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general description the max14882 isolated high-speed can transceiver improves communication and safety by integrating gal - vanic isolation between the can-protocol controller-side (tdx, rxd) of the device and the physical wires of the can network (canh, canl) cable-side/bus-side of the transceiver. isolation improves communication by breaking ground loops and reduces noise where large differences in ground potentials exists between ports. the max14882 provides up to 5000v rms (60s) of galvanic isolation and a continuous working voltage of up to 848v rms , while operating at the maximum high-speed can data rate of 1mbps. the max14882 features additional integrated protection for robust communication. the 25v receiver input common- mode range exceeds the iso 11898 specification requirement of -2v to +7v. additionally, the canh and canl ios are fault tolerant up to 54v and are protected from electrostatic discharge (esd) up to 15kv to gndb on the bus-side, as specified by the human body model (hbm). interfacing with can-protocol controllers is simplified by the wide 3.0v to 5.5v supply voltage range (v dda ) on the controller-side of the device. the supply voltage range for the can bus-side of the device is 4.5v to 5.5v (v ddb ). an integrated transformer driver and ldo can be used, with an external transformer, to generate the isolated supply for v ddb . field installation and troubleshooting are simplified by the polarity select (pol) input. pol swaps the functions of the canh and canl ios, allowing for simple software correction of cross-wired bus cables in the field. the max14882 operates over the -40c to +125c temperature range and is available in a 16-pin wide soic (w soic) package with 8mm of creepage and clearance. applications building automation industrial controls hvac switching gear ordering information appears at end of data sheet. 19-100246; rev 0; 2/18 benefts and features integrated protection for more robust communication ? 5kv rms withstand galvanic isolation (60s) ? 25v common mode range ? 54v fault protection ? 15kv esd (hbm) protection on driver outputs/ receiver inputs high-performance transceiver enables flexible designs ? wide 3.0v to 5.5v supply voltage range for can controller interface ? field bus polarity control (pol) ? integrated transformer driver for power transfer to bus-side ? integrated ldo for powering can bus-side safety regulatory approvals (pending) ? ul1577 (basic insulation) ? cul according to csa bulletin 5a click here for production status of specifc part numbers. simplifed block diagram xfmr driver v dda pol rxd txd gnda gndb canl canh 5 v ldo v ddb v ldo max 14882 td 1 td 2 3 . 3 v max14882 5kv rms isolated can transceiver with integrated transformer driver evaluation kit available
v dda to gnda ........................................................ -0.3v to +6v v ddb to gndb ........................................................ -0.3v to +6v v ldo to gndb ...................................................... -0.3v to +16v td1,td2 to gnda ................................................. -0.3v to +12v txd, pol to gnda ................................................. -0.3v to +6v rxd to gnda ......................................... -0.3v to (v dda + 0.3v) i.c. to gndb .......................................... -0.3v to (v ddb + 0.3v) canh or canl to gndb (continuous) ................. -54v to +54v short-circuit duration (canh to canl) ................... continuous short circuit duration (can_ to gndb or v ddb ) ..... continuous short-circuit duration (rxd to gnda or v dda ) ....... continuous td1, td2 continuous current ........................................... 1.4a continuous power dissipation (t a = +70c) 16-pin w soic (derate 14.1mw/c above +70c) ... 1126.8mw operating temperature range ......................... -40c to +125c junction temperature ...................................................... +150c storage temperature range ............................ -60c to +150c lead temperature (soldering, 10s) ................................ +300c soldering temperature (reflow) ....................................... +260c wide 16-soic package code w16+10 outline number 21-0042 land pattern number 90-0107 thermal resistance, single-layer board: junction to ambient ( ja ) 107 oc/w junction to case ( jc ) 22 oc/w thermal resistance, four-layer board: junction to ambient ( ja ) 71 oc/w junction to case ( jc ) 23 oc/w (v dda = 3.0v to 5.5v, v ddb = 4.5v to 5.5v, pol =gnda, i.c. = gndb, t a = -40c to +125c. typical values are at v dda = 3.3v, v ddb = 5v, gnda = gndb, and t a = +25c, unless otherwise noted. (notes 1, 2) ) parameter symbol conditions min typ max units power controller-side (a-side) voltage supply v dda 3 5.5 v bus-side (b-side) voltage supply v ddb 4.5 5.5 v controller side (a-side) supply current i dda pol = txd = high or low, rxd unconnected, td1/td2 uncon - nected v dda = 5v 4.7 7.7 ma v dda = 3.3v 4.5 7.5 absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . for the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package information electrical characteristics maxim integrated 2 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
(v dda = 3.0v to 5.5v, v ddb = 4.5v to 5.5v, pol =gnda, i.c. = gndb, t a = -40c to +125c. typical values are at v dda = 3.3v, v ddb = 5v, gnda = gndb, and t a = +25c, unless otherwise noted. (notes 1, 2) ) parameter symbol conditions min typ max units bus-side (b-side) supply current i ddb v ddb = 5v txd = gnda, r l = open 9.4 15.5 ma txd = gnda, r l = 60? 52 76 txd = v dda , r l = 60? 8.5 txd = gnda, canh shorted to canl 98 130 txd = v dda , canh shorted to canl 8.5 controller-side (a-side) undervoltage lockout threshold v uvloa v dda rising rxd, txd, pol 1.66 v td1, td2 2.85 controller-side (a-side) uvlo hysteresis v uvloa_hyst v dda falling rxd, txd, pol 50 mv td1, td2 200 bus-side (b-side) under - voltage lockout threshold v uvlob v ddb rising 4.25 v v ddb falling 3.45 transformer driver td1, td2 output resistance r o td1/td2 = low, i td_ = 300ma 0.6 1.5 td1, td2 current limit i lim 4.5v v dda 5.5v 540 785 1300 ma 3.0v v dda 3.6v 485 730 1170 switching frequency f sw 350 450 550 khz duty cycle d 50 % crossover dead time t dead 50 ns ldo ldo supply voltage v ldo (note 3) 4.68 14 v ldo output voltage v ddb 4.5 5 5.5 v ldo current limit 300 ma load regulation v ldo = 6v, i load = 20ma to 40ma 0.19 mv/ma line regulation v ldo = 6v to 9.5v, i load = 20ma 0.12 1.8 mv/v dropout voltage v ldo = 4.68v, i ddb = -120ma 100 180 mv load capacitance nominal value (notes 4, 5) 1 10 f can bus driver dominant output voltage high v can_dh txd = gnda, 50? r l to 65? canh, pol = gnda 2.75 4.5 v canl, pol = v dda 2.75 4.5 dominant output voltage low v can_dl txd = gnda, 50? r l to 65? canh, pol = gnda 0.5 2.25 v canl, pol = v dda 0.5 2.25 dominant output voltage, diferential v od 50? r l 65?, figure 1 r cm = open 1.5 3 v r cm = 1.25k, -17v v cm +17v 1.5 3 r cm = 1.25k, -25v v cm +25v 1.1 3 electrical characteristics (continued) maxim integrated 3 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
(v dda = 3.0v to 5.5v, v ddb = 4.5v to 5.5v, pol =gnda, i.c. = gndb, t a = -40c to +125c. typical values are at v dda = 3.3v, v ddb = 5v, gnda = gndb, and t a = +25c, unless otherwise noted. (notes 1, 2) ) parameter symbol conditions min typ max units canh recessive output voltage v can_hr txd = v dda , no load 2 3 v canl recessive output voltage v can_rl txd = v dda , no load 2 3 v recessive output voltage, diferential txd = v dda r l = 60? -12 +12 mv r l = open -50 +50 high-side short-circuit current i short_h txd = gnda pol = gnda, canh = gndb 50 75 100 ma pol = v dda , canl = gndb 50 75 100 low-side short-circuit current i short_l txd = gnda pol = gnda, canl = v ddb 50 75 100 ma pol = v dda , canh = v ddb 50 75 100 receiver common mode input range canh or canl to gndb, rxd output valid -25 +25 v diferential input voltage (recessive) v id_r |v canh - v canl |, txd = v dda 0.5 v diferential input voltage (dominant) v id_d |v canh - v canl |, txd = v dda 0.9 v diferential input hysteresis 125 mv common-mode input resistance r in txd = v dda , r in = v/i, v = +300mv 10 50 k? diferential input resistance r diff_in txd = v dda, r in = v/i, v = +300mv 20 100 k? input leakage current v ddb = gndb, v canh = v canl = 5v 310 a input capacitance canh or canl to gndb, t a = +25oc (note 4) 14.4 20 pf diferential input capacitance canh to canl, t a = +25c (note 4) 7.2 10 pf logic interface (rxd, txd, pol) input high voltage v ih pol, txd to gnda 0.7 x v dda v input low voltage v il pol, txd to gnda 0.8 v input hysteresis v hys 220 mv output high voltage v oh rxd, i out = -4ma v dda - 0.4 v output low voltage v ol rxd, i out = 4ma 0.4 v input pullup current i pu txd -10 -4.5 -1.5 a input pulldown current i pd pol 1.5 4.5 10 a input capacitance c in 2 pf electrical characteristics (continued) maxim integrated 4 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
(v dda = 3.0v to 5.5v, v ddb = 4.5v to 5.5v, pol =gnda, i.c. = gndb, t a = -40c to +125c. typical values are at v dda = 3.3v, v ddb = 5v, gnda = gndb, and t a = +25c, unless otherwise noted. (notes 1, 2) ) parameter symbol conditions min typ max units protection fault protection range canh, canl to gndb -54 +54 v esd protection (canh and canl to gndb) iec 61000-4-2 air-gap discharge 10 kv iec 61000-4-2 contact discharge 5 human body model (hbm) 15 esd protection (canh and canl to gnda) iec 61000-4-2 contact discharge 3 kv iec 61000-4-2 air gap discharge. 470pf capacitor connected between gnda and gndb 10 esd protection (all other pins) human body model (hbm) 2 kv thermal shutdown t shdn junction temperature rising +160 c thermal shutdown hysteresis t sh_hyst 13 c switching characteristics driver rise time t r r cm is open, r l = 60, c l = 100pf, 10% to 90% of transition on |v canh - v canl |, figure 1 23 ns driver fall time t f r cm is open, r l = 60, c l = 100pf, 90% to 10% of transition on |v canh - v canl |, figure 1 31 ns txd to rxd loop delay t loop dominant to recessive and recessive to dominant, r l = 60, c l = 100pf, c lr = 15pf, figure 2 215 ns txd propagation delay t pdtxd_rd , t pdtxd_dr r cm is open, r l = 60, c l = 100pf, figure 1 recessive to dominant 80 ns dominant to recessive 80 rxd propagation delay t pdrxd_rd , t pdrxd_dr c lr = 15pf, figure 3 recessive to dominant 135 ns dominant to recessive 135 txd dominant timeout t dom (note 6) 1.4 4.8 ms undervoltage threshold detection time to normal operation 120 s insulation characteristics partial discharge voltage v pr method b1 = v iorm x 1.875 (t = 1s, partial discharge < 5pc) 2250 v p maximum repetitive peak isolation voltage v iorm (note 7) 1200 v p maximum working isolation voltage v iowm (note 7) 848 v rms maximum transient isolation voltage v iotm t = 1s 8400 v p maximum withstand isolation voltage v iso t = 60s, f = 60hz (notes 7, 8) 5000 v rms electrical characteristics (continued) maxim integrated 5 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
note 1: all devices 100% production tested at t a = +25c. specifications over temperature are guaranteed by design. specifications marked "gbd" are guaranteed by design and not production tested. note 2: all currents into the device are positive. all currents out of the device are negative. all voltages referenced to their respective ground (gnda or gndb), unless otherwise noted. note 3: the maximum v ldo voltage listed in the electrical characteristics table indicates the voltage capability of the max14882. ambient temperature and power dissipation requirements of a given circuit may limit the allowable maximum v ldo to a lower value during operation. note 4: not production tested. guaranteed by design (gbd) and characterization. note 5: capacitance range for a stable output. values are nominal and allow for normal capacitor tolerance. note 6: the dominant timeout feature releases the bus when txd is held low longer than t dom . can protocol guarantees a maximum of 11 successive dominant bits in any transmission. the minimum data rate allowed by the dominant timeout, then, is 11/t dom (min) note 7: v iorm , v iowm , and v iso are defined by the iec 60747-5-5 standard note 8: product is qualified v iso for 60 seconds. 100% production tested at 120% of v iso for 1 second. (v dda = 3.0v to 5.5v, v ddb = 4.5v to 5.5v, pol =gnda, i.c. = gndb, t a = -40c to +125c. typical values are at v dda = 3.3v, v ddb = 5v, gnda = gndb, and t a = +25c, unless otherwise noted. (notes 1, 2) ) parameter symbol conditions min typ max units maximum surge isolation voltage v iosm basic insulation 10 kv insulation resistance r s t a = +150c, v io = 500v >10 9 barrier capacitance input-to-output cio f = 1mhz 2 pf minimum creepage distance cpg wide soic 8 mm minimum clearance distance clr wide soic 8 mm internal clearance distance through insulation 0.015 mm comparative tracking resistance index cti material group ii (iec 60112) 575 climatic category 40/125/21 pollution degree (din vde 0110, table 1 ) 2 electrical characteristics (continued) maxim integrated 6 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
figure 1. transmitter test circuit and timing diagram figure 2. loop delay timing diagram figure 3. receiver timing diagram test circuits and timing diagrams r l c l v od r cm r cm v cm 0 . 5 v t pdtxd _ rd t pdtxd _ dr 50 % 50 % 0 . 9 v txd v od gnda v dda txd canh canl + - gndb t rise / fall < 3 ns for txd gnda txd canh canl r l c l rxd c lr txd rxd 50 % 50 % t loop 1 t loop 2 gnda v dda gnda v dda gnda t loop = t loop 1 t loop 2 t rise / fall < 3 ns for txd rxd rxd c lr canh canl v id + - v id v dda gnda 0 . 9 v 0 . 5 v t pdrxd _ dr t pdrxd _ rd 50 % 50 % gnda gdnb v id rise / fall time < 3 ns maxim integrated g 7 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
v dda = 3.3v to gnda, 60 load between canh and canl, gnda = gndb, t a = 25oc, unless otherwise noted. typical operating characteristics 0 1 2 3 4 5 6 7 8 -40 -25 -10 5 20 35 50 65 80 95 110 125 i dda (ma) temperature (oc) v dda supply current vs. temperature txd = high toc01 txd = low, no load txd = low, 60 load 0 5 10 15 20 25 30 35 0.01 0.1 1 i ddb (ma) data rate (mhz) v ddb supply current vs. data rate toc04 no load r l = 60 ? -20 0 20 40 60 80 100 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 short current (ma) canl voltage (v) canl short circuit current vs. voltage toc07 txd = low 0 10 20 30 40 50 60 -40 -25 -10 5 20 35 50 65 80 95 110 125 i ddb (ma) temperature (oc) v ddb supply current vs. temperature txd = high toc02 txd = low, no load txd = low, 60 load 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 can - canl (v) temperature (oc) (canh - canl) output voltage vs. temperature toc05 txd = low 60 load between canh and canl 0 1 2 3 4 5 6 7 0.01 0.1 1 i dda (ma) data rate (mhz) v dda supply current vs. data rate toc03 no load r l = 60 ? -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 short current (ma) canh voltage (v) canh short - circuit current vs. voltage toc06 txd = low maxim integrated 8 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
v dda = 3.3v to gnda, 60 load between canh and canl, gnda = gndb, t a = 25oc, unless otherwise noted. typical operating characteristics (continued) 0 10 20 30 40 50 60 70 80 90 100 110 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation dela (ns) temperature (oc) rxd propagation delay vs. temperature toc10 15pf load on rxd t pdrxd_rd t pdrxd_dr td1/td2 2v/div 0v toc13 400ns/div 100ma load on v ddb transformer driver - -2 -1 2 11 12 switching frequency (h) temperature (c) transformer switching frequency vs.temperature toc11 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 5 10 15 20 25 30 35 40 (canh - canl) (v) load current (ma) (canh - canl) voltage vs. load resistance toc08 txd = low 60 load line 120 load line 0 100 200 300 400 500 600 0 100 200 300 400 500 600 700 drive voltage (mv) sink current (ma) td1/td2 voltage vs. load current toc12 0 10 20 30 40 50 60 70 80 90 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation dela (ns) temperature (oc) txd propagation delay vs. temperature toc09 t pdtxd_rd t pdtxd_dr c l = 100pf r l = 60 maxim integrated 9 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
pin name function ref supply type controller-side (a-side) 1 td1 transformer driver output 1 gnda analog 2 td2 transformer driver output 2 gnda analog 3 gnda controller-side/a-side ground. gnda is the ground reference for pol, txd, and rxd. ground 4 v dda power supply input for the controller-side/a-side. bypass v dda to gnda with both a 0.1f and a 1f capacitor as close to the device as possible. gnda power 5 rxd receiver output. rxd is high when the bus is in the recessive state. rxd is low when the bus is in the dominant state. gnda digital output 6 n.c. no connection. not internally connected. connect to gnda, v dda , or leave unconnected. gnda 7 pol polarity set input. drive pol low for normal canh, canl operation (canh is high and canl is low when txd is low). drive pol high to swap the functions of canh and canl (canh is low and canl is high when txd is low). see table 1 for more information. gnda digital input 8 txd transmit data input. canh and canl are in the dominant state when txd is low. canh and canl are in the recessive state when txd is high. gnda digital input pin description pin confguration i . c. canh v dda 1 2 16 15 v ddb gndb td2 gnda td1 soic (w) top view 3 4 14 13 i.c. v ldo pol 5 12 canl rxd n.c. 6 7 11 10 gndb txd 8 9 max14882 maxim integrated 10 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
detailed description the max14882 isolated controller area network (can) transceiver provides 5000v rms (60s) of galvanic isolation between the cable-side (b-side) of the transceiver and the controller-side (a-side). this device allows up to 1mbps communication across the isolation barrier when a large potential exists between grounds on each side of the barrier. canh and canl outputs are short-circuit current-limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs in a high-impedance state. isolation both data and power can be transmitted across the isolation barrier. data isolation is achieved using integrated capaci - tive isolation that allows data transmission between the controller-side and the cable-side of the transceiver. to achieve power isolation, the max14882 features an integrated transformer driver to drive an external center- tapped transformer, allowing the transfer of operating power from the controller-side, across the isolation barrier, to the cable-side. connect the primary side of the external transformer to the max14882s transformer driver outputs (td1 and td2). fault protection the max14882 features 54v fault protection on the canh and canl bus lines. when canh or canl is pulled above +30v (typ) or below -30v (typ), the i/o is set to high-impedance. this wide fault protection range simplifies selecting external tvs components for surge protection. transmitter the transmitter converts a single-ended input signal (txd) from the can controller to differential outputs for the bus lines (canh, canl). the truth table for the transmitter and receiver is given in table 1 . transmitter dominant timeout the max14882 features a transmitter-dominant timeout (t dom ) that prevents erroneous can controllers from clamping the bus to a dominant level by maintaining a continuous low txd signal. when txd remains in the dominant state (low) for greater than t dom , the transmitter is disabled, releasing the bus to a recessive state ( table 1 ). after a dominant timeout fault, normal transmitter function is re-enabled on the rising edge of a txd. the transmitter- dominant timeout limits the minimum possible data rate to 7.86kbps for standard can protocol. pin name function ref supply type can bus-side (b-side) 9, 15 gndb bus-side/b-side ground. gndb is the ground reference for v ldo , v ddb , canh, and canl. ground 10 v ldo ldo power input. connect a minimum voltage of 4.68v to v ldo to power the bus-side of the transceiver. bypass v ldo to gndb with both 0.1f and 1f capacitors as close as possibl e to the device. to disable the internal ldo, leave v ldo unconnected or connect to gndb. gndb power input 11, 14 i.c. internally connected. connect to gndb. gndb 12 canl low-level can diferential bus line gndb diferential i/o 13 canh high-level can diferential bus line gndb diferential i/o 16 v ddb bus-side power input/ldo power output. bypass v ddb to gndb with both 0.1f and 1f capacitors as close as possible to the device. v ddb is the output of the internal ldo when power is applied to v ldo . when the internal ldo is not used (v ldo is unconnected or connected to gndb), v ddb is the positive supply input for the bus-side of the ic. gndb power pin description (continued) maxim integrated 11 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
transmitter and receiver functionality when not connected to the bus transformer driver overcurrent limiting the max14882 features overcurrent limiting to protect the integrated transformer driver from excessive currents when charging large capacitive loads or driving into short- circuits. current limiting is achieved in two stages: internal circuitry monitors the output current and detects when the peak current rises above 1.2a. when the 1.2a threshold is exceeded, internal circuitry reduces the output current to the 730ma current-limit. the max14882 monitor the driver current on a cycle-by-cycle basis and limit the current until the short is removed. the transformer driver on the max14882 can dissipate large amounts of power during overcurrent limiting,causing the ic to enter thermal shutdown. when the junction temperature exceeds the thermal shutdown threshold, the td1 and td2 driver outputs are disabled. the driver resumes normal operation when the temperature falls below the thermal shutdown temperature minus the hysteresis. driver output protection the max14882 features integrated circuitry to protect the transmitter output stage against a short-circuit to a positive or negative voltage by limiting the driver current. the transmitter returns to normal operation once the short is removed. thermal shutdown further protects the transceiver from excessive temperatures that may result from a short by setting the transmitter outputs to high impedance when the junction temperature exceeds +160c (typ). the transmitter returns to normal operation when the junction temperature falls below the thermal shutdown hysteresis. receiver the receiver reads the differential input from the bus (canh, canl) and transfers this data as a single-ended output (rxd) to the can controller. during normal opera - tion, a comparator senses the difference between canh and canl, v diff = |v canh - v canl |, with respect to an internal threshold of 0.7v (typ). if v diff > 0.9v, a logic- low is present on rxd. if v diff < 0.5v, a logic-high is present. the canh and canl common-mode range is 25v. rxd is logic-high when canh and canl are shorted or terminated and undriven. pol txd txd low time canh canl bus state rxd l l < t dom h l dominant l l l t dom v ddb /2 v ddb /2 recessive h l h x v ddb /2 v ddb /2 recessive h h l < t dom l h dominant l h l t dom v ddb /2 v ddb /2 recessive h h h x v ddb /2 v ddb /2 recessive h x = don't care table 1. transmitter and receiver functionality when not connected to the bus maxim integrated 12 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
transformer selection the integrated push-pull transformer driver allows the transmission of operating power from the logic side, across the isolation barrier, to the isolated field side of the device. the 450khz (typ) transformer driver operates with center-tapped primary transformers. select a transformer with an et product greater than or equal to the et of the driver to ensure that the transformer does not enter saturation. e is the voltage applied to the transformer and t is the maximum time it is applied during any one cycle. calculate the minimum et product for the transformer primary as: et = v max /(2 x f min ) where v max is the worst-case maximum supply voltage on v dda and f min is the minimum frequency at that supply voltage. for example, using 5.5v and 350khz, the required minimum et product is 7.9vs. table 2 shows a list of recommended transformers to use with the max14882. applications information reduced emi and refections in multidrop can applications, it is important to maintain a single linear bus, of uniform impedance, that is properly terminated at each end. do not use a star configuration. any deviation from the end-to-end wiring scheme creates a stub. high-speed data edges on a stub can create reflections back down the bus and can cause data errors, by eroding the noise margin of the system. although stubs are unavoidable in a multidrop system, care should be taken to keep these stubs as short as possible, especially when operating with high data rates. recommended transformers table 2. recommended transformers manufacturer part number application turns ratio isolation (v rms ) operating temp et constant (v x s , min) operating current ( m a) dimensions (l x w x h) ( mm ) wurth 750315225 5v to 5v 1ct:1.1ct 2750 -40c to +125c 9.44 200 6.73 x 7.14 x 4.19 wurth 750315226 5v to 5v 1ct:1.3ct 2750 9.44 200 6.73 x 7.14 x 4.19 wurth 750315227 3.3v to 5v 1ct:1.7ct 2750 9.44 200 6.73 x 7.14 x 4.19 wurth 750315228 3.3v to 5v 1ct:2ct 2750 9.44 160 6.73 x 7.14 x 4.19 wurth 750315229 5v to 5v 1ct:1.13ct 5000 -40c to +125c 10.7 200 9.14 x 8.00 x 7.62 wurth 750315230 5v to 5v 1ct:1.38ct 5000 10.7 150 9.14 x 8.00 x 7.62 maxim integrated 13 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
part isolation rating v dda supply pol v ddb ldo voltage transformer driver package max14882awe+ 5kv rms 3.0v to 5.5v yes 5v yes 16 soic (w) max14882awe+t 5kv rms 3.0v to 5.5v yes 5v yes 16 soic (w) +denotes a lead (pb)-free/rohs-compliant package t = tape and reel ordering information microcontroller 1 1 1 3 . 3 v 2 2 rx tx gpio rxd txd pol v dda td 1 td 2 v ldo 2 v ddb 2 canh canl 2 max 14882 3 microcontroller rx tx gpio 4 4 4 3 . 3 v 3 3 rxd txd pol v dda td 1 td 2 v ldo 3 v ddb canh canl 3 max 14882 sossowxw maxim integrated 14 www.maximintegrated.com max14882 5kv rms isolated can transceiver with integrated transformer driver
revision number revision date description pages changed 0 2/18 initial release revision history ? 2018 maxim integrated products, inc. 15 maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifcations without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max14882 5kv rms isolated can transceiver with integrated transformer driver for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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