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E.P. de Ingeniería de Gijón                                                                                                                           28th October 2013  Power Systems in hybrid and electric vehicles (PSHV)                Master Energy Conversion & Electrical Power System  Student Name:_________________________________________________________________________________  QUESTION 1 The mailbox 1 in the CAN module of a TMS320F28335 is programmed and enabled as a reception mailbox and the Message Identifier Register and the Local Acceptance Mask register are programmed according to the following lines: ECanaMboxes.MBOX1.MSGID.bit.STDMSGID = 0x7EF; //standard identifier ECanaMboxes.MBOX1.MSGID.bit.IDE = 1; ECanaMboxes.MBOX1.MSGID.bit.AME = 1; //to filter and mask messages ECanaLAMRegs.LAM1.all =0x003C0000; Which are the identifiers of the CAN frames that can be received using this mailbox? QUESTION 2 Read each statement below carefully. Place a T on the line if you think a statement is TRUE. Place an F on the line if you think the statement is FALSE. • _____ The TRS bit of every mailbox in the CAN Transmission Set register (CANTRS) of a TMS320F28335 must be set to start a transmission of the corresponding mailbox is cleared by the CAN module after a successful transmission. • _____ If a Node reach the Error Active State, the node is separated from the CAN network and neither transmission nor receive of messages is allowed for this node. QUESTION 3 Explain briefly. Why the LIN bus is a cross between I2C and RS232?

QUESTION 4 In the following figure, fill in the proper order the different fields that comprise a LIN data frame: Synchronization sequence, Identifier Field, Synchronization Break Field, Data Bytes & Checksum.

E.P. de Ingeniería de Gijón                                                                                                                           28th October 2013  Power Systems in hybrid and electric vehicles (PSHV)                Master Energy Conversion & Electrical Power System  Student Name:_________________________________________________________________________________  QUESTION 5 Using arrows, attach the following statements with the appropriate implementation of CAN bus that corresponds. The Nominal Voltage for a Dominant Bit in a CANH line is 3.5 Volts ◊ The nominal Voltage for a recessive bit en a ◊ FT LS CAN – ISO 11898-3 CANL line is 5 Volts ◊ The CANH Voltage Range in a recessive bit is < 1.6 Volts ◊ The Nominal Voltage for a Dominant Bit in a ◊ HS CAN – ISO 11898-2 CANH line is 4 Volts ◊ The differential Voltage range (CANH-CANL) for a dominant bit is: 2.2 – 5 Volts ◊ The differential Voltage range (CANH-CANL) ◊ SW CAN – SAE J2411 for a recessive bit is: -1.0 – 0.5 Volts ◊ QUESTION 6 Explain briefly. Which is the main drawback of galvanic isolation CAN wire Links?

QUESTION 7 Remember the rule of thumb given by Infineon. Up to which current (mA) you can use a linear voltage regulator to supply a typical automotive system? QUESTION 8 Choose the right answer. The early warning function has an extra input to monitor that a voltage is not below a threshold voltage which will activate the output pin used to warn the microcontroller of this event. Which is the source for the voltage of this extra pin? a) A resistor divider connected to the output voltage of the regulator b) A resistor divider connected to the input battery voltage c) A pulse output generated by the main microcontroller of the system QUESTION 9 Which are the four phenomena that are tried to simulate for the conducted immunity tests in automotive electronics?

QUESTION 10 Write 5 protective device/circuit options to provide EMI and ESD protection to a CAN transceiver.