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data sheet version 1.2 1 2001-12-12 fault tolerant differential can-transceiver tle 6254 g preliminary data sheet p-dso-14-13 1 features ? data transmission rate up to 125 kbaud very low current consumption in stand-by and sleep operation mode implemented receive-only mode optimized emc behavior wake-up input pin, dual edge sensitive battery fail flag extended bus failure management to guarantee safe operation during all bus line failure events full support of dual failure conditions fully wake-up capability during all bus line failures conditions supports one-wire transmission mode with ground offset voltages up to 1.5 v prevention from bus occupation in case of can controller failure thermal protection bus line error protection against transients in automotive environment 2 description the can-transceiver tle 6254 works as the interface between the can protocol controller and the physical can bus-lines. it is optimized for low-speed data transmission (up to 125 kbaud) in automotive and industrial applications. while no data is transferred, the power consumption can be minimized by multiple low power modes. in normal operation mode a differential signal is transmitted/received. when bus wiring failures are detected the device automatically switches in a dedicated single-wire mode to maintain communication. type ordering code package tle 6254 g q 67006-a9528 p-dso-14-13 (smd)
preliminary data tle 6254 pin configuration (top view) data sheet version 1.2 2 2001-12-12 3 pin configuration (top view) figure 1 table 1 pin definitions and functions pin no. symbol function 1inh inhibit output; for controlling an external voltage regulator 2txd transmit data input; integrated pull up, low: bus becomes dominant, high: bus becomes recessive 3rxd receive data output; integrated pull up, low: bus is dominant, high: bus is recessive 4nerr error flag output; integrated pull up, low: bus error (in normal operation mode), further functions see table 3 5nstb not stand-by input; digital control inputs to select operation modes, see figure 4 6ent enable transfer input; digital control input to select operation modes, see figure 4 v s v cc txd 3 4 5 1 2 10 nerr inh nstb canl rxd 12 11 14 13 canh 6 7 ent rtl rth 8 9 wk gnd p-dso-14-13
data sheet version 1.2 3 2001-12-12 preliminary data tle 6254 pin configuration (top view) 7wk wake-up input; if level of v wake changes the device indicates a wake-up from low power mode by switching the rxd and int outputs low and switching the inh output high (in sleep mode), see table 3 8rth termination resistor output; connect to canh bus-line via termination resistor (500 ? < r rth < 16 k ? ), controlled by internal failure management 9rtl termination resistor output; connect to canl bus-line via termination resistor (500 ? < r rtl < 16 k ? ), controlled by internal failure and mode management 10 v cc supply voltage input; + 5 v, block to gnd directly at the ic with ceramic capacitor 11 canh can bus line h; high: dominant state 12 canl can bus line l; low: dominant state 13 gnd ground 14 v s battery voltage supply input; block to gnd directly at the ic with ceramic capacitor table 1 pin definitions and functions (cont?d) pin no. symbol function
preliminary data tle 6254 functional block diagram data sheet version 1.2 4 2001-12-12 4 functional block diagram figure 2 block diagram output stage mode control (normal, stand-by, sleep) time out driver temp.- protection bus failure wake-up vbat fail flag filter 12 canh rth canl rtl wk inh vcc 1 11 9 8 10 14 vs failure management multiplexer receiver 7.2 3.2 7.2 -2.8 1.8 5 6 7 nstb ent 2 txd 4 nerr rxd 3 13 gnd vcc vcc v cc v cc
data sheet version 1.2 5 2001-12-12 preliminary data tle 6254 circuit description 5 circuit description the can transceiver tle 6254 works as the interface between the can protocol controller and the physical can bus-lines. figure 3 shows the principle configuration of a can network. the tle 6254 is optimized for low-speed data transmission (up to 125 kbaud) in automotive and industrial applications. in normal operation mode a differential signal is transmitted/received. when bus wiring failures are detected the device automatically switches in a dedicated single-wire mode to maintain communication. while no data is transferred, the power consumption can be minimized by multiple low power operation modes. further a receive-only mode is implemented. to reduce radiated electromagnetic emission (eme) the dynamic slopes of the canl and canh signals are both limited and symmetric. this allows the use of an unshielded twisted or parallel pair of wires for the bus. during single-wire transmission (one of the bus lines is affected by a bus line failure) the eme performance of the system is degraded from the differential mode. in case the transmission data input txd is permanently dominant, both, the canh and canl transmitting stage are disabled after a certain delay time. this is necessary to prevent the bus from being blocked by a defective protocol unit or short to gnd at the txd input. figure 3 can network example controller 1 rxd txd transceiver 1 1 1 local area 1 transceiver 2 local area 2 controller 2 bus line aes02410 txd 2 rxd 2
preliminary data tle 6254 circuit description data sheet version 1.2 6 2001-12-12 sleep mode nstb float. inh ent 00 v bat stand-by nstb high inh ent 00 nstb high inh ent 10 rxd-only start up power up nstb ent 0 1 ent 0 ent 1 nstb ent or v cc 0 0 low nstb v cc 0 or low nstb 1 normal mode nstb high inh ent 11 go to sleep mode nstb float. inh ent 01 nstb 0 ent 1 wake-up via can-bus or wk-input; t > t wu(min) or t > t wk(min) ent t < t h(min) 0 ent = 1 t > t h(min) nstb ent 1 1 power down figure 4 state diagram
data sheet version 1.2 7 2001-12-12 preliminary data tle 6254 circuit description 5.1 operation modes, wake-up in addition to the normal operation mode, the tle 6254 offers a receive-only mode as well as two low power operation modes to save power during periods that do not require communication on the can bus: sleep mode, v bat stand-by mode (see table 5 and figure 4 ). via the control input pins nstb and ent the operation modes are selected by the microcontroller. in the low power modes neither receiving nor transmitting of messages is possible. in sleep operation mode the lowest power consumption is achieved. in order to minimize the overall current consumption of the ecu (electronic control unit) the external voltage regulator (5 v supply) is deactivated by the inh output in this mode, when connected. for that purpose the inh output is switched to high impedance. in parallel the canl line is pulled-up to the battery supply voltage via the rtl output and the pull-up paths at the input pins txd and rxd are disabled from the internal supply. to enter the sleep operation mode the transition mode ?go-to-sleep? has to be selected ( figure 4 ) for a minimum time t h(min) . after the minimum hold time t h(min) the sleep mode can be actively selected. otherwise the tle 6254 will automatically fall in sleep mode because of the not powered microcontroller. on a wake-up request either by bus line activities or via the wake input, the transceiver is automatically set in v bat -stand-by mode. now the voltage regulator (5 v supply) is enabled by the inh output. the wake input reacts to both, transition from high to low voltage level as well as the other way round. to avoid faulty wake-ups due to transients on the bus lines or the wake input circuitry respectively, a certain filter time is implemented. as soon as v cc is provided, the wake-up request is monitored on both, the nerr and rxd outputs, by setting them low. upon this the microcontroller can activate the normal operation mode by setting the control inputs nstb and ent high. the v bat stand-by mode corresponds to the sleep mode, but a voltage regulator connected to the inh output will remain active. wake-up requests via the wake pin or the bus lines are immediately reported to the microcontroller by setting rxd and nerr low. a power-on condition ( v bat pin is supplied) automatically switches the tle 6254 to v bat stand-by mode. in the receive-only mode data on the can-bus are transvered to the rxd output, but both output stages, canh as well as canl are disabled. this means that data at the txd input are not transmitted to the can bus. this mode is useful in combination to a dedicated network-management software that allowes separate diagnosis for all nodes. a wake-up request in the receive-only mode is only reported at the rxd-output. the nerr output in this mode is used to indicate a battery fail condition. when entering the normal mode the v bat -flag is reset and the nerr output becomes high again. this feature is useful e.g. when changing the ecu and therefore a presetting routine of the microcontroller has to be started.
preliminary data tle 6254 circuit description data sheet version 1.2 8 2001-12-12 if either of the supply voltages drops below the specified limits, the transceiver is automatically switched to v bat stand-by mode or power down mode respectively. . 5.2 bus failure management the tle 6254 detects the bus failures as described in table 3, and automatically switches to a dedicated canh or canl single wire mode to maintain data transmission if necessary. therefore, the device is equipped with one differential receiver and 4 single ended receivers, two for each bus line. to avoid false triggering by external rf influences the single wire modes are only activated after a certain delay time. as soon as the bus failure disappears the transceiver switches back to differential mode after another time delay. bus failures are indicated in the normal operation mode by setting the nerr output low. the differential receiver threshold is typ. ? 2.8 v. this ensures correct reception in the normal operation mode as well as in the failure cases 1, 2 and 4 with a noise margin as high as possible. for these failures, further failure management is not necessary. detection of the failure cases 1, 2, 3a and 4 is only possible when the bus is dominant. nevertheless, they are reported on the nerr output until transmission of the next can word on the bus begins. table 2 truth table of the can transceiver nstb ent mode inh nerr rxd rtl 00 v bat stand-by mode 1) 1) wake-up interrupts are released when entering normal operation mode. v bat active low wake-up interrupt if v cc is present switched to v bat 0 0 sleep mode 2) 2) if go to sleep command was used before, ent may turn low as v cc drops, without affecting internal functions. floating switched to v bat 0 1 go to sleep command becomes floating switched to v bat 1 0 receive-only mode v bat active low v bat power-on flag 3) 3) v bat power-on flag will be reseted when entering normal operation mode. high = recessive receive data; low = dominant receive data switched to v cc 1 1 normal mode v bat active low bus error flag high = recessive receive data; low = dominant receive data switched to v cc
data sheet version 1.2 9 2001-12-12 preliminary data tle 6254 circuit description when one of the bus failures 3, 5, 6, 6a and 7 is detected, the defective bus wire is disabled by switching off the affected bus termination and the respective output stage. a wake-up from sleep mode via the bus is possible either via a dominant canh or canl line. this ensures that a wake-up is possible even if one of the failures 1 to 7 occurs. table 3 can bus-line failures (according to iso 11519-2) a current limiting circuit protects the can transceiver output stages from damage by short-circuit to positive and negative battery voltages. the canh and canl pins are protected against electrical transients which may occur in the severe conditions of automotive environments. the transmitter output stages generate the majority of the power dissipation. therefore they are disabled if the junction temperature exceeds the maximum value. this effectively reduces power dissipation, and hence will lead to a lower chip temperature, while other parts of the ic can remain operating. in temperature shut-down condition the tle 6254 is still able to receive can-bus messages. 5.3 comparison tle 6254 versus tle 6252 in the following table ( table 4 ) the min differences between the tle 6252 and tle 6254 are listed. failure # failure description 1 canl line interrupted 2 canh line interrupted 3 canl line shorted to v bat 3a canl line shorted to v cc 4 canh line shorted to gnd: 5 canl line shorted to gnd: 6 canh line shorted to v bat 6a canh line shorted to v cc 7 canl line shorted to canh line
preliminary data tle 6254 circuit description data sheet version 1.2 10 2001-12-12 table 4 tle 6254 versus tle 6252 5.4 application hints the transceiver will stay in a present operating mode until a suitable condition disposes a state change. if not otherwise defined all conditions are and-combined. the signals v cc and v bat show if the supply is available (e.g. v cc = 1: v cc voltage is present). if at minimum one supply voltage is switched on, the start-up procedure begins (not figured). after a delay time the device changes to normal operating or stand-by mode. tle 6254 tle 6252 receive-only mode vcc-stand-by mode improved emc susceptability - improved bus failure handling for shorts of the can-bus lines to vcc - threshold for power-on flag: typ: 2.7 v threshold for power-on flag: typ: 1.0 v a transition from vbat-stand-by mode to the go-to sleep command is possible also after a wake-up from sleep mode. internal wake flag after wake-up from sleep mode is deleted by transition to normal mode. this flag needs to be deleted before entering the go-to-sleep command again. all dual failure conditions are handled some dual failure conditions are not correctly handled improved leake current behavior of rtl pin in power down state. table 5 not needed pins pin symbol recommendation inh leave open nerr leave open nstb connect to v cc ent connect to v cc wake connect to v bat , if not possible connect to gnd: increases current consumption by approx. 5 a
data sheet version 1.2 11 2001-12-12 preliminary data tle 6254 absolute maximum ratings note: stresses above those listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. 6 absolute maximum ratings parameter symbol limit values unit notes min. max. input voltage at v bat v s ? 0.3 40 v ? logic supply voltage v cc v cc ? 0.3 6 v ? input voltage at txd, rxd, nerr, nstb and ent v in ? 0.3 v cc + 0.3 v ? input voltage at canh and canl v bus ? 40 40 v ? transient voltage at canh and canl v bus ? 150 100 v 1) input voltage at wake v wk ? 40 v ? output current at wake i wk ? 5ma ? input voltage at inh v inh ? 0.3 v bat + 0.3 v ? input voltage at rth and rtl v rth/l ? 0.3 40 v ? junction temperature t j ? 40 150 c ? storage temperature t stg ? 55 155 c ? electrostatic discharge voltage at pin canh, canl, rth, rtl,v bat v esd ? 44 kv 2) electrostatic discharge voltage at any other pin v esd ? 22 kv 3) 1) see iso 7637 2) human body model: equivalent to discharging a 100 pf capacitor through a 1.5 k ? resistor.
preliminary data tle 6254 operating range data sheet version 1.2 12 2001-12-12 note: in the operating range, the functions given in the circuit description are fulfilled. 7 operating range parameter symbol limit values unit notes min. max. logic input voltage v cc 4.75 5.25 v ? battery input voltage v s 627 v ? termination resistances at rtl and rth r rtl/h 500 16000 ? ? junction temperature t j ? 40 140 c ? thermal resistance junction ambient r thja ? 120 k/w ? thermal shutdown junction temperature t jsh 140 ? c ? wake input voltage wake input voltage v wk ? 0.3 27 v ?
data sheet version 1.2 13 2001-12-12 preliminary data tle 6254 static characteristics 8 static characteristics 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max. supplies v cc , v s supply current i cc ? 3.5 6.0 ma recessive; txd = v cc ? 6.5 10 ma dominant; txd = 0 v; no load supply current (receive-only mode) i cc ? 3.5 6.0 ma supply current ( v bat stand-by) i cc ? 25 50 a v cc = 5 v; v s = 12 v i s ? 30 50 a supply current (sleep operation mode) i s ? 35 55 a v cc = 0 v; v s = 12 v; battery voltage for setting power-on flag v s 1.5 2.5 3.5 v v cc stand-by mode battery voltage low time for setting power-on flag t pw(on) 10 s receive-only mode receiver output r d and error detection output nerr high level output voltage (pin nerr) v oh v cc ? 0.9 ? v cc v i 0 = ? 100 a high level output voltage (pin rxd) v oh v cc ? 0.9 ? v cc v i 0 = ? 250 a low level output voltage v ol 0 ? 0.9 v i 0 = 1.25 ma
preliminary data tle 6254 static characteristics data sheet version 1.2 14 2001-12-12 transmission input t d, not stand-by nstb and enable transfer ent high level input voltage threshold v ih 0.7 v cc ? v cc + 0.3 v ? low level input voltage threshold v il ? 0.3 ? 0.3 v cc v ? high level input current (pins nstb and ent) i ih ? 20 60 a v i = 4 v low level input current (pins nstb and ent) i il 0.7 3 ? a v i = 1 v high level input current (pin txd) i ih ? 150 ? 40 ? 10 a v i = 4 v low level input current (pin txd) i il ? 600 ? 200 ? 40 a v i = 1 v forced battery voltage stand-by mode (fail safe) v cc 2.75 ? 4.5 v ? wake-up input wake input current i il ? 3 ? 2 ? 1 a ? wake-up threshold voltage v wk(min) 2.2 3.0 3.9 v v nstb = 0 v inhibit output inh high level voltage drop ? v h = v s ? v inh ? v h ? 0.5 0.8 v i inh = ? 0.18 ma; leakage current i inh,lk ? 5.0 ? 5.0 a sleep operation mode; v inh = 0 v 8 static characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
data sheet version 1.2 15 2001-12-12 preliminary data tle 6254 static characteristics bus lines canl, canh differential receiver recessive-to-dominant threshold voltage v drxd(rd) ? 2.8 ? 2.5 ? 2.2 v v cc =5.0v differential receiver dominant-to-recessive threshold voltage v drxd(dr) ? 3.2 ? 2.9 ? 2.6 v v cc =5.0v canh recessive output voltage v canh,r 0.10 0.15 0.30 v txd = v cc ; r rth < 4 k ? canl recessive output voltage v canl,r v cc ? 0.2 ?? vtxd = v cc ; r rtl < 4 k ? canh dominant output voltage v canh,d v cc ? 1.4 v cc ? 1.0 v cc vtxd = 0 v; i canh = ? 40 ma canl dominant output voltage v canl,d ? 1.0 1.4 v txd = 0 v; i canl = 40 ma canh output current i canh ? 110 ? 80 ? 50 ma v canh = 0 v; txd = 0 v ? 50 5 a sleep operation mode; v canh = 12 v canl output current i canl 50 80 110 ma v canl = 5 v; txd = 0 v ? 50 5 a sleep operation mode; v canl = 0 v; v s = 12 v 8 static characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
preliminary data tle 6254 static characteristics data sheet version 1.2 16 2001-12-12 voltage detection threshold for short-circuit to battery voltage on canh and canl v det(th) 6.5 7.3 8.0 v ? voltage detection threshold for short-circuit to battery voltage on canh v det(th) v bat ? 2.5 v bat ? 2 v bat ? 1 v stand-by/ sleep operation mode canh wake-up voltage threshold v canh,wu 1.2 1.9 2.7 v ? canl wake-up voltage threshold v canl,wu 2.2 3.1 3.9 v ? wake-up voltage threshold hysteresis ? v wu 0.2 ?? v ? v wu = v canl,wu ? v canh,wu canh single-ended receiver threshold v canh 1.6 2.1 2.6 v failure cases 3, 5 and 7 canl single-ended receiver threshold v canl 2.4 2.9 3.4 v failure case 6 and 6a canl leakage current i canl,lk ? 50 5 a v cc =0v; v s =0v; v canl =12v; t j <85 c canh leakage current i canh,lk ? 50 5 a v cc =0v; v s =0v; v canh =5v; t j <85 c 8 static characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
data sheet version 1.2 17 2001-12-12 preliminary data tle 6254 static characteristics termination outputs rtl, rth rtl to v cc switch-on resistance r rtl ? 40 95 ? i o = ? 10 ma rtl output voltage v ortl v cc ? 1.0 v cc ? 0.7 ? v| i o | < 1 ma; v cc stand-by mode rtl to bat switch series resistance r ortl 5 1530k ? v bat stand-by or sleep operation mode rth to ground switch-on resistance r rth ? 40 95 ? i o = 10 ma rth output voltage v orth ? 0.7 1.0 v i o = 1 ma; low power mode rth pull-down current i rth,pd 40 75 120 a failure cases 6 and 6a rtl pull-up current i rtl,pu ? 120 ? 75 ? 40 a failure cases 3, 3a, 5 and 7 rth leakage current i rth,lk ? 50 5 a v cc =0v; v s =0v; v rth =5v; t j <85 c rtl leakage current i rtl,lk ? 505ma v cc =0v; v s =0v; v rtl =12v; t j <85 c 8 static characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
preliminary data tle 6254 dynamic characteristics data sheet version 1.2 18 2001-12-12 9 dynamic characteristics 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max. canh and canl bus output transition time recessive-to-dominant t rd 0.6 1.2 2.1 s 10% to 90%; c 1 = 10 nf; c 2 = 0; r 1 = 100 ? canh and canl bus output transition time dominant-to-recessive t dr 0.3 0.6 1.3 s 10% to 90%; c 1 = 1 nf; c 2 = 0; r 1 = 100 ? minimum dominant time for wake-up via canl or canh t wu(min) 15 25 40 s stand-by modes; v s = 12 v minimum wake-up time on pin wake t wk(min) 15 25 50 s low power modes; v s = 12 v failure cases 3, 6 detection time t fail 30 45 80 s ? failure case 6a detection time 24.88ms ? failure cases 5, 6, 6a, 7 recovery time 30 45 80 s ? failure cases 3 recovery time 250 500 750 s ? failure cases 5, 7 detection time 1.0 2.0 4.0 ms ? failure cases 5 detection time 0.4 1.0 2.4 ms stand-by modes; v s = 12 v failure cases 6, 6a, 7 detection time 0.8 4.0 8.0 ms stand-by modes; v s = 12 v failure cases 5, 6, 6a, 7 recovery time 0.4 1.0 2.4 ms stand-by modes; v s = 12 v
data sheet version 1.2 19 2001-12-12 preliminary data tle 6254 dynamic characteristics propagation delay txd-to-rxd low (recessive to dominant) t pd(l) ? 1.5 2.1 s c 1 = 100 pf; c 2 = 0; r 1 = 100 ? ; no failures and bus failure cases 1, 2, 3a, 4 ? 1.7 2.4 s c 1 = c 2 = 3.3 nf; r 1 = 100 ? ; no bus failure and failure cases 1, 2, 3a, 4 ? 1.8 2.5 s c 1 100 pf; c 2 = 0; r 1 = 100 ? ; bus failure cases 3, 5, 6, 6a, 7 ? 2.0 2.6 s c 1 = c 2 = 3.3 nf; r 1 =100 ? ; bus failure cases 3, 5, 6, 6a, 7 propagation delay txd-to-rxd high (dominant to recessive) t pd(h) ? 1.5 2.0 s c 1 = 100 pf; c 2 = 0; r 1 =100 ? ; no failures and bus failure cases 1, 2, 3a, 4 ? 2.5 3.5 s c 1 = c 2 = 3.3 nf; r 1 = 100 ? ; no bus failure and failure cases 1, 2, 3a, 4 9 dynamic characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
preliminary data tle 6254 dynamic characteristics data sheet version 1.2 20 2001-12-12 propagation delay txd-to-rxd high (dominant to recessive) t pd(h) ? 1.0 2.1 s c 1 100 pf; c 2 = 0; r 1 = 100 ? ; bus failure cases 3, 5, 6, 6a, 7 ? 1.5 2.6 s c 1 = c 2 = 3.3 nf; r 1 = 100 ? ; bus failure cases 3, 5, 6, 6a, 7 minimum hold time to go sleep command t h(min) 15 25 50 s ? edge-count difference (falling edge) between canh and canl for failure cases 1, 2, 3a, 4 detection nerr becomes low n e ? 4 ??? edge-count difference (rising edge) between canh and canl for failure cases 1, 2, 3a, 4 recovery ? 2 ??? txd permanent dominant disable time t txd 1.3 2.0 3.5 ms ? 9 dynamic characteristics (cont ? d) 4.75 v v cc 5.25 v; 6 v v s 27 v; normal operation mode; ? 40 t j + 125 c (unless otherwise specified). all voltages are defined with respect to ground. positive current flowing into the ic. parameter symbol limit values unit notes min. typ. max.
data sheet version 1.2 21 2001-12-12 preliminary data tle 6254 test and application 10 test and application figure 5 test circuits for isolated testing the can bus substitute 1 is connected to the can transceiver (see figure 5 ). the capacitors c 1-2 simulate the cable. allowed minimum values of the termination resistors r rth and r rtl are 500 ? . electromagnetic interference on the bus lines is simulated by switching to can bus substitute 2. the waves of the applied transients will be in accordance with iso 7637 part 1, test 1, test pulses 1, 2, 3a and 3b. rth rtl canh canl gnd v cc v bat rxd nerr txd ent wake nstb inh tle 6252 can transceiver 14 13 12 11 10 9 8 73 654 21 r 1 1 r c 1 1 cc 2 20 pf can bus substitute 1 1 r r 1 schaffner generator c k c k r 1 c 1,2 c k = 100 ? = 10 nf = 1 nf can bus substitute 2 + 5 v aes02423 + 12 v
preliminary data tle 6254 test and application data sheet version 1.2 22 2001-12-12 figure 6 application circuit v cc wk gnd canh canl rth rtl can bus 7 tle 6254 g 11 12 8 9 gnd p with on-chip can- module nerr txd ent rxd nstb 6 2 4 3 5 10 k 100 nf 100 nf gnd e.g. c50c, c164c e.g. tle 4263 tle 4299 tle 4271 tle 4276 v s v cc v s 14 v bat 22 f 100 nf 22 f r rth r rtl 10 inh inh 1 *) optional, according to car manufacturers requirements choke *)
data sheet version 1.2 23 2001-12-12 preliminary data tle 6254 package outlines 11 package outlines p-dso-14-13 (plastic dual small outline package) gps09330 sorts of packing package outlines for tubes, trays etc. are contained in our data book ? package information ? dimensions in mm smd = surface mounted device
data sheet version 1.2 24 2001-12-12 preliminary data tle 6254 edition 2001-12-12 published by infineon technologies ag, st.-martin-strasse 53, d-81541 mnchen, germany ? infineon technologies ag 2001. all rights reserved. attention please! the information herein is given to describe certain components and shall not be consid- ered as warranted characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descrip- tions and charts stated herein. infineon technologies is an approved cecc manufacturer. information for further information on technology, deliv- ery terms and conditions and prices please contact your nearest infineon technologies office in germany or our infineon technolo- gies representatives worldwide (see ad- dress list). warnings due to technical requirements components may contain dangerous substances. for in- formation on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the fail- ure of that life-support device or system, or to affect the safety or effectiveness of that de- vice or system. life support devices or sys- tems are intended to be implanted in the hu- man body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

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