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EM MICROELECTRONIC EM4450 EM4550 1 KBit Read/Write Contactless Identification Device

1. Selective RD ADDRESSES Fig 10 wee PAS PEHpcelee Addresses Bit Stream Format XX XK XK XK XK XK KK XK P3 XK KK XK KK XK XX XX XX P2 LW7 LW6 LW5 LW4 LW3 LW2 LW1 LWO P1 FW7 FW6 FW5 FW4 FW3 FW2 FW1 FWO PO PC7 PC6 PC5 PC4 PC3 PC2 PC1 PCO 0 Fig 11 Reset Command The Reset Command will return from any mode to the Standard Read Mode The next word out is the FWR WORD n_ LIW ACK NAK Fig 12 Login The Login command is used to access protected memory areas This command has to be used only once to perform several password protected commands The Power On Reset sequence and the Reset command will reset the password entry and a new Login command has to be received to perform further password protected operations Upon reception of a correct password the EM4450 4550 will respond with an acknowledge pattern ACK and then continue in Standard Read Mode If the Login is correct then password protected operations are allowed If the password is incorrect a NAK pattern is issued and password protected operations will not be possible refer to Write Word for password data structure WORD n_s LIW ACK NAK PASSWORD Fig 13 Copyright 2003 EM Microelectronic Marin SA T7 www emmicroelectronic com EM4450 EM4550 If bit 16 of th
2. RECEIVE MODE Signal on Transponder coil Signal on READ MODE Transceiver coil Signal on Transceiver coil Signal on Transponder coil x RF Carrier RF Carrier Copyright 2003 EM Microelectronic Marin SA 2 Fig 3 www emmicroelectronic com EM4450 EM4550 Absolute Maximum Ratings induced on COIL1 and COIL2 Power Supply Vpp 0 3 to 3 5 V Maximum Voltage other pads Vmax Vppt0 3V Minimum Voltage other pads Vmin Vss 0 3V Electrostatic discharge maximum V to MIL STD 883C method z 3015 2000V Stresses above these listed maximum ratings may cause permanent damages to the device Exposure beyond specified operating conditions may affect device reliability or cause malfunction Handling Procedures This device has built in protection against high static voltages or electric fields however anti static precautions must be taken as for any other CMOS component Unless otherwise specified proper operation can only occur when all terminal voltages are kept within the voltage range Unused inputs must always be tied to a defined logic voltage level Operating Conditions Parameter___ Symbol Min Max Unit Operating Temperature 40 85 Maximum coil current Ilcon 10 mA AC Voltage on Coil Vooi note 1
3. e O A COMPANY OF THE SWATCH GROUP ws EM MICROELECTRONIC MARIN SA EM4450 EM4550 1 KBit Read Write Contactless Identification Device Description The EM4450 4550 is a CMOS integrated circuit intended for use in electronic Read Write RF Transponders The difference between EM4450 and EM4550 is that EM4550 are bumped and has megapads for the two coils The chip contains 1 KBit of EEPROM which can be configured by the user allowing a write inhibited area a read protected area and a read area output continuously at power on The memory can be secured by using the 32 bit password for all write and read protected operations The password can be updated but never read The fixed code serial number and device identification are laser programmed making every chip unique The EM4450 4550 will transmit data to the transceiver by modulating the amplitude of the electromagnetic field and receive data and commands in a similar way Simple commands will enable to write EEPROM to update the password to read a specific memory area and to reset the logic The coil of the tuned circuit is the only external component required all remaining functions are integrated in the chip Typical Operating Configuration EM4450 Typical value of inductance at 125 kHz is 9 6 mH Fig 1 Copyright 2003 EM Microelectronic Marin SA Features 1 KBit of EEPROM organized in 32 words of 32 bits 32 bit Device Serial Number Read Only
4. 1 bit the transceiver continues to send clocks without modulation After half a bit period the modulation device of the EM4450 4550 is turned OFF allowing recharge of the internal supply capacitor To send a logic 0 bit the transceiver stops sending clocks 100 modulation during the first half of a bit period The transceiver must not turn OFF the field after 7 4 clocks of the bit period Opt64 Opt32 The field is stopped for the remaining first half of the bit period and then turned ON again for the second half of the bit period The 32rd 16th clock Opt64 Opt32 defines the end of the bit To ensure synchronisation between the transceiver and the transponder a logic bit set to 0 has to be transmitted at regular intervals The RM pattern consists of two bits set to 0 thus allowing initial synchronisation In addition the chosen data structure contains even parity bits which will not allow more than eight consecutive bits set to logic 1 where no modulation occurs Copyright 2003 EM Microelectronic Marin SA 11 www emmicroelectronic com EM4450 EM4550 While the transceiver is sending data to the transponder two different modulations will be observed on both coils During the first half of the bit period the EM4450 4550 is switching ON its modulation device causing a modulation of the RF field This modulation can also be observed on the transceiver s coil The transceiver sending a bit 0 will switch OFF the field caus
5. 8 VSS Negative Internal Supply Voltage 9 coIL2 Coil Terminal 2 Copyright 2003 EM Microelectronic Marin SA 14 www emmicroelectronic com EM4450 EM4550 Ordering Information Die Form This chart shows general offering for detailed Part Number to order please see the table Standard Versions below EM4450 A6 WS 11 Customer Version only for custom specific version Circuit Nb EM4450 standard pads EM4550 mega pads Bumping Version A6 Manchester 64 clocks per bit A5 Manchester 32 clocks per bit blank no bumps EM4450 only E with Gold Bumps EM4550 only Die form Thickness WW Wafer 6 6 mils 152um WS Sawn Wafer Frame 7 7 mils 178um WT Sticky Tape 11 11 mils 280um 27 27 mils 686um Packaged Devices This chart shows general offering for detailed Part Number to order please see the table Standard Versions below EM4450 A6 CI2LC Customer Version only for custom specific version Circuit Nb EM4450 standard pads Version A6 Manchester 64 clocks per bit A5 Manchester 32 clocks per bit Package Card amp Delivery Form CI2LB CID Pack 2 long pins 2 5mm in tape CI2LC CID Pack 2 long pins 2 5mm in bulk CB2RC PCB Package 2 pins in bulk Remarks e For ordering please use table of Standard Version table below e For specifications of Delivery Form including gold bumps tape
6. Laser ROM 32 bit Device Identification Read Only Laser ROM Power On Reset sequence Power Check for EEPROM write operation User defined Read Memory Area at Power On User defined Write Inhibited Memory Area User defined Read Protected Memory Area Data Transmission performed by Amplitude Modulation Two Data Rate Options 2 KBd Opt64 or 4 KBd Opt32 Bit Period 64 or 32 periods of field frequency 170 pF 2 on chip Resonant Capacitor 40 to 85 C Temperature range 100 to 150 kHz Field Frequency range On chip Rectifier and Voltage Limiter No external supply buffer capacitance needed due to low power consumption Available in chip form for mass production and PCB and CID package for samples Applications Ticketing Automotive Immobilizer with rolling code High Security Hands Free Access Control Industrial automation with portable database Manufacturing automation Prepayment Devices 1 www emmicroelectronic com Block Diagram Modulator Voltage Regulator Pow er Control Clock Extractor Data Extractor Command 2 gt Decoder System Principle Transceiver Data to be sent to transponder Modulator Antenna EM4450 EM4550 Control Logic Fig 2 Transponder Oscillator Driver EM4450 Data Filter amp Decoder Gain Data received from trans ponder Demodulator
7. The internal DC voltage will be clamped to avoid high internal DC voltage in strong RF fields Special Timings The Processing Pause Time tpp Write Access Time twa and EEPROM Write Time twee are timings where the EM4450 4550 is executing internal operations During these pauses the RF field will be influenced RF periods 132 32 Opt64 64 Opt64 3200 Opt64 16 16 Opt32 Opt32 2624 Opt32 bp twa Same modulation During Twa and Twee the signal on the coil is as for a normal bit damped due to a higher current consumption Fig 18 Copyright 2003 EM Microelectronic Marin SA 10 www emmicroelectronic com Communication from Transponder to the Transceiver READ MODE The EM4450 4550 modulates the amplitude of the RF field to transmit data to the transceiver Data are output serially from the EEPROM and Manchester encoded 1 bit 64 periods of RF field Opt64 32 periods of RF field Opt32 32 periods Opt64 16 periods Opt32 Data from EEPROM Coded Data Measured on the COIL Opt64 is the chip option with a bit period corresponding to 64 periods of the RF field Opt32 is the chip option with a bit period corresponding to 32 periods of the RF field Fig 19 The EM4450 4550 uses different patterns to send status information to the transceiver Their structure can not be confused with a bit pattern sequence These patterns are the Listen Window LIW to inform the transceiver that data can be accepted th
8. Vpp Supply Frequency note 1 Maximum voltage is defined by forcing 10mA on Coil1 Coil2 Electrical Characteristics Vop 2 5V Vss 0V feoi 125 kHz Sine wave Veoi 1Vpp Top 25 C unless otherwise specified Symbol ________Gondiitions_ Min Typ Max Unit _ 2 3 Supply Voltage Vpop Minimum EEPROM write V V voltage sai Suppy current write Write mode Vpop 2 8V s A V coiL1 vss amp V coiL2 vss lcoi 100UA 0 50 pee eee Eai Ui vss amp Vicoi2 vss leo 5 MA CO eg Monoflop Tmo fH Hts Resonance Capacitor 166 6 170 173 4 Powercheck level ea o eo ee aa Power On Reset level high Rising Supply aa aeaa Clock extractor input min Minimum Voltage for Clock Extraction RAE Clock extractor input max Vara Max Voltage to detect MORU ANON stop note 2 Based on 1000 hours at 150 C Copyright 2003 EM Microelectronic Marin SA 3 www emmicroelectronic com EM4450 EM4550 Vpop 2 5V Vss OV feo 125 KHZ Sine wave Veo 1Vpp Top 25 C unless otherwise specified All timings are derived from the field frequency and are specified as a number of RF periods Parameter Symbol Conditions Value Unit Option 64 clocksperbit Opt6 amp 4 S S y y O Read Bit Period trab 64 RF periods LIW ACK NACK pattern duration toatt 320 RF periods Read 1 Word Duration traw including LIW 3200 RF periods Processing Pause Time top 64 RF periods Write Access Time twa 64 RF periods Initialization Time tinit
9. and bulk as well as possible other delivery form or packages please contact EM Microelectronic Marin S A Copyright 2003 EM Microelectronic Marin SA 15 www emmicroelectronic com EM4450 EM4550 Standard Versions amp Samples For samples please order exclusively _ an ial hdl ki EM4450 A6 CI2LC Standard CID package 2 pins length 2 5mm EM4450 A6 CB2RC Standard PCB Package 2 pins The versions below are considered standards and should be readily available For other versions or other delivery form please contact EM Microelectronic Marin S A Please make sure to give complete part number when ordering without spaces between characters Package Die Form Delivery Form Bumping EM4450 A6 CB2RC Manchester 64 Standard PCB Package 2 pins bulk EM4550 A6 WS11E Manchester 64 Mega _ Sawn wafer 11 mils with gold bumps EM4550 A6 WT11E Die on sticky tape 11 mils with gold bumps Product Support Check our Web Site under Products RF Identification section Questions can be sent to cid emmicroelectronic com Cycle bit Part Number Bit coding EM Microelectronic Marin SA cannot assume responsibility for use of any circuitry described other than circuitry entirely embodied in an EM Microelectronic Marin SA product EM Microelectronic Marin SA reserves the right to change the circuitry and specifications without notice at any time You are strongly urged to ensure that the information given has not been
10. superseded by a more up to date version EM Microelectronic Marin SA 01 03 Rev B Copyright 2003 EM Microelectronic Marin SA 16 www emmicroelectronic com
11. 2112 RF periods EEPROM write time twee Vpp 3V 3200 RF periods Option 32clocksperbit Opt32 Read Bit Period trab 32 RF periods LIW ACK NACK pattern duration toatt 160 RF periods Read 1 Word Duration traw including LIW 1600 RF periods Processing Pause Time top 32 RF periods Write Access Time twa 32 RF periods Initialization Time tinit 1056 RF periods EEPROM write time twee Vpp 3V 2624 RF periods RF periods represent periods of the carrier frequency emitted by the transceiver unit For example if 125 kHz is used The Read bit period Opt64 would be 1 125 000 64 512 us and the time to read 1 word 1 125 000 3200 25 6 ms The Read bit period Opt32 would be 1 125 000 32 256 us and the time to read 1 word 1 125 000 1600 12 8 ms ATTENTION Due to amplitude modulation of the coil signal the clock extractor may miss clocks or add spurious clocks close to the edges of the RF envelope This desynchronisation will not be larger than 3 clocks per bit and must be taken into account when developing reader software Functional Description General The EM4450 4550 is supplied by means of an electromagnetic field induced on the attached coil The AC voltage is rectified in order to provide a DC internal supply voltage When the DC voltage crosses the Power On level the chip enters the Standard Read Mode and sends data continuously The data to be sent in this mode is user defined by storing the first and last addresses to be outp
12. W and FWR The last written word is not output If a request from the transceiver to return in receive mode RM is generated during the LIW another word can be written in Otherwise the EM4450 4550 will return in the Standard Read Mode Write 1 word output WORD n LIW input WRITE WORD ADDRESS Write severalwords output WORD n input WRITE WORD ADDRESS RM WRITE WORD ADDRESS DATA TRANSCEIVER RF FIELD ON Read After Write function output WORD n LIW Last Written LIW LIW FWR input RM WRITE WORD ADDRESS TRANSCEIVER RF FIELD ON Write not allowed or wrong transmission output WORD n LIW input RM WRITE WORD ADDRESS DATA TRANSCEIVER RF FIELD ON Fig 16 Copyright 2003 EM Microelectronic Marin SA 9 www emmicroelectronic com EM4450 EM4550 Power On Reset POR When the EM4450 4550 with its attached coil enters an electromagnetic field the built in AC DC converter will supply the chip The DC voltage is monitored and a Reset signal is generated to initialise the logic The contents of the Control word and Protection word will be downloaded to enable the functions INIT The Power On Res
13. e Acknowledge ACK indicating proper communication and end of EEPROM write and the No Acknowledge NAK when something is wrong The LIW due to its special structure can be used to synchronize the transceiver during a read operation The LIW is sent before each word and is sent twice before FWR NAK Opt64 Opt32 Opt64 is the chip option with a bit period corresponding to 64 periods of the RF field All numbers represent number of periods of RF field Opt32 is the chip option with a bit period corresponding to 32 periods of the RF field Fig 20 Communication from the Transceiver to the Transponder RECEIVE MODE The EM4450 4550 can be switched to the Receive Mode ONLY DURING A LISTEN WINDOW The Transceiver is synchronized with the incoming data from the transponder and expects a LIW before each word During the phase where the chip has its modulator ON 64 32 periods of RF Opt64 Opt32 the transceiver has to send a bit 0 A certain phase shift in the read path of the transceiver can be accepted due to the fact that when entering Receive Mode the Transceiver becomes the Master At reception of the first 0 the chip immediately stops the LIW sequence and then expects another bit 0 to activate the receive mode Once the EM4450 4550 has received the first bit O the transceiver is imposing the timing for synchronisation The EM4450 4550 turns ON its modulator at the beginning of each frame of a bit period To send a logic
14. e On Off 24 31 Last Word Write Inhibited EEPROM 18 31 User available 31 Password 32 Write Only No Read Access 33 DEVICE IDENTIFICATION Laser On means bit set to logic 1 Device Identification Word amp Off means bit set to logic 0 Serial Number Word Laser Programmed Read only Fig 5 Standard Read Mode After a Power On Reset and upon completion of a command the chip will execute the Standard Read Mode in which it will send data continuously word by word from the memory section defined between the First Word Read FWR and Last Word Read LWR When the last word is output the chip will continue with the first word until the transceiver sends a request If FWR and LWR are the same the same word will be sent repetitively The Listen Window LIW is generated before each word to check if the transceiver is sending data The LIW has a duration of 320 160 opt 32 periods of the RF field FWR and LWR have to be programmed as valid addresses FWR lt LWR and lt 33 The words sent by the EM4450 4550 comprise 32 data bits and parity bits The parity bits are not stored in the EEPROM but generated while the message is sent as described below The parity is even for rows and columns meaning that the total number of 1 s is even including the parity bit Word organisation Words 0 to 33 First bit output Row Even Parity Column Even Partiy Last bit output logic 0 Fig 6 When a word is read protected the ou
15. e control word is disabled Password Check ON OFF the Login is still mandatory to modify the Protection Word the Control Word and the Password but not to write in the EEPROM which is not write inhibited In order to modify a write inhibited word the Protection word has to be modified first The Read protected area always requires the Login to be read If the Write Protection Word is write protected the write protection configuration is locked Write Password When a Write Password command is received the chip next expects information on the actual valid password The chip sends back an ACK pattern if the password is correct Then the chip expects the new password consisting of 32 bits parity bit to be stored in the EEPROM The chip will respond with an ACK pattern for a correct reception of data upon reception of the new password and then will send another acknowledge pattern ACK to announce that the data is stored in the EEPROM The Read after Write function has no effect on this command If the password is wrong or the transmission is faulty the chip will send a NAK pattern return to the Standard Read Mode and the password will remain the same Refer to Write Word for password data structure WRITE PW ACTUAL PW TRANSCEIVER RF FIELD ON Fig 14 Write Word The Write mode allows modification of the EEPROM contents
16. en FWR and LWR To enter Selective Read Mode the Transceiver has to send during LIW a Receive mode pattern RM to turn the EM4450 4550 in Receive Mode Then the Selective Read Mode Command is sent by the transceiver followed by the First and Last addresses to be read The FWR and LWR are then replaced by the new addresses and the chip is operating in the same way as the Standard Read Mode The control word is not modified by this command and the next standard read mode operation will work with original FWR and LWR Selected area is read once and then the chip returns to Standard Read Mode To read words which are Read Protected a Login command has to be sent by the transceiver prior to the Selective Read command The Login command is to be used only once for all subsequent commands requiring a password The Selective Read mode command is followed by a single 32 bit word containing the new first and last addresses Bits 0 to 7 correspond to the First Word Read and bits 8 to 15 correspond to the Last Word Read Bits 16 to 31 have to be sent but are not used in the chip The parities must be sent according to the word organisation as described in fig 7 Note that bit 31 is transmitted first To read the device Identification or the Serial Number the Selective Read Command allows direct access to the Laser programmed words These words can also be addressed in the standard read mode by selecting the addresses accordingly WORD n_s LIW ACK NAK
17. et is also provided in order to make sure that the chip will start issuing correct data Hysteresis is provided to avoid improper operation at the limit level gt EM4450 Active Fig 17 Lock All Lock Memory Area The EM4450 4550 can be converted to a Read Only chip or be configured to Read Write and Read Only Areas by programming the protection word This configuration can be locked by write inhibiting the Write Protection Word Great care should be taken in doing this operation as there is no further possibility to change the Write Protection Word The Control Word can also be protected in the same way thus freezing the operation mode Clock Extractor The Clock extractor will generate a system clock with a frequency corresponding to the frequency of the RF field The system clock is used by a sequencer to generate all internal timings Data Extractor The transceiver generated field will be amplitude modulated to transmit data to the EM4450 4550 The Data extractor demodulates the incoming signal to generate logic levels and decodes the incoming data Modulator The Data Modulator is driven by the serial data output from the memory which is Manchester encoded The modulator will draw a large current from both coil terminals thus amplitude modulating the RF field according to the memory data AC DC Converter and Voltage Limiter The AC DC converter is fully integrated on chip and will extract the power from the incident RF field
18. ing a 100 modulation being observed on the transponder coil Bit Period 4 o Transceiver Coil Transponder Coil Periods of RF field Opt 64 J E 16 16 Periods of RF field Opt 32 va Modulation induced by the Transceiver Recommended 7 4 periods Opt64 Opt32 Minimum 1 period Modulation induced by the Transponder Opt64 is the chip option with a bit period corresponding to 64 priods of the RF field Opt32 is the chip option with a bit period corresponding to 32 priods of the RF field Fig 21 Copyright 2003 EM Microelectronic Marin SA 12 www emmicroelectronic com EM4450 EM4550 Package Information Dimensions of PCB and CID version CID Package PCB Package FRONT VIEW t b J K TOP VIEW SYMBOL A B B 38 40 42 S Fo 60 e 62 e 038 05 062 MARKING g 03 04 05 J 042 044 046 R 04 05 06 Dimensions are in mm Dimensions are in mm Fig 22 Fig 23 Copyright 2003 EM Microelectronic Marin SA 13 www emmicroelectronic com EM4450 EM4550 Chip Dimensions Pad size 86 X 86 Pad size 86 X 86 All dimensions in um Mega pad size 200 X 400 All dimensions in um Fig 24 Fig 25 Pad Description Pad Name Function 1 COIL1 Coil Terminal 1 TEST CLK Test Clock input with pull down 3 TEST_IN Test Input with pull down
19. parity bit and one additional block consisting of 8 column parity bits and 0 as stop bit Refer to fig 7 Address 0 0 A5 A4 A3 A2 A1 AO Padd Note A5 in write mode always 0 First bit received addresses Laser ROM pe Data D31 D30 D29 D28 D27 D26 D25 D24 P3 D23 D22 D21 D20 D19 D18 D17 D16 P2 D15 D14 D13 D12 D02 D01 DOO PO PC7 PC6 PCS PC4 PC3 PC2 PC1 PCO 0 Fig 15 Copyright 2003 EM Microelectronic Marin SA 8 www emmicroelectronic com EM4450 EM4550 After reception of the command the address and the data the EM4450 4550 will check the parity the write protection status the Login status and also if the available power from the RF field is sufficient If all the conditions are satisfied an acknowledge pattern ACK will be issued afterward and the EEPROM writing process will start At the end of programming the chip will send an Acknowledge pattern ACK If at least one of the checks fails the chip will issue a no acknowledge pattern NAK instead of ACK and return to the Standard Read Mode The Transceiver will keep the RF field permanently ON during the whole writing process time The Read After Write function bit 17 of Control word controls the mode of operation following a write operation When ON the latest written word will be read out and output next to the ACK pattern and two Listen Windows LIW LIW even if the word is read protected When OFF the ACK is followed immediately by a LIW LI
20. tput will consist of 45 bits set to logic 0 The password has to be used to output correctly a read protected memory area Copyright 2003 EM Microelectronic Marin SA 5 www emmicroelectronic com EM4450 EM4550 Read Sequence POR INIT ze oureuTL Juhu ewr few wre DO D7 Po D8 D15 D16 D23 D24 D31 PC0 PC7 ro 1 bit 64 TO periods Opt64 32 TO periods Opt32 TO periods Opt64 Data Coded Data TO Period of RF carrier frequency Fig 7 Receive Mode To activate the Receive Mode the Transceiver sends to the chip the RM pattern while in the modulated phase of a Listen Window LIW The EM4450 4550 will stop sending data upon reception of a valid RM The chip then expects a command The RM pattern consists of 2 bits 0 sent by the transceiver The first bit 0 transmitted is to be detected during the 64 32 opt 32 periods where the modulation is ON in LIW output woon w input COMMAND Fig 8 Commands The commands are composed of nine bits eight data bits and one even parity bit total amount of ones is even including the parity bit COM M AND BITS FUNCTION 00000001 LOGIN 00010001 WRITE PASSWORD 00010010 WRITE WORD 00001010 SELECTIV E READ MODE 10000000 RESET First bit Received Parity bit Fig 9 Copyright 2003 EM Microelectronic Marin SA 6 www emmicroelectronic com EM4450 EM4550 The Selective Read Mode is used to read other data than that defined betwe
21. ut When the last address is sent the chip will continue with the first address until the transceiver sends a request In the read mode a Listen Window LIW is generated before each word During this time the EM4450 4550 will turn to the Receive Mode RM if it receives a valid RM pattern The chip then expects a valid command Mode of Operation Pow er On Standard Get Command Read Mode Execute Command Receive sie request Write Word Write Password Selective Read Fig 4 Copyright 2003 EM Microelectronic Marin SA 4 www emmicroelectronic com EM4450 EM4550 Memory Organisation The 1024 bit EEPROM is organised in 32 words of 32 bits The first three words are assigned to the Password the Protection word and the Control word In order to write one of these three words it is necessary to send the valid password At fabrication the EM4450 4550 comes with all bits of the password programmed to a logic 0 The Password cannot be read out The memory contains two extra words of Laser ROM These words are laser programmed during fabrication for every chip are unique and cannot be altered Memory Map BitQ Bit 31 Word 0 Control Word Protection Word 1 PROTECTION WORD EE 0 7 First Word Read 0 7 First Word Read Protected CONTROL WORD EE 8 15 Last Word Read 8 15 Last Word Read Protected 3 EE 16 Password Check On Off 16 23 First Word Write Inhibited 928 Bits of USER 17 Read After Writ
22. word by word To modify address 1 Protection word and address 2 Control word it is mandatory to first send a Login command in order to Log in like in a computer The new written values will take effect only after performing a Reset command It is strongly recommended to check the result of modifying the contents of these addresses effecting the function of the chip Address 0 Password cannot be modified with this command but can be changed with the Write Password command Addresses 3 to 31 are programmable according to the defined protections If the Password Check bit is off bit 16 of control word and the word is not write inhibited the selected word can be freely modified without password If the Password Check bit is on and the word is not write inhibited the selected word can be modified with a previous Login In any case if the word is write inhibited the protection word has to be changed before programming can occur bit 16 Control word Protection word gp pg ee command A2 OFF __ Login always required 2 Write configuration LOCKED Login required Change protection word first The Write Word command is followed by the address and data The address consists of a 9 bit block containing 8 data bits and 1 even parity bit Only 6 bits from the data section are used for the word addressing and the first three bits sent must be 0 The data consists of 4 times 9 bit blocks each block consisting of 8 data bits and 1 associated even

EM MICROELECTRONIC EM4450 EM4550 1 KBit Read/Write Contactless Identification Device

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