ON Semiconductor NCV73830V1GEVB User manual

©Semiconductor Components Industries, LLC, 2013
July, 2013 −Rev. 1
1Publication Order Number:
EVBUM2172/D
NCV73830V1GEVB
NCV7383 FlexRay)Bus
Driver Evaluation Board
User's Manual
Introduction
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.
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
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 FreescaletBDM programmer
and a suitable development environment, the MCU
firmware can be freely modified and reprogrammed.
Figure 2. NCV7383 Pin Connections
BP
BM
GND
SDO
VCC
ERRN
CSN
SCK
VIO
TxD
TxEN
RxD
BGE
STBN
1
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.
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GENERAL FEATURES
FlexRay Transceiver
•Two separate FlexRay channels with NCV7383 Bus
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
MCU
•Freescalet16-bit MC9S12XF family MCU
•Integrated FlexRay Communication Controller
(Protocol Specification Rev. 2.1)
•Integrated CAN 2.0 A, B Controller
•Background Debug Module – single-wire
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)
•Additional CAN interface
•All NCV7383 digital I/O pins connected to test points –
easy connection to Logic Analyzer
•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
communication by connecting two NCV7383 EVBs.
•PC configuration software under development
(available upon request)
PCB Layout
•The FlexRay transceiver, the ESD protection and the
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
GETTING STARTED
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
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.
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Figure 3. Basic NCV7383 Evaluation Board connection
Power Modes
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.
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.
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.
Normal Mode LED Signaling
The properly running setup should signal following
(Figure 4):
Figure 4. LEDs Signaling Description
•LED8 - LED4 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.
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⋅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).
Figure 5. LED1 Intensity vs. Battery Voltage
FB20120813.01
100%
LED1 Intensity [%]
0%
VBAT [V]
10 V 14 V
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.
FlexRay Communication Cycle Configuration
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
Each node is assigned to one communication slot. The
Slot number corresponds to particular Node address.
Figure 6. FlexRay Communication Cycle Configuration (Tx −Transmitter Buffer, Rx −Receive Buffer)
NIT
Tx
Tx
Rx
Rx
Rx
Rx
Rx
Tx
Tx
Tx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx
Rx Rx
Rx
12345678910
Node 1
Node 2
Node 3
Node 4
Node 5
Static Segment Symbol
Window
SLOT
310 ms 14 ms 9676 ms
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BOARD OVERVIEW
Basic Interface
Figure 7. NCV7383EVB Connectors and Switches
Legend:
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
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
Power Supply Input Connector
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
Aux Digital I/O Connector
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
signals can be also used as general Input / Output signals for
debugging or other purposes.
Figure 9. Aux Digital I/O Connector
CAN Backbone Connectors
CAN backbone network is created as parallel connection
of several boards. Each board contains two equivalent
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connectors in parallel, so whole network can be prepared
using only simple point-to-point twisted pair.
Figure 10. CAN Backbone Connectors
PCB1 PCB2 PCB3
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.
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.
Figure 11. FlexRay CC Strobe Output Signals
STB3
STB2
STB1
STB0
BDM Connector (MCU Debugging Interface)
The BDM module provides a single-wire communication
with host development system (Programming and
debugging interface).
Figure 12. BDM Connector
GND
RESET
VCC
GND
NC
NC
BKGD
FlexRay BD Digital Signals Test Points Headers
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).
Figure 13. FlaxRay BD Digital Signals Test Points
FlexRay BD Analog Signals Test Points
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.
Table 1. FLEXRAY CONNECTOR
Pin # Signal Description Connection ESD Protection
1 - Reserved Not Connected
2 FR_BM BM bus line BM Yes (Optional)
3 FR_GND Ground GND
4 - Reserved Not Connected
5 - Reserved Not Connected
6 - Reserved Not Connected
7 FR_BP BP bus line BP Yes (Optional)
8 - Reserved Not Connected
9 (FR_Vbat) Optional FR external supply Main supply line Yes
NOTE: Connector Type: 9−pin D−sub (DIN 41652 or corresponding international standard), plug (male)
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Jumpers and Default Configuration
Figure 14. Jumpers and Soldering Straps
Table 2. 2−PIN JUMPER
Open
Closed
Table 3. 3−PIN JUMPER
1 2 3
Open
Closed position 1−2
Closed position 2−3
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Table 4. NCV7383 EVB JUMPERS CONFIGURATION
Jumper Function Configuration Description Default
J3 Bus Driver VIO supply Open Bus Driver VIO unsupplied Closed
3V3 – 3V3_BD
Closed Bus Driver VIO connected to voltage regulator output
J4 Bus Driver VCC supply Open Bus Driver VCC unsupplied Closed
5V – 5V_BD
Closed Bus Driver VCC connected to voltage regulator output
J40 CAN bus termination Open CAN bus without termination Closed
Closed CAN bus with 120 Wtermination
J52 General purpose LED Open LEDs Disabled Closed
Closed LEDs Enabled
J53 UART power supply Open UART Disabled Open
Closed UART Enabled
J54 MCU output mcu_PP0 func-
tion
Open LED D101 not used Closed
Closed LED D101 connected to PWM0 output
J87 Channel B SCK pin connec-
tion
Open SCK_B disconnected Closed 1-2
Closed 1-2 SCK_B connected to common hardware SPI interface
Closed 2-3 SCK_B connected to separated software SPI interface
J89 Channel B SDO pin connec-
tion
Open SDO_B disconnected Closed 1-2
Closed 1-2 SDO_B connected to common hardware SPI interface
Closed 2-3 SDO_B connected to separated software SPI interface
J75 Channel A Bus Driver digital
input pull-ups
Open TxEN, SCN and SCK pull-ups disconnected from VIO Closed
Closed TxEN, SCN and SCK pull-ups connected to VIO
J85 Channel B Bus Driver digital
input pull-ups
Open TxEN, SCN and SCK pull-ups disconnected from VIO Closed
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)
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Figure 16. FlexRay Bus Termination Connection (Channel A: R7x, C7x; Channel B: R8x, C8x)
FlexRay Bus
Driver
BP
BM BUS
R71
R81
R70
R80
C76
C86
C75
C85
R72
R82
C77
C87
Table 5. FLEXRAY BUS TERMINATION CONFIGURATION AND PARAMETERS
Component
End node
(Low-Ohmic termination)
Middle node – Variant 1
(High-Ohmic termination)
Middle node – Variant 2
(Custom termination)
Ch. A: C75, C76
Ch. B: C85, C86 Short Short 100 pF
Ch. A: R70, R71
Ch. B: R80, R81 47 W1300 W24 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.
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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:
Figure 18. Address Switch
01234567
⋅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!
⋅The switch configuration shown in this figure
means binary 0b00000010 (Node address is set
to 2).
MCU Reset Button
This button is connected directly to MCU RESET pin.
MCU External Interrupt Button
The MCU interrupt module support one maskable
interrupt input. This input is connected to SW11.
LEDs
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.
Figure 19. LEDs Description
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