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STR485 数据表(PDF) 5 Page - STMicroelectronics

部件名 STR485
功能描述  3.3 V RS485 compatible with 1.8 V I/Os and selectable speed 20 Mbps or 250 kbps
PDF  24 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

STR485 数据表(HTML) 5 Page - STMicroelectronics

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Figure 5. Example of typical application
B
B
B
B
A
A
A
A
GND
GND
GND
GND
VCC
VCC
VCC
VCC
D
D
D
D
DE
DE
DE
DE
R
R
R
R
RE
RE
RE
RE
VL
VL
VL
VL
SLR
SLR
SLR
SLR
RT
120Ω
RT
120Ω
Table 2. Driver truth table
INPUT D
ENABLE DE
OUTPUT A
OUTPUT B
Function
H
H
H
L
Actively drive bus high
L
H
L
H
Actively drive bus low
X
L
Z
Z
Driver disabled
X
Open
Z
Z
Driver disabled by default
Open
H
H
L
Actively drive bus high by default
Table 3. Receiver truth table
Differential input VID = VA -VB
ENABLE RE
OUTPUT R
Function
VID > VIT+
L
H
Receive valid bus high
VIT- < VID < VIT+
L
?
Indeterminate bus state
VID < VIT-
L
L
Receive valid bus low
X
H
Z
Receiver disabled
X
OPEN
Z
Receiver disabled by default
Open-circuit bus
L
H
Fail safe high output
Short-circuit bus
L
H
Fail safe high output
Idle (terminated) bus
L
H
Fail safe high output
Table 4. Speed selection, SLR pin configuration
SLR
Data rate
Typical tr / tf
VL
250 kbps
200 ns
GND or OPEN
20 Mbps
7 ns
STR485
Truth tables
DS12713 - Rev 1
page 5/24



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