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9334b-rfid-05/14 features read/write anti-collision id transponder in plastic package contactless read/write data transmission inductive coupled power supply at 125khz basic component: r/w atmel ? idic ? e5551 anti-collision mode by password request e.g. 10 transponders read out in < 500ms (rf/32, maxblock 2) depending on the application built-in coil and capacitor for circuit antenna starts with cyclical data read out 224-bit eeprom user progr ammable in 32-bit blocks typically < 50ms to write and verify a block write protection by lock bits malprogramming protection options set by eeprom bit rate [bit/s]: rf/8, rf/16, rf/32, rf/40, rf/50, rf/64, rf/100, rf/128 modulation: bin, fsk, psk, manchester, bi-phase application access control systems brand protection process control and automation systems installation and medical equipment asset management systems industrial ata5551m-ppmy standard read/write id tr ansponder with anti-collision datasheet
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 2 1. description the atmel ? ata5551m-ppmy is a completely programmable r/w tran sponder which implements al l important functions for identification systems, including anti-collision (e.g., 10 trans ponders in < 500ms depending on the application). it allows the contactless reading and writing of data which are transmitted bi-directionally between a read/write base station and the transponder. it is a plastic-packaged device which accommodat es the idic e5551 and also the antenna realized as an lc- circuit. no additional external power supply is necessary fo r the transponder because it receives power from the rf field generated by the base station. data are transmitted by modulating the amplitude of the rf field. the atmel ata5551m- ppmy can be used to adjust and m odify the id code or an y other stored data, e. g., rolling code systems. the on-chi p 264-bit eeprom (8 blocks, 33 bits per block) can be read and written block wise from the base station. the bl ocks can be protected against overwriting. one block is reserved for setting the operat ion modes of the ic. another block can obtain a password to prevent unauthorized writing. figure 1-1. system block diagram 2. general the transponder is the mobile part of t he closed coupled identification system (see figure 4-1 on page 3 ), whereas the reader (writer) is based on an ic or on discrete solutions , and the read/write transponder is based on the atmel idic e5551. the transponder is a plastic cube devic e consisting of the following parts: the transponder antenna, rea lized as a tuned lc circuit read/write atmel id ic (e5551) with eeprom 3. transponder antenna the antenna consists of a coil and a capacitor for tuning the ci rcuit to the nominal carrier fr equency of 125khz. the coil has a ferrite core for improving the distance of read, write and programming operations.
3 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 4. read/write idic e5551 the read/write atmel idic e5551 is part of the transponder atmel ata5551m-ppmy. the data are transmitted bidirectionally between the base station and the transponder. the transponder receives power via a single coil from the rf signal generated by the base station. the single coil is connected to the chip and also serves as the ic?s bi-directional communication interface. data are transmitted by modulating the amplitude of the rf sig nal. reading of register contents occurs by damping the coil by an internal load. writing into registers occurs by interr upting the rf field in a specific way. the atmel ata5551m-ppmy transponder operates at a nominal frequency of 125khz. there are different bit rates and encoding schemes. the on-chip 264-bit eeprom (8 block, 33 bi ts each) can be read and wr itten block wise from the base station. the blocks can be protected against overwriting by us ing lock bits. one block is reserved for setting the operation modes of the ic. another block contains a password to prevent unauthorized writing. 4.1 features low-power, low-voltage operation contactless power supply contactless read/write data transmission radio frequency (rf): 100khz to 150khz 264 bit eeprom memory in 8 blocks of 33 bits 224 bits in 7 blocks of 32 bits are free for user data block write protection extensive protection against contac tless malprogramming of the eeprom anticollision using answer-on-request (aor) typical < 50ms 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, bi-phase other: terminator mode, password mode figure 4-1. rfid system using e5551 tag data reader/ writer e5551 power transponder coil interface controller memory
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 4 4.2 atmel e5551 building blocks 4.2.1 analog front end (afe) the afe includes all circuits which are directly connected to the coil. it generates the ic?s power supply and handles the bidirectional data communication 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/ coil2 for data trans mission from the ic to the reader unit (read) field gap detector for data transmission from the reader unit into the ic (write) 4.2.2 controller the main controller has following functions: load mode register with conf iguration data from eeprom block 0 after power-on and also during reading control memory a ccess (read, write) handle write data transmission and the write error modes the first two bits of the write data stream are the opc ode. there are two valid op-codes (standard and stop) which are decoded by the controller. in password mode, the 32 bits received after the opc ode are compared with the stored password in block 7. 4.2.3 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 4.2.4 write decoder decode the detected gaps during writing. check if write data stream is valid. 4.2.5 test logic test circuitry allows rapid programming and verification of the ic during test. 4.2.6 hv generator voltage pump which generates 18v for programming of the eeprom. 4.2.7 pad layout figure 4-2. pad layout coil1 test pads coil2 e5551 v dd v ss
5 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-3. block diagram atmel e5551 4.2.8 power-on reset (por) the power-on reset is a delay reset which is triggered when supply voltage is applied. 4.2.9 mode register the mode register stores the mode data from eeprom block 0. it is continually refres hed at the start of every block. this increases the reliability of the device (if the originally loaded mode information is false, it will be corrected by subsequent refresh cycles). 4.2.10 modulator the modulator consists of several data encoders in two stag es, 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 edge (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 biphase, stage2 psk2, at any psk carrier frequency (because the first stage output frequency is higher than the second stage strobe frequency) stage1 manchester or biphas e and stage2 psk with bi trate = rf/8 and psk carrier fr equency = 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 is because the psk carrier frequency must maintain constant phase with respect to the bit clock. write decoder bitrate generator analog frontend test logic v dd hv generator por controller memory input register (264-bit eeprom) mode register modulator v ss test pads coil1 coil2
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 6 4.2.11 memory the memory of the atmel ? e5551 is a 264 bit eeprom, which is arranged in 8 blocks of 33 bi ts each. all 33 bits of a block, including the lock bit, are programmed simultaneous ly. the programming voltage is generated on-chip. block 0 contains the mode data, whic h are not normally transmitted (see figure 4-5 ). block 1 to 6 are freely programmable. block 7 may be used as a password. if password protecti on is not required, it may be used for user data. bit 0 of every block is the lock bit for that block. once locked, the block (including the lockbit itself) cannot be field- reprogrammed. data from the memory is transmitted serial ly, starting with block 1, bi t 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 4-4. memory map figure 4-5. modulator block diagram l 01 32 user data or password user data user data user data user data user data user data configuration data 32 bits l l l l l l l block 7 block 6 block 5 block 4 block 3 block 2 block 1 block 0 not transmitted manchester mux mux from memory carrier frequency to load direct direct fsk1, 1a fsk2, 2a psk2 psk1 psk3 biphase
7 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-6. memory map of block 0 01 11 13 [2] [1] br reserved ms1 ms2 pskcf maxblk [0] 0 lock bit (never transmitted) 0 [2] * * [1] [0] resd *usestop usebt usest aor usepwd send blocks: [1] [0] [2] [1] [0] [1] [0] 14 15 16 17 21 22 23 24 12 19 20 18 26 27 28 29 30 31 32 25 0000 0011 0 1 0 1 to 2 0 1 1 1 to 3 1 0 0 1 to 4 00rf/2 01rf/4 10rf/8 1 1 reserved 000 001 010 011 direct psk1 (phase change when input changes) psk2 (phase change on bit clk if input high) psk3 (phase change on rising edge of input) 100 101 110 11 aor key: anwer-on-request bt use block 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 * bit 15 and 24 must always be at 0, otherwise malfunction appear. do not use 1 1 0 direct 0 1 manchester 1 0 biphase 1 1 reserved fsk1 o/p freq. fsk2 fsk1a fsk2 rf/8 rf/8 rf/5 rf/10 000 001 010 011 rf/8 rf/16 rf/32 rf/40 bitrate_8cpb bitrate_16cpb bitrate_32cpb bitrate_40cpb 100 101 110 111 rf/50 rf/64 rf/100 rf/128 bitrate_50cpb bitrate_64cpb bitrate_100cpb bitrate_128cpb rf/5 data = 1 data = 0 rf/10 rf/8 rf/8 1 0 1 1 to 5 1 1 0 1 to 6 1 1 1 1 to 7
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 8 4.3 operating the atmel e5551 4.3.1 general the basic functions of the atmel ? e5551 are: supply ic from the coil, read data from the eeprom to the reader, write data into the ic and program these data into the eeprom. several e rrors can be detected to pr otect the memory from being written with the wrong data (see figure 4-21 on page 15 ). 4.3.2 supply the atmel e5551 is supplied via a tuned lc circuit 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 (vdd, vss pads). overvoltage protection prevents th e ic from damage due to high-field st rengths. 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. 4.3.3 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, wh ich can be detected from the reader unit. 4.3.4 start-up the many different modes of the atmel e5551 are activated afte r the first readout of block 0. the modulation is off while block 0 is read. after this set-up time of 256 field clock pe riods, modulation with the selected mode starts. any field gap during this initialization will restart the complete sequence. 4.3.5 read datastream the first block transmitted is block 1. when the last block is reached, reading restarts with block 1. block 0, which contains mode data, is normally never transmitted. however, the mode register is contin uously refreshed with the contents of eeprom block 0. figure 4-7. application circuit figure 4-8. voltage at coil1/coil2 after power-on tuned lc reader coil energy iac 125khz data e5551 2ms * fc field clocks power-on reset loading block 0 (256 fc 2ms) read data with configured modulation and bitrate damping on v coil 1 - coil2 damping off
9 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-9. terminators figure 4-10. read data streams and terminators figure 4-11. maxblk examples data bit 1 sequence terminator last bit terminator not suitable for biphase modulation first bit data bit 1 data bit 1 block terminator bit period last bit first bit first bit 0 or 1 manchester fsk sequence block waveform for different modulations fsk v coil 1 - coil2 off off 0 block 1 block 1 loading block 0 loading block 0 loading block 0 loading block 0 block 2 block 2 block 7 sequence terminator on off off on 0 block 1 block 1 block 2 block 2 block 7 0 block 1 block 1 block 2 block 2 block 7 on on 0 block 1 block 1 block 2 block 2 block 7 st bt block terminator block 5 block 1 block 2 loading block 0 loading block 0 loading block 0 0 block 1 block 4 block 1 block 2 block 1 0 block 1 block 2 block 0 block 0 block 0 0 maxblk = 5 maxblk = 2 maxblk = 0 block 0 block 0
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 10 4.3.6 maxblock feature if it is not necessary to read all user data blocks; the maxbl k field in block 0 can be used to limit the number of blocks read . for example, if maxblk = 5, the atmel ? e5551 repeatedly reads and transmits only blocks 1 to 5 (see figure 4-10 on page 9 ). if maxblk is set to ?0?, block 0 ? wh ich is normally not transmitted ? can be read. 4.3.7 terminators the terminators are (optionally selectable) special damping pa tterns, which may be used to synchronize the reader. there are two types available; a block terminator which precedes ev ery block, and a sequence terminator which always follows the last block. the sequence terminator consists of tw o consecutive block terminators. the terminators may be individually enabled with the mode bits st (sequence terminator enable) or bt (block terminator enable). note: it is not possible to include a sequence terminator in a transmission where maxblk = 0. 4.3.8 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. 4.3.9 modulation and bitrate there are two modulator stages in the atmel e5551 (see figure 4-3 on page 5 ) 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 4-23 on page 17 through figure 4-26 on page 20 . 4.3.10 anticollision mode when the aor bit is set, the ic does not start modulation afte r loading configuration block 0. it waits for a valid aor data stream (wake-up command) from the r eader before modulation is enabled. the wake-up command consists of the op-code (?10?) following by a valid password. the ic will remain active until the rf field is turned off or a stop op-code is received. table 4-1. atmel e5551 - modes of operation pwd aor stop behavior of tag after reset/por stop function 1 1 0 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 1 0 0 password mode: modulation starts after reset programming needs valid pwd 0 1 0 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) 0 0 0 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
11 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-12. answer-on-request (aor) mode figure 4-13. anticollision procedure loading block 0 op-code (10) followed by valid password no modulation (stop = 0, aor = 1) v coil 1 - coil2 modulation on por select single tag send opcode + pwd (== wake up command) initialize tags with aor = 1, pwd = 1 stop 0 power on reset read configuration pwd correct ? tag base station decode data no no yes yes send stop command enter aor mode internal reset sequence send block 1 to maxblk until stop command write damping field off on wait for t w > 2.5 ms wait for opcode + pwd (== wake up command) all tags read ? exit
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 12 4.3.11 writing data into the atmel ata5551m-ppmy 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 encodes the ?0/1? information to be transmitted. the write sequence of the atmel ? ata5551m-ppmy is shown below. writin g data into the transponder occurs by interrupting the rf field with short gaps. after the start gap the standard write op code (10) is followed by the lock bit. the next 32 bits contain the actual data. the la st three bits denote the destination block address. if the correct number of bits have been received, the actual data is programmed into the specified memory block. figure 4-14. write protocol figure 4-15. signals during writing the time elapsing between two detected gaps is used to encod e the information. as soon as a gap is detected, a counter starts counting the number of field clock cycles until the nex t gap is detected. depending on how many field clocks elapse, the data is regarded as ?0? or ?1?. the requ ired number of fiel d clocks is shown in figure 4-16 . a valid ?0? is assumed if the number of counted clock periods is between 16 and 32, for a valid ?1? it is 48 or 64 respectively. any other value being detected results in an error, and the device exits write mode and returns to read mode. figure 4-16. write data decoding schemes 10 standard op-code address bits (e.g. block 4) start gap read mode write mode rf field lock bit 32bit 0 100 > 64 clocks 111 00 start load on load off modulation during read mode rf_field write mode write data data clock field clock damping gap read mode writing programming read mode > 64 fcs = stop write 1 write data decoder 16 32 48 64 fail 0 fail 1 writing done
13 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-17. atmel e5551 ? op-code formats 4.3.12 start gap the first gap is the start gap which trigger s write mode. in write mode , the damping is permanently 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 blo ck 0 has been read (field-on plus approximately 2 ms). figure 4-18. start of writing 4.3.13 decoder the duration of the gap s is usually 50 to 150s. the time between two gaps is nom inally 24 field clocks for a ?0? and 56 field clocks for a ?1?. when there is no gap for more than 64 field clo cks after previous gap, the idic exits write mode; it starts w ith programming if the correct number of valid bits were received. if there is a gap fail - i.e., on e or more of the intervals did represent not a valid ?0? or ?1? - the ic does not program, but enters read mode beginning with block 1, bit 1. 4.3.14 writing data into the atmel e5551 the atmel ? e5551 expects a two bit op-code first. there are two valid op-codes (?10? and ?11?). if the op-code is invalid, the atmel e5551 starts read mode beginning with block 1 after the last gap. the op-code (?10?) is followed by different information (see figure 4-16 on page 12 ): standard writing needs the op-cod e, 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 e5551 (disable damping until power is cycled). note: the data bits are read in the same order as written. 10 op l 1 2 addr 0 2addr0 32 data bits 10 op l2 addr 0 11 op 10 op 1321 32 data bits l passwort 10 op 132 passwort standard write direct access stop command password mode aor (wake-up command) start of writing (start gap) read mode rf write mode
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 14 4.3.15 stop op-code the stop op-code (?11?) is used to stop 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 di sabled, 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 4-19. op-code transmission 4.3.16 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 compar ison fails, the ic will not program the memor y, but restart in read mode at block 1 once writing has completed. notes: if pwd is not set, but the ic receives a write datastream containing any 32 bits in place of a password, the ic will enter programming mode. in password mode, maxblk should be set to a value below 7 to prevent the password from being transmitted by the atmel ? e5551. every transmission of 2 op-code bits, 32 password bits, one lock bit, 32 data bits and 3 address bits (= 70 bits) needs about 35 ms. testing all 2 32 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. figure 4-20. programming 1 start gap read mode write mode 0 standard op-code stop op-code more data ... 1 1 > 64 clocks 16ms writing done (> 64 clocks since last gap) programming starts (hv at eeproms reading starts hv on for testing if v pp is ok 0.12ms v pp /lock ok? write write mode check v pp operation hv on modulation program eeprom programming ends read
15 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-21. coil voltage after programming of block 0 4.3.17 programming when all necessary information has been written to the atmel ? e5551, programming may proceed. there is a 32-clock delay between the end of writi ng and the start of programming. during this time, vpp - the eeprom programming voltage - is measured and the lock bit for the block to be programmed is ex amined. further, vpp is continually monitored throughout the programming cycle. if at any time vpp is to o low, the chip enters read mode immediately. the programming time is 16 ms. after programming is done, the atmel e5551 enters read mode, st arting with the block just pr ogrammed. if either block or sequence terminators are enabled, the blo ck is preceded by a block terminator. if the mode register (block 0) has been reprogrammed, the new mode will be activated after the just -programmed block has been transmitted using the previous mode. 4.3.18 error handling several error conditio ns can be detected to ensure that only valid bits are pr ogrammed into the eeprom. there are two error types which lead to different actions. 4.3.19 errors during writing there are four detectable errors which could oc cur during writing data into the atmel e5551: 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 leav ing write mode. reading starts with block 1. 16ms write data into the ic programming read programming block (= block 0) read next block with updated modes (e.g., new bitrate) v coil 1 - coil 2
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 16 4.3.20 errors during programming if writing was successful, the followi ng errors could prevent programming: the lock bit of the addressed block is set vpp is too low in these cases, programming stops immediately. the ic revert s to read mode, starting with the currently addressed block. figure 4-22. functional diagram of the atmel e5551 loading block 0 read write mode ok ok 10 11 fail fail fail fail fail fail op-code stop password addr = 1 addr = current number of bits ok lock bit ok hv ok program ok power-on reset
17 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-23. example of manchester coding with data rate rf/16 data rate = 50 field clocks (fc) 110 10 0 8 fc 8 91 16 918 18 16 916 16 16 9 16 8 1 9 8 2 1 8 2 1 8 fc manchester coded inverted modulator signal rf-field data stream
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 18 figure 4-24. example of biphase coding with data rate rf/16 9 16 9 8 16 16 9 16 1 8 1 8 2 1 8 2 1 816 9 1 816 9 1 biphase coded inverted modulator signal rf-field data stream data rate = 50 field clocks (fc) 111 00 0 8 fc 8 fc
19 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-25. example of fsk coding with data rate rf/40, subcarrier 5 15 1 5 18 1 8 1 8 1 inverted modulator signal rf-field f 0 = rf/8 f 1 = rf/5 data stream data rate = 40 field clocks (fc) 110 1 0 0
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 20 figure 4-26. example of psk1 co ding with data rate rf/16 16 9 88 2 11 16 8 1 16 8 1 16 8 1 16 8 1 subcarrier rf/2 inverted modulator signal rf-field data stream data rate = 16 field clocks (fc) 10 0 11 0 8 fc 8 fc
21 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 figure 4-27. example of psk2 co ding with data rate rf/16 16 8 1 16 8 1 16 8 1 16 8 1 16 9 88 2 11 subcarrier rf/2 inverted modulator signal rf-field data stream data rate = 16 field clocks (fc) 10 0 011 8 fc 8 fc
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 22 figure 4-28. example of psk3 co ding with data rate rf/16 16 8181618 16 81 16 81 16 9 8 2 11 subcarrier rf/2 inverted modulator signal rf-field data stream data rate = 16 field clocks (fc) 10 1 0 0 1 8 fc 8 fc
23 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 4.4 operating characteristics e5551 t amb = 25c, f rf = 125khz parameters test conditions symbol min. typ. max. unit programming time t p 18 ms startup time t startup 4 ms data retention (1) t retention 10 years programming cycles (1) n cycle 100,000 note: 1. since eeprom performance may be influenced by assemb ly and packaging, we can confirm the parameters for dow (= die-on-wafer) and ics assembled in standard package. 5. 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 rating conditions for extended periods may affect device reliability parameters symbol value unit operating temperature range t amb ?40 to +85 c storage temperature range t stg ?40 to +125 c assembly temperature t < 5 minutes t ass 170 c magnetic field strength at 125khz h pp 1000 a/m 6. operating characte ristics: transponder t amb = 25c, f = 125khz, unless otherwise specified parameters test conditions symbol min. typ. max. unit type* inductance l 4.0 mh q lc circuit resonance frequency room temperature f r 120 125 130 khz t quality factor q lc 31 q magnetic field strength (h) maximum field strength where tag does not modulate no influence to other tags in the field h pp not 1.5 a/m q min. field strength for modulation h pp 25 18 a/m q min field strength for programming h pp 50 a/m q maximum field strength h pp max 600 a/m q *) type means: t: directly or indirectly tested during production; q: based on initial product design
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 24 7. measurement assembly all measurements are done with commercial rfid reader/writer supplied by ?gis?. figure 7-1. testing application reader type: ts-rw38 plus usb ea antenna type: ts-a50-k1000, circular an tenna, inner diameter 51mm, l = 1.08mh supplier: gis 8. actual behavior of the device the atmel ? ata5551m-ppmy detects a gap if the voltage across th e coils decreases below the threshold value of an internal mos transistor. until then, th e clock pulses are counted. the number given for a valid ?0? or ?1? (see figure 4-16 on page 12 ) refers to the actual clock pulses counted by the dev ice. however, there are always more clock pulses being counted than were applied by the base stat ion. the reason for this is the fact that an rf field cannot be switched off immediately. the coil voltage decreases exponentially. so although the rf field coming from t he base station is switched off, it takes some time until the vo ltage across the coils reaches the threshold value of an internal mos transistor and the device detects the gap. referring to the following diagram (see figure 8-1 ), this means that the device uses the times t 0 internal and t 1 internal . the exact times for t 0 and t 1 are dependent on the applicatio n (e.g., field strength, etc.). measured write-time frames of the idic demo kit software are: t 0 = 50s to 130s t 1 = 270s to 390s t gap = 180s to 400s antennas with a high q-factor require longer times for t gap and shorter time values for t 0 and t 1 . figure 8-1. ideal and re al behavior signals 9. operating distance the maximum distance between the base station and the atmel ata5551m-ppmy depends mainly on the reader station, the coil geometries and the modulation op tions chosen. under laboratory condit ions, a distance of up to 9cm can be reached. when using the atmel rfid demo kit ata2270-ek2, th e typical distances in the range of 0cm to 5cm can be achieved. ata5551m-ppmy external antenna reader 1 ideal behavior rf level reduces to zero immediately actual behavior rf level decreases exponentially 1 1 coil voltage gap detect t 1 t 1 internal t 0 internal t 0 t gap 0 0 coil voltage gap detect 1 t 1 t 0 t gap
25 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 10. ordering information 10.1 available ordering codes ata5551m-ppmy 10.2 configuration on delivery in production the transponder is configured as shown in table 10-1 . all blocks are unlocked. bl ock 0 is the configuration register and is pre-programmed to the atmel default operat ing mode. manchester modulation with a data rate of rf/32. 2 data blocks (block 1 and block 2) are transmitte d. the data setting in all blocks are listed in table 10-1 . table 10-1. configuration on delivery block address value comment configuration block 0 0x e608 8042 manchester rf/32, maxblock 2, disabled stop mode use data block 1 block 1 0x 7eff ffff use data block 2 block 2 0x 7dff ffff use data block 3 block 3 0x 7bff ffff use data block 4 block 4 0x 77ff ffff use data block 5 block 5 0x 6fff ffff use data block 6 block 6 0x 5fff ffff use data block 7 block 7 0x 3fff ffff
ata5551m-ppmy [datasheet] 9334b?rfid?05/14 26 11. package information package drawing contact: packagedrawings@atmel.com gpc drawing no. rev. title 6.549-5041.01-4 1 11/11/13 package: transponder dimensions in mm specifications according to din technical drawings 11.9 0.2 4.9 0.1 4.2 0.1 5.7 0.1 1 0.2x 45 1.2 0.1 3 0.2 7 0.2 7 0.2 7 0.2 7 0.2
27 ata5551m-ppmy [datasheet] 9334b?rfid?05/14 12. revision history please note that the following page numbers re ferred to in this section re fer to the specific revision mentioned, not to this document. revision no. history 9334b-rfid-05/14 ? section 6 ?operating characteristics: transponder? on page 23 updated ? section 7 ?measurement assembly? on page 24 updated
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