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參數(shù)資料
| 型號(hào)： | A5016 |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Standby current for RS-422 repeater is less than3A |
| 中文描述： | 待機(jī)電流為RS - 422中繼器是減少than3A |
| 文件頁(yè)數(shù)： | 1/2頁(yè) |
| 文件大?。?/td> | 155K |
| 代理商： | A5016 |
16
The RS-422 interface is an excellent choice for commu-
nicating in noisy environments and over a distance.
However, when the distance exceeds the RS-422 capa-
bility for reliable data transfer, you must add a repeater.
The repeater circuit in
Figure 1
, which must operate
from batteries when no power supply is available,
draws less than 3
μ
A of current from a 3V supply.
Low standby power and true fail-safe operation are the
key features in this application. U1 and U2 drive their
receiver outputs (RO) high when the RS-422 inputs
are open circuited or terminated and undriven. An
incoming data byte on the differential inputs A1 and
B1 forces a transition on RO of U1, and a state
machine (right half of the Figure 1 schematic) is
latched ON by the falling edge of RO. The state
machine asserts a high level at U2’s driver-enable pin,
causing the incoming data byte to be retransmitted
from U2 at full RS-422 levels.
The state machine watches for transitions on RO.
When a data-byte transfer is complete (as indicated by
no falling edges within a time delay internal to the state
machine), the state machine resets itself in anticipation
of the next data byte from either side of the interface.
An incoming data burst (
Figure 2
, top) is retrans-
mitted as outputs A2 (bottom trace) and B2 (middle
trace). U2 de-asserts those outputs 700
μ
s after the
final transition. Other delays can be implemented by
adjusting R1/C1 and R2/C2 as shown in Figure 1.
Figure 1. This RS-422 repeater draws only 3μA of standby current.
DESIGN SHOWCASE
Standby current for RS-422 repeater is
less than 3
μ
A
MAX3471
MAX3471
B1
V
CC
V
CC
V
CC
D1
1N4148
D2
1N4148
R1
4.7M
R2
4.7M
C1
220pF
C2
220pF
C3
100nF
C4
100nF
V
CC
V
CC
V
CC
8
7
6
5
1
2
3
4
U1
B
A
GND
RO
RE
DE
DI
V
CC
8
7
6
5
1
2
3
4
U2
B
A
GND
RO
RE
DE
DI
R3
120
R4
120
A1
GND1
GND2
B2
A2
4
5
6
U3B
74HC00
U4A
74HC74
U4B
74HC74
1
2
1
3
2
6
CLK
D
Q
Q
5
P
4
13
3
9
10
8
U3A
74HC00
U3C
74HC00
12
13
11
U3D
74HC00
C
10
12
11
9
D
CLK
Q
Q
8
C
P
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