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參數(shù)資料
| 型號(hào)： | ISO422P-U |
| 元件分類： | 收發(fā)器 |
| 英文描述： | Transceiver |
| 中文描述： | 收發(fā)器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 246K |
| 代理商： | ISO422P-U |
ISO422
SBOS113A
6
CONNECTION TO CAN BUS
Since the bus can be enabled and disabled at the same rate
as the data (2.5MHz), it is possible to use ISO422 as an
isolated bus driver in CAN systems. Again, the ISO422 bus
line must be constrained within the supply voltages.
Figure 4 shows the connections which allow ISO422 to be
used in CANbus systems. The DE input of the ISO422 is
used as the CAN TX0 input and is used to transmit the data
by enabling and disabling the Y and Z outputs. The D and
RE inputs of the ISO422 are tied to GND
A
. This ensures that
the Y output can only pull down, and the Z output can only
pull up. With D tied to GND
A
, the DE input of ISO422 (TX0
of CAN) activates the Y output as an open drain pull-down
driver, and activates the Z output as an open drain pull-up
driver. Therefore, the Y line acts as CANL and the Z line acts
as CANH. When DE (TX0) is HIGH, ISO422 makes the bus
state dominant i.e., Y pulls LOW and Z pulls HIGH. With
DE (TX0) LOW, Y and Z are high impedance and the bus
state is recessive. Data is received in the normal manner
which is half duplex. Line A is connected to CANH, and line
B is connected to CANL. The R output becomes RX0. RE
is tied to GND
A
to keep R (RX0) enabled. If required, RE
may be used to disable the RX0 output.
FIGURE 3. Loopback.
FIGURE 4. CANBus Connection.
TX0
CANH
CANL
BUS
RX0
H
L
H
L
Dominant
Recessive
L
H
Hi-Z
Hi-Z
TABLE I. CAN.
24
23
22
21
16
15
14
13
1
2
3
4
9
10
11
12
DE
D
NC
V
CC
GND
B
GND
B
Y
Z
RE
R
LBE
GND
A
V
CC
V
CC
A
B
Loopback Enabled
Transmit and Receive Active
24
23
22
21
16
15
14
13
1
2
3
4
9
10
11
12
DE
D
NC
V
CC
GND
B
GND
B
Y
Z
RE
R
LBE
GND
A
V
CC
V
CC
A
B
Loopback Disabled
Transmit and Receive Active
TX0
RX0
R
D
RE
DE
Y
CANH
CANL
Z
A
B
ISO422
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