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? semiconductor components industries, llc, 2009 january, 2009 ? rev. 3 1 publication order number: amis ? 42671/d AMIS-42671 high speed autobaud can transceiver general description the amis ? 42671 can transceiver with autobaud is the interface between a controller area network (can) protocol controller and the physical bus. it may be used in both 12 v and 24 v systems. the transceiver provides differential transmit capability to the bus and differential receive capability to the can controller. due to the wide common ? mode voltage range of the receiver inputs, the amis ? 42671 is able to reach outstanding levels of electromagnetic susceptibility (ems). similarly, extremely low electromagnetic emission (eme) is achieved by the excellent matching of the output signals. the amis ? 42671 is primarily intended for industrial network applications where long network lengths are mandatory. examples are elevators, in ? building networks, process control and trains. to cope with the long bus delay the communication speed needs to be low. amis ? 42671 allows low transmit data rates down 10 kbit/s or lower. the autobaud function allows the can controller to determine the incoming baud rate without influencing the can communication on the bus. features ? fully compatible with the iso 11898 ? 2 standard ? autobaud function ? wide range of bus communication speed (0 up to 1 mbit/s) ? allows low transmit data rate in networks exceeding 1 km ? ideally suited for 12 v and 24 v industrial and automotive applications ? low electromagnetic emission (eme), common ? mode choke is no longer required ? differential receiver with wide common ? mode range ( 35 v) for high ems ? no disturbance of the bus lines with an un ? powered node ? thermal protection ? bus pins protected against transients ? silent mode in which the transmitter is disabled ? short circuit proof to supply voltage and ground ? logic level inputs compatible with 3.3 v devices ? esd protection for can bus at 8 kv ? these are pb ? free devices* *for additional information on our pb ? free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. http://onsemi.com pin assignment (top view) 5 6 7 8 1 2 3 4 txd rxd autb gnd canl amis ? 42671 pc20070929.1 see detailed ordering and shipping information in the package dimensions section on page 12 of this data sheet. ordering information v cc canh v ref
amis ? 42671 http://onsemi.com 2 table 1. technical characteristics symbol parameter condition max max unit v canh dc voltage at pin canh 0 < v cc < 5.25v; no time limit ? 45 +45 v v canl dc voltage at pin canl 0 < v cc < 5.25v; no time limit ? 45 +45 v v o(dif)(bus_dom) differential bus output voltage in dominant state 42.5 < r lt < 60 1.5 3 v t pd(rec ? dom) propagation delay txd to rxd see figure 7 70 245 ns t pd(dom ? rec) propagation delay txd to rxd see figure 7 100 245 ns c m ? range input common ? mode range for comparator guaranteed differential receiver threshold and leakage current ? 35 +35 v v cm ? peak common ? mode peak see figures 8 and 9 (note 1) ? 500 500 mv v cm ? step common ? mode step see figures 8 and 9 (note 1) ? 150 150 mv 1. the parameters v cm ? peak and v cm ? step guarantee low electromagnetic emission.
amis ? 42671 http://onsemi.com 3 figure 1. block diagram canh canl amis ? 42671 gnd rxd v cc 2 7 6 5 autb 1 driver control thermal shutdown v cc 8 4 pc20070930.2 txd 3 v ref comp v cc / 2 + r i(cm) r i(cm) auto- baud control slope control table 2. pin description pin name description 1 txd transmit data input; low input dominant driver; internal pullup current 2 gnd ground 3 v cc supply voltage 4 rxd receive data output; dominant transmitter low output 5 v ref reference voltage output 6 canl low ? level can bus line (low in dominant mode) 7 canh high ? level can bus line (high in dominant mode) 8 autb autobaud mode control input; internal pulldown current
amis ? 42671 http://onsemi.com 4 table 3. absolute maximum ratings symbol parameter conditions min max unit v cc supply voltage ? 0.3 +7 v v canh dc voltage at pin canh 0 < v cc < 5.25 v; no time limit ? 45 +45 v v canl dc voltage at pin canl 0 < v cc < 5.25 v; no time limit ? 45 +45 v v txd dc voltage at pin txd ? 0.3 v cc + 0.3 v v rxd dc voltage at pin rxd ? 0.3 v cc + 0.3 v v autb dc voltage at pin autb ? 0.3 v cc + 0.3 v v ref dc voltage at pin v ref ? 0.3 v cc + 0.3 v v tran(canh) transient voltage at pin canh note 2 ? 150 +150 v v tran(canl) transient voltage at pin canl note 2 ? 150 +150 v v esd electrostatic discharge voltage at all pins note 3 note 4 ? 4 ? 500 +4 +500 kv v latch ? up static latch ? up at all pins note 5 100 ma t stg storage temperature ? 55 +155 c t a ambient temperature ? 40 +125 c t j maximum junction temperature ? 40 +150 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. 2. applied transient waveforms in accordance with iso 7637 part 3, test pulses 1, 2, 3a, and 3b (see figure 3). 3. standardized human body model esd pulses in accordance to mil883 method 3015.7. 4. static latch ? up immunity: static latch ? up protection level when tested according to eia/jesd78. 5. standardized charged device model esd pulses when tested according to eos/esd ds5.3 ? 1993. table 4. thermal characteristics symbol parameter conditions value unit r th(vj ? a) thermal resistance from junction ? to ? ambient in so ? 8 package in free air 150 k/w r th(vj ? s ) thermal resistance from junction ? to ? substrate of bare die in free air 45 k/w
amis ? 42671 http://onsemi.com 5 application information amis ? 42671 canh canl gnd rxd txd vref 2 1 3 45 6 7 8 pc20071001.1 v cc autb can controller vbat 5v ? reg in out 47 nf 60 60 can bus 47 nf 60 60 v cc gnd figure 2. application diagram
amis ? 42671 http://onsemi.com 6 functional description operating modes the behavior of amis ? 42671 under various conditions is illustrated in table 5 below. in case the device is powered, one of two operating modes can be selected through pin autb. table 5. functional table of amis ? 42671 when not connected to the bus; x = don?t care vcc pin txd pin autb pin canh pin canl bus state pin rxd 4.75 to 5.25 v 0 0 (or floating) high low dominant 0 4.75 to 5.25 v 1 (or floating) 1 v cc /2 v cc /2 recessive 1 4.75 to 5.25 v 1 (or floating) x v cc /2 v cc /2 recessive 1 v cc < porl (unpowered) x x 0 v < canh < v cc 0v < canl < v cc recessive 1 porl < v cc < 4.75 v >2 v x 0 v < canh < v cc 0v < canl < v cc recessive 1 high ? speed mode if pin autb is pulled low (or left floating), the transceiver is in its high ? speed mode and is able to communicate via the bus lines. the signals are transmitted and received to the can controller via the pins txd and rxd. the slopes on the bus line outputs are optimized to give extremely low electromagnetic emissions. autobaud mode if pin autb is pulled high, amis ? 42671 is in autobaud mode. the transmitter is disabled while the receiver remains active. all other ic functions also continue to operate. normal bus activity can be monitored at the rxd pin and transmit data on txd is looped back to rxd without influencing the can communication. autb txd rxd canh canl pc20071002.4 figure 3. simplified schematic diagram of autobaud function in autobaud mode the local can controller is able to detect the used communication speed of other transmitting network nodes. bus communication is received and via the rxd pin sent to the can controller. if the can controller operates at the wrong baud rate, it will transmit an error frame. this message will be looped back to the can controller which will increment its error counter. the can controller will be reset with another baud rate. when an error ? free message is received, the correct baud rate is detected. a logic low may now be applied to pin autb, returning to the high ? speed mode. overtemperature detection a thermal protection circuit protects the ic from damage by switching off the transmitter if the junction temperature exceeds a value of approximately 160 c. because the transmitter dissipates most of the power, the power dissipation and temperature of the ic is reduced. all other ic functions continue to operate. the transmitter off ? state resets when pin txd goes high. the thermal protection circuit is particularly necessary when a bus line short ? circuits.
amis ? 42671 http://onsemi.com 7 high communication speed range the transceiver is primarily intended for industrial applications. it allows very low baud rates needed for long bus length applications. but also high speed communication is possible up to 1 mbit/s. fail ? safe features a current ? limiting circuit protects the transmitter output stage from damage caused by an accidental short ? circuit to either positive or negative supply voltage, although power dissipation increases during this fault condition. the pins canh and canl are protected from automotive electrical transients (according to ?iso 7637?; see figure 4). pin txd is pulled high internally should the input become disconnected.
amis ? 42671 http://onsemi.com 8 electrical characteristics definitions all voltages are referenced to gnd (pin 2). positive currents flow into the ic. sinking current means the current is flowing into the pin; sourcing current means the current is flowing out of the pin. table 6. dc characteristics v cc = 4.75 v to 5.25 v, t a = ? 40 c to +150 c; r lt = 60 unless specified otherwise. symbol parameter conditions min typ max unit supply (pin v cc ) i cc supply current dominant; v txd = 0v recessive; v txd = v cc 25 2 45 4 65 8 ma transmitter data input (pin txd) v ih high ? level input voltage output recessive 2.0 ? v cc + 0.3 v v il low ? level input voltage output dominant ? 0.3 ? +0.8 v i ih high ? level input current v txd = v cc ? 1 0 +1 a i il low ? level input current v txd = 0v ? 75 ? 200 ? 350 a c i input capacitance not tested ? 5 10 pf mode select (pin autb) v ih high ? level input voltage autobaud mode 2.0 ? v cc + 0.3 v v il low ? level input voltage high ? speed mode ? 0.3 ? +0.8 v i ih high ? level input current v s = 2 v 20 30 50 a i il low ? level input current v s = 0.8 v 15 30 45 a receiver data output (pin rxd) v oh high ? level output voltage i rxd = ? 10 ma 0.6 x v cc 0.75 x v cc v v ol low ? level output voltage i rxd = 6 ma 0.25 0.45 v reference voltage output (pin v ref ) v ref reference output voltage ? 50 a < i vref < +50 a 0.45 x v cc 0.50 x v cc 0.55 x v cc v v ref_cm reference output voltage for full common mode range ? 35 v amis ? 42671 http://onsemi.com 9 table 6. dc characteristics v cc = 4.75 v to 5.25 v, t a = ? 40 c to +150 c; r lt = 60 unless specified otherwise. symbol unit max typ min conditions parameter bus lines (pins canh and canl) v i(dif)(th) differential receiver threshold voltage ? 5 v < v canl < +10 v; ? 5 v < v canh < +10 v; see 0.5 0.7 0.9 v v ihcm(dif)(th) differential receiver threshold voltage for high common ? mode ? 35 v < v canl < +35 v; ? 35 v < v canh < +35 v; see 0.25 0.7 1.05 v v i(dif)(hys) differential receiver input voltage hysteresis ? 5 v < v canl < +10 v; ? 5 v < v canh < +10 v; see 50 70 100 mv r i(cm)(canh) common ? mode input resistance at pin canh 15 25 37 k r i(cm)(canl) common ? mode input resistance at pin canl 15 25 37 k r i(cm)(m) matching between pin canh and pin canl common ? mode input resistance v canh = v canl ? 3 0 +3 % r i(dif) differential input resistance 25 50 75 k r i(cm)(m) matching between pin canh and pin canl common ? mode input resistance v canh = v canl ? 3 0 +3 % r i(dif) differential input resistance 25 50 75 k c i(canh) input capacitance at pin canh v txd = v cc ; not tested 7.5 20 pf c i(canl) input capacitance at pin canl v txd = v cc ; not tested 7.5 20 pf c i(dif) differential input capacitance v txd = v cc ; not tested 3.75 10 pf i li(canh) input leakage current at pin canh v cc = 0 v; v canh = 5 v 10 170 250 a i li(canl) input leakage current at pin canl v cc = 0 v; v canl = 5 v 10 170 250 a v cm ? peak common ? mode peak during transition from dom rec or rec dom see figures 8 and 9 ? 500 500 mv v cm ? step difference in common ? mode between dominant and recessive state see figures 8 and 9 ? 150 150 mv power ? on ? reset (por) porl por level canh, canl, v ref in tri ? state below por level 2.2 3.5 4.7 v thermal shutdown t j(sd) shutdown junction temperature 150 160 180 c timing characteristics (see figures 6 and 7) t d(txd ? buson) delay txd to bus active v s = 0 v 40 85 130 ns t d(txd ? busoff) delay txd to bus inactive v s = 0 v 30 60 105 ns t d(buson ? rxd) delay bus active to rxd v s = 0 v 25 55 105 ns t d(busoff ? rxd) delay bus inactive to rxd v s = 0 v 65 100 135 ns t pd(rec ? dom) propagation delay txd to rxd from recessive to dominant v s = 0 v 70 245 ns t d(dom ? rec) propagation delay txd to rxd from dominant to recessive v s = 0 v 100 245 ns
amis ? 42671 http://onsemi.com 10 measurement setups and definitions amis ? 42671 v cc gnd 2 3 canh canl v ref 5 6 7 pc20071002.3 autb 8 rxd 4 txd 1 1nf 100 nf +5 v 20 pf 1nf transient generator figure 4. test circuit for transients v rxd v i(dif)(hys) high low 0.5 0.9 pc20040829.7 hysteresis figure 5. hysteresis of the receiver amis ? 42671 v cc gnd 2 3 canh canl v ref 5 6 7 r lt c lt pc20071002.3 autb 8 rxd 4 txd 1 60 100 pf 100 nf +5 v 20 pf figure 6. test circuit for timing characteristics
amis ? 42671 http://onsemi.com 11 canh canl txd rxd dominant 0.9v 0.5v recessive 0.7 x v cc v i(dif) = v canh ? v canl t d(txd ? buson) t d(buson ? rxd) t pd(rec ? dom) t d(txd ? busoff) t d(busoff ? rxd) t pd(dom ? rec) pc20040829.6 0.3 x v cc high low figure 7. timing diagram for ac characteristics 10 nf amis ? 42671 v cc gnd 2 3 canh canl v ref 5 6 7 pc20071002.2 autb 8 rxd 4 txd 1 30 active probe 100 nf +5 v 20 pf generator 30 6.2 k 47 nf 6.2 k spectrum anayzer figure 8. basic test setup for electromagnetic measurement canh canl recessive v cm ? peak pc20040829.7 v cm ? peak v cm ? step figure 9. common ? mode voltage peaks (see measurement setup figure 8) v cm = 0.5*(v canh +v canl )
amis ? 42671 http://onsemi.com 12 device ordering information part number temperature range package type shipping ? amis42671icab1g ? 40 c ? 125 c soic ? 8 (pb ? free) 96 tube / tray amis42671icab1rg ? 40 c ? 125 c soic ? 8 (pb ? free) 3000 / tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
amis ? 42671 http://onsemi.com 13 package dimensions soic 8 case 751az ? 01 issue o on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 amis ? 42671/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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