參數(shù)資料
型號(hào)： ISL41334EVAL1Z
廠商： Intersil
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 0K
描述： EVALUATION BOARD FOR ISL41334
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，收發(fā)器，RS-232，RS-422，RS-485
嵌入式： 否
已用 IC / 零件： ISL41334
主要屬性： 2 個(gè)驅(qū)動(dòng)器，2 個(gè)接收器 - RS-232 模式
次要屬性： 1 個(gè)驅(qū)動(dòng)器，1 個(gè)接收器 - RS-422/RS-485 模式
已供物品： 板
13
FN6202.3
November 21, 2007
Typical Application
RS-232 to RS-485 Converter
The ISL81334, ISL41334 are ideal for implementing a single
IC 2-wire (Tx Data, Rx Data) protocol converter, because
each port can be programmed for a different protocol.
Figure 8 illustrates the simple connections to create a single
transceiver RS-232 to RS-485 converter. Depending on the
RS-232 data rate, using an RS-422 bus as an RS-232
“extension cord” can extend the transmission distance up to
4000’ (1220m). A similar circuit on the other end of the cable
completes the conversion to/from RS-232.
Detailed Description
Each of the two ISL81334, ISL41334 ports supports dual
protocols: RS-485/422, and RS-232. RS-485 and RS-422 are
differential (balanced) data transmission standards for use in
high speed (up to 20Mbps) networks, or long haul and noisy
environments. The differential signaling, coupled with RS-485’s
requirement for extended common mode range (CMR) of +12V
to -7V make these transceivers extremely tolerant of ground
potential differences, as well as voltages induced in the cable
by external fields. Both of these effects are real concerns when
communicating over the RS-485, RS-422 maximum distance of
4000’ (1220m). It is important to note that the ISL81334,
ISL41334 don’t follow the RS-485 convention whereby the
inverting I/O is labeled “B/Z”, and the noninverting I/O is “A/Y”.
Thus, in the application diagrams below the 1334 A/Y (B/Z)
pins connect to the B/Z (A/Y) pins of the generic RS-485,
RS-422 ICs.
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
Test Circuits and Waveforms (Continued)
D
DY,Z
SIGNAL
GENERATOR
RL
Y, Z
CL
OUT (Y,Z)
3V
0V
1.5V
VO+
VO-
0V
DY,Z
SKEW = |tDPHL - tDPLH|
tDPHL
tDPLH
R
RXEN (QFN ONLY)
A, B
SIGNAL
GENERATOR
RA, RB
CL = 15pF
RA, RB
3V
0V
tRPHL
1.7V
1.3V
VOH
VOL
0.8V
2.4V
tRPLH
A, B
SKEW = |tRPHL - tRPLH|
26
VCC
Y1
Z1
DY1
DZ1
0.1F
+
0.1F
+
0.1F
22
23
6
7
1
2
3
15
V+
V-
C1+
C1-
C2+
C2-
+
0.1F
28
27
RA1
A1
4
5k
Ω
RB1
B1
525
5k
Ω
C1
C2
+C3
C4
GND
+5V
+ 0.1F
14
SEL1
ON/OFF
8
20
VCC
24
R
D
NOTE: PINOUT FOR SOIC AND SSOP
Y2
Z2
DY2 19
11
10
DE2 18
VCC
D
RA2
A2
13
B2
12
17
R
SEL2
9
VCC
RS-232 IN
RS-232 OUT
RS-485 IN
RS-485 OUT
NC
FIGURE 8. SINGLE IC RS-232 TO RS-485 CONVERTER
TxD
RxD
ISL81334, ISL41334
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