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1/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. ambient light sensor ics digital 16bit serial output type ambient light sensor ic BH1710FVC descriptions BH1710FVC 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 phone. it is possible to detect wide range at high resolution. (1 - 65535 lx). features 1) i 2 c 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 i 2 c slave-address. 11) adjustable measurement result for influence of optical window (it is possible to detect min. 0.24 lx, max. 100000 lx by using this function.) applications mobile phone, lcd tv, note pc, portable game machine, dig ital camera, digital video camera, car navigation, pda, lcd display absolute maxi mum ratings parameter symbol ratings units supply voltage vmax 4.5 v operating temperature topr -30 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 ratings units min. typ. max. v cc voltage v cc 2.4 3.0 3.6 v i 2 c reference voltage v dvi 1.65 v cc v no.10046ebt07
BH1710FVC technical note 2/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. electrical characteristics (v cc = 3.0v, dvi = 3.0v, ta = 25 , unless otherwise noted) parameter symbol limits units conditions min. typ. max. supply current icc1 120 190 a ev = 100 lx 1 powerdown current icc2 0.01 0.2 a no input light peak wave length p 560 nm measurement accuracy s/a 0.75 1.2 1.65 times sensor out / actual lx ev = 1000 lx 1, 2 dark (0 lx) sensor out s0 0 0 2 count h-resolution mode 3 h-resolution mode resolution rhr 1 lx m-resolution mode resolution rmr 4 lx l-resosution mode resolution rlr 32 lx h-resolution mode measurement time thr 120 180 ms m-resolution mode measurement time tmr 16 24 ms l-resolution mode measurementt time tlr 2.9 4.5 ms incandescent / fluorescent sensor out ratio rif 1 times ev = 1000 lx addr input ?h? voltage vah 0.7 v cc v addr input ?l? voltage val 0.3 v cc v dvi input ?l? voltage vdvl 0.4 v scl, sda input ?h? voltage 1 vih1 0.7 dvi v dvi R 1.8v scl, sda input ?h? voltage 2 vih2 1.26 v 1.65v Q dvi 1.8v scl, sda input ?l? voltage 1 vil1 0.3 dvi v dvi R 1.8v scl, sda input ?l? voltage 2 vil2 dvi-1.26 v 1.65v Q dvi 1.8v scl, sda, addr input ?h? current iih 10 a scl, sda, addr input ?l? current iil 10 a i 2 c sda output ?l? voltage vol 0 0.4 v iol = 3 ma i 2 c scl clock frequency fscl 400 khz i 2 c hold time (repeated) start condition thdsta 0.6 s i 2 c ?l? period of the scl clock tlow 1.3 s i 2 c ?h? period of the scl clock thigh 0.6 s i 2 c set up time for a repeated start condition tsusta 0.6 s i 2 c data hold time thddat 0 0.9 s i 2 c data setup time tsudat 100 ns i 2 c set up time for stop condition tsusto 0.6 s i 2 c bus free time between a stop and start condition tbuf 1.3 s 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 10 lx) is need.
BH1710FVC technical note 3/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. reference data 0 8 16 24 32 40 48 56 64 0 8 16 24 32 40 48 56 64 illuminance [ lx ] measurement result fig.8 light source dependency ( fluorescent light is set to '1' ) 0 0.2 0.4 0.6 0.8 1 1.2 -30 0 30 60 90 ta [ ] ratio 1 10 100 1000 10000 100000 1 10 100 1000 10000 100000 illuminance [ lx ] measurement result fig.4 directional characteristics 1 fig.5 directional characteristics 2 fig.6 dark response w???? vcc vs. icc@ y ? 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio 0 0.2 0.4 0.6 0.8 1 1.2 -90 -60 -30 0 30 60 90 angle [ deg ] ratio 0 2 4 6 8 10 -30 0 30 60 90 ta [ ] measurement result 0 50 100 150 200 2 2.5 3 3.5 4 vcc [ v ] icc @ measurement 00.511.52 fluorescent light incandescent light halogen light kripton light artifical sun light white led ratio h-res. m-res. l-res. h-res. - + - + - + - + 1pin 1pin 0 0.2 0.4 0.6 0.8 1 1.2 400 500 600 700 800 900 1000 1100 wavelength [ nm ] ratio 0.01 0.1 1 10 -20 0 20 40 60 80 ta [ ] icc @ power down [ ua ] fig.7 measurement result temperature dependency fig.2 illuminance ? measurement result 1 fig.3 illuminance ? measurement result 2 fig.9 v cc ? i cc ( during measurement ) fig.10 v cc ? i cc @0 lx ( power down ) fig.1 spectral response 0 0.2 0.4 0.6 0.8 1 1.2 22.533.54 vcc [ v ] ratio fig.11 measurement result v cc dependency 0 0.2 0.4 0.6 0.8 1 1.2 1.5 2 2.5 3 3.5 dvi [ v ] ratio fig.12 measurement result dvi dependency dvi=1.8v vcc=3v
BH1710FVC technical note 4/16 www.rohm.com 2010.06 - rev.b ? 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 "01_0010_1100". osc internal oscillator (typ. 320khz). it is clk for internal logic. 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
BH1710FVC technical note 5/16 www.rohm.com 2010.06 - rev.b ? 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 m-resolution mode 0001_0011 start measurement at 4lx resolution. measurement time is typically 16ms. continuously l-resolution mode 0001_0110 start measurement at 32lx resolution. measurement time is typically 2.9ms. 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 m-resolution mode 0010_0011 start measurement at 4lx resolution. measurement time is typically 16ms. it is automatically set to power down mode after measurement. one time l-resolution mode 0010_0110 start measurement at 32lx resolution. measurement time is typically 2.9ms. it is automatically set to power down mode after measurement. change measurement time (high bit) 010_mt[9,8,7,6,5] change measurement time. please refer "adjust measurement result for influence of optical window." change measurement 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. resolution h-resolution mode typ. 120ms. 1 lx. m-resolution mode typ. 16ms. 4 lx. l-resolution mode typ. 2.9ms. 32 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 resolution so that it is suitable for darkness (less than 10 lx)
BH1710FVC technical note 6/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. explanation of asynchronous reset and reset command "0000_0111" 1) asynchronous reset all registers are reset. it is necessary on power supply sequence. please refer "timing chart for vcc and dvi power supply sequence" in this page. it is power down mode during dvi = 'l'. 2) reset command reset command is for only reset illuminance data register. (re set value is '0') it is not necessary even power supply sequence. it is used for removing previous measurement resu lt. this command is not working in power down mode, so that please set the power on mode before input this command. timing chart for v cc and dvi power supply sequence dvi is i 2 c 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. 2) timing chart2 for vcc and dvi supply. (if dvi rises within 1s after vcc supply) vcc dvi reset term ( more than 1s ) vcc dvi don't care state addr, sda, scl is not stable if dvi 'l' term (1s) is not given by systems. in this case, please connect the resisters (a pproximately 100kohm) to addr without directly connecting to vcc or gnd, because it is 3 state buffer for internal testing. reset term (more than 1s)
BH1710FVC technical note 7/16 www.rohm.com 2010.06 - rev.b ? 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-resolu tion 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 measurem ent mode is updated.(120ms.typ at h-reso lution mode, 16ms.typ at m-resolution mode, 2.9ms.typ at l-resolution mode) ex2) one time m-resolution mode (addr = 'h') send "one time m-resolution mode " instruction st 1011100 0 ack 00100011 ack sp wait to complete m-resoluti on 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 mode after measurement completion. if updated result is need then please resend measurement instruction. from master to slave from slave to master
BH1710FVC technical note 8/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. application circuit example of dvi terminal the dvi terminal is an asynchronous reset terminal. please note that there is a possibility t hat ic doesn't operate normally if the reset section is not installe d 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 omi tted in this application circuit example. please design the application the standard of the i 2 c bus as it finishes being satisfactory. mo reover, the description concerning the terminal addr is omitted. please refer to the paragraph of "timi ng chart for vcc and dvi power supply sequence" about the terminal addr design. ex 1) the control signal line such as cpu is connected. ex 2) reset ic is used. 1, for reset ic of the push-pull type 2, for reset ic of the open drain output ex 3) a different power supply is used. power supply of dvi must stand up later than power supply of vcc stand up, because it is necessary to secure reset section (1 s or more). micro controller vcc addr scl sda 0.1f 0.1f dvi gnd BH1710FVC vcc addr scl sda 0.1f dvi gnd reset reset ic( psh-pull type ) BH1710FVC 0.1f vcc addr scl sda 0.1f dvi gnd reset ic( open drain type ) reset 1kohm BH1710FVC 0.1 f BH1710FVC vcc addr scl sda 0.1f dvi gnd 0.1f v2 v1
BH1710FVC technical note 9/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. ex 4) lpf using cr is inserted between v cc and dvi. this method has the possibility that the reset section of turn ing on the power supply can not satisfied. cannot be satisfied. please design the set considering the char acteristic of the power supply enough. notes when cr is inserted between v cc and dvi please note that there is a possibility that reset section (1s) can not be sa tisfied because the power supply is turned on w hen 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 occurred if recommended con stant (r1 = 1kohm, c1 = 1f) is used. please note that there is a possibility that reset section (1us ec) cannot be satisfied if wait time is not enough long after t urning off vcc. (it is necessary to consider dvi voltage level after turning off vcc.) example of designing set when cr (c = 1f, r = 1k ? ) is inserted between v cc and dvi with v cc =2.8v the rise time to 0 2.4v of vcc must use the power supply of 100s or less. please wait 25ms or more after vcc turn off (vcc <= 0.05v), bec ause it is necessary to secure reset section (1s or more). r1 : 1kohm 0.1f c1 : 1f vcc addr gnd scl dvi sda BH1710FVC reset section : 1s or more t1 vcc dvi 2.4v 0.4v 0v * please do the application design to secure reset section 1s or more after the reclosing of the power supply. reset section : 1s or more rise time of power supply : 100s or less 0.05v time to power supply reclosing : 25ms or more v cc dvi 2.4v 0.4v 2.8v 0v t2 *please do the application design to secure reset secti on 1s or more after the reclosing of the power supply.
BH1710FVC technical note 10/16 www.rohm.com 2010.06 - rev.b ? 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 BH1710FVC 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 ] * please refer formality i 2 c bus specification of nxp semiconductors. t hd ; dat s sda scl t hd ; sta t low t f t r sr t su ; sta t su ; dat t f t su;sto t buf p t r s t high t hd ; sta from master to slave from slave to master
BH1710FVC technical note 11/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. adjust measurement result for influence of optical window. (sensor sensitivity adjusting ) BH1710FVC 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 (m easurement time register). mtr eg 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 s ensor sensitivity to 2 times. please change mtreg from ? 01_0010_1100? ( def ault ) to ? 10_0101_1000? ( 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_11000 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 changeable range of mtreg. min. typ. max. changeable range of mtreg binary 00100_01100 (sensitivity : default*0.47) 01001_01100 default 11111_11110 (sensitivity : default*3.41) decimal 140 (sensitivity : default*0.47) 300 default 1022 (sensitivity : default*3.41) it is possible to detect 0.24lx 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 x : mtreg value the below table is seeing the detail of resolution. mtreg value lx / count 00100_01100 1.79 01001_01100 0.83 11111_11110 0.24 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 .
BH1710FVC technical note 12/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. terminal description pin no. pin 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.so that please set to 'l' (at least 1s, dvi <= 0.4v) after vcc is supplied. BH1710FVC is pulled down by 150kohm while dvi = 'l'. 6 scl i 2 c bus interface scl terminal these values are design-value, not guaranteed. 150kohm vcc
BH1710FVC technical note 13/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. wsof6 ( unit : mm ) a b lot no. production code package outlines about an optical design on the device 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
BH1710FVC technical note 14/16 www.rohm.com 2010.06 - rev.b ? 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 (by die pattern) is the easiest method to distinguish by naked eye. b a production code
BH1710FVC technical note 15/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. cautions on use 1) absolute maximum ratings an excess in the absolute maximum rating s, such as supply voltage (vmax), temper ature range of oper ating conditions (topr), etc., can break down dev ices, 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 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. but please do it non connection. (don't solder, and don't do electrical connection) please mount by footprint dim ensions described in the jisso information for wsof6. this pad is gnd level, therefore ther e is a possibility that lsi malfunc tions and heavy-current is generated.
BH1710FVC technical note 16/16 www.rohm.com 2010.06 - rev.b ? 2010 rohm co., ltd. all rights reserved. ordering part number b h 1 7 1 0 f v c - t r part no. part no. 1710 package fvc: wsof6 packaging and forming specification tr: embossed tape and reel (wsof6) 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) wsof6 s 0.08 m 0.08 s 654 23 1 456 21 3 (max1.8 include burr) (max2.8 include burr) 2.6 0.1 0.3 1.6 0.1 3.0 0.1 0.75max 0.5 0.22 0.05 (0.45) (0.15) 0.145 0.05 (1.5) (1.2) 1pin mark
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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