Ω

120

Ω

120

CANH

CANL

TMS320LF243

SN65HVD251

D

R

Rs

Vref

CANTX

CANRX

Sensor, Actuator, or Control

Equipment

TMS320F2812

SN65HVD233

D

R

0.1

Vcc

GND

Rs

LBK

CANTX

CANRX

Sensor, Actuator, or Control

Equipment

TMS320LF2407A

SN65HVD230

D

R

Rs

Vref

CANTX

CANRX

Sensor, Actuator, or Control

Equipment

3.3 V

0.1

Vcc

GND

5 V

0.1

Vcc

GND

3.3 V

Stub Lines -- 0.3 m max

Bus Lines -- 40 m max

GPIO

SN65HVD233-HT

www.ti.com

SLLS933F – NOVEMBER 2008 – REVISED AUGUST 2012

APPLICATION INFORMATION

Diagnostic Loopback

The loopback (LBK) function of the SN65HVD233 is enabled with a high-level input to pin 5. This forces the

driver into a recessive state and redirects the data (D) input at pin 1 to the received-data (R) output at pin 4. This

allows the host controller to input and read back a bit sequence to perform diagnostic routines without disturbing

the CAN bus. A typical CAN bus application is displayed in Figure 26.

If the LBK pin is not used, it may be tied to ground (GND). However, it is pulled low internally (defaults to a low-

level input) and may be left open if not in use.

Figure 26. Typical SN65HVD233 Application

ISO 11898 Compliance of SN65HVD230 Family of 3.3-V CAN Transceivers

Introduction

Many users value the low power consumption of operating CAN transceivers from a 3.3-V supply. However,

some are concerned about the interoperability with 5-V supplied transceivers on the same bus. This section

analyzes this situation to address those concerns.

Differential Signal

CAN is a differential bus where complementary signals are sent over two wires, and the voltage difference

between the two wires defines the logical state of the bus. The differential CAN receiver monitors this voltage

difference and outputs the bus state with a single-ended output signal.

Copyright © 2008–2012, Texas Instruments Incorporated

Submit Documentation Feedback

21

Product Folder Links: SN65HVD233-HT