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SN65HVD257D Datasheet(PDF) 7 Page - Texas Instruments |
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SN65HVD257D Datasheet(HTML) 7 Page - Texas Instruments |
7 / 28 page 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 Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: SN65HVD255 SN65HVD256 SN65HVD257 |
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