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mlx90121 13.56mhz rfid transceiver 3901090121 page 1 of 26 data sheet rev. 009 sept.-2009 features and benefits conforms with iso14443b (1) conforms with iso15693 programmable encoder and decoder low external component count applications portable data terminals access control readers contact-less payment terminals smart label printer (1) ratp / innovatron technology ordering information part no. temperature suffix package code option c ode mlx90121 e (-40c to 85c) fr (ssop20, 209 mils) fsk 1. functional diagram microcontroller mlx90121 serial data interface tx rx impedance matching attenuation resistor analog functions digital functions 2. description the mlx90121 is an iso compliant 13.56mhz rfid transceiver integrated circuit. the main features include user selectable modulation depth in write mode, whereas single sub-carrier, fsk and psk modulations are recognized in the read mode. the receiver is based on a diode envelope detector, followed by an if filter and amplifier. a logarithmic amplifier is used for single sub- carrier detection, ensuring fast and clean data recovery. the limiting output of the log amp is used for fsk and psk recovery. the transmitter uses a built in open drain output transistor, which can provide up to 250 miliwatts of rf power to a 50 ohms load with a 5 volts power supply using the recommended matching network. this is suitable for most short to mid range applications. a simplified antenna and matching network can be used, at the expense of a reduced reading range, for example in hand-held reader applications. the chip is configured with a serial interface. a synchronization signal is available when the majority voting is used. digital part contains fsk (423 / 484khz) and psk (847khz) decoders and a programmable encoder to facilitate data handling with a low cost microcontroller. the encoder can be programmed with 6 different patterns. the chip can also be used as an analog front- end, in direct mode.
mlx90121 13.56mhz rfid transceiver 3901090121 page 2 of 26 data sheet rev. 009 sept.-2009 table of contents features and benefits .............................. ................................................... ...................................... 1 applications....................................... ................................................... .................................................. 1 ordering information............................... ................................................... ....................................... 1 1. functional diagram................................. ................................................... ............................... 1-1 2. description........................................ ................................................... ......................................... 2-1 3. glossary of terms .................................. ................................................... .................................. 3 4. absolute maximum ratings ........................... ................................................... ......................... 3 5. mlx90121 electrical specifications ................. ................................................... .................. 3 6. mlx90121 specific specifications................... ................................................... ....................... 4 7. general description ................................ ................................................... ................................. 6 8. applications information ........................... ................................................... ............................ 7 9. block diagram ...................................... ................................................... ....................................... 8 10. digital interface .................................. ................................................... ...................................... 8 11. operating modes.................................... ................................................... ..................................... 9 11.1. d efinitions ................................................... ................................................... .........................................9 11.2. c onfiguration m ode ................................................... ................................................... ........................9 11.3. c ommunication m odes ................................................... ................................................... ...................10 11.3.1. transmission ....................................... ................................................... ..............................................10 11.3.2. reception.......................................... ................................................... .................................................14 11.4. p ower m odes ................................................... ................................................... ....................................18 11.5. xbuf o utput ................................................... ................................................... ...................................18 12. configuration registers ............................ ................................................... .......................... 19 13. configuration registers: iso configuration examples ............................................ 21 14. standard information regarding manufacturability of melexis products with different soldering processes ................. ................................................... .................... 22 15. esd precautions.................................... ................................................... .................................... 22 16. package information................................ ................................................... .............................. 23 17. disclaimer ......................................... ................................................... ........................................... 25
mlx90121 13.56mhz rfid transceiver 3901090121 page 3 of 26 data sheet rev. 009 sept.-2009 3. glossary of terms rfid radio frequency identification iso international organization for standardization / international electrotechnical commission. ask amplitude shift keying fsk frequency shift keying psk phase shift keying 4. absolute maximum ratings parameter symbol condition min max unit supply voltage (v dd with respect to v ss ) v dd dc 0.3 6 v input voltage on any pin (except tx) v in 0.3 v dd +0.3 v maximum power dissipation (without heat sink) p max 500 mw maximum junction temperature t j +150 oc storage temperature t stor 55 +150 oc exceeding the absolute maximum ratings may cause pe rmanent damage. exposure to absolute-maximum- rated conditions for extended periods may affect de vice reliability. 5. mlx90121 electrical specifications t a = -40 oc to +85 oc, or 0oc to +70 oc according to the version, v dd = 5volts, unless otherwise noted. on board resonator is used. parameter symbol test conditions min typ max units general dc parameters operating supply voltage range v dd v dd with respect to v ss 2.7 5 5.5 v standby current consumption i stb v dd = 5.5 v t a = +85 oc t a = +25 oc 3 0.1 30 10 m a m a idle mode current consumption i dle v dd = 5.5v analog section off v dd = 3v, xbuf output disabled 3 1 5 3 ma ma transmit current i tr 50 ohms load v dd = 3v 80 45 120 70 ma ma
mlx90121 13.56mhz rfid transceiver 3901090121 page 4 of 26 data sheet rev. 009 sept.-2009 6. mlx90121 specific specifications dc operating parameters t a = -40 o c to 85 o c, or 0 o c to +70 o c according to the version, v dd = 5v (unless otherwise specified) parameter symbol test conditions min typ max units transmitter specifications peak voltage applied on drain of output transistor 32 v output transistor power dissipation with heat sink 600 mw output transistor on resistance i d = 50 ma 2 5 w output power for five volts operation see note 1 250 mw amplitude modulation depth adjustment range, in 10% mode, with external resistor connected between rmod pin and ground. see note 1 0 90 % amplitude modulation depth in 10% mode with nominal external resistor (10 w ) see note 1 8 10 14 % minimum depth for 100% ask see note 1 40 db rise time for 100% ask 50 ohms load 5% to 60% 50 ohms load 5% to 90% 0.2 0.3 0.4 1.5 s s fall time for 100% ask 50 ohms load 100% to 5% 0.6 s rise and fall time for 10% modulation depth ( nominal external resistor used) 50 ohms load 0.2 s receiver specifications small signal input impedance (rx) 100 k w input rf voltage range (rx C v ss ) with 4.7k w series external resistor 2 3 v pp receiver sensitivity see note 2 35 45 dbm fsk if filter cut off points 2001400 khz gain, in fsk mode (fm output) 120 db
mlx90121 13.56mhz rfid transceiver 3901090121 page 5 of 26 data sheet rev. 009 sept.-2009 serial link and digital i/o output current drive i ol v ol 0.4 volt 4 ma output voltage low v ol i ol max =4ma 0 0.2 0.4 v output voltage high v oh i oh max =4ma 4.6 4.8 5 v input voltage high v ih 0.7 * v dd v dd + 0.3 v input voltage low v il 0.3 0.3 * v dd v ck pulse t ck 0 level pulse or 1 level pulse 500 ns general setup time t s 60 ns general hold time t h 60 ns pulse time between successive registers writing t mw 5 s crystal oscillator frequency range f xtal iso compliant applications 13.56 mhz startup time t start 2 5 ms xtal series resistance 50 100 w external clock signal specifications see note 3 min sine wave amplitude, ac coupled input on pin xtal2 1 v dd v pp min sine wave amplitude, dc coupled input on pin xtal2 input has to be centered around vdd/2 1 v dd v pp xbuf output specifications xbuf low level (col) 1k load resistor 0.1 v xbuf high level (coh) 1k load resistor 4.8 v rise and fall times (10%90%) 1k load resistor//12 pf 3 ns notes 1. parameter measured using recommended output matc hing network. 2. this parameter is measured using a base band sig nal for all specified modulation modes. the measurement is made at the dout output with the inp ut diode detector bypassed. 3. the external clock symmetry is of paramount impo rtance. it has a direct influence on the transmitte r output power. when using a sine wave as external cl ock input, it must not show visible distortion. in case a square wave is used, its duty cycle has to b e equal to 50%.
mlx90121 13.56mhz rfid transceiver 3901090121 page 6 of 26 data sheet rev. 009 sept.-2009 7. general description power supply the 90121 requires a nominal 3 or 5 volts external power supply. operation is guaranteed between 2.7 and 5.5 volts. the current drain depends on the antenna impedance and the output matching network configuration. care must be taken about the power supply: power supply ripple and noise will severely degrade the overall system performance. transmitter the output transistor is a low ron mosfet. the drain is directly accessible on the tx pin. a recommended application schematic optimized to drive a resistive fifty ohms antenna with a five volts power supply is provided as a part of this specification. a simple resonant circuit or/and a simpler matching network can be connected to the output. in that case, the general performance and harmonic suppression will be reduced. 100 % modulation is achieved by means of gating the square wave drive of the output transistor. a variable modulation depth is obtained by means of switching a resistor in series with the output transistors source connection. an external resistor provides the default modulation depth setting. increasing this external resistor will increase the modulation depth. receiver the receiver input is typically connected to the antenna through an external resistor. the modulation from the tag is then recovered by means of a diode envelope detector. fsk and psk recovery the demodulated input signal is amplified and band pass filtered. the signal is then hard limited by a logarithmic amplifier, and fed to the digital section. psk decoded, fsk decoded or a direct fsk signal can be used for further decoding. majority voting both fsk/psk or ask can use the majority voting function that will filter for noise and jitt er, that will correct distorted signals and will hence improve performance. reference clock and internal oscillator the reference clock may be obtained externally by applying a suitable clock signal to the xtal1 pin. a sine wave centered at vcc/2 or a cmos logic compatible signal is an acceptable external system clock. the built-in reference oscillator wil l work either with a quartz crystal or a ceramic resonator. the nominal system clock frequency is 13.56 mhz. reset defaults and power management after a power on reset has been performed, the device is put in its default configuration. there a re three power modes available. in the transmission mode, the device is fully powered. in the idle mode, only the reference oscillator is running. this allows for a fast start up. in the power down mode, the device internal bias system is completely switched off, offering essentially a zer o state. serial communication interface the communication interface normally uses 6 wires: - ck: serial clock input - din: data input - dout: data output - dsync: synchronization output for dout - mode: configuration or communication selection input - rtb: reception or transmission selection input.
mlx90121 13.56mhz rfid transceiver 3901090121 page 7 of 26 data sheet rev. 009 sept.-2009 8. applications information this schematic has been optimized to drive a fifty ohms resistive antenna, using a five volts power su pply. functional description the transmitter output tx is connected to the suppl y by means of a choke l3. c3 is added to avoid a hi gh dv/dt at the tx output in case of a sudden interrup tion of the current in the choke. c3 is chosen high enough to protect the chip, but low enough to keep the resonance of l3-c3 well above 13.56 mhz. the transmitter signal is coupled with dc blocking capacitor c2 to the antenna matching network, which is a t network made up by l2, cv1 and l1. cv1 allows a proper matching between the 50ohm antenna and the output impedance of the transmitter stage. the receiver part of the chip gets its signal direc tly from the antenna by means of r1. it limits the voltage swing at the rx pin to a level in between the suppl ies. one should take care to properly decouple the power supplies of the chip. especially the vdd1 supply which is used for the transmitter output. any ampli tude noise on that supply is am modulated on the carrier and will hence be perceived as noise by the receiver part. the same holds for any phase noise that gets introduced into the quartz oscillator. for the signal that goes to- and from the microcont roller: one should take care to keep them as far as possible from the analog parts and the quartz oscil lator. to do a first evaluation, it is highly recom mended to use the mlx90121 evaluation board that can be or dered from melexis. the clock for the microcontroll er can also be derived from the xbuf pin. this pin pro vides a 13.56mhz buffered clock or 13.56mhz divided by 2.
mlx90121 13.56mhz rfid transceiver 3901090121 page 8 of 26 data sheet rev. 009 sept.-2009 9. block diagram 10. digital interface the mlx90121 is driven by four signals: mode and rt b pins are used to select the operating mode and din and ck pins are used to configure the chip and to transmit data. the mlx90121 has two signal outputs. dout contains the decoded response of the transponder and dsync is used as a synchronization output by the mi crocontroller. pin name i/o function mode rtb din ck dout dsync i i i i o o 0 = configuration mode, 1 = communication mode 0 = transmission mode, 1 = reception mode data input for transmission or configuration clock and trigger data output from reception or configuration data synchronization clock for transmission or rece ption function summary mode rtb function 0 0 configuration 1 0 transmission 0 1 reserved (*) 1 1 reception (*) the reserved mode is for manufacturing purpose only and should not be applied by the user. pa rx tx 13.56mhz fsk decoder psk decoder am fm majority voting dout programmable encoder din digital rmod xtal xbuf
mlx90121 13.56mhz rfid transceiver 3901090121 page 9 of 26 data sheet rev. 009 sept.-2009 11. operating modes 11.1. definitions there are two main operating modes: mode = 0 : configuration mode mode = 1 : communication mode the configuration mode allows writing in the config uration registers. it will configure all parameters in the transceiver. the communication mode allows communicating with a transponder. different options are available: direct transmission: the transmission protocol is handled by an external microcontroller. hardware transmission: the low level protocol is h andled by an internal programmable encoder. it allows using a low cost microcontroller. direct reception: the reception protocol is handle d by an external microcontroller. hardware reception: fsk/psk decoders and majority voting can be enabled to allow using a low cost microcontroller. 11.2. configuration mode registers addresses for configuration purposes, users have access to 13 eight bit registers, which can be addressed using a 4 bit address. address register name 0 1 2 3 4 5 6 7 8 9 10 11 12 analogconfig powerstate reserved (*) digitalconfig encodersym0 encodersym1 encodersym2 encodersym3 encodersym4 encodersym5 encodertimeref decodertimeref ltc (*) the reserved register is for manufacturing purp ose only and should not be used. write configuration registers first the mode line is asserted low to enable the c onfiguration mode. then data is fed serially into t he chip with the ck and din lines. data on the din lin e is read on the rising edge of ck. the first four bits on din are the register address and the eight followin g bits are the data. address and data fields are wr itten msb (most significant bit) first.
mlx90121 13.56mhz rfid transceiver 3901090121 page 10 of 26 data sheet rev. 009 sept.-2009 mode din ck address data rtb msb msb lsb lsb after sending address and data, the mode line is as serted high and the chip is ready to receive the ne xt register configuration. signal assign mode rtb din ck 0 0 4bit address + 8bit data 12 clock pulses dout dsync x x notes 1. if a register does not contain eight bits, write 0 in the unused bit. 2. when mode is asserted high, the chip is in commu nication mode. if the encoder is disabled (by default), din has to be kept at 1 to avoid any mo dulation on the antenna. 3. in case of successive registers writings, it is mandatory to have mode asserted high for at least t mw = 5 m s in between each access, as shown in the following diagram. mode ck writing 1 writing 2 tmw 11.3. communication modes 11.3.1. transmission 11.3.1.a. analog setup for the transmission, the modulation depth has to b e chosen. this is done by the tmodindex bit of the analogconfig register, which selects the modulation index: 10% or 100%. the modulation index can be further tuned by means of the external rmod resistor.
mlx90121 13.56mhz rfid transceiver 3901090121 page 11 of 26 data sheet rev. 009 sept.-2009 11.3.1.b. direct transmission before analog processing, data transmission can be either direct or pre-processed by means of hardware accelerators. direct transmission can be performed with the following setup: signal assign mode rtb din ck 1 0 data to transmit 0 out dsync x x data has to be transmitted in real time by the micr ocontroller on din input. the modulation is done wh en din is asserted low, so by default din has to be as serted high. if a configuration register has to be written, keep din high when mode is asserted low. i n configuration mode, the field is held without modulation independently of din. 11.3.1.c. hardware encoding transmission this programmable encoder allows predefining six di fferent patterns of 8 bits. the encoder is selected by setting the bit encoderen in the digitalconfig regi ster. symbol setup the six symbols are called encodersym0 to encodersy m5. there is a seventh symbol which is hard- coded to 0xff (11111111). a symbol is built with 8 bits as shown in the follo wing figure. 1 0 1 1 1 1 1 0 symbol code iso examples the iso15693 protocol, mode 1 out of 4, is implemen ted using six symbols as shown in the following table. start of frame (sof), end of frame (eof) and pulses are all encoded using one symbol. iso15693 (1 out of 4) symbol name code sym0 sym1 sym2 sym3 sym4 sym5 pulse1 pulse2 pulse3 pulse4 sof eof 10111111 11101111 11111011 11111110 01111011 11011111
mlx90121 13.56mhz rfid transceiver 3901090121 page 12 of 26 data sheet rev. 009 sept.-2009 the iso15693 protocol, mode 1 out of 256, is implem ented using three symbols. start of frame (sof), end of frame (eof) and pulses encoding result of th e combination of these three symbols. iso15693 (1 out of 256) iso15693 (1 out of 256) symbol code name combination sym0 sym1 sym2 11111111 11110000 00001111 sof eof pulse 1 to 256 sym2+2*sym0+sym1 sym0+sym2 255*sym0+sym1 note the position of the symbol sym1 encodes pulses from 1 to 256. f or example: pulse1 = sym1 + 255*sym0 and pulse45 = 44*sym0 + sym1 + 211*sym0. the iso14443 -b protocol is implemented with only t wo symbols. this allows fast addressing with only one ck pulse. iso14443-b symbol name code sym0 sym1 l h 00000000 11111111 time reference setup the time reference is defined in the encodertimeref register. the time reference contains the value of one bit time. hence time bit time symbol _ * 8 _ = the bit time is defined by the enctimeref parameter . enctimeref is an integer value, it is calculated as follows: 1 39.3 1 _ re - ? ? ?? ? ? ? ?? ? = mhz time bit f enctime enctimeref is coded on 5 bits. this means that bit_ time_max = 9.44 m s and symbol_time_max = 75.52 m s. iso examples norm symbol time bit time enctimeref iso15693 (1 out of 4) iso15693 (1 out of 256) iso14443b 75.52 m s 18.88 m s 9.44 m s 9.44 m s 2.36 m s 1.18 m 0x1f (11111) 0x07 (00111) 0x03 (00011)
mlx90121 13.56mhz rfid transceiver 3901090121 page 13 of 26 data sheet rev. 009 sept.-2009 symbol transmission ck and din inputs are used to transmit symbols. on each rising edge of the ck signal, din is sampled t o encode the address of the corresponding symbol. thi s means that each address of the seven available symbols can be encoded with a maximum of three bits (meaning three ck pulses). to reduce the usage of the microcontroller for fast protocol, sym0 and sym1 can be transmitted with only one bit and, sym2 and sym3 with two bits, as shown in the following t able. symbol first symbol 3 bits are needed to initiate transmission subsequent symbols reduced encoding possible (minimum 1 bit) sym0 sym1 sym2 sym3 sym4 sym5 sym6 (*) 000 001 010 011 100 101 110 0 1 10 11 100 101 110 (*) symbol 6 is hard coded to 0xff (11111111). to initiate a transmission, it is necessary to send the first symbol with three ck pulses to initializ e the communication. on every rising edge of dsync, the f ollowing symbol is sent. to complete the transmission, no more ck pulse should be sent after eof symbol. sym2 sym0 sym3 sym5 sym2 sym0 sym3 sym5 din ck dsync modulation 3 ck pulses are mandatory to start transmission n e x t m o d u l a t i o n d a t a available after the rising edge of dsync no ck pulse to complete the transmission signal assign mode rtb din ck 1 0 symbol to transmit clock dout dsync x symbol synchronization
mlx90121 13.56mhz rfid transceiver 3901090121 page 14 of 26 data sheet rev. 009 sept.-2009 11.3.2. reception 11.3.2.a. analog setup for a proper reception, the analog chain has to be configured according to the following parameters in the analogconfig register: bypassall: it bypasses the analog filters in the a nalog chain. must be enabled for am reception. rsub-carrier: it selects the reception sub-carrier frequency C see table. rsub-carrier sub-carrier 0 1 423 / 484 khz 847 khz iso examples standard bypassall rsub-carrier iso15693single subcarrier iso15693dual subcarrier iso14443b 1 0 0 0 0 1
mlx90121 13.56mhz rfid transceiver 3901090121 page 15 of 26 data sheet rev. 009 sept.-2009 11.3.2.b. direct reception after analog processing, data reception can be eith er direct or pre-processed by hardware accelerators , according to the configuration of the seldout param eter in the digitalconfig register. seldout output hardware iso standard 00 01 10 11 am (direct) fm (direct) fsk (423/484 khz) psk (847 khz) fsk decoder psk decoder iso15693single subcarrier iso15693dual subcarrier iso14443b note the output phase of psk decoder is either normal o r inverted. direct reception is achieved with the following set up. signal assign mode rtb din ck 1 1 1 0 dout dsync received data x 11.3.2.c. reception with majority voting (mv) majority voting allows to: filter noisy signal, compensate for jitter, correct distorted signals. at the beginning of the time slot (mvtime), an up / down counter is reset. when the input signal is asserted high, it is counting up and when the input signal is asserted low, it is counting down. at th e end of time slot, the counter value is checked and the output value is set accordingly (low if counter is negative; high if counter is positive). 0 1 0 1 2 1 2 3 input signal majority voting mv output d1 d2 d1 d2 0 1 0 -1 -2 -3 -2 -3 mvtime majority voting setup the following parameters in the digitalconfig regis ter have to be set when using majority voting. mven: it enables the majority voting function. dectimeref: it defines the duration of the time sl ot (mvtime)
mlx90121 13.56mhz rfid transceiver 3901090121 page 16 of 26 data sheet rev. 009 sept.-2009 1 78.6 1 re - ? ? ?? ? ? ? ?? ? = mhz mvtime f dectime s mvtime m 76. 37 max _ = iso examples norm mvtime dectimeref iso15693 single subcarrier C high baud rate iso15693 dual subcarrier C high baud rate iso15693 single subcarrier C low baud rate iso15693 dual subcarrier C low baud rate iso1444b 18.88 m s (half bit) 18.73 m s (half bit) 37.6 m s (quarter bit) 37.46 m s (quarter bit) 9.44 m s (full bit) 127 126 255 253 63 note for manchester coding, majority voting is on half bit portions only. in addition, the mvmode parameter in the digitalcon fig register allows giving more weight to low input levels. note it is highly recommended to use majority voting fo r all iso standard configurations. mv reception to start a reception with majority voting function, assert ck high at the beginning of the response. t hen take data on every falling edge of dsync. reception is stopped by asserting ck low on the last rising edge of dsync. data output are delayed by dectimere f (see next figure). d0 d1 d2 d3 d0 d1 d2 d3 x ck dsync input signal dout majority voting dout input signal
mlx90121 13.56mhz rfid transceiver 3901090121 page 17 of 26 data sheet rev. 009 sept.-2009 example in iso1569-dual sub-carrier input signal ck dout mv start standard reference for input signal iso15693single subcarrier iso15693dual subcarrier iso14443b rising edge rising edge rising / falling edge data slicer ltc is an internal signal which controls the time c onstant of the comparator. this signal is switched to ensure a proper decoding in ask modes in order to i mprove the reading performances. ltc is controlled according to the following parame ters in the ltc register: ltcen: it enables the ltc circuit. ltcdelay: delay to switch the time constant (see n ext table). - + delay rssi ltc ltcdelay recommended delay for iso standard standard delaytime ltcdelay iso15693single subcarrier 4.72 m s 0x1f
mlx90121 13.56mhz rfid transceiver 3901090121 page 18 of 26 data sheet rev. 009 sept.-2009 example in iso15693-single sub-carrier input signal ck dout mv start ltc ltcdelay 11.4. power modes this chip has three power modes. to select one of t hese modes write the powerstate parameter in the powerstate register . powerstate power mode symbol 00 01 11 low power transmitter on power down i dle i tr i stb power down if the power down mode is selected, the crystal osc illator will be turned off. therefore, it will be i mpossible to write the powerstate register to wake up the chi p. to wake up the chip, it is necessary to send a f alling edge on ck when din is low. during power down mode, keep din high to avoid glitches on ck. mode ck din wake-up powerdown poweron notes after a wake-up, the chip has to be set in transmi tter on or low power mode by updating the powerstate register, after t start . low power the oscillator is still on but all analog circuitry is off. 11.5. buf output the xbuf pin can be used to clock a device or a mic rocontroller. by default the output is enabled with a frequency of 6.78mhz. the frequency can be doubled to 13.56mhz by setting the bit xbufsel. when the output is not used, it is recommended to disable th e clock by setting the bit xbufenb.
mlx90121 13.56mhz rfid transceiver 3901090121 page 19 of 26 data sheet rev. 009 sept.-2009 12. configuration registers the following tables explain the meaning of the bit configurations in the 13 registers. register : analogconfig address : 0 bit default name function 7 6 5 4 3 2 1:0 0 0 0 0 0 0 0 xbufsel xbufenb tmodindex rsubcarrier reserved bypassall reserved xbuf frequency selection (0 = 6.78mhz, 1 = 13.56mhz ) xbuf enable (0= enabled, 1 = disabled) transmission modulation index (0 = 100%, 1= 10%) reception subcarrier (0 = 450k , 1 = 847k) C see n otes do not use C should always be configured at 0 bypass analog chain (0= connected, 1 = bypassed) C see notes do not use should always be configured at 11 notes bypassall demodulation 0 fsk / psk 1 ask rsub-carrier sub-carrier frequency 0 423 / 484 khz 1 847 khz register : powerstate address : 1 bit default name function 7:2 1:0 0 0 reserved powerstate do not use chip power state C see notes notes power state [1:0] mode 0 0 idle (oscillator on) 0 1 transmitter on 1 0 unused 1 1 power down (oscillator off)
mlx90121 13.56mhz rfid transceiver 3901090121 page 20 of 26 data sheet rev. 009 sept.-2009 register : reserved address : 2 bit default name function 7:0 0 reserved do not use register : digitalconfig address : 3 bit default name function 7:6 5 4 3 2:1 0 0 0 0 0 0 0 -- reserved mvmode mven seldout encoderen unused do not use majority voting mode (0 = iso15693 / iso14443b) majority voting enable (0 = disabled, 1 = enabled) reception output selection (see table) hardware encoder enable (0 = disabled, 1 = enabled) notes seldout output 00 01 10 11 am (data): 1 = sub carrier ; 0 = no sub carrier fm (limiter): rough digital signal fsk decoded: 1 when f = 423khz, 0 when f = 484k hz psk decoded register : encodersym address : 4 to 9 bit default name function 7:0 7:0 7:0 7:0 7:0 7:0 0 0 0 0 0 0 encodersym0 encodersym1 encodersym2 encodersym3 encodersym4 encodersym5 encoder symbol 0 encoder symbol 1 encoder symbol 2 encoder symbol 3 encoder symbol 4 encoder symbol 5 notes symbol 6 is hard-coded to 0xff (11111111).
mlx90121 13.56mhz rfid transceiver 3901090121 page 21 of 26 data sheet rev. 009 sept.-2009 register : encodertimeref address : a bit default name function 7:5 4:0 0 0 -- enctimeref unused encoder time reference register : decodertimeref address : b bit default name function 7:0 0 dectimeref decoder time reference register : ltc address : c bit default name function 7:6 5:1 0 0 0 0 -- ltcdelay ltcen unused ltc delay ltc enable (0=disabled, 1 = enabled) 13. configuration registers: iso configuration exam ples norm iso15693 iso14443 address register ask high baud rate 100% modulation fsk high baud rate 10% modulation b type 0 1 2 3 4 5 6 7 8 9 10 11 12 analogconfig powerstate* reserved digitalconfig encodersym0 encodersym1 encodersym2 encodersym3 encodersym4 encodersym5 encodertimeref decodertimeref ltc 47 01 00 09 bf ef fb fe 7b df 1f 7f 3f 63 01 00 0d bf ef fb fe 7b df 1f 7e 00 73 01 00 0f 00 ff 00 00 00 00 03 3f 00 notes all values are in hexadecimal notation. transmitter is switched on.
mlx90121 13.56mhz rfid transceiver 3901090121 page 22 of 26 data sheet rev. 009 sept.-2009 14. standard information regarding manufacturabilit y of melexis products with different soldering processes our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according to following test metho ds: reflow soldering smds (s urface m ount d evices) ipc/jedec j-std-020 moisture/reflow sensitivity classification for nonh ermetic solid state surface mount devices (classification reflow profiles according to table 5-2) eia/jedec jesd22-a113 preconditioning of nonhermetic surface mount device s prior to reliability testing (reflow profiles according to table 2) wave soldering smds (s urface m ount d evices) and thds (t hrough h ole d evices) en60749-20 resistance of plastic- encapsulated smds to combin ed effect of moisture and soldering heat eia/jedec jesd22-b106 and en60749-15 resistance to soldering temperature for through-hol e mounted devices iron soldering thds (t hrough h ole d evices) en60749-15 resistance to soldering temperature for through-hol e mounted devices solderability smds (s urface m ount d evices) and thds (t hrough h ole d evices) eia/jedec jesd22-b102 and en60749-21 solderability for all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature prof ile etc) additional classification and qualificatio n tests have to be agreed upon with melexis. the application of wave soldering for smds is allo wed only after consulting melexis regarding assuran ce of adhesive strength between device and board. melexis is contributing to global environmental con servation by promoting lead free solutions. for more information on qualifications of rohs compliant products (rohs = european directive on t he restriction of the use of certain hazardous substances) please visit the quality page on our website: http://www.melexis.com/quality.asp . 15. esd precautions electronic semiconductor products are sensitive to electro static discharge (esd). always observe electro static discharge control pro cedures whenever handling semiconductor products.
mlx90121 13.56mhz rfid transceiver 3901090121 page 23 of 26 data sheet rev. 009 sept.-2009 16. package information the device is packaged in a 20 pin lead free ssop p ackage. pin # symbol pin type description 1 vdd1 supply transmitter power supply 2 tx analog output transistor drain connection 3 mod analog external resistor to set modulation d epth 4 vss1 supply transmitter section ground 5 xout digout output of crystal resonator 6 xin digin input of crystal resonator and externa l system clock input 7 vss2 supply digital section ground 8 xbuf digout buffered output of crystal oscillato r 9 res1 reserved should be grounded for normal oper ation 10 rtb digin receive/transmit selection 11 dout digout data output 12 vdd2 supply digital section power supply 13 din digin data input for registers or modulatio n 14 mode digin configuration/communication selectio n 15 ck digin serial clock input 16 dsync digout data synchronization output 17 vdd3 supply receiver section power supply 18 res2 reserved should be left unconnected for nor mal operation 19 vss3 supply receiver section ground 1 vdd1 2 tx 3 mod 4 vss1 5 xout 6 xin 7 vss2 8 xbuf 9 res1 10 rtb vss3 19 rx 20 vdd3 17 res2 18 dsync 16 ck 15 mode 14 din 13 vdd2 12 dout 11 20 rx anain receiver input moisture sensitivity level is msl3, according as pe r ipc/jedec j-std-20. the mechanical dimensions of this package are depic ted on the following page.
mlx90121 13.56mhz rfid transceiver 3901090121 page 24 of 26 data sheet rev. 009 sept.-2009
mlx90121 13.56mhz rfid transceiver 3901090121 page 25 of 26 data sheet rev. 009 sept.-2009 17. disclaimer 1) the information included in this documentation i s subject to melexis intellectual and other propert y rights. reproduction of information is permissible only if the information will not be altered and is accompanied by all associated conditions, limitatio ns and notices. 2) any use of the documentation without the prior w ritten consent of melexis other than the one set fo rth in clause 1 is an unfair and deceptive business pra ctice. melexis is not responsible or liable for suc h altered documentation. 3) the information furnished by melexis in this doc umentation is provided as is. except as expressly warranted in any other applicable license agreement , melexis disclaims all warranties either express, implied, statutory or otherwise including but not l imited to the merchantability, fitness for a partic ular purpose, title and non-infringement with regard to the content of this documentation. 4) notwithstanding the fact that melexis endeavors to take care of the concept and content of this documentation, it may include technical or factual inaccuracies or typographical errors. melexis disclaims any responsibility in connection herewith . 5) melexis reserves the right to change the documen tation, the specifications and prices at any time a nd without notice. therefore, prior to designing this product into a system, it is necessary to check wit h melexis for current information. 6) melexis shall not be liable to recipient or any third party for any damages, including but not limi ted to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, spe cial incidental or consequential damages, of any kind, i n connection with or arising out of the furnishing, performance or use of the information in this docum entation. 7) the product described in this documentation is i ntended for use in normal commercial applications. applications requiring operation beyond ranges spec ified in this documentation, unusual environmental requirements, or high reliability app lications, such as military, medical life-support o r life-sustaining equipment are specifically not reco mmended without additional processing by melexis for each application. 8) any supply of products by melexis will be govern ed by the melexis terms of sale, published on www.melexis.com . ? melexis nv. all rights reserved. for the latest version of this document, go to our website at: www.melexis.com or for additional information contact melexis direc t: europe, africa: americas: asia: phone: +32 1367 0495 phone: +1 603 223 2362 phone: +32 1367 0495 e-mail: sales_europe@melexis.com e-mail: sales_usa@melexis.com e-mail: sales_asia@melexis.com

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