NCV7383GEVK

NCV73830V1GEVB NCV7383 FlexRay) Bus Driver Evaluation Board User's Manual Introduction http://onsemi.com This document describes the NCV7383EVB Evaluation board for the ON Semiconductor NCV7383 FlexRay Bus Driver. The functionality and major parameters can be evaluated with the NCV7383EVB board. The NCV7383 is a single-channel FlexRay bus driver compliant with the FlexRay Electrical Physical Layer Specification Version 3.0.1, capable of communicating at speeds of up to 10 Mb/s. It provides differential transmit and receive capability between a wired FlexRay communication medium on one side and a protocol controller and a host on the other side. NCV7383 mode control functionality is optimized for nodes without the need of extended power management provided by transceivers with permanent connection to the car battery as is on NCV7381. NCV7383 is primarily intended for nodes switched off by ignition. Additional details can be found in the NCV7383 datasheet. EVAL BOARD USER’S MANUAL allows users immediately start with the NCV7383 FlexRay Bus Driver. The MCU is preprogrammed with a firmware which provides simple mode control and FlexRay communication. With use of Freescalet BDM programmer and a suitable development environment, the MCU firmware can be freely modified and reprogrammed. 1 VIO VCC TxD BP TxEN BM RxD GND BGE ERRN STBN CSN SCK SDO Figure 2. NCV7383 Pin Connections Board Hardware The board consists of MCU with integrated 2-channel FlexRay communication controller interconnected with two separate FlexRay bus drivers (NCV7383), two voltage regulators and peripherals. The board is prepared for various modifications in power supply concept and FlexRay bus termination, and allows simple extension of the system by unused MCU pins. USB interface provides compatibility with standard PC. The address of each board can be easily modified by address switch what allows to create complex FlexRay network without the need of reprogramming the MCU. Implemented High Speed CAN interface can be used as a diagnostic interface in a network built from several nodes. For evaluation purposes NCV7383 is populated with several LED diodes and most of the bus driver signals are comfortable accessible to oscilloscope probes. Figure 1. Evaluation Board Photo The NCV7383EVB Evaluation board is a reference design for stand-alone 2−channel FlexRay node. The board is intended to give designers easy, quick and convenient means for evaluation of NCV7383 FlexRay bus drivers. The design incorporates complete node solution with possibility of modifications and small board size. A set of two boards © Semiconductor Components Industries, LLC, 2013 July, 2013 − Rev. 1 1 Publication Order Number: EVBUM2172/D NCV73830V1GEVB GENERAL FEATURES • All NCV7383 digital I/O pins connected to test points – FlexRay Transceiver • Two separate FlexRay channels with NCV7383 Bus • • • easy connection to Logic Analyzer Driver compliant with the FlexRay Electrical Physical Layer Specification Version 3.0.1, Reconfigurable bus termination – End node / Middle node Common mode Choke and additional ESD protection footprint SUBD-9 connectors – FlexRay bus • 8 general purpose LEDs • Address switch • External Interrupt switch Other • Two Automotive Voltage regulators (Input battery voltage up to 42 V) • Power supplies voltage monitoring • Instant 2-nodes FlexRay network with running MCU • Freescalet 16-bit MC9S12XF family MCU • Integrated FlexRay Communication Controller communication by connecting two NCV7383 EVBs. • PC configuration software under development (Protocol Specification Rev. 2.1) (available upon request) • Integrated CAN 2.0 A, B Controller • Background Debug Module – single-wire • • • • PCB Layout • The FlexRay transceiver, the ESD protection and the communication with host development system 512 k byte Flash 32 k byte RAM 50 MHz maximum CPU bus frequency Relatively small 112-pin LQFP package • • Peripherals • • Optical isolated USB interface (USB to UART converter) common mode choke are placed near to the FlexRay the ECU connector The FlexRay signal lines (BP, BM) are decoupled from disturbances on the ECU board The routing of the FlexRay lines (BP, BM, TxD and TxEN) is symmetric The distance between the lines BP and BM resp. TxD and TxEN is minimized • Additional CAN interface GETTING STARTED considered as Master Board. Node address is configured by address switch SW12 – see Address Switch for details. 4. Connect the boards according to Figure 3. Up to 5 boards with addresses 1 to 5 can be connected together. 5. Connect the oscilloscope to any test-point as needed. 6. When power supply is applied, MCU automatically configures the FlexRay Communication Controller setting based on the current node address and initiates FlexRay communication. The NCV7383EVB board is fully assembled, pre-programmed and can be immediately used for evaluation. Only a few steps need be proceeded to get fully working simple FlexRay network. Connect the evaluation boards as follows: 1. Set the boards to default configuration according to Jumpers and Default Configuration section. 2. Select one of the bus termination type (Bus Termination Configuration section) and adapt the respective devices. End node termination type is recommended for 2-node network. 3. Set a different board address on each board. One of the boards must be set with address 1 and is http://onsemi.com 2 NCV73830V1GEVB Figure 3. Basic NCV7383 Evaluation Board connection Power Modes • • Normal Mode LED Signaling The nodes can operate in two different power modes: Normal mode – all the nodes continuously communicates over the FlexRay bus. Standby mode – the communication is suspended. Both NCV7383 FlexRay transceivers are switched to Low Power Standby operating mode. Indication LEDs are switched off. The MCU is operating in low power STOP mode where the oscillator is stopped and the current consumption is substantially reduced. The properly running setup should signal following (Figure 4): Enter Standby Mode Sequence A transition to Standby mode can be initiated by the node with address 1: • Press and hold the Node1 #IRQ button for more than 3 seconds. The GO_TO_STANDBY signal is transmitted over the FlexRay bus. All the nodes then synchronously stop the communication and switch to Standby mode. Figure 4. LEDs Signaling Description • LED8 - LED4 • Wakeup Sequence The network operating in Standby mode can be woken-up by any node: • Press the #IRQ button on any node connected to the network. The MCU is woken-up from STOP mode by an external interrupt (#IRQ button pressed), resume operation in Normal mode and automatically wake up the rest of the network by the FlexRay Remote Wakeup Pattern sent over the bus. Once all the nodes are initialized, the FlexRay communication is restarted. • • Toggling LED signals data was received correctly in the particular slot (Slot 1 – Slot 5) LED3 Each node transmits its own #IRQ Button status (BTN_IRQ_DOWN signal). This LED signals that one of the nodes in the network detected the #IRQ button pressed. LED2 When the #IRQ button is pressed and held down, the LED2 is gradually decreasing intensity indicating the time remaining to ENTER STANDBY MODE event (100% to 0% in 2.4 seconds). LED1 LED1 changes intensity according to input battery voltage. ⋅ The LED intensity is directly proportional to the battery voltage in range of 10 V to 14V. http://onsemi.com 3 NCV73830V1GEVB ⋅ Battery voltage being below 10 V is indicated by LED1 OFF state. ⋅ Battery voltage exceeding 14 V is indicated by LED1 full intensity (Figure 5). Standby Mode LED Signaling In Standby mode, all the LEDs except LED8 are switched OFF. The LED8 is turned ON with very low intensity, signaling the MCU is correctly operating in the low power STOP mode and is ready to be woken-up. LED1 Intensity [%] FlexRay Communication Cycle Configuration 100% Cycle Length: 10000 us Number of Static Slots: 10 (5 slots active) Static Slot Length: 31 us Static Slot Payload Length: 6 Words Dynamic Segment: Not used Symbol Window Length: 14 us 0% 10 V FB20120813.01 VBAT [V] 14 V Figure 5. LED1 Intensity vs. Battery Voltage SLOT 1 2 3 4 5 Node 1 Tx Rx Rx Rx Rx Node 2 Rx Tx Rx Rx Rx Node 3 Rx Rx Tx Rx Rx Node 4 Rx Rx Rx Tx Rx Node 5 Rx Rx Rx Rx Tx Each node is assigned to one communication slot. The Slot number corresponds to particular Node address. 6 7 8 9 10 Static Segment Symbol Window 310 ms 14 ms NIT 9676 ms Figure 6. FlexRay Communication Cycle Configuration (Tx − Transmitter Buffer, Rx − Receive Buffer) http://onsemi.com 4 NCV73830V1GEVB BOARD OVERVIEW Basic Interface Figure 7. NCV7383EVB Connectors and Switches Legend: 9. BDM Connector (MCU debugging interface) 10. Power supply input connector 11. Aux digital I/O connector 12. CAN backbone connector 1 13. CAN backbone connector 2 14. USB interface 15. MCU Interrupt Request connector 16. Address switch 17. FlexRay CC Strobe output signals 1. Power supply input connector 2. Aux digital I/O connector 3. CAN backbone connector 1 4. CAN backbone connector 2 5. USB interface 6. MCU Interrupt Request connector 7. Address switch 8. FlexRay CC Strobe output signals Power Supply Input Connector signals can be also used as general Input / Output signals for debugging or other purposes. Power supply input socket. Plug diameter 2.1 mm, length 14 mm. Maximum input voltage 42 V (Limited by onboard voltage regulators input voltage range). Figure 8. Power Supply Input Connector Figure 9. Aux Digital I/O Connector Aux Digital I/O Connector CAN Backbone Connectors These pin header contains 8 auxiliary MCU signals – one complete SPI interface (4 pins), one UART interface (2 pins) and 2 signals connected to MCU ADC interface. These CAN backbone network is created as parallel connection of several boards. Each board contains two equivalent http://onsemi.com 5 NCV73830V1GEVB FlexRay BD Digital Signals Test Points Headers connectors in parallel, so whole network can be prepared using only simple point-to-point twisted pair. PCB1 PCB2 These headers are intended to be used as a test points for digital probes. Headers contain all FlexRay BD digital input and output signals. Test points for both FlexRay channel A and channel B are placed on separated headers (J73 – channel A, J83 – channel B). PCB3 Figure 10. CAN Backbone Connectors USB Interface Standard B type USB socket is used for connection to PC. USB interface is bus powered and electrically isolated from the rest of the board, so it is not possible to supply this board via USB. Figure 13. FlaxRay BD Digital Signals Test Points FlexRay BD Analog Signals Test Points FlexRay CC Strobe Output Signals The MCU FlexRay block provides a number of strobe signals for observing internal protocol timing related signals in the protocol engine. STB1 STB3 STB0 STB2 • • • • • • Figure 11. FlexRay CC Strobe Output Signals There are 6 analog test points on the board: BP – FlexRay Bus Plus terminal (Channel A) BM – FlexRay Bus Minus terminal (Channel A) VIO – Bus Driver VIO Power Supply input BP – FlexRay Bus Plus terminal (Channel B) BM – FlexRay Bus Minus terminal (Channel B) VCC – Bus Driver VCC Power Supply input FlexRay Bus Connectors FlexRay EPL Specification [2] does not prescribe certain connectors for FlexRay systems. Common used 9-pin D-Sub connectors were chosen as a suitable connector, whose electrical characteristics satisfy the specification. BDM Connector (MCU Debugging Interface) The BDM module provides a single-wire communication with host development system (Programming and debugging interface). BKGD GND NC RESET NC VCC Figure 12. BDM Connector Table 1. FLEXRAY CONNECTOR Pin # Signal Description Connection 1 - Reserved Not Connected 2 FR_BM BM bus line BM 3 FR_GND Ground GND 4 - Reserved Not Connected 5 - Reserved Not Connected 6 - Reserved Not Connected 7 FR_BP BP bus line BP 8 - Reserved Not Connected 9 (FR_Vbat) Optional FR external supply Main supply line NOTE: Connector Type: 9−pin D−sub (DIN 41652 or corresponding international standard), plug (male) http://onsemi.com 6 ESD Protection Yes (Optional) Yes (Optional) Yes NCV73830V1GEVB Jumpers and Default Configuration Figure 14. Jumpers and Soldering Straps Table 2. 2−PIN JUMPER Table 3. 3−PIN JUMPER Open 1 2 3 Open Closed Closed position 1−2 Closed position 2−3 http://onsemi.com 7 NCV73830V1GEVB Table 4. NCV7383 EVB JUMPERS CONFIGURATION Jumper J3 Function Bus Driver VIO supply Configuration Open Closed J4 Bus Driver VCC supply Bus Driver VIO connected to voltage regulator output Open Bus Driver VCC unsupplied Closed J40 CAN bus termination J52 General purpose LED Bus Driver VCC connected to voltage regulator output Open CAN bus without termination Closed J53 UART power supply J54 MCU output mcu_PP0 function J87 Channel B SCK pin connection J89 J75 J85 Channel B SDO pin connection Channel A Bus Driver digital input pull-ups Channel B Bus Driver digital input pull-ups Description Bus Driver VIO unsupplied LEDs Disabled Closed LEDs Enabled Open UART Disabled Closed UART Enabled Open LED D101 not used Closed SCK_B disconnected Closed 1-2 SCK_B connected to common hardware SPI interface Closed 2-3 SCK_B connected to separated software SPI interface Open SDO_B disconnected Closed 1-2 SDO_B connected to common hardware SPI interface Closed 2-3 SDO_B connected to separated software SPI interface Open TxEN, SCN and SCK pull-ups disconnected from VIO Closed Closed 5V – 5V_BD Closed Closed Open Closed LED D101 connected to PWM0 output Open Open Closed 3V3 – 3V3_BD CAN bus with 120 W termination Open Closed Default Closed 1-2 Closed 1-2 Closed TxEN, SCN and SCK pull-ups connected to VIO TxEN, SCN and SCK pull-ups disconnected from VIO Closed TxEN, SCN and SCK pull-ups connected to VIO Bus Termination Configuration Figure 15. FlexRay Bus Termination Assembly Drawing (R72, R82, C77, C87 placed on the BOTTOM side) http://onsemi.com 8 NCV73830V1GEVB BP FlexRay Bus Driver BUS BM C75 C85 C76 C86 R70 R80 R71 R81 R72 R82 C77 C87 Figure 16. FlexRay Bus Termination Connection (Channel A: R7x, C7x; Channel B: R8x, C8x) Table 5. FLEXRAY BUS TERMINATION CONFIGURATION AND PARAMETERS End node Middle node – Variant 1 Middle node – Variant 2 Component (Low-Ohmic termination) (High-Ohmic termination) (Custom termination) Ch. A: C75, C76 Ch. B: C85, C86 Short Short 100 pF Ch. A: R70, R71 Ch. B: R80, R81 47 W 1300 W 24 W Ch. A: R72 Ch. B: R82 Not Assembled Not Assembled 47 W Ch. A: C77 Ch. B: C87 4.7 nF 4.7 nF 4.7 pF Switches and Pushbuttons Figure 17. Switches Description • SW10...MCU Reset button • SW11...MCU External interrupt button • SW12...8-way DIP switch. The function depends on the MCU program. As default it is used for setting a node address. http://onsemi.com 9 NCV73830V1GEVB ⋅ The switch configuration shown in this figure means binary 0b00000010 (Node address is set to 2). Address Switch This switch is used for setting a node number. Each board is programmed with the same firmware, so every node in the network must be configured with different unique number. Be careful: MCU Reset Button This button is connected directly to MCU RESET pin. 0123456 7 MCU External Interrupt Button The MCU interrupt module support one maskable interrupt input. This input is connected to SW11. LEDs Figure 18. Address Switch Three power LEDs indicate proper function of voltage regulators. In case the MCU and the NCV7381 bus drivers IO cells use the same power supply (as by default) MCU VCC LED and BD VIO LED signalling is also the same. The board contains a bank of eight general purpose LEDs (Green). Their function depends on the MCU program. There is also USB indication LED which is used to signal ongoing USB data transmission. ⋅ LSB is situated on the left. ⋅ ON means the particular switch is closed and output is Logical 0! ⋅ OFF means the particular switch is open and output is Logical 1! Figure 19. LEDs Description http://onsemi.com 10 NCV73830V1GEVB BLOCK DIAGRAM PROGRAMMING/ DEBUG INTERFACE CAN BACKBONE USB INTERFACE SWITCHES CLOCK LED’s MCU EXTERNAL RESET MC9S12XF512MLM POWER SUPPLIES FlexRay CC A AUX I/O PINS FlexRay CC AUX OUTPUTS FlexRay CC B MCU & FR BD IO VIO 3V3 FR BD VCC VCC 5V NCV7383 FlexRay BD A NCV7383 FlexRay BD B PASSIVE NETWORK PASSIVE NETWORK FlexRay CONNECTOR FlexRay CONNECTOR Figure 20. NCV7383 Evaluation Board Block Diagram NCV7383 TYPICAL APPLICATION DIAGRAM IN VIO reg. VCC reg. OUT OUT CVIO VIO FlexRay Communication Controller TxD TxEN RxD Bus Guardian BGE Host Interface STBN ERRN SPI CVCC VCC NCV7383 CMC BP BP BM BM CSN SCK SDO RBUS1 MCU VBAT IN GND RBUS2 ECU CBUS FB20110411.12 Figure 21. NCV7383 FlexRay Bus Driver Typical Application Diagram http://onsemi.com 11 GND NCV73830V1GEVB Table 6. RECOMMENDED EXTERNAL COMPONENTS FOR THE APPLICATION DIAGRAM Component Function Min. Typ. Max. Unit Note CVCC Decoupling capacitor on VCC supply line, ceramic 100 nF CVIO Decoupling capacitor on VIO supply line, ceramic 100 nF RBUS1 Bus termination resistor 47.5 W (1) RBUS2 Bus termination resistor 47.5 W (1) CBUS Common-mode stabilizing capacitor, ceramic 4.7 nF (2) CMC Common-mode choke 100 mH 1. Tolerance ±1%, type 0805. The value RBUS1 + RBUS2 should match the nominal cable impedance. 2. Tolerance ±20%, type 0805. SPECIFICATIONS Power Supply The Evaluation board can be powered either via DC power supply input socket with plug diameter 2.1 mm and length 14 mm or by one of the FlexRay bus connectors (See the connector description Table 1). Maximum input voltage (42 V) is limited by on-board voltage regulators input voltage range. Split Termination In order to achieve a better EMC performance, it is recommended to make use of a so-called split termination in all ECUs, where the Termination resistance RT is split into two equal parts RTA and RTB [2]. Figure 22. ECU with Split Termination [2] The serial RC combination (R1; C1) at the centre tap of the split termination provides a termination to GND for common mode signals. R1 is preferably omitted. Typical values are given in the following table: Table 7. TERMINATION PARAMETERS Typ Units R1 Name Resistor Description < 10 W C1 Capacitor 4700 pF 2 × |RTA - RTB| / (RTA + RTB) Matching of termination resistors ≤2 % For RTA and RTB the use of 1% tolerated resistors leads to a matching of 2%. The better the matching of the split termination resistors RTA and RTB, the lower the electromagnetic emission. BP FlexRay Bus Driver Standard Termination BUS BM RTA Recommended bus split termination is shown in the Figure 23. Considering passive network, without active stars, proper termination should be applied at the two nodes that have the maximum electrical distance on the bus. The sum of termination resistors values should match the nominal cable impedance. At other nodes a high-ohmic split termination should be applied. RTB C1 Figure 23. Basic Split Termination http://onsemi.com 12 NCV73830V1GEVB Table 8. BASIC SPLIT TERMINATION PARAMETERS Value Name Description RTA, RTB Termination resistors C1 Capacitor End node Middle node Units 47 1300 W 4700 4700 pF Custom Termination BP In some cases a specific termination topology is required for middle modes. Such a termination connection and typical values are shown in Figure 25 and Table 9. FlexRay Bus Driver BUS BM CMC BP FlexRay Bus Driver BUS BM RTA CTA CTB RTA RTB RTB R1 C1 C1 Figure 25. Middle Node Split Termination Figure 24. End Node Split Termination Table 9. CUSTOM SPLIT TERMINATION PARAMETERS Value Name Description End node Middle node Units 47 24 W 4700 4.7 pF RTA, RTB Termination resistors C1 Capacitor R1 Resistor − 47 W CTA, CTB Termination capacitors − 100 pF Common Mode Choke choke represents high impedance for common mode signals. The parasitic stray inductance should be as low as possible in order to keep oscillations on the bus low. The common mode choke is placed between transceiver and split termination [2]. A common mode choke is used to improve the emission and immunity performance. The function of the common mode choke is to force the current in both signal wires to be of the same strength, but opposite direction. Therefore, the Figure 26. ECU with Split Termination and Common Mode Choke [2] http://onsemi.com 13 NCV73830V1GEVB Table 10. COMMON−MODE CHOKE REQUIREMENTS [2] Name Description Typ Units ≤1 W Main inductance ≥ 100 mH Stray inductance