Texas Instruments 4Q 2006 manual Can 3.3-V and 5-V High-Speed can Transceivers, Selection Guide

18CAN (3.3-V and 5-V High-Speed CAN Transceivers)

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Design Considerations

Bus Protection — Features such as short-circuit protection, thermal shutdown protection, glitch-free power-up and power- down protection, high-ESD protection, wide common-mode range that provides for common-mode noise rejection, and current- limiting circuitry to protect the transceivers and system from damage during a fault condition have been incorporated into these devices.

CAN Transceiver Selection Guide

Electromagnetic Compatibility — An important requirement for products intended for networking applications is that they behave in a way that does not interfere with the operation of other nearby components or systems. TI offers specially designed and tested transceivers for EM compatibility without malfunction or degradation of performance in rugged EM environments. Compatibility in this definition means both immunity to external EM fields, and the limited strength of generated EM fields.

Supply Voltage — In addition to 5-V transceivers, TI offers 3.3-V transceivers that accomplish the same tasks with less than half the power and save on the cost of an additional voltage regulator in 3.3-V powered applications.

Technical Information

•ISO11898 specifies the physical-layer implementation of CAN.

•This specification describes a twisted wire pair bus with 120-W characteristic impedance (Zo) and differential signaling rate of up to 1 Mbps on a 40-meter bus with multi-drop topology.

Supply			ICC	ESD	Bus Fault	Operating	Price*
Voltage	Device	Description	Max (mA)	(kV)	Protection (V)	Temp Range
5.0	SN65HVD251	Improved Drop-In Replacement for the PCA82C250 and PCA82C251	65	±14	±36	–40 to 125° C	0.90
5.0
	SN65HVD1050	Improved Drop-In Replacement for the TJA1050 with Better ESD	70	±8	–27 to 40	–40 to 125° C	0.55
3.3	SN65HVD230	3.3-V CAN Bus Transceiver, Standby Mode	67	±16	–4 to 16	–40 to 85° C	1.35
	SN65HVD231	3.3-V CAN Bus Transceiver, Sleep Mode	67	±16	–4 to 16	–40 to 85° C	1.35
3.3	SN65HVD232	3.3-V CAN Bus Transceiver, Cost Effective	67	±16	–4 to 16	–40 to 85° C	1.30
	SN65HVD233	3.3-V CAN Bus Transceiver, Standby Mode, Diagnostic Loop-back	56	±16	±36	–40 to 125° C	1.50
	SN65HVD234	3.3-V CAN Bus Transceiver, Standby Mode, Sleep Mode	56	±16	±36	–40 to 125° C	1.45
	SN65HVD235	3.3-V CAN Bus Transceiver, Standby Mode, Autobaud Loop-back	56	±16	±36	–40 to 125° C	1.50

All devices have a signaling rate of 1 Mbps.

*Suggested resale price in U.S. dollars in quantities of 1,000.

New products are listed in bold red.

Selection Guide

Device

DSPs with CAN Controllers (3.3-V Supply Voltage)
TMS320LF2403A	TMS320F2802-60	TMS320LC2403A	TMS320F2806	TMS320LF2406A	TMS320F2808	TMS320LC2406A	TMS320F2809
TMS320LF2407A	TMS320F2810	TMS320LF2407A	TMS320C2810	TMS320F2801	TMS320F2811	TMS320F2801-100	TMS320R2811
TMS320F2801-60	TMS320C2811	TMS320F28016	TMS320F2812	TMS320C2802	TMS320C2812	TMS320F2802-100	TMS320R2812

ARM7 Microprocessors with CAN Controllers (3.3-V Supply Voltage)

TMS470R1A64

TMS470R1A384

TMS470R1A128

TMS470R1B512

TMS470R1A256

TMS470R1B768

TMS470R1A288

TMS470R1B1M

Standard Compliant Protocols

CAN is a serial communications bus for robust real-time control applications that is rapidly gaining the attention of industrial process, test, measurement and control engineers worldwide. It has excellent error detection and confinement capabilities, and has the flexibility to operate either as a primary backbone data communications network, as a secondary local embedded system, or as both. The engineering community is just now exploring the limits of what this bus can do when coupled with newly developed intelligent sensing technologies.

Besides CAN’s high reliability, another of the main advantages of CAN when compared to alternative networks, is the availability of higher layer protocols (HLPs). There are many CAN-related system development packages prepared for these HLPs – hardware interface cards and easy-to-use software packages that provide system designers with a wide range of design and diagnostic tools. These compo- nents provide for the rapid development of complex control applications without building each node of a system network from scratch.

The HLP relieves a developer from the burden of dealing with CAN-specific details such as

bit-timing and implementation functions. It provides standardized communication objects for real-time data with Process Data Objects (PDOs) and Service Data Objects (SDOs), and provides special functions such as a time stamp, a sync message, and emergency shut-down procedures as well as network management, boot-up commands, and error management.

Among the most popular HLPs are CANopen, CANkingdom and DeviceNet with applications ranging from medical equipment to process control and assembly line coordination.

Interface Selection Guide Texas Instruments 4Q 2006