Texas Instruments SN65HVD257 Manual de usuario

User's Guide

SLLU172–August 2012

SN65HVD257 CAN EVM:

Functional Safety and Redundant CAN Network

This User Guide details the SN65HVD257 CAN EVM (Controller Area Network Evaluation Module)

transceiver operation. It comes with two SN65HVD257 CAN transceivers factory installed, set up in a

redundant (parallel) CAN bus configuration. The EVM may be reconfigured by a user for other CAN

topologies. This User’s Guide explains the EVM configurations for basic redundant CAN evaluation, and

includes various load and termination settings.

Contents

1 Introduction .................................................................................................................. 2

1.1 Overview ............................................................................................................ 2

1.2 Example Using the SN65HVD257 in a Redundant Physical Layer CAN Network Topology ............ 2

2 SN65HVD257 CAN EVM .................................................................................................. 4

3 SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks) ..................................... 7

3.1 Overview and Basic Operation Settings ........................................................................ 7

3.2 Using CAN Bus Load and Termination Configuration ......................................................... 9

3.3 Using CAN Bus Protection and Filtering Configuration ...................................................... 10

3.4 Using Customer Installable IO Options for Current Limiting, Pull up or down, Noise Filtering ......... 11

3.5 Using customer installable IO options for 3.3V IO ........................................................... 11

4 SN65HVD257 EVM Configuration for Two Independent Networks ................................................. 12

4.1 Transceiver 1 Header (JMP3) .................................................................................. 12

4.2 Transceiver 2 Header (JMP7) .................................................................................. 12

5 Bill of Material (BOM) ..................................................................................................... 14

List of Figures

1 SN65HVD257 Basic Block Diagram and Pin Out....................................................................... 2

2 Typical SN65HVD257 Node To Build A Redundant Physical Layer Topology ..................................... 3

3 Typical Redundant Physical Layer Topology Using SN65HVD257 .................................................. 3

4 SN65HVD257 CAN EVM Top............................................................................................. 4

5 CAN EVM Schematic....................................................................................................... 5

6 Loopback Node 1 (JMP5 to JMP12).................................................................................... 13

7 Loopback Node 2 (JMP10 to JMP13) .................................................................................. 13

List of Tables

1 SN65HVD257 CAN EVM Connections .................................................................................. 6

2 Main Supply and IO Header (JMP1) Connections ..................................................................... 7

3 CAN Bus Termination Configuration ..................................................................................... 9

4 CAN Bus Protection and Filtering Configuration ...................................................................... 10

5 EVM Digital IO Configuration ............................................................................................ 11

6 EVM Digital IO Configuration ............................................................................................ 11

SLLU172–August 2012 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network

CANH

CANL

FAULT

TXD

GND

RXD

FAULT

DTO

Introduction

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1 Introduction

1.1 Overview

Texas Instruments offers a broad portfolio of High Speed (HS) CAN transceivers compatible with the

ISO11898-2 and ISO11898-5 High Speed CAN standards. These include 5V VCC only, 3.3V VCC only, 5V

VCC with IO level shifting and galvanic isolated CAN transceivers. These CAN transceiver families include

product mixes with varying features such as low power standby modes with and without wake up, silent

modes, loop back and diagnostic modes.

The Texas Instruments SN65HVD257 CAN EVM helps designers evaluate the operation and performance

of the SN65HVD257 CAN transceiver. The SN65HVD257 includes many features for functional safety

network implementation such as redundant CAN networks. The SN65HVD257 CAN EVM also provides

PCB footprints for different bus terminations, bus filtering, and protection concepts. The EVM is provided

with two SN65HVD257 devices installed. A separate EVM is available for the other CAN transceivers,

SN65HVD255 CAN EVM, and another EVM uses the galvanic isolated CAN transceiver family (ISO1050).

The SN65HVD257 meets the ISO1189-2 High Speed CAN (Controller Area Network) Physical Layer

standard (transceiver). It is designed as a next-generation CAN for the SN65HVD251 and ISO1050, but

with added features for functional safety networks such as redundant networks. It has very fast loop times

with a wide range of bus loading, allowing for data rates up to 1 megabit per second (Mbps) in long and

highly loaded networks and higher data rates in small networks. The device includes many protection

features to provide device and CAN network robustness. The device has two modes: normal mode and

silent mode, selected on pin 8. The FAULT pin indicates TXD dominant time out, RXD dominant time out,

thermal shut down and under voltage faults.

Figure 1. SN65HVD257 Basic Block Diagram and Pin Out

1.2 Example Using the SN65HVD257 in a Redundant Physical Layer CAN Network

Topology

CAN is designed for standard linear bus topology using 120Ωtwisted pair cabling. The SN65HVD257

CAN device includes several features that allow use of the CAN physical layer in nonstandard topologies

with only one CAN link layer controller (μP) interface. The SN65HVD257 allows much greater flexibility in

the physical topology of the bus while reducing the digital controller and software costs. The combination

of RXD dominant time out and the FAULT output provides great flexibility, control and monitoring of these

applications.

A simple example of this flexibility is to use two SN65HVD257 devices combined logically in parallel via an

AND gate to build a redundant (parallel) physical layer (cabling and transceivers) CAN network. Adding a

logic XOR with a filter adds automatic detection for a fault where one of the 2 networks goes open

(recessive) in addition to the faults detected by the SN65HVD257.

To allow CAN’s bit-wise arbitration to work, the RXD outputs of the transceivers must be connected via

AND gate logic so that the link layer logic (μP) receives a dominant bit (low) from any of the branches; the

transceivers appear to the link layer and above as a single physical network. The RXD dominant time out

(DTO) feature prevents a bus stuck dominant fault in a single branch from taking down the entire network

by returning the RXD pin for the transceivers on the branch with the fault to the recessive state (high) after

2SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network SLLU172–August 2012

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Bus 1 Bus 2

µP

SN65HVD257

RXD2

TDX

FLT2

SN65HVD257

FLT1

FLT3

RXD1

RXD

1A 2A

µP

SN65HVD257

RXD2

TDX

FLT2

SN65HVD257

FLT1

FLT3

RXD1

RXD

1n 2n

µP

SN65HVD257

RXD2

TDX

FLT2

SN65HVD257

FLT1

FLT3

RXD1

RXD

1n 2n

µP

SN65HVD257

RXD2

TDX

FLT2

SN65HVD257

FLT1

FLT3

RXD1

RXD

1Z 2Z

µP

SN65HVD257

RXD2

TDX

FLT2

SN65HVD257

FLT1

FLT3

Bus 1 Bus 2

RXD1

RXD

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Introduction

the tRXD_DTO time. The remaining branch of the network continues to function. The FAULT pin of the

transceivers on the branch with the fault shows this via the FAULT output to their host processors, which

will diagnose the failure condition. The S-pin (silent mode pin) may be used to put a branch in silent mode

to check each branch for other faults, including to look for bus open (recessive) faults. For automatic

detection of a branch being open (recessive), an XOR gate may be used to combine the RXD outputs of

both branches. During dominant bits (low), were the branches do not match the XOR, the circuit outputs a

logic high. A small RC filter on the output eliminates false outputs due to small timing differences in the

branches and transceivers. This XOR and the FAULT outputs of the transceivers could be connected to

edge triggered interrupt pins on the host microprocessor to enter specialize software routines if there is an

issue on the redundant network.

Thus it is possible build up a robust and redundant CAN network topology in a very simple and low cost

manner. These concepts can be expanded into other more complicated and flexible CAN network

topologies to solve various other system-level challenges with a networked infrastructure.

Figure 2. Typical SN65HVD257 Node To Build A Redundant Physical Layer Topology

Figure 3. Typical Redundant Physical Layer Topology Using SN65HVD257

SLLU172–August 2012 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network

SN65HVD257 CAN EVM

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2 SN65HVD257 CAN EVM

The EVM consists of 2 CAN bus “nodes” and the necessary logic to build functional safety networks. It is

pre-configured for redundant CAN network applications with the 2 CAN bus “nodes”, including the AND

gate to combine the RXD output from both buses and the XOR gate and filter (50kHz) to detect a bus

open fault. The EVM has simple connections to all necessary pins of the CAN transceiver devices and the

necessary logic to create a redundant network. Jumpers are provided where necessary to provide

flexibility for device pin and CAN bus configuration. There are test points (loops) for all main points where

probing is necessary for evaluation such as GND, VCC, TXD, RXD, CANH, CANL, S, FAULT. The EVM

supports many options for CAN bus configuration. It is pre-configured with two 120Ωresistors that may be

connected on the bus via jumpers; a single resistor is used with the EVM as a terminated line end (CAN is

defined for 120Ωimpedance twisted pair cable) or both resistors in parallel for electrical measurements

representing the 60Ωload the transceiver “sees” in a properly terminated network (120Ωtermination

resistors at both ends of the cable). If the application requires “split” termination, TVS diodes for protection

or Common Mode (CM) Choke the EVM has footprints available for these components via customer

installation of the desired component(s).

Figure 4. SN65HVD257 CAN EVM Top

4SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network SLLU172–August 2012

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Place near DUT Pin

LOOPBACK

RXD1

FLT1

RXDprime

TXDA

TXD1

TXDprime

TXDA

RXD1

RXD2

TXDprime

RXD2

TXDB

TXDprime

RXD1

FLT1

TXDprime

RXDprime

FLT2

TXD1

RXD1

FLT1

TXD2

FLT2

RXD2

FLT2

TXD2

TXDprime

TXDB

FAULT3

RXD2

RXD1

FAULT3

VCC

RXD2

R28

DNI

C16

DNI

R44

10k

JMP2

HIGH

LOW

C23

DNI

C21

DNI

C19

DNI

R11 0

TP4

CANH

R39

VCC

GND

G08

3 5

R40

4.7k

R14

330

TP20

CANH

C14

.1uF

R33

120

4.7k

R24

DNI

R27

DNI

VCC

GND

G86

JMP1

FLT1

GND

TXD

GND

RXD

GND

VCC

FLT2

GND

FLT3

JMP10

GND

CANH2

CANL2

GND

R16

4.7k

C29

0.1uF

C25

DNI

C10

DNI

TP16

GND

R7 0

DNI

R29

DNI

R35 0

TP21

RXD

C24

DNI

R21

TP11

CANL

JMP7

TXD2

GND

RXD2

FLT2

C26

DNI

VCC

GND

G08

3 5

JMP8

HIGH

LOW

TP22

CANL

TP17

CANH

TP15

GND

TP8

RXD

TP1

GND

C17

DNI

SN65HVD257

TXD

GND

Vcc

RXD

4FLT 5

CANL 6

CANH 7

C13

1uF

R10

DNI

R17

SN65HVD257

TXD

GND

Vcc

RXD

4FLT 5

CANL 6

CANH 7

R19

330

DNI

TP7

CANH

JMP5

GND

CANH1

CANL1

GND

JMP6

330

R30

330

0.1uF

R38

330

TP6

R12

120

JMP11

R45

10k

R47

3.3k

GREEN

TP14

GND.

TP23

FAULT

R46

10k

R20

TP12

VCC

C28

1nF

TP9

CANL

4.7uF

TP10

FAULT

JMP3

TXD1

GND

RXD1

FLT1

C15

DNI

C20

DNI

TB1

2PIN_TERMINAL_BLOCK

R22

DNI

JMP4

R43

10k

DNI

R26

TP2

GND

C27

4.7uF

VCC

GND

G08

3 5

R15

120

TP19

JMP9

C12

10uF

DNI

TP24

CANL

JMP13

R18

DNI

R32

DNI

JMP12

R41

10k

C11

DNI

R31 0

TP13

GND

DNI

R13

DNI

TP18

TXD

C22

DNI

R36

120

R42

10k

DNI

TP5

TXD

TP3

GND

0.1uF

R23

DNI

R37

DNI

C18

0.1uF

R25

4.7k

R34

DNI

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SN65HVD257 CAN EVM

Figure 5. CAN EVM Schematic

SLLU172–August 2012 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network

SN65HVD257 CAN EVM

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Table 1. SN65HVD257 CAN EVM Connections

Connection Type Description

Connection for access to all critical digital IO, supply and GND for driving the the CAN

JMP1 12 pin header transceivers externally with test equipment or interfaced to a processor EVM

JMP2 3 pin jumper S Mode Pin Control for transceiver 1

Connection for access to all critical digital IO of the single transceiver 1 (bus) when EVM is used

JMP3 5 pin header for 2 separate buses

Connect 120ΩCAN termination to the bus. Used separately for a single termination if EVM is at

end of the CAN bus and termination isn’t in the cable. Used in combination with JMP6 to get to

JMP4 2 pin jumper second CAN termination to represent the combined 60Ωload for CAN transceiver parametric

measurement.

JMP5 4 pin header Connection for access to transceiver 1 CAN bus output: CANH1, CANL1, GND, GND

Connect 120ΩCAN termination to the bus. Used in combination with JMP4 to get to second

JMP6 2 pin jumper CAN termination to represent the combined 60Ωload for CAN transceiver parametric

measurement.

Connection for access to all critical digital IO of the single transceiver 2 (bus) when EVM is used

JMP7 5 pin header for 2 separate buses

JMP8 3 pin jumper S Mode Pin Control for transceiver 2

Connect 120ΩCAN termination to the bus. Used separately for a single termination if EVM is at

end of the CAN bus and termination is not in the cable. Used in combination with JMP6 to get to

JMP9 2 pin jumper second CAN termination to represent the combined 60Ωload for CAN transceiver parametric

measurement.

JMP10 4 pin header Connection for access to transceiver 2 CAN bus output: CANH2, CANL2, GND, GND.

Connect 120ΩCAN termination to the bus. Used in combination with JMP4 to get to second

JMP11 2 pin jumper CAN termination to represent the combined 60Ωload for CAN transceiver parametric

measurement.

JMP12 2 pin jumper Next to JMP5 to allow jumping CAN bus 1 to CAN bus 2

JMP13 2 pin jumper Next to JMP10 to allow jumping CAN bus 1 to CAN bus 2

2 pin terminal

TB1 VCC supply and GND connection for the EVM

block

TP1 Test Point GND test point

TP2 Test Point GND test point

TP3 Test Point GND test point

TP4 Test Point CANH (bus 1) test point

TP5 Test Point TXD, transceiver 1, test point

TP6 Test Point S, transceiver 1, test point

TP7 Test Point CANH (bus 1) via 330Ωserial resistor test point

TP8 Test Point RXD, transceiver 1, test point

TP9 Test Point CANL (bus 1) test point

TP10 Test Point FAULT (transceiver 1) test point

TP7 Test Point CANL (bus 1) via 330Ωserial resistor test point

TP12 Test Point Vcc test point

TP13 Test Point GND test point

TP14 Test Point GND test point

TP15 Test Point GND test point

TP16 Test Point GND test point

TP17 Test Point CANH (bus 2) test point

TP18 Test Point TXD, transceiver 2, test point

TP19 Test Point S, transceiver 2, test point

TP20 Test Point CANH (bus 2) via 330Ωserial resistor test point

TP21 Test Point RXD, transceiver 2, test point

TP22 Test Point CANL (bus 2) test point

TP23 Test Point FAULT (transceiver 2) test point

TP24 Test Point CANL (bus 2) via 330Ωserial resistor test point

6SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network SLLU172–August 2012

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SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks)

3 SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks)

This section describes the setup and operation of the EVM for parameter performance evaluation.

3.1 Overview and Basic Operation Settings

3.1.1 VCC Power Supply (TB1 or TP12 or JMP1)

The basic setup of the EVM requires a single power supply to evaluate transceiver and network design

performance. Supply VCC on TB1, JMP1 header or via the VCC and GND test point loops. The supplie

powerd must meet the required specification of VCC for the transceiver being tested. LED D3 indicates VCC.

3.1.2 Main Supply and IO Header (JMP1)

All key IO and supply GND functions are brought to this header. It may be used to interface test

equipment, or a short cable can be made to connect to an existing customer application board or MCU or

DSP EVM board.

Table 2. Main Supply and IO Header (JMP1) Connections

Pin Connection Description

1 S1 Pin 5 of Transceiver 1. Used for Mode control.

2 FLT1 Pin 8 of Transceiver 1. Indicates fault with transceiver 1.

3 GND GND

4 TXD Pin 1 of Transceiver 1 and 2 (signal TXDprime). TXD (Transmit Data)

5 GND GND

6 RXD Pin 4 of Transceiver 1 and 2 combined via AND gate U2 (signal RXDprime). RXD (Receive Data)

7 GND GND

8 VCC Pin 3 of Transceiver. VCC

9 S2 Pin 5 of Transceiver 2. Used for Mode control.

10 FLT2 Pin 8 of Transceiver 2. Indicates fault with transceiver 2.

11 GND GND

12 FLT3 FAULT3: Open fault indicator. RXD (Pin 4) outputs of transceiver 1 and 2 combined via XOR gate U6 with

filter (signal FAULT3). Indicates bus open faults.

3.1.3 TXD Input (JMP1)

The TXD input on JMP1 is connected via signal TXDprime to the TXD pin (pin 1) of both transceivers for

redundant (parallel) transmission on both buses. Individually this signal may be observed at the

transceiver pin via TP5 (transceiver 1) and TP18 (transceiver 2). The signal path TXDprime to the JMP1

header is pre-installed with a 0Ωseries resistor, R10 and R34.

3.1.4 TXD Output (JMP1)

The RXD (combined) output of the transceivers via the AND gate for redundant (parallel) buses is JMP1.

Individually the RXD signals may be seen at the transceiver pin via TP8 (transceiver 1) and TP21

(transceiver 2). The combined RXD (RXDprime) signal path to the JMP1 header is pre-installed with a 0Ω

series resistor, R20 from the output of the AND gate U2.

3.1.5 S Pin (Mode Selection, pin 8) (JMP1, JMP2, JMP8, TP6 and TP19)

Pin 8 of the transceiver is the mode control pin of the device. Pin 8 of the devices is routed to JMP1,

JMP2 and JMP8.

SLLU172–August 2012 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network

SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks)

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MODE SELECTION OPTIONS

JMP1 configuration:

Using header JMP1 (which assumes all the digital IO signals), VCC, GND are routed to an external

system. Ensure that the MODE (JMP2 and JMP8) jumper settings are not conflicting with signals to

JMP1.

JMP2, transceiver 1 configuration (3 way jumper):

If using separate IO inputs, use JMP2 to configure the S pin (pin 8) of transceiver 1 to a pull up to

VCC (Silent Mode), or pull down to GND (Normal Mode).

JMP8, transceiver 2 configuration (3 way jumper):

If using separate IO inputs, use JMP8 to configure the S pin (pin 8) of transceiver 2 to a pull up to

VCC (Silent Mode) or pull down to GND (Normal Mode).

TP6, transceiver 1 configuration:

This test point connects directly to the S pin (pin 8) of transceiver 1. Ensure that JMP1 and JMP2

are not configured to conflict if TP3 is used as the input connection.

TP19, transceiver 2 configuration:

This test point connects directly to the S pin (pin 8) of transceiver 2. Ensure that JMP1 and JMP8

are not configured to conflict if TP19 is used as the input connection.

3.1.6 FLT 1 (FAULT, pin 5, transceiver 1) (JMP1, TP10)

Pin 5 of transceiver 1 is the fault output of the transceiver. This output is routed to JMP1 and TP10. This

output indicates a RXD DTO, TXD DTO, Thermal Shut Down or undervoltage fault with transceiver 1.

3.1.7 FLT 2 (FAULT, pin 5, transceiver 2) (JMP1, TP23)

Pin 5 of transceiver 2 is the fault output of the transceiver. This output is routed to JMP1 and TP23. This

output indicates a RXD DTO, TXD DTO, Thermal Shut Down or undervoltage fault with transceiver 2.

3.1.8 FLT 3 (bus open fault) (JMP1)

FLT3 is the fault output of the filtered XOR combination of the two transceiver (bus) outputs. FLT3 will

transition any time the two buses do not match, and thus indicate that one of the buses is open. The

output filter of this logic is pre-installed with a cut off frequency of 50kHz to all for large deviations in timing

between 2 parallel buses. This filter could be tuned by the user to match the filtering requirements of the

target application with respect to bit timing and how much reaction time, or “missing” dominant bits the

application requires, the XOR filter output to then show a transition to the monitoring processor.

3.1.9 JMP3 configuration (not used for Redundant Networks):

Using header JMP3 requires EVM reconfiguration for other applications.

3.1.10 JMP7 configuration (not used for Redundant Networks):

Using header JMP7 requires EVM reconfiguration for other applications.

8SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network SLLU172–August 2012

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SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks)

3.2 Using CAN Bus Load and Termination Configuration

Each bus of the EVM is populated with two 120Ωpower resistors selectable via jumpers between CANH

and CANL. By using one of the resistors, the EVM may be used as a terminated end of a bus. For

electrical measurements to represent the total loading of the bus, use both 120Ωresistors in parallel to

give the standard 60Ωload for parametric measurement. The EVM also has footprints for customer

installation of split termination if the application requires it. The table below summarizes how to use these

termination options. If split termination is used, care must be taken to match the resistors. The common-

mode filter frequency may be calculated by: fc=1/(2πR C). Normally, the split capacitance is in the

range of 4.7nF to 100nF. Keep in mind that this is the common-mode filter frequency, not a differential

filter that will impact the differential CAN signal directly.

Table 3. CAN Bus Termination Configuration

Split Termination CM Stabilizing

120ΩResistors Footprints Capacitor

"Termination Configuration Bus 1" JMP4 JMP6 R5 R13 C3

Standard Termination (120Ω) shorted open NA NA NA

60Ωload - Electrical Parameterics shorted shorted NA NA NA

Split Termination (Common Mode open open 60Ω60Ωpopulated

Stabilization)

Split Termination CM Stabilizing

"Termination Configuration Bus 2" 120ΩResistors Footprints Capacitor

JMP9 JMP11 R29 R37 C23

Standard Termination (120Ω) shorted open NA NA NA

60Ωload - Electrical Parameterics shorted shorted NA NA NA

Split Termination (Common Mode open open 60Ω60Ωpopulated

Stabilization)

SLLU172–August 2012 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network

SN65HVD257 EVM Setup and Operation for Redundant (Parallel Networks)

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3.3 Using CAN Bus Protection and Filtering Configuration

The EVM also has component footprints for various protection schemes to enhance robustness for

extreme system-level EMC requirements. Table 4 summarizes these options. Typical examples of for

these components are: CM choke (TDK ACT45B series and EPCOS B82789 series from 11µH to 100µH),

bus filter capacitors are typically 100pF or less, TVS diodes from the MMBZ series 27V or lower, varistors

such as the TDK AVR series).

Table 4. CAN Bus Protection and Filtering Configuration

Protection and Filtering Footprint Use Case Population and Description

Bus 1 Reference

Direct CAN transceiver to bus R7 and R11 populated with 0Ω(default

connection population)

Series Resistors or R7 and R11 or L1 Series resistance protection CAN R7 and R11 populated with MELF resistor

Common Mode Choke (common footprint) transceiver to bus connection as necessary for harsh EMC environment

L1 populated with CM choke to filter noise

CM choke (bus filter) as necessary for harsh EMC environment

Filter noise as necessary for harsh EMC

Bus Filtering Caps C2 and C5 Bus filter environment. Filter caps may be used in

combination with L1 CM choke.

To add extra protection for system level

transients and ESD protection, use the

D1 and D2,

Transient Protection Transient & ESD Protection population option footprints D1 and D2 for

C2 and C7 or D7 TVS diodes, or C2 and C7 or D7 for

varistors.

Protection and Filtering Footprint Use Case Population and Description

Bus 2 Reference

Direct CAN transceiver to bus R31 and R35 populated with 0Ω(default

connection population)

Series Resistors or R31 and R35 or L2 Series resistance protection CAN R31 and R35 populated with MELF resistor

Common Mode Choke (common footprint) transceiver to bus connection as necessary for harsh EMC environment

L2 populated with CM choke to filter noise

CM choke (bus filter) as necessary for harsh EMC environment

Filter noise as necessary for harsh EMC

Bus Filtering Caps C22 and C25 Bus filter environment. Filter caps may be used in

combination with L2 CM choke.

To add extra protection for system level

transients and ESD protection, use the

D4 and D5,

Transient Protection Transient & ESD Protection population option footprints D4 and D5 for

C22 and C25 or D6 TVS diodes or C22 and C25 or D6 for

varistors.

10 SN65HVD257 CAN EVM: Functional Safety and Redundant CAN Network SLLU172–August 2012

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