TCAN1042-Q1_17 Datasheet, PDF (25/40 Pages) Texas Instruments – Automotive Fault Protected CAN Transceiver with CAN FD

www.ti.com
TCAN1042-Q1, TCAN1042V-Q1, TCAN1042H-Q1
TCAN1042HV-Q1, TCAN1042G-Q1, TCAN1042GV-Q1
TCAN1042HG-Q1, TCAN1042HGV-Q1
SLLSES9B – FEBRUARY 2016 – REVISED MAY 2017
Typical Applications (continued)
This flexibility in CAN network design is one of the key strengths of the various extensions and additional
standards that have been built on the original ISO 11898-2 CAN standard. In using this flexibility comes the
responsibility of good network design and balancing these tradeoffs.
10.2.2 Detailed Design Procedures
10.2.2.1 CAN Termination
The ISO 11898 standard specifies the interconnect to be a twisted pair cable (shielded or unshielded) with 120-Ω
characteristic impedance (Z_O). Resistors equal to the characteristic impedance of the line should be used to
terminate both ends of the cable to prevent signal reflections. Unterminated drop lines (stubs) connecting nodes
to the bus should be kept as short as possible to minimize signal reflections. The termination may be on the
cable or in a node, but if nodes may be removed from the bus, the termination must be carefully placed so that
two terminations always exist on the network.
Termination may be a single 120-Ω resistor at the end of the bus, either on the cable or in a terminating node. If
filtering and stabilization of the common mode voltage of the bus is desired, then split termination may be used.
(See Figure 17). Split termination improves the electromagnetic emissions behavior of the network by eliminating
fluctuations in the bus common-mode voltages at the start and end of message transmissions.
Standard Termination
Split Termination
CANH
CAN
Transceiver
R_TERM
CANL
CANH
CAN
Transceiver
CANL
R_TERM/2
R_TERM/2
C_SPLIT
Copyright © 2016, Texas Instruments Incorporated
Figure 17. CAN Bus Termination Concepts
The family of transceivers have variants for both 5-V only applications and applications where level shifting is
needed for a 3.3-V micrcontroller.
Copyright © 2016–2017, Texas Instruments Incorporated
Submit Documentation Feedback
25
Product Folder Links: TCAN1042-Q1 TCAN1042V-Q1 TCAN1042H-Q1 TCAN1042HV-Q1 TCAN1042G-Q1
TCAN1042GV-Q1 TCAN1042HG-Q1 TCAN1042HGV-Q1