SN65HVD257D datasheet(7/28 Pages) TI

Part #	SN65HVD257D

Description	Turbo CAN Transceivers for Higher Data Rates and Large Networks Including Features

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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Normal CAN

communication

CAN

Bus

Signal

Bus Fault stuck dominant , example CANH

short to supply =5V and CAN L short to GND .

RXD output is returned recessive (high)

and FAULT is signaled to

P and link

layer / protocol.

RXD

(reciever)

RXD

(receiver)

tRXD_DTO

FAULT

Fault is repaired and normal

communication returns

FAULT cleared signal

is given

RXD mirrors

bus

RXD will also be “stuck dominant” blocking

alternative communication paths

Normal CAN

communication

CAN

Bus

Signal

TXD fault stuck dominant, example PCB

failure or bad software

Fault is repaired & transmission

capability restored

TXD

(driver)

%XVZRXOGEH³VWXFNGRPLQDQW´EORFNLQJFRPPXQLFDWLRQIRUWKH

whole network but TXD DTO prevents this and frees the bus for

communication after the time tTXD_DTO.

tTXD_DTO

Communication from

local node

Communication from

repaired node

RXD

(receiver)

Communication from

other bus node(s)

Communication from

repaired local node

FAULT

(HVD257)

Fault indication is removed.

FAULT is signaled to link layer / protocol.

Communication from

other bus node(s)

tTXD_DTO

Driver disabled freeing bus for other nodes

SN65HVD255

SN65HVD256, SN65HVD257

www.ti.com

SLLSEA2C – DECEMBER 2011 – REVISED SEPTEMBER 2013

Figure 6. Example Timing Diagram for TXD DTO and FAULT Pin

Figure 7. Example Timing Diagram for Devices With and Without RXD DTO and FAULT Pin

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Product Folder Links: SN65HVD255 SN65HVD256 SN65HVD257

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SN65HVD257D Datasheet(PDF) 7 Page - Texas Instruments

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