Datasheet

Ω
120
Ω
120
CANH
CANL
TMS320LF243
SN65HVD251
D R
Rs
Vref
CANTX CANRX
Sensor, Actuator, or Control
Equipment
TMS320F2812
SN65HVD233
D R
0.1µF
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
0.1µF
Vcc
GND
5 V
0.1
µ
F
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.
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