变压器驱动器
隔离的RS- 485接口
MAX253
V
IN
5V
C1
0.1µF 5
6
北卡罗来纳州
V
CC
D1
1
隔离
屏障
ICT ： 1.3CT ** 1N5817
C3
0.1µF
8
3
1N5817
5× 3.3kΩ的
10× PC417
*74HC04
T1
IN
74HC04
T2
IN
74HC04
T3
IN
74HC04
T4
IN
74HC04
T5
IN
5× 3.3kΩ的
74HC04
R1
OUT
74HC04
R2
OUT
74HC04
R3
OUT
74HC04
R4
OUT
74HC04
R5
OUT
* 74HC04或同等
390Ω
14
390Ω
17
390Ω
23
6
5
4
1
2
390Ω
6
R2
OUT
R2
IN
5
390Ω
9
390Ω
22
390Ω
16
T4
IN
T4
OUT
1
390Ω
15
390Ω
390Ω
1
2
6
5
4
7
8
V
CC
T1
IN
GND
3
T1
OUT
SET GND SHDN
6
4
5
8
2
IN
OUT
C2
22µF
MAX667
ISO 5V
C4
22µF
开/关
4
SD
MAX253
D2
FS
GND1 GND2
2
7
T2
IN
T2
OUT
4
T3
IN
T3
OUT
2
T5
IN
T5
OUT
19
MAX205
R1
OUT
R1
IN
10
R3
OUT
R3
IN
24
R4
OUT
R4
IN
18
R5
OUT
SD
21
R5
IN
EN
20
13
**
见表2
4N25较低的速度，更低的成本ALTERNATE光电耦合器配置（下面为9.6kbps的数据速率）
V
CC
1N5711
4N25 6 1N5711
6 4N25
3.3kΩ
3.3kΩ
390Ω
1
1
T
IN
ISO ř
OUT
5
5
T
IN
390Ω
74HCO4
*74HC04
2
2 ISO
ISO
4
4 GND
GND
V
CC
ISO
R
OUT
图5.典型的RS - 232应用电路
8
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
