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? 2014 microchip technology inc. ds20005311a-page 1 hv9921/hv9922/hv9923 features constant output current: - hv9921 C 20ma - hv9922 C 50ma - hv9923 C 30ma universal 85 - 264vac operation fixed off-time buck converter internal 475v power mosfet applications decorative lighting low power lighting fixtures descriptionhv9921/hv9922/hv9923 are pulse-width modulated (pwm), high-efficiency, led driver control ics. they allow efficient operation of led strings from voltage sources ranging up to 400vdc. hv9921/22/23 include an internal high voltage switching mosfet controlled with fixed off-time (t off ) of approximately 10 s. the led string is driven at constant current, thus providing constant light output and enhanced reliability. the out- put current is internally fixed at 20ma for hv9921, 50ma for hv992, and 30ma for hv9923. the peak cur- rent control scheme provides good regulation of the output current throughout the universal ac line voltage range of 85 to 264vac or dc input voltage of 20 to 400v. 3-pin switch-mode led lamp driver ics downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 2 ? 2014 microchip technology inc. to our valued customers it is our intention to provide our valued customers with the best documentation possible to ensure successful use of your micro chip products. to this end, we will continue to improve our publications to better suit your needs. our publications will be refined and enhanced as new volumes and updates are introduced. if you have any questions or comments regarding this publication, please contact the marketing communications department via e-mail at docerrors@microchip.com . we welcome your feedback. most current data sheet to obtain the most up-to-date version of this data sheet, please register at our worldwide web site at: http://www.microchip.com you can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page . the last character of the literature number is the version number, (e.g., ds30000000a is version a of document ds30000000). errata an errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for curren t devices. as device/documentation issues become known to us, we will publish an errata sheet. the errata will specify the revisi on of silicon and revision of document to which it applies. to determine if an errata sheet exists for a particular device, please check with one of the following: microchips worldwide web site; http://www.microchip.com your local microchip sales office (see last page) when contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are using. customer notification systemregister on our web site at www.microchip.com to receive the most current information on all of our products. downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 3 hv9921/hv9922/hv9923 pin diagram typical application circuit 1 2 3 1 2 3 to-92 to-243aa (sot-89) see table 2-1 for pin information. hv9921/22/23 led 1 - led n 3 vdd drain 1 gnd 2 ac downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 4 ? 2014 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings supply voltage v dd ................................ -0.3v to +10v supply current i dd ..............................................+5ma operating ambient temperature ...........-40c to +85c operating junction temperature ........-40c to +125c storage temperature ..........................-65c to +150c power dissipation @+25c for to-92 .............740 mw power dissipation @+25c for sot-89....... 1600 mw* * mounted on fr4 board, 24mmx25mmx1.57mmnote : stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other condi- tions, above those indicated in the operational listings of this specification, is not implied. exposure to maxi- mum rating conditions for extended periods may affect device reliability. 1.1 electrical specifications table 1-1: electrical characteristics 1 symbol parameter notes min typ max units conditions regulator (v dd ) v dd v dd regulator output - - 7.5 - v v drain v drain supply voltage - 20 - - v v uvlo v dd under-voltage threshold - 5.0 - - v v uvlo v dd under-voltage lockout hysteresis - - 200 - mv i dd operating supply current - - 200 350 a v dd(ext) = 8.5v, v drain = 40v output (drain) v br breakdown voltage 2 475 - - v r on on resistance - - - 210 i drain = 20ma (hv9921) i drain = 50ma (hv9922) i drain = 30ma (hv9923) c drain output capacitance 3 -15p fv drain = 400v i sat mosfet saturation current 3 100 150 - ma current sense comparator i thl threshold current - hv9921 2 18.5 - 25.5 ma threshold current - hv9922 2 49 - 63 ma threshold current - hv9923 2 28.2 - 38.2 ma t blank leading edge blanking delay 2 , 3 200 300 400 ns t on(min) minimum on time - - - 650 ns off-time generator t off off time - 8 10.5 13 s 1 specifications are t a = 25c, v drain = 50v unless otherwise noted. 2 applies over the full operating ambient temperature range of -40c < t a < +125c. 3 for design guidance only downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 5 hv9921/hv9922/hv9923 figure 1-1: typical performance characteristics (t j = 25c unless otherwise noted) thermal resistance package ja to-92 132c/w to-243aa(sot-89) 133c/w 200180 160 140 120 100 8060 40 20 0 junction temperature (c) on resistance () 580570 560 550 540 530 520 510 500 490 junction temperature (c) drain breakdown voltage (v) 180160 140 120 100 8060 40 20 0 drain voltage (v) drain current (ma) 1210 86 4 2 0 junction temperature (c) off time (s) 1000 100 10 1 0 10 20 30 40 drain voltage (v) drain capacitance (pf) t j = 25c t j = 125c 1.101.05 1.00 0.95 0.90 0.85 0.80 -40 -15 10 35 60 85 110 junction temperature, c normalized threshold current -40 -15 10 35 60 85 110 -40 -15 10 35 60 85 110 -40 -15 10 35 60 85 110 0 10 20 30 40 downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 6 ? 2014 microchip technology inc. 2.0 pin description see pin diagram on page 3 for the figures. 3.0 functional description the hv9921/22/23 are pwm peak current controllers designed to control a buck converter topology in contin- uous conduction mode (ccm). the output current is internally preset at 20ma for hv9921, 50ma for hv992, and 30ma for hv9923. when the input voltage of 20 to 400v appears at the drain pin, the internal high-voltage linear regulator seeks to maintain a voltage of 7.5vdc at the v dd pin. until this voltage exceeds the internally programmedunder-voltage threshold, the output switching mosfet is non-conductive. when the threshold is exceeded, the mosfet turns on. the input current begins to flow into the drain pin. hysteresis is provided in the under- voltage comparator to prevent oscillation. when the input current exceeds the internal preset level, a current sense comparator resets an rs flip- flop, and the mosfet turns off. at the same time, a one-shot circuit is activated that determines the dura- tion of the off-state (10.5 s typical). as soon as this time is over, the flip-flop sets again. the new switching cycle begins. a blanking delay of 300ns is provided that prevents false triggering of the current sense comparator due tothe leading edge spike caused by circuit parasitics. 4.0 application information hv9921/22/23 are low-cost off-line buck converter ics specifically designed for driving multi-led strings. they can be operated from either universal ac line range of 85 to 264vac, or 20 to 400vdc, and drive up to tens of high-brightness leds. all leds can be run in series, and the hv9921/22/23 regulate at constant cur- rent, yielding uniform illumination. hv9921/22/23 are compatible with triac dimmers. the output current is internally fixed at 20ma for hv9921, 50ma for hv9922, and 30ma for hv9923. these parts are available in space saving to-92 and sot-89 packages. 4.1 selecting l1 and d1 there is a certain trade-off to be considered between optimal sizing of the output inductor l1 and the toler- ated output current ripple. the required value of l1 is inversely proportional to the ripple current ? i o in it. v o is the forward voltage of the led string. t off is the off-time of hv9921/22/23. the output current in the led string (i o ) is calculated then as: where i th is the current sense comparator threshold. the ripple current introduces a peak-to-average error in the output current setting that needs to be accounted for. due to the constant off-time control technique used in hv9921/22/23, the ripple current is independent of the input ac or dc line voltage variation. therefore, the output current will remain unaffected by the varying input voltage. adding a filter capacitor across the led string can reduce the output current ripple even further, thus per- mitting a reduced value of l1. however, keep in mind that the peak-to-average current error is affected by the variation of t off . therefore, the initial output current accuracy might be sacrificed at large ripple current inl1. another important aspect of designing an led driver with the hv9921/22/23 is related to certain parasiticelements of the circuit, including distributed coil capac- itance of l1, junction capacitance and reverse recovery of the rectifier diode d1, capacitance of the printed cir- cuit board traces c pcb and output capacitance c drain of the controller itself. these parasitic elements affect the efficiency of the switching converter and could potentially cause false triggering of the current sense comparator if not properly managed. minimizing these parasitics is essential for efficient and reliable operation of the hv9921/22/23. table 2-1: pin description pin # name description 1 drain drain terminal of the output switching mosfet and a linear regulator input 2 gnd common connection for all circuits 3 vdd power supply pin for all control circuits. by pass this pin with a 0.1 f low-impedance capacitor l1 v o t off ? i o ? ------------------------------ - = i o i th 12 -- - i o ?? ?? C = downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 7 hv9921/hv9922/hv9923 coil capacitance of inductors is typically provided in the manufacturers data books either directly or in terms of the self-resonant frequency (srf). where l is the inductance value, and c l is the coil capacitance.) charging and discharging this capaci-tance every switching cycle causes high-current spikes in the led string. therefore, connecting a small capac- itor c o (~10nf) is recommended to bypass these spikes.using an ultra-fast rectifier diode for d1 is recom- mended to achieve high efficiency and reduce the risk of false triggering of the current sense comparator. using diodes with shorter reverse recovery time, t rr , and lower junction capacitance, c j , achieves better performance. the reverse voltage rating, v r , of the diode must be greater than the maximum input voltageof the led lamp. the total parasitic capacitance present at the drain pin of the hv9921/22/23 can be calculated as:when the switching mosfet turns on, the capaci- tance c p is discharged into the drain pin of the ic. the discharge current is limited to about 150ma typi- cally. however, it may become lower at increased junc- tion temperature. the duration of the leading edge current spike can be estimated as: in order to avoid false triggering of the current sense comparator, c p must be minimized in accordance with the following expression:where t blank(min) is the minimum blanking time of 200ns, and v in(max) is the maximum instantaneous input voltage. 4.2 estimating power loss discharging the parasitic capacitance cp into the drain pin of the hv9921/22/23 is responsible for the bulk of the switching power loss. it can be estimated using the following equation: where f s is the switching frequency, i sat is the satu- rated drain current of the hv9921/22/23. the switch- ing loss is the greatest at the maximum input voltage. the switching frequency is given by the following equa- tion.when the hv9921/22/23 led driver is powered from the full-wave rectified ac input, the switching power loss can be estimated as: v ac is the input ac line voltage. the switching power loss associated with turn-off tran- sitions of the drain pin can be disregarded. due to thelarge amount of parasitic capacitance connected to this switching node, the turn-off transition occurs essen- tially at zero-voltage. conduction power loss in the hv9921/22/23 can be calculated as: where d = v o /v in is the duty ratio, r on is the on-resis- tance, i dd is the internal linear regulator current. when the led driver is powered from the full-wave rec- tified ac line input, the exact equation for calculating the conduction loss is more cumbersome. however, it can be estimated using the following equation: where v ac is the input ac line voltage. the coefficients k c and k d can be determined from the minimum duty ratio of the hv9921/22/23. srf 1 2 ? lc l ? ?? ?? ?? ? = c p c drain c pcb c l c j +++ = t spike v in c p ? i sat ------------------- - t rr + = c p i sat t blank min ?? t rr C ?? ? v in max ?? -------------------------------------------------------- - ? p switch v in 2 c p 2 ----------------- - v in i ? sat t rr ? + ?? ?? f s ? = f s v in v o C v in t off ? ------------------------ - = p switch 1 2t off ? ------------------- - v ac c p 2i sat t rr ? ? + ? ?? v ac v o C ?? ? p cond di o 2 r on i dd v in 1d C ?? ? ? + ? ? = p cond k c i o 2 r on k d i dd v ac ? ? + ? ? = downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 8 ? 2014 microchip technology inc. figure 4-1: conduction loss coefficients k c and k d 4.3 emi filter as with all off-line converters, selecting an input filter is critical to obtaining good emi. a switching side capaci- tor, albeit of small value, is necessary in order to ensure low impedance to the high frequency switching cur- rents of the converter. as a rule of thumb, this capacitor should be approximately 0.1-0.2 f/w of led output power. a recommended input filter is shown in figure 4-2 for the following design example. 4.3.1 design example the following example designs a hv9921 led lamp driver meeting the following specifications: input: universal ac, 85-265vac output current: 20ma load: string of 10 led (lw541c by osram vf = 4.1v max. each) 4.3.1.1 step 1. calculating l1. the output voltage v o = 10 x v f 41v (max.). use this equation assuming a 30% peak-to-peak ripple. select l1 68mh, i = 30ma. typical srf = 170khz. calculate the coil capacitance. 4.3.1.2 step 2. selecting d1 usually, the reverse recovery characteristics of ultra- fast rectifiers at i f = 20 ~ 50ma are not provided in the manufacturers data books. the designer may want to experiment with different diodes to achieve the best result. select d1 mur160 with v r = 600v, t rr 20ns (i f = 20ma, i rr = 100ma) and c j 8pf (vf > 50v). 4.3.1.3 step 3. calculating total parasitic capacitance 4.3.1.4 step 4. calculating the leading edge spike duration 4.3.1.5 step 5. estimating power dissipation in hv9921 at 265vac switching power loss:minimum duty ratio: conduction power loss: total power dissipation in hv9921: 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.7 0.6 0.5 0.4 0.3 0.2 0.1 kd(dm)kc(dm) dm l1 41v 10.5 ? s ? 0.3 20ma ? --------------------------------- - 72mh = = c l 1 l1 2 ? srf ? ?? 2 ? ----------------------------------------- - 1 68mh 2 ? 170khz ? ?? 2 ? ------------------------------------------------------------ - 13p f = == c p 5pf 5pf 13pf 8pf 13pf = ++ + = t spike 264v 2 31pf ? ? 100ma -------------------------------------------- 20ns 136ns t blank min ?? ? ? + = p switch 1 2 10.5 ? s ? ------------------------- - 264v 31pf 2 100ma 20ns ? ? + ? ?? 264v 41v C ? ? ? 131mw ? ? d m 41v 265v 2 ? ------------------------- - 0.11 ? = p cond 0.25 20ma ?? 2 ? 210 ? ? 0.63 200 ? a 264v 55mw ? ? ? + = p total 131mw 55mw 186mw = + = downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 9 hv9921/hv9922/hv9923 4.3.1.6 step 6. selecting input capacitor c in select c in ecq-e4104kf by panasonic ? (0.1 f, 400v, metalized polyester film). figure 4-2: universal 85-264vac led lamp driver figure 4-3: typical efficiency figure 4-4: switch-off transition ch1:v drain , ch3: i drain outputpower 41v 20ma 820mw = ? = c in ac line 85-265v c dd 3 hv9921/22/23 d1 l1 led 1 - led 12 d2 d3 d4 d5 c in2 l in vrd1 f1 c o vdd drain gnd 1 2 75 100 125 150 175 200 225 250 275 8280 78 76 74 72 70 68 66 64 62 input ac line voltage (vac) efficiency (%) zero voltage transition downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 10 ? 2014 microchip technology inc. figure 4-5: typical efficiency figure 4-6: switch-off transition ch1:v drain , ch3: i drain figure 4-7: functional block diagram leading edge spike 25ma switch off vdd ref r drain gnd hv9921/hv9922/hv9923 regulator 7.5v t blank = 300ns + - s r q q t off = 10.5s downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 11 hv9921/hv9922/hv9923 5.0 layout considerations for a recommended circuit board layout for the hv9921/22/23, see figure 5-1 . 5.1 single point grounding use a single point ground connection from the input fil- ter capacitor to the area of copper connected to the gnd pin. 5.2 bypass capacitor (c dd ) the v dd pin bypass capacitor c dd should be located as near as possible to the v dd and gnd pins. 5.3 switching loop areas the area of the switching loop connecting the input fil- ter capacitor c in , the diode d1 and the hv9921/22/23 together should be kept as small as possible. the switching loop area connecting the output filter capacitor c o , the inductor l1 and the diode d1 together should be kept as small as possible. 5.4 thermal considerations vs. radiated emi the copper area where gnd pin is connected acts not only as a single point ground, but also as a heat sink. this area should be maximized for good heat sinking, especially when the sot-89 package is used. the same applies to the cathode of the free-wheeling diode d1. both nodes are quiet; therefore, they will not cause radiated rf emission. the switching node copper area connected to the drain pin of the hv9921/22/23, the anode of d1 and the inductor l1 needs to be mini- mized. a large switching node area can increase high frequency radiated emi. 5.5 input filter layout considerations the input circuits of the emi filter must not be placed in the direct proximity to the inductor l1 in order to avoid magnetic coupling of its leakage fields. this consider- ation is especially important when unshielded con- struction of l1 is used. when an axial input emi filter inductor l in is selected, it must be positioned orthogo- nal with respect to l1. the loop area formed by c in2 , l in and c in should be minimized. the input lead wires must be twisted together. figure 5-1: recommended circuit board layout with hv9921/22/23 d2-5 l in c o l1 u1 vrd1 c in c in2 d1 c dd f1 ac line 85-264vac led + led - component side view downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 12 ? 2014 microchip technology inc. 6.0 packaging information 6.1 package marking information 3-lead to-92 ywwnnn xxxxxxxxxx e 3 example ywwnnn hv9921n3 e 3 3-lead to-243aa* (sot-89) example xxxyyww nnn h21yyww nnn legend: xx...x product code or customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code pb-free jedec ? designator for matte tin (sn) * this package is pb-free. the pb-free jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of availablecharacters for product code or customer-specific information. package may or may not include the corporate logo. 3 e 3 e downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 13 hv9921/hv9922/hv9923 3-lead to-243aa (sot-89) package outline (n8) symbol a b b1 c d d1 e e1 e e1 h l dimensions (mm) min 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.00 ? 1.50 bsc 3.00 bsc 3.94 0.73 ? n o m-------- -- max 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 4.25 1.20 jedec registration to-243, variation aa, issue c, july 1986. ? this dimension differs from the jedec drawing drawings not to scale . b b1 d d1 e h e1 c a 12 3 e e1 top view side view l note: for the most current package drawings, see the microchip packaging specification at www.microchip.com/packaging. note: for the most current package drawings, see the microchip packaging specification at www.microchip.com/packaging. downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 14 ? 2014 microchip technology inc. note: for the most current package drawings, see the microchip packaging specification at www.microchip.com/packaging. downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 15 hv9921/hv9922/hv9923 appendix a: revision history revision a (october 2014) original release of this document. downloaded from: http:///
hv9921/hv9922/hv9923 ds20005311a-page 16 ? 2014 microchip technology inc. the microchip web site microchip provides online support via our www site at www.microchip.com . this web site is used as a means to make files and information easily available to customers. accessible by using your favorite internet browser, the web site contains the following information: product support C data sheets and errata, application notes and sample programs, design resources, users guides and hardware support documents, latest software releases and archived software general technical support C frequently asked questions (faq), technical support requests, online discussion groups, microchip consultant program member listing business of microchip C product selector and ordering guides, latest microchip press releases, listing of seminars and events, listings of microchip sales offices, distributors and factory representatives customer change notification service microchips customer notification service helps keep customers current on microchip products. subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. to register, access the microchip web site at www.microchip.com . under support, click on customer change notification and follow theregistration instructions. customer supportusers of microchip products can receive assistance through several channels: distributor or representative local sales office field application engineer (fae) technical support customers should contact their distributor, representative or field application engineer (fae) for support. local sales offices are also available to help customers. a listing of sales offices and locations is included in the back of this document. technical support is available through the web site at: http://microchip.com/support downloaded from: http:///
? 2014 microchip technology inc. ds20005311a-page 17 hv9921/hv9922/hv9923 product identification system to order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office . device: hv9921 = 3-pin switch-mode led lamp driver ic, 20 ma output current hv9922 = 3-pin switch-mode led lamp driver ic, 50 ma output current hv9923 = 3-pin switch-mode led lamp driver ic, 30 ma output current package: n3 = to-92 n8 = to-243aa (sot-89) environmental g = lead (pb)-free/rohs-compliant package reel: (nothing) = 1000/bag for n3 package, 2000/reel for n8 package examples: a) HV9921N3-G: 20 ma output current, to-92 package, 1000/ bag b) hv9923n8-g: 30 ma output current, to-243aa(sot-89) package, 2000/reel p art no. device x environmental xx package options - x reel - downloaded from: http:///
ds20005311a-page 18 ? 2014 microchip technology inc. information contained in this publication regarding deviceapplications and the like is provided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, includ ing but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchipdevices in life support and/or safety applications is entirely at the buyers risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting from such use. no licenses are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, application maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z-scale are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of microchip technology incorporated in the u.s.a. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2014, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 978-1-63276-708-0 note the following details of the code protection feature on microchip devices: microchip products meet the specification contained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specifications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconductor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona; gresham, oregon and design centers in california and india. the companys quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchips quality system for the design and manufacture of development systems is iso 9001:2000 certified. downloaded from: http:///
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