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SN65HVD233DR 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
CAN芯片
封装:
SOIC-8
描述:
TEXAS INSTRUMENTS SN65HVD233DR 总线, CAN, CAN, 串行, 1, 1, 3 V, 3.6 V, SOIC 新
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封装信息在P4P29P30P31P32P33
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SN65HVD233DR数据手册
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CAN
Transceiver
CANL
CANH
C
SPLIT
CAN
Transceiver
R
TERM
Standard Termination
Split Termination
CANL
CANH
R /2
TERM
R /2
TERM
MCU or DSP
CAN
Controller
CAN
Transceiver
Node 1
MCU or DSP
CAN
Controller
CAN
Transceiver
Node 2
MCU or DSP
CAN
Controller
CAN
Transceiver
Node 3
MCU or DSP
CAN
Controller
CAN
Transceiver
Node n
(with termination)
R
TERM
R
TERM
SN65HVD233
,
SN65HVD234
,
SN65HVD235
www.ti.com
SLLS557G –NOVEMBER 2002–REVISED JANUARY 2015
Typical Application (continued)
11.2.2 Detailed Design Procedure
Figure 37. Typical CAN Bus
Termination is typically a 120-Ω resistor at each end of the bus. If filtering and stabilization of the common mode
voltage of the bus is desired, then split termination may be used (see Figure 38). Split termination uses two 60-Ω
resistors with a capacitor in the middle of these resistors to ground. 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.
Care should be taken in the power ratings of the termination resistors used. Typically the worst case condition
would be if the system power supply was shorted across the termination resistance to ground. In most cases the
current flow through the resistor in this condition would be much higher than the transceiver's current limit.
Figure 38. CAN Bus Termination Concepts
11.2.3 Application Curve
Figure 39 shows 3 typical output waveforms for the SN65HVD233 device with three different connections made
to the R
S
pin. The top waveform show the typical differential signal when transitioning from a recessive level to a
dominant level on the CAN bus with R
S
tied to GND through a 0-Ω resistor. The second waveform shows the
same signal for the condition with a 10-kΩ resistor tied from R
S
to ground. The bottom waveform shows the
typical differential signal for the case where a 100-kΩ resistor is tied from the R
S
pin to ground.
Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 25
Product Folder Links: SN65HVD233 SN65HVD234 SN65HVD235
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