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features ? low-power, low-voltage operation contactless power supply contactless read/write data transmission radio frequency (rf): 100 khz to 150 khz 264-bit eeprom memory in 8 blocks of 33 bits 224 bits in seven blocks of 32 bits are free for user data block write protection extensive protection against contac tless malprogramming of the eeprom on-chip resonance capacitor (80 or 210 pf mask option) anticollision using an swer-on-request (aor) typical < 50 ms to write and verify a block other options set by eeprom: ? bitrate [bit/s]: rf/8, rf/16, rf/32, rf/40, rf/50, rf /64, rf/100, rf/128 ? modulation: bin, fsk, psk, manchester, biphase ? other: terminator mode, password mode, aor mode 1. description the T5554 is a contactless r/w- id entification ic (idic ? ) for general-purpose applica- tions in the 125 khz range. a single coil, connected to the chip, serves as the ic?s power supply and bidirectional communication interface. the coil and chip together form a transponder. the on-chip 264-bit eeprom (8 blocks 33 bi ts each) can be read and written block- wise from a base station. the blocks can be protected against overwriting. one block is reserved for setting the operation modes of the ic. another block can contain a password to prevent unauthorized writing. reading occurs by damping the coil by an internal load. there are different bitrates and encoding schemes possible. writing occurs by interrupting the rf field in a spe- cial way. 2. system block diagram figure 2-1. rfid system using T5554 tag controller c oil interface memory transponder base station data power controller c oil interface memory transponder base station data T5554 power standard r/w idic (264 bit) with integrated capacitance T5554 4576d?rfid?12/06
2 4576d?rfid?12/06 T5554 2.1 pad layout figure 2-2. pad layout of T5554 3. T5554 building blocks figure 3-1. block diagram 3.1 analog front end (afe) the afe includes all circuits whic h are directly connected to the coil. it generates the ic?s power supply and handles the bidirectional data communica tion with the reader unit. it consists of the following blocks: rectifier to generate a dc supply voltage from the ac coil voltage clock extractor switchable load between coil1/co il2 for data transmission from the ic to the reader unit (read) field gap detector for data transmission from the reader unit into the ic (write) coil 1 coil 2 v dd v ss test pads T5554 coil 1 coil 2 modulator analog front end por input register write decoder bitrate generator memory (264 bit eeprom) controller test logic mode register hv generator v dd v ss test pads
3 4576d?rfid?12/06 T5554 3.2 resonance capacitor the resonance capacitor is integrated on chip. by mask option the value can be 80 pf or 210 pf typically. 3.3 controller the main controller has the following functions: load mode register with configuration data from eeprom block 0 after power-on and also during reading control memory access (read, write) handle write data transmission and the write error modes the first two bits of the write data stream are the op-code. there are two valid op-codes (standard and stop) which are decoded by the controller. in password mode, the 32 bits received after the op-code are compared with the stored password in block 7. 3.4 bitrate generator the bitrate generator can deliver the following bitrates: rf/8 ? rf/16 ? rf/32 ? rf/40 ? rf/50 ? rf/64 ? rf/100 ? rf/128 3.5 write decoder decode the detected gaps during writing. check if write data stream is valid. 3.6 test logic test circuitry allows rapid programming and verification of the ic during test. 3.7 hv generator voltage pump which generates 18v for programming of the eeprom. 3.8 power-on reset (por) the power-on reset is a delay reset which is triggered when supply voltage is applied. 3.9 mode register the mode register stores the mode data from eeprom block 0. it is continually refreshed at the start of every block. this increases the reliabilit y of the device (if the originally loaded mode information is false, it will be corrected by subsequent refresh cycles).
4 4576d?rfid?12/06 T5554 3.10 modulator the modulator consists of several data encoder s in two stages, which may be freely combined to obtain the desired modulation. the basic types of modulation are: psk: phase shift: 1) every change; 2) every ?1?; 3) every rising ed ge (carrier: fc/2, fc/4 or fc/8) fsk: 1) f1 = rf/8 f2 = rf/5; 2) f1 = rf/8, f2 = rf/10 manchester: rising edge = h; falling edge = l biphase: every bit creates a change, a data ?h? creates an additional mid-bit change note: the following modulation type combinations will not work: ? stage1 manchester or bi phase and stage2 psk, at an y psk carrier frequency (because the first stage output frequency is higher than the second stage strobe frequency); ? stage1 manchester or biph ase and stage2 psk with bitrate = rf/8 and psk carrier frequency = rf/8 (for the same reason as above); ? any stage1 option with any psk for bitrates rf/50 or rf/100 if the psk carrier frequency is not an integer multiple of the bitrate (e.g., br = rf/50, pskcf = rf/4, because 50/4 = 12.5). this i s because the psk carrier frequency must maintain constant phase with respect to the bit clock. figure 3-2. modulator block diagram direct manchester biphase psk1 psk2 psk3 direct fsk1, 1a fsk2, 2a from memory to load carrier frequency mux mux
5 4576d?rfid?12/06 T5554 3.11 memory the memory of the T5554 is a 264-bit eeprom, wh ich is arranged in 8 blocks of 33 bits each. all 33 bits of a block, including the lock bi t, are programmed simultaneously. the programming voltage is generated on-chip. block 0 contains the mode data, which are not normally transmitted (see figure 3-3 ). blocks 1 to 6 are freely programmable. block 7 may be used as a password. if password protec- tion is not required, it may be used for user data. bit 0 of every block is the lock bit for that bl ock. once locked, the bl ock (including the lockbit itself) cannot be field-reprogrammed. data from the memory is transmitted serially, starting with block 1, bit 1, up to block ?maxblk?, bit 32. ?maxblk? is a mode parameter set by the user to a value between 0 and 7 (if maxblk = 0, only block 0 will be transmitted). figure 3-3. memory map 1 032 l l l l l l l l block 7 block 6 block 5 block 4 block 3 block 2 block 1 block 0 user data or password 32 bits user data user data user data user data user data user data configuration data not transmitted
6 4576d?rfid?12/06 T5554 figure 3-4. memory map of block 0 01 maxblk 32 reserved 11 25 27 15 [2] [1] [0] ms2 18 20 [2] [1] [0] ms1 16 17 [1] [0] 31 30 29 28 24 23 22 [1] [0] br 12 14 [2] [1] [0] res'd *usestop usebt aor "0" usest send blocks: usepwd key: ----------------------------------- -- aor anwer-on-request bt use block terminator st use sequence terminator pwd use password stop obey stop header (active low!) br bit rate ms1 modulator stage 1 ms2 modulator stage 2 pskcf psk clock frequency maxblk see maxblock feature reserved do not use * bit 15 and 24 must always be at "0", otherwise malfunction will appear. lock bit (never transmitted) pskcf 21 26 19 13 0 0 0 0 0 0 1 1 0 1 0 1 to 2 0 1 1 1 to 3 1 0 0 1 to 4 1 0 1 1 to 5 1 1 0 1 to 6 1 1 1 1 to 7 0 0 rf/2 0 1 rf/4 1 0 rf/8 1 1 reserved 0 0 0 direct 0 0 1 psk1 (phase change when input changes) 0 1 0 psk2 (phase change on bitclk if input high) 0 1 1 psk3 (phase change on rising edge of input) ----------------------------------- o/p freq. data=1 data=0 1 0 0 fsk1 rf/8 rf/5 1 0 1 fsk2 rf/8 rf/10 1 1 0 fsk1a rf/5 rf/8 1 1 1 fsk2a rf/10 rf/8 0 0 direct 0 1 manchester 1 0 biphase 1 1 reserved 0 0 0 rf/8 bitrate_8cpb 0 0 1 rf/16 bitrate_16cpb 0 1 0 rf/32 bitrate_32cpb 0 1 1 rf/40 bitrate_40cpb 1 0 0 rf/50 bitrate_50cpb 1 0 1 rf/64 bitrate_64cpb 1 1 0 rf/100 bitrate_100cpb 1 1 1 rf/128 bitrate_128c p b "0" * *
7 4576d?rfid?12/06 T5554 4. operating the T5554 4.1 general the basic functions of t he T5554 are: supply ic from the co il, read data from the eeprom to the reader, write data into the ic and program these data in to the eeprom. seve ral errors can be detected to protect the memory from being written with the wrong data (see figure 5-4 on page 16 ). 4.2 supply the T5554 is supplied via a tuned inductance (l 8 mh) which is connected to the coil 1 and coil 2 pads. the incoming rf (actually a magnetic field) induces a current into the coil. the on-chip rectifier generates the dc supply voltage (v dd , v ss pads). overvoltage protection pre- vents the ic from damage due to high-field strengths. depending on the coil, the open-circuit voltage across the lc circuit can reach more than 100v. the first occurrence of rf triggers a power-on reset pulse, ensuring a defined start-up state. 4.3 read reading is the default mode after power-on reset. it is done by switching a load between the coil pads on and off. this changes the current through the ic coil, which can be detected from the reader unit. 4.4 start-up the many different modes of the T5554 are activated after the first readout of block 0. the mod- ulation is off while block 0 is read. after this set-up time of 256 field clock periods, modulation with the selected mode starts. any field gap during this initialization will restart the complete sequence. 4.5 read data stream the first block transmitted is block 1. when the la st block is reached, reading restarts with block 1. block 0, which contains mode data, is normally never transmitted. however, the mode register is continuously refreshed with the contents of eeprom block 0. figure 4-1. application circuit T5554 iac 125 khz energy data tuned lc reader coil l~8 mh c res 210 pf
8 4576d?rfid?12/06 T5554 figure 4-2. voltage at coil1/coil2 after power-on figure 4-3. terminators figure 4-4. read data streams and terminators damping on damping off read data with configured modulation and bitrate v coil 1 - coil 2 * fc -> field clocks loading block 0 (256 fc ~ 2 ms) 2 ms power-on reset block sequence bit period last bit first bit last bit first bit data bit '1' data bit '1' data bit '1' waveforms for different modulations manchester fsk psk terminator not suitable for biphase modulation first bit '0' or '1' block terminator sequence terminator v coil 1 - coil 2 block 1 block 2 block 7 block 1 block 2 block 1 block 2 block 7 block 1 block 2 block 1 block 2 block 7 block 1 block 2 block 1 block 2 block 7 block 1 block 2 0 0 0 0 loading block 0 loading block 0 loading block 0 loadin g block 0 block terminator sequence terminator off off st bt on off off on on on
9 4576d?rfid?12/06 T5554 figure 4-5. maxblk examples 4.6 maxblock feature if it is not necessary to read all user data blocks, the maxblk field in block 0 can be used to limit the number of blocks read. for example, if maxblk = 5, the T5554 repea tedly reads and trans- mits only blocks 1 to 5 (see figure 4-5 ). if maxblk is set to ?0?, block 0 (which is normally not transmitted) can be read. 4.7 terminators the terminators are (optionally selectable) special damping patterns, which may be used to syn- chronize the reader. there are two types avai lable; a block terminator which precedes every block, and a sequence terminator which always follows the last block. the sequence terminator consists of two consecutive block terminators. the terminators may be individually enabled with the mode bits st (sequence terminator enable) or bt (block termina- tor enable). note: it is not possible to incl ude a sequence terminator in a transmission where maxblk = 0. 4.8 direct access the direct access command allows the reading of an individual block by sending the op-code (?10?), the lock-bit and the 3-bit address. note: pwd has to be 0. 4.9 modulation and bitrate there are two modulator stages in the T5554 (see figure 3-2 on page 4 ) whose mode can be selected using the appropriate bits in block 0 (ms1[1:0] and ms[2:0]). also the bitrate can be selected using br[2:0] in block 0. these options are described in detail in figure 5-5 on page 17 through figure 5-10 on page 22 . 4.10 answer-on-request mode (aor) when the aor bit is set, the idic does not start modulation after loading configuration block 0. it waits for a valid aor data stream (wake-up command) from the reader before modulation is enabled. the wake-up command cons ists of the op-code (?10?) followi ng by a valid password. the ic will remain active until the rf field is turned off or a stop op-code is received. block 1 block 4 block 5 block 1 block 2 maxblk = 5 maxblk = 2 maxblk = 0 block 1 block 2 block 1 block 2 block 1 block 0 block 0 block 0 block 0 block 0 0 0 0 loading block 0 loading block 0 loading block 0
10 4576d?rfid?12/06 T5554 figure 4-6. answer-on-request (aor) mode table 4-1. T5554 - modes of operation pwd aor stop behavior of tag after reset/por stop function 110 anticollision mode: modulation starts after wake-up with a matching pwd programming needs valid pwd aor allows programing with read protection (no read after write) stop op-code (?11?) defeats modulation until rf field is turned off 100 password mode: modulation starts after reset programming needs valid pwd 010 modulation starts after wake-up command programming with modulation defeat without previous wake-up possible aor allows programing with read protection (no read after write) 000 plain/normal mode: modulation starts after reset direct access command programming without password x 0 1 see corresponding modes above stop op-code ignored, modulation continues until rf field is turned off por loading block 0 no modulation (stop = 0, aor = 1) modulation on v coil 1 - coil 2 op-code ('10') followed by valid password
11 4576d?rfid?12/06 T5554 figure 4-7. anticollision procedure using aor mode enter aor mode power on reset read configuration wait for opcode + pwd (== wake up command) write damping pwd correct ? send block 1...maxblk until stop command internal reset sequence no yes tag init tags with aor = '1', pwd = '1', stop = '0' send stop command "select single tag" send opcode + pwd (== wake up command) decode data all tags read ? exit wait for t w > 2.5 ms no yes base station field off -> on
12 4576d?rfid?12/06 T5554 figure 4-8. signals during writing figure 4-9. write data decoding schemes figure 4-10. T5554 ? op-code formats rf_field gap write data field clock 1 0 start 1 10 damping write mode data clock load on load off >64 fcs = stop write programming read mod e read mode writing modulation during read mode write data decoder 116324864 fail 0 fail 1 writing done op 10 2 addr 0 op 10 11 op password mode aor (wake-up command) standard write stop command op 10 l l 1 data bits 32 1 password 32 1 password 32 op 10 l direct access 2 addr 0 2 addr 0 1 data bits 32
13 4576d?rfid?12/06 T5554 4.11 write writing data into the ic occurs via the atmel write method. it is based on interrupting the rf field with short gaps. the time between two gaps enco des the ?0/1? information to be transmitted. 4.12 start gap the first gap is the start gap which triggers write mode. in write mode, the damping is perma- nently enabled which eases gap detection. the start gap may need to be longer than subsequent gaps in order to be detected reliably. a start gap will be detected at any time after bl ock 0 has been read (fie ld-on plus approximately 2 ms). figure 4-11. start of writing 4.13 decoder the duration of the gaps is usually 50 to 150 s. the time between two gaps is nominally 24 field clocks for a ?0? and 56 field clocks for a ?1?. when there is no gap for more than 64 field clocks after previous gap, the idic exits write mode; it starts with programming if the correct number of valid bits were received. if there is a gap fail - i.e., one or more of the intervals did represent not a valid ?0? or ?1? - the ic does not program, but enters read mo de beginning with block 1, bit 1. 4.14 writing data into the T5554 the T5554 expects a 2-bit op-code first. there are two valid op-codes (?10? and ?11?). if the op-code is invalid, the T5554 starts read mode beginning with block 1 after the last gap. the op-code (?10?) is followed by different information (see figure 4-11 ): standard writing needs the op-code, the lock bit, the 32 data bits and the 3-bit block address. writing with usepwd set requires a valid password between op-code and address/data bits. in aor mode with usepwd, op-code and a valid password are necessary to enable modulation. the stop op-code is used to silence the t5 554 (disable damping until power is cycled). note: the data bits are read in the same order as written. start of writing rf read mode write mode ( start g a p)
14 4576d?rfid?12/06 T5554 5. stop op-code the stop op-code (?11?) is used to disable the modulation until a power-on reset occurs. this feature can be used to have a steady rf field where single transponders are collected one by one. each ic is read and than disabled, so that it does not interfere with the next ic. note: the stop op-code should contain only the two op-code bits to disable the ic. any additional data sent will not be ignored, and the ic will not stop modulation. figure 5-1. op-code transmission 5.1 password when password mode is on (usepwd = 1), the first 32 bits after the op-code are regarded as the password. they are compared bit-by-bit with the contents of block 7, starting at bit 1. if the comparison fails, the ic will not program the memory, but restart in read mode at block 1 once writing has completed. notes: 1. if pwd is not set, but the ic receives a writ e datastream containing any 32 bits in place of a password, the ic will enter programming mode. 2) in password mode, maxblk should be set to a value below 7 to prevent the password from being transmitted by 3) every transmission of 2 op-code bits, 32 pa ssword bits, one lock bit, 32 data bits and 3 address bits (= 70 bits) needs about 35 ms. testing all 232 possible combinations (about 4.3 billion) takes about 40,000 h, or over four years. this is a sufficient password protection for a general-purpose idic. 5.2 programming when all necessary information has been written to the T5554, programming may proceed. there is a 32-clock delay between the end of writing and the start of programming. during this time, vpp - the eeprom programming voltage - is measur ed and the lock bit for the block to be programmed is examined. furthermore, vpp is continually monitored throughout the program- ming cycle. if at any time vpp is too low, the chip enters read mode immediately. the programming time is 16 ms. after programming is done, the T5554 enters read mode, starting with the block just pro- grammed. if either block or sequence terminator s are enabled, the block is preceded by a block terminator. if the mode register (block 0) ha s been reprogrammed, the new mode will be acti- vated after the just-programmed block has been transmitted using the previous mode. 1 standard op-code stop op-code 0 read mode write mode start gap more data ... > 64 clocks 1 1
15 4576d?rfid?12/06 T5554 figure 5-2. programming figure 5-3. coil voltage after programming of block 0 5.3 error handling several error conditions can be detected to ensure that only valid bits are programmed into the eeprom. there are two error types wh ich lead to di fferent actions. 5.4 errors during writing there are four detectable errors which could occur during writing data into the T5554: wrong number of field clocks between two gaps the op-code is neither the standard op -code (?10?) nor the stop op-code (?11?) password mode is active but the password does not match the contents of block 7 the number of bits received is incorrect; valid bit counts are ? standard write: 38 bits (pwd not set) ? password write: 70 bits (pwd set) ? aor wake-up: 34 bits ? stop command: 2 bits if any of these four conditions are detected, the ic starts read mode immediately after leaving write mode. reading starts with block 1. 16 ms no modulation write mode check v pp hv on modulation operation write vpp/lock ok? program eeprom read 0.12 ms writing done (> 64 clocks since last gap) programming ends reading starts programming starts hv on for testing if vpp is ok (hv at eeproms) 16 ms read programming block read next block programming with updated modes write data into the ic (e.g., new bitrate) (= block 0) v coil 1 - coil 2
16 4576d?rfid?12/06 T5554 5.5 errors during programming if writing was successful, the following errors could prevent programming: the lock bit of the addressed block is set v pp is too low in these cases, programming stops immediately. the ic reverts to read mode, starting with the currently addressed block. figure 5-4. functional diagram of the T5554 power-on reset loading block 0 read op-code password number of bits lock bit write mode ok ok ok ok hv program ok ok addr+1 addr+current stop fail fail fail fail fail fail 11 10
17 4576d?rfid?12/06 T5554 figure 5-5. example of manchester coding with data rate rf/16 rf- field 9 2 1 16 8 1 8 1 8 9 16 16 1 8 9 16 9 2 1 16 8 1 8 9 16 inverted modulator data stream 1 0 0 1 8 fc 8 fc data rate = 1 0 manchester coded 50 field clocks (fc) signal
18 4576d?rfid?12/06 T5554 figure 5-6. example of biphase coding with data rate rf/16 rf- field 9 2 1 16 8 1 8 1 8 9 16 16 1 8 9 16 9 2 1 16 8 1 8 9 16 inverted modulator signal bi phase coded data stream 1 0 0 1 8 fc 8 fc data rate = 1 0 50 field clocks (fc)
19 4576d?rfid?12/06 T5554 figure 5-7. example of fsk coding with data rate rf/40, subcarrier f 0 = rf/8, f 1 = rf/5 data stream 1 0 0 1 data rate = 1 0 rf - field 1 5 1 8 1 8 1 8 5 1 5 inverted modulator signal 40 field clocks (fc) f 0 = rf/8, f 1 = rf/5 1
20 4576d?rfid?12/06 T5554 figure 5-8. example of psk coding with data rate rf/16 data stream 0 0 1 1 0 rf- f ield 2 1 8 9 16 1 8 16 1 8 16 1 8 16 1 8 16 1 8 inverted modulator signal subcarrier rf/2 1 8 fc 8 fc data rate = 16 field clocks (fc)
21 4576d?rfid?12/06 T5554 figure 5-9. example of psk2 coding with data rate rf/16 datas stream 0 0 1 1 0 rf-field 2 1 8 9 16 1 8 16 1 8 16 1 8 16 1 8 16 1 8 inverted modulator signal subcarrier rf/2 1 8 fc 8 fc data rate = 16 field clocks (fc)
22 4576d?rfid?12/06 T5554 figure 5-10. example of psk3 coding with data rate rf/16 data stream 1 0 0 1 8 fc 8 fc data rate = 1 0 rf-field 2 1 8 9 16 1 8 16 1 8 16 1 8 16 1 8 16 1 8 inverted modulator signal sub carrier rf/2 16 field clocks (fc)
23 4576d?rfid?12/06 T5554 figure 5-11. measurement setup for i dd figure 5-12. simplified damping circuit 6. application example figure 6-1. typical application circuit ~ coil 1 coil 2 v dd v ss = 2v i dd v pp coil at 1.5v coil 1 mod coil 2 100 ~ 2 v ~ 2 v 100 T5554 i 125 khz coil 1 (pin 8) coil 2 (pin 1) 2.2 nf to read amplifier input capacitance 25 pf dynamic 8 mh from oscillator energy data ac 740 h c res = 210 pf + 5 pf static,
24 4576d?rfid?12/06 T5554 note: stresses above those listed under ?absolute maximu m ratings? may cause permanent damage to the device. notes: 1. since eeprom performance may be influenced by assembly and packaging, atmel confirms the parameters for dow (= die-on-wafer) and ics assembled in standard package. 2. typical value selected by mask option. 7. absolute maximum ratings stresses beyond 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 these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . parameters symbol value unit maximum dc current into coil 1/coil 2 i coil 10 ma maximum ac current into coil 1/coil 2, f = 125 khz i coil p 20 ma power dissipation (dice) (free-air condition, time of application: 1s) p tot 100 mw electrostatic discharge maximum to mil-standard 883 c method 3015 v max 2kv operating ambient temperature range t amb ?40 to +85 c storage temperature range (data retention reduced) t stg ?40 to +150 c maximum assembly temperature for less than 5 min t sld 150 c 8. electrical characteristics t amb = 25c; f rf = 125 khz, reference terminal is v ss parameters test conditions symbol min. typ. max. unit rf frequency range f rf 100 125 150 khz supply current (see figure 5-11 on page 23 ) read and write over the full temperature range i dd 57.5a supply current (see figure 5-11 on page 23 ) programming over the full temperature range i dd 100 200 a clamp voltage 10 ma current into coil1/2 v cl 9.5 11.5 v programming voltage from on-chip hv-generator v pp 16 20 v programming time t p 18 ms startup time t startup 4ms data retention (1) t retention 10 years programming cycles (1) n cycle 100,000 cycles supply voltage read and write v dd 1.6 v read-mode, t = ?30c v dd 2.0 v coil voltage read and write v coil pp 6.0 v programming, rf field not damped v coil pp 10 v resonance capacitor c res(a) (2) 72 80 88 pf c res(b) (2) 189 210 231 pf damping resistor r d 300 w
25 4576d?rfid?12/06 T5554 10. chip dimensions figure 10-1. chip dimensions of T5554 9. ordering information extended type number package remarks T555401-dbn au-bumped 25 m chip on sticky tape 210 pf capacitor; default programming: all 0; eeprom memory erased T555402-dbn 80 pf capacit or; default progra mming: all 0; eeprom memory erased T555403-dbn niau-bumped 15 m chip on sticky tape 210 pf capacitor; default programming: all 0; eeprom memory erased T555404-dbn 80 pf capacit or; default progra mming: all 0; eeprom memory erased T555401n-ddw 6? wafer 210 pf capacitor; default programming: all 0; eeprom memory erased
26 4576d?rfid?12/06 T5554 11. revision history please note that the following page numbers referred to in this section refer to the specific revision mentioned, not to this document. revision no. history 4576d-rfid-12/06 ? put data sheet in a new template ? features on page 1 changed ? section 3.2 ?resonance capacitor? on page 3 changed ? figure 4-1 ?application circuit? on page 7 changed ? figure 6-1 ?typical application circuit? on page 23 changed ? section 8 ?electrical characteristics? on page 24 changed ? section 9 ?ordering information? on page 25 changed 4576c-rfid-12/05 ? pb-free logo on page 1 deleted
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