fig.4 directional characteristics 1 fig.5 directional characteristics 2 fig.6 dark response w???? 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 ta [ ] measurement result h-res. l-res. h-res. - + - + - + - + 1pin 1pin fig.7 measurement accuracy temperature dependency fig.3 illuminance - measuremnet result 2 fig.9 v cc - i cc (during measurement) fig.10 v cc ? i cc @0 lx ( power down ) fig.1 spectral response fig.11 measurement result v cc dependency fig.12 measurement result dvi dependency dvi=1.8v vcc=3v 0 0.2 0.4 0.6 0.8 1 1.2 400 500 600 700 800 900 1000 1100 wavelength [ nm ] ratio fig.2 illuminance - measuremnet result 1
BH1751FVI technical note 4/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. block diagram 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. ? logic + i 2 c interface ambient light calculation and i 2 c 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 "0100_0101". ?osc internal oscillator ( typ. 320khz ). it is clk for internal logic. ?por power on reset. all register is reset after vcc is supplie d. please refer p.8 (caution of power on reset function). measurement procedure * "power on" command is possible to omit. scl sda gnd addr pd vcc dvi logic + i 2 c interface adc amp osc state transition by i 2 c write-command. automatically state transition state is automatically changed to power down mode. power supply power down power on measurement command initial state is power down mode after vcc and dvi supply. one time measurement continuous measurement por
BH1751FVI technical note 5/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. instruction set architecture instruction opecode comments power down 0000_0000 no active state. power on 0000_0001 waiting for measurement command. reset 0000_0111 reset data register value. reset command is not acceptable in power down mode. continuously h-resolution mode 0001_0000 start measurement at 1lx resolution. measurement time is typically 120ms. continuously h-resolution mode2 0001_0001 start measurement at 0.5lx resolution. measurement time is typically 120ms. continuously l-resolution mode 0001_0011 start measurement at 4lx resolution. measurement time is typically 16ms. one time h-resolution mode 0010_0000 start measurement at 1lx resolution. measurement time is typically 120ms. it is automatically set to power down mode after measurement. one time h-resolution mode2 0010_0001 start measurement at 0.5lx resolution. measurement time is typically 120ms. it is automatically set to power down mode after measurement. one time l-resolution mode 0010_0011 start measurement at 4lx resolution. measurement time is typically 16ms. it is automatically set to power down mode after measurement. change measurement time ( high bit ) 01000_mt[7,6,5] change measurement time. please refer "adjust measurement result for influence of optical window." change masurement time ( low bit ) 011_mt[4,3,2,1,0] change measurement time. please refer "adjust measurement result for influence of optical window." don't input the other opecode. measurement mode explanation measurement mode measur ement time. resolurtion h-resolution mode2 typ. 120ms. 0.5 lx h-resolution mode typ. 120ms. 1 lx. l-resolution mode typ. 16ms. 4 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 l x resolu tion so that it is suitable for darkness ( less than 10 lx ) h-resolution mode2 is also suitable to detect for darkness. explanation of asynchronous r eset and reset command "0000_0111" 1) asynchronous reset all registers are reset and BH1751FVI becomes power down duri ng dvi = 'l'. initial reset is not necessary, because power on reset function is included in this product. 2) reset command reset command is for only reset illuminance data register. ( rese t value is '0' )it is not necessary after power supply to vcc because power on reset function is included in this product. it is used for removing previous measurement result. this command is not working in power down mode, so that please set the power on mode before input this command.
BH1751FVI technical note 6/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. timing chart for vcc and dvi power supply sequence dvi is i 2 c bus reference voltage terminal. and it is also asynchronous reset terminal. in dvi 'l' term, internal state is set to power down mode.initial reset is not necessary, because power on reset function is included in this product. dvi supply with vcc supply, or after vcc supply. please do not become dvi vcc. 1) recommended timing chart1 for vcc and dvi supply. 2) recommended timing chart2 for vcc and dvi supply. ( if dvi can not supply with vcc supply ) vcc dvi vcc dvi
BH1751FVI technical note 7/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. measurement sequence example from "write instruction" to "read measurement result" ex1) continuously h-resolution mode ( addr = 'l' ) send "continuously h-resolution mode " instruction st 0100011 0 ack 00010000 ack sp wait to complete 1st h-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" ( 2 15 + 2 9 + 2 8 + 2 7 + 2 4 ) / 1.2 P 28067 [ lx ] the result of continuously measurement mode is updated.( 120ms.typ at h-reso lution mode, 16ms.typ at l-resolution mode ) ex2 ) one time l-resolution mode ( addr = 'h' ) send "one time l-resolution mode " instruction st 1011100 0 ack 00100011 ack sp wait to complete l- resolution mode measurement.( max. 24ms. ) read measurement result st 1011100 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" ( 2 8 + 2 4 ) / 1.2 P 227 [ lx ] in one time measurement, statement moves to power down m ode after measurement completi on.if updated resu lt is need then please resend measur ement instruction. from master to slave from slave to master
BH1751FVI technical note 8/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. application circuit example * i 2 c bus is trademark of phillips semiconductors. please refer formality specification for pull up resister. caution of power on reset function BH1751FVI has power on reset (por) function. por is to re set all register and flip flop when vcc power supplies. there are some cautions about power on and down sequence seeing in below. power on time : t1 more than 2ms is need to active BH1751FVI after vcc supplies more than 2.0v from vcc is less than 0.4v. power off time : t2 more than 1ms (vcc < 0.4v) is need to active BH1751FVI. *?active state? is that BH1751FVI works and accept i 2 c bus access correctly. 0.1f 0.1f vcc addr scl sda dvi gnd BH1751FVI 2.2kohm 2.2kohm micro controller i 2 c bus pull up resister i 2 c bus voltage source 0.4v vcc 2.0v active don?t care t1 BH1751FVI don?t care t2 t1 active
BH1751FVI technical note 9/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. i 2 c bus access 1) i 2 c bus interface timing chart write measurement command and read measurement result are done by i 2 c bus interface. please refer the formally specification of i 2 c bus interface, and follow the formally timing chart. 2) slave address slave address is 2 types, it is determined by addr terminal addr = ?h? ( addr R 0.7vcc ) ?1011100? addr = 'l' ( addr Q 0.3vcc ) ?0100011? 3) write format BH1751FVI is not able to accept plural command without stop condition. please insert sp every 1 opecode. st slave address r/w 0 ack opecode ack sp 4 ) read format st slave address r/w 1 ack high byte [15:8] 2 15 2 14 2 13 2 12 2 11 2 10 2 9 2 8 ack low byte [7:0] 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 ack sp ex ) high byte = "1000_0011" low byte = "1001_0000" ( 2 15 + 2 9 + 2 8 + 2 7 + 2 4 ) / 1.2 P 28067 [ lx ] * i 2 c bus is trademark of phillips semiconductors. please refer formality specification. from master to slave from slave to master t hd ; dat s sda scl s t hd ; sta t low t f t r t sr t su ; sta t su ; dat t f hd t su;sto t buf s p t r s t high t hd ; sta
BH1751FVI technical note 10/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. adjust measurement result for influence of opt ical window. (sensor sensitivity adjusting ) BH1751FVI is possible to change sensor sensitivity. and it is po ssible 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 regisiter). 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 times. ex) procedure for changing target sensor sensitivity to 2 times. please change mtreg from?0100_0101? ( default) to?1000_1010? (default * 2). 1) changing high bit of mtreg st slave address r/w 0 ack 01000_100 ack sp 2) changing low bit of mtreg st slave address r/w 0 ack 011_01010 ack sp 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 changable range of mtreg. min. typ. max. changable range of mtreg binary 0001_1111 ( sensitivity : default * 0.45 ) 0100_0101 default 1111_1110 ( sensitivity : default * 3.68 ) decimal 31 ( sensitivity : default * 0.45 ) 69 default 254 ( sensitivity : default * 3.68 ) it is possilbe to detect 0.23lx by using this function at h-resolu tion mode. and it is possilbe to detect 0.11lx by using this function at h-resolution mode2. the below formula is to calculate illuminance per 1 count. h-reslution mode: illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / x ) h-reslution mode2: illuminance per 1 count ( lx / count ) = 1 / 1.2 *( 69 / x ) / 2 1.2 : measurement accuracy 69 : default value of mtreg ( dec ) x : mtreg value the below table is seeing the detail of resolution. mtreg value lx / count at h-resolution mode lx / count at h-resolution mode2 0001_1111 1.85 0.93 0100_0101 0.83 0.42 1111_1110 0.23 0.11
BH1751FVI technical note 11/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. h-resolution mode2 h-resolution mode2 is 0.5lx (typ.) resolution mode. it is su itable if under less than 10 lx measurement data is necessary. this measurement mode supports ?adjust measur ement result for influence of optical wi ndow ". please refer it. it is possible to detect min. 0.11 lx by using h-resolution mode2. instruction set architecture for h-resolu tion mode2 instruction opecode comments continuously h-resolution mode2 0001_0001 start measurement at 0.5lx resolution. measurement time is typically 120ms. one time h-resolution mode2 0010_0001 start measurement at 0.5lx resolution. measurement time is typically 120ms. it is automatically set to powe r down mode after measurement. measurement sequence example from "write instruction" to "read measurement result" ex) continuously h-resolution mode2 ( addr = 'l' ) send "continuously h-resolution mode2 " instruction st 0100011 0 ack 00010001 ack sp wait to complete 1st h-resolution mode2 measurement.( max. 180ms. ) read measurement result. st 0100011 1 ack high byte [15:8] 2 14 2 13 2 12 2 11 2 10 2 9 2 8 2 7 ack low byte [7:0] 2 6 2 5 2 4 2 3 2 2 2 1 2 0 2 -1 ack sp how to calculate when the data high byte is "00000000" and low byte is "00010010" ( 2 3 + 2 0 ) / 1.2 P 7.5 [ lx ] from master to slave from slave to master
BH1751FVI technical note 12/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. terminal description pin no. terminal name equivalent circuit function 1 vcc power supply terminal 2 addr i 2 c slave-address terminal addr = ?h? ( addr R 0.7vcc ) ?1011100? addr = 'l' ( addr Q 0.3vcc ) ?0100011? addr terminal is designed as 3 state buffer for internal test. so that pl ease take care of vcc and dvi supply procedure.please see p6. 3 gnd gnd terminal 4 sda i 2 c bus interface sda terminal 5 dvi sda, scl reference voltage terminal and dvi terminal is also asynchronous reset for internal registers. initial reset is not necessary, because power on reset function is included in this product. 6 scl i 2 c bus interface scl terminal these values are design-value, not guaranteed. vcc
BH1751FVI technical note 13/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. 0.8 mm 1.3 mm pd area ( 0.25 mm x 0.3 mm ) please design the optical window so that light can cover at least this area. min.0.4 mm min.0.4 mm min.0.4 mm min.0.4 mm package outlines about an optical design on the device wsof6i ( unit : mm ) a lot no. b product no.
BH1751FVI technical note 14/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. the method of distinguishing 1pin. there is some method of distinguishing 1pin. distinguishing by 1pin wide-lead distinguishing by die pattern distinguishing by taper part of 1-3pin side distinguishing by 1pin line marking (by 1pin line marking ) is the easiest method to distinguish by naked eye. b a production code
BH1751FVI technical note 15/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. notes for use 1) absolute maximum ratings an excess in the absolute maximum ratings, such as supply vo ltage ( vmax ), temperature range of operating conditions ( topr ), etc., can break down devices, t hus 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 incl uding 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 t he 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 t he gnd terminal, the ics can break down. 4) operation in strong electromagnetic field be noted that using ics in the strong elec tromagnetic field can malfunction them. 5) inspection with set pcb on the inspection with the set pcb, if a capacitor is connec ted to a low-impedance ic terminal, the ic can suffer stress. therefore, be sure to discharge from the set pcb by each proc ess. furthermore, in order to mount or dismount the set pcb to/from the jig for the inspection process, be sure to tu rn 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 pr ocess and pay thorough attention to the transportation and the stor age of the set pcb. 6) input terminals in terms of the construction of ic, parasitic elements are inev itably formed in relation to potential. the operation of the parasitic element can cause interference with circuit operation, thus resulting in a malfunct ion and then breakdown of the input terminal. therefore, pay thorough attention not to handle t he 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 volt age lower than the power supply voltag e 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 characterist ics. please handle it with care. 9) rush current when power is first supplied to the cmos ic, it is possible t hat 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 wsof6i. this pad is gnd level, therefore there is a possibility that lsi malfunctions and heavy-current is generated.
BH1751FVI technical note 16/16 www.rohm.com 2010.02 - rev.a ? 2010 rohm co., ltd. all rights reserved. ordering part number b h 1 7 5 1 f v i - t r part no. part no. package fvi: wsof6i packaging and forming specification tr: embossed tape and reel direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin (unit : mm) wsof6i 0.22 0.05 0.75max (0.45) (0.15) 123 654 0.3 0.3 (1.2) (1.4) (1.5) 0.275 0.3 (max1.8 include burr) (max2.8 include burr) 1.6 0.1 0.145 3.0 0.1 0.27 0.05 2.6 0.1 654 123 0.50.5 0.5 0.525 0.08 m 0.08 s s 0.05
r1010 a www.rohm.com ? 2010 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redunda ncy, re 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, aerospac e 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 specied 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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