CAN HS Wake Up - C&S group GmbH
Contents
1. Reliability It is strongly required to activate the INH signal usually voltage regulator just by passing additional plausible test E g the INH may be activated only if a wake up event has been recognised activation of the Figure 3 INH planed N activation of wake up source INH proposal to illustrate the recognised ai increased reliability CAN_HS PL Req_12 doc Saved on 1 10 02 Page 8 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd 1 4 Compatibility 1 4 1 Interoperability Each vehicle manufacturer has different interoperability requirements In the worst case the following bus drivers will be used in any combination e CAN high speed according the state of the art connected to the ignition each supplier e CAN high speed according the state of the art connected to permanent power each supplier e new CAN high speed connected to the ignition each supplier e new CAN high speed connected to permanent power each supplier The functions of the poorest bus driver must be supported in any combination 1 4 2 2 Source e 2 source is strongly required e 100 pin compliant e 100 function compliant if following a user manual specific to each supplier 1 4 3 Line Levels e compliant to the known ISO 11898 high speed during communication gt common mode level of 2 5 V e The levels of CAN_H and CAN L have to be symmetrical against the termination voltage 2 5 V during dominant states the2. emission Table 2 pins their function and their protection 1 13 Fail Silence The communication via the bus lines may not be disturbed by any faulty ECU 1 13 1 Tx permanent dominant A permanent dominant Tx level may not disturb the communication via the bus lines gt recognise gt handle by de activation of the output stage after min 200us recovery by the uC gt signal 1 13 2 Rx permanent recessive A permanent recessive Rx level if sending a message at Tx while the Rx Pins stucks to recessive may not disturb the communication via the bus lines gt recognise CAN_HS PL Req_12 doc Saved on 1 10 02 Page 13 of 17 GIFT ICT High Speed CAN Requirements 1 2 _ SSS se gt handle by de activation of the output stage gt signal 1 13 3 Reverse Current Not any reverse current is allowed independent from the operation mode incl if being not powered gt Reverse leakage current on CAN H and CAN L under the condition Vcc connected to GND should be at most 50 uA at 2 5V Target 0 WA Examples e an ECU has a broken ground connection gt the transceiver will float to the battery voltage gt not any reverse current e g to the bus is allowed e no reverse current from WU gt VCC 2 Confirmed Behaviour 2 1 Wake Up via the Bus e the transceiver will be waked up by messages on the bus gt predefined order of 0 and 1 gt independent from the chosen baud rate e the
3. bus lines are monitored by a differential mode comparator gt common mode range 30 40 V gt any voltage outside the range common mode range 30 40 V may not wake gt amplitude de modulator will be avoided e each bus line has its own low pass filter regarding ground 2 2 Termination during the Power Down Mode of the Bus e each internal source will be passive gt termination to ground gt each wake up will produce a common mode signal CAN_HS PL Req_12 doc Saved on 1 10 02 Page 14 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd 2 3 States being transmitted to the pC e battery failure BatFail e temperature pre warning e bus line failures gt which support perfect communication gt CAN H to VCC or to the battery gt CAN Lto Gnd gt the recognised failure will be recovered so that the uC is able to recognise the failure by each interrupt an the end of a message e Tx permanently dominant e Rx permanently recessive e Tx permanently short circuit to Rx no Distinction of the wake up sources e bus wake up will be signalled by the pins ERR and RxD e a WU wake up will be signalled by the pin ERR Transmission to the uC e the states will be transmitted by the pin ERR to the uC 2 4 Pin Out P Ed a SO 14 Mire GND Su VCC ih CANL RxD LN VR F VSPLIT VCCHC VCCIO ma VBat EN ma WU INH a ERR power supply CAN HS PL Req_12 doc Saved on 1 10 02 Fi
4. slew rates should be symmetrical within a tolerable difference of at least 10 e additional optional new levels are allowed 1 4 4 Termination e to guarantee the interoperability to the ISO 11898 the bus lines have to be terminated to a fixed voltage 2 5 V e the bus lines has to be terminated to ground during low power mode e if not powered LowBat the termination to ground has to be high impedence 500 kQ see also 1 13 3 Reverse Current CAN_HS PL Req_12 doc Saved on 1 10 02 Page 9 of 17 GIFT ICT High Speed CAN Requirements 1 2 e several termination concepts has to be allowed confirmed to the physically boundary conditions gt termination at the end of the transitions lines VSPLIT connection optionally gt central termination in a star gt distributed termination 1 5 Quiescence Current e typically 20 A very high priority wake up is monitored 1 6 EMC e the transceiver has to work with and without a common mode choke e EMC target specification see GIFT ICT activities 1 6 1 Electromagnetic Emission EME e the results of the high speed transceivers according the state of the art has to be met at least without common mode coil e the emission should be independent from any ground shift in a networked system 1 6 2 Electromagnetic Immunity EMI e the results of the high speed transceivers according the state of the art has to be met at least 1 6 3 ESD e at least 4 kV human body mod
5. 7 RE permanent IES dt a a E a i SS 13 E A E eee eg ae 14 2 Confirmed VIE SAS AA ARS 14 2A Wake Up via the A NO 14 2 2 Termination during the Power Down Mode of the BUS 0oooconccnoccnoconoconncooncnnnnonanncconacononononos 14 2 3 States being transmitted to the Ml ll 15 ZA Pin or ls A 15 A A O A A een Gearon 16 RIAL O 16 DSZ a A Oe dal 16 32 COS TO 17 A 17 Se SOT uba Orio A lo 17 is MANE ON 17 CAN_HS PL Req_12 doc Saved on 1 10 02 Page 2 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd CAN_HS PL Req_12 doc Saved on 1 10 02 Page 3 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd 1 Requirements 1 1 Task CAN high speed Transceiver to be connected to permanent power 1 2 Basic Requirements e Compliant to a 42 V permanent power system e Compliant to a 12 V permanent power system e operation cycle of a vehicle gt 5000h 5 V are available e live cycle of a vehicle gt 15 years permanently connected to the battery e critical application 150 C ambient duration 25 h e ambient temperature gt heat sink 40 C to 125 C e heat resistor Junction heat sink TBD e state of the art correct operation junction temperature to at least 150 C test 90000h at 150 C 10 C more will halve the operating duration e baudrate 100kBit s to 1MBit s e length of the transmission lines at 1MBit s about 10m e the number of ECUs is not important for the bus driver e loop time max 260ns Target should be 225ns
6. High Speed CAN Specification Requirements Vehicle Manufacturers Date 23 09 02 10 06 Version 1 2 Audi AG DaimlerChrysler AG VW Infineon Motorola Philips TZ Microelectronic confirmed with BMW AG PSA ST Microelectronics c amp s group File CAN_HS_PL Req_12 doc printed 01 10 02 10 40 CAN GIFT ICT High Speed CAN Requirements 1 2 se Table of contents High Speed CAN Reem ene gene aT eee Ome al 1 V REQUIERA ARAG 4 LALA a e TE 4 1 2 Basic Re QUItEMEntsS vs nd taci n 4 Md diia 6 13A ON 7 3 2 OE 7 VS A nade aca ces pep oed eset rae E aaa oar 7 A A 8 1 307 WakeUp Detecllos 8 1 3 5 1 Control Pin to the Voltage Regulator very high priority ooooonnccnnncnnncononnconcnonnnos 8 LAS COMPAS caba 9 e A wat a E tect Gath tants asia e a ak 9 A 8 lel ane Nara E am E EETA 9 143 Eime Levels hafet ae nec oueteea E O ocas atau E A usta Sct tates us 9 Meme ci ce 100 Cogn A A A AS ASS 9 A ENCE CATT CIN ay tas ahead acca A Se E cas ee a Allene 10 VG EMI nai A pentecee tela adasdacta aiia 10 1 6 1 Electromagnetic Emission EMEP ics can utenti aastitee uracteetebaleasseenunad 10 1 6 2 Electromagnetic Immunity EMD sario iii lada uo cad 10 So 10 TLC SII Est A a Aas a 10 LSO With 42 en e ed csi 10 SS A T 11 1 10 Interface Bus Driver amp gt Uli ta eas 11 TT Oto Wake Up RO 11 1 11 Dias IS tn ds 11 1 12 A e A E E a Meee ees 12 1 13 A ea EEE EE sr E A ew wom ede 13 LASA Tx permanent IMA E A AAA AAA 13 113 2
7. SPLIT passive recessive termination active to GND 1 3 3 Sleep CAN driver not active INH passive usually voltage regulator not active VSPLIT passive recessive termination active to ground CAN_HS PL Req_12 doc Saved on 1 10 02 Page 7 of 17 GIFT ICT High Speed CAN Requirements 1 2 SSS SS SSS 22222222 1 3 4 Transitions The operation modes must be influenced by e at least one control pin gt controlled by the uC gt controlled by any signal intern or extern the ECU it is required to connect an ECU external wake up signal to the bus driver e signals from the bus standard messages or additional signals or levels e fail silent behaviour 1 3 5 Wake Up Detection A wake up via the bus lines has to meet some requirements e a predefined row of 0 and 1 must be necessary to wake up example 500 kBit s rddxxx 1 MBit s rddddxxx hint the wake up procedure has to meet the EMC requirements e independent from the baud rate e nearly each valid message should be able to wake up the transceiver e the wake up filter must ignore any common mode voltage on the bus lines e the common mode range of the wake up filter must be at least 35 V e passing the allowed common mode range may never wake up the circuit e the wake up circuit may never behave like a amplitude de modulator 1 3 5 1 Control Pin to the Voltage Regulator very high priority Any voltage regulator must be controlled by the bus driver
8. are terminated to support the power down mode of the network EU ee ere eee Electronic Control Unit A tans Power down mode of the bus driver the external voltage regulator is not activated by the bus driver TD clio to be defined A A Micro Controller A A Micro Controller 5 Historie Version Date Authors Remarks 0 4 J rgen Minuth JM translation of version 0 3C into English Sven Fluhrer SF Andreas Gress AG Rainer H gele RH 0 5 17 08 00 JM integrated results from several meeting to be confirmed among the chip suppliers 0 6 4 10 00 JM Updated pin out and pin behaviour introducing the 42 V requirement 0 7 20 02 02 SF Update state transition chart 1 0 10 4 02 SF JM final review based on feedback from Audi VW Dietmar Ostowski DO Infineon Motorola and Philips Oliver Richter OR 1 1 17 07 02 OR DO integrated results from GIFT Meeting 28 05 02 1 1b 03 09 02 DO SF integrated results from GIFT Meeting 21 08 02 1 2 23 09 02 DO OR integrated feedback from GIFT Members CAN_HS PL Req_12 doc Saved on 1 10 02 Page 17 of 17
9. at 1MBit s at least 30 ECU has to be supported loop time transceiver delay from TX edge gt Bus gt RX edge Conditions CRx 20 pF CCANH GND CCANL GND 100 pF Regus 600 CAN_HS PL Req_12 doc Saved on 1 10 02 Page 4 of 17 GIFT ICT High Speed CAN Requirements 1 2 System operating behavior Si Vota oto YT pon ane a Supply Voltage VBat MIA 7 V no function required neglectable input current Supply voltage pet ot whole operating functions Supply voltage VBat 42 58 reduced operating functions due to e g thermal protection any irreversible damage of the transceiver and of any connected module has to be avoided Supply voltage VBat Any damage of the transceiver or of any connected module has not to be avoided Any destruction of connected ECU via the bus should be avoided Table 1 proposal for the operation conditions the self protecting mechanisms of the transceiver are active and may influence its behaviour CAN_HS PL Req_12 doc Saved on 1 10 02 Page 5 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd 1 3 Modes Reset actions finished gt i StandBy x Be Y y fe N StandBy N A Normal eA R 7X veC on AND VCC not ok for longer than 5 ms x Operating i NormalBat BAT lt threshold A A J PowerOn Vbat lt 3 0 V P Vbat gt 4 7 V A AE PowerOff q Figure 1 proposed simplified state transition char
10. el looking to the integrated circuit e pins see table 1 1 7 Ground Shift e the results of the high speed transceivers according the state of the art has to be met at least 1 8 Systems with 42 V It is required to use the bus drivers inside vehicles with a 12 V and a 42 V permanent power 5 worst case 50 LA 8 kV should be reached 7 perfect communication during a jump start is required 27 V DC in a 12 V permanent power system CAN_HS PL Req_12 doc Saved on 1 10 02 Page 10 of 17 GIFT ICT High Speed CAN Requirements 1 2 _ SS sss What can be expected in systems with 42 V e 58 V DC at the permanent power pin e 58V DC at the bus pins e 58V DC at Wake up pins Hint e The vehicle manufacturers expect that the standard 58V process will fit the requirements the next few years 1 9 System e ECUs connected to the ignition and to permanent power 12 V and or 42 V must work together at one net e sub net operation by RxOnly possible gt a bypass during RxOnly Tx gt Rx should not be implemented 1 10 Interface Bus Driver uC e uC supply voltage standards must be connectable e g 3 V 2 5 V 1 8 V e 100 compatible among every supplier 1 10 1 Wake Up Sources each wake up event has to be signalled the wake up sources must be transparent to the uC 1 11 Diagnosis The errors has to be recognised by the bus driver and has to be signalled to the uC e each bus line error e g sh
11. gure 5 confirmed pin out based on a pin FMEA done by a chip supplier internally Page 15 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd 2 5 Pins 2 5 1 Circuits Wake Up e pull up if the voltage at the WU is higher than the threshold pull down if the voltage at WA is lower than the threshold or pull up to UBat current limit lt 104A external pull up resistor recommended 2 level sensitivity threshold gt 5 V e g 6 5119 if the static level is used threshold lt 5 V if edges are used e interference comparable to the bus line wake up circuit RX e standard CMOS output stage without tri state TX e pull up resistor approx 20kQ NERR e low side switch e pull up resistor to VCCuC approx 50kQ e ora weak high side switch SB e pull down resistor e approx 20kQ EN e pull down resistor e approx 20kQ INH e pull up RDS to UBat e approx 3kQ e current limit approx 180uA e comparable to the low speed implementation 2 5 2 Vref e Behaviour TBD gt source and sink proposed 10 the threshold gt 5V was chosen to handle a short circuit between WU and ERR CAN_HS PL Req_12 doc Saved on 1 10 02 Page 16 of 17 GIFT ICT High Speed CAN Requirements 1 2 Cd gt source gt sink 3 Glossary BattFail S The bus driver has been disconnected from the power lines Normal The bus interface is in the running mode S fal DVss lt istnsuleniavspaciiaesena The bus line outputs
12. ort circuit to 5 V which can be detected by a well designed transceiver e TX permanent dominant the output state has to be switched off 8 bus wake up permanent power 9 the errors should be distinguished CAN_HS PL Req_12 doc Saved on 1 10 02 Page 11 of 17 GIFT ICT High Speed CAN Requirements 1 2 _ ee ee e RX permanent recessive the output stage has to be switched off e RX short circuit to TX e over temperature e Bat Fail de connection of the battery e wrong bus levels e etc 1 12 Pin Out e It is proposed to choose a pinning package SO14 to allow the usage of high speed bus drivers according the state or the art package SO8 e any short circuit between two neighbour pins may not block the communication e the pins should be arranged looking to optimised pcb layouts SO 14 Figure 4 TxD me SO8 8 mm STB proposal for the pinning GND EE Eu CANH VCC mm E CANL RxD mm 4 mu VREF m m 7 CAN_HS PL Req_12 doc Saved on 1 10 02 Page 12 of 17 GIFT ICT High Speed CAN Requirements 1 2 bus line CAN high fully protected ESD EMC radiation emission bus line CAN low fully protected ESD EMC radiation emission average voltage at the bus fully protected ESD EMC radiation emission permanent power fully protected ESD EMC radiation emission control the voltage regulator control the operating mode wake up fully protected ESD EMC radiation
13. t the fail silent behaviour has to be taken into account CAN_HS PL Req_12 doc Saved on 1 10 02 Page 6 of 17 GIFT ICT High Speed CAN Requirements 1 2 BusNormal Mode order PES a RxITx HighTemp bus driver Mode order or enabled and TX perm dom KK S NormalVoltage SE y r l and junction temperature Z XN RX pemn rez NormalBat LowTemp lt 140 C 20 C RxOnly uring transeive J Output driver LowTem disabled or p DO a o TX rez junction temperature ra N p e eae RX reseive dom gt 140 C 20 C N Mode order or gt MedTemp junction temperature NN ye Mode order N gt 170 C 20 C E ES or Low Voltage TermGND or J a LowBat Sele Ss X junction temperature ey tao a A lt 170 C 20 C ie HighTem e BusLowPower 9 P HA SA FPN Vbat gt 47 V Zi Businit Power off high impedance Vbat lt 3 0 V wf Figure2 proposed simplified termination state transition chart the fail silent behaviour has to be taken into account 1 3 1 Normal e CAN driver active e INH active usually voltage regulator active e VSPLIT active e recessive termination active 2 5V Hint e the mode RxOnly with an active receiver and an passive driver is hidden inside Normal 1 3 2 StandBy CAN driver not active INH active usually voltage regulator active V
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