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參數(shù)資料
| 型號： | SP304 |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 143K |
| 代理商： | SP304 |
Corporation
SIGNAL PROCESSING EXCELLENCE
86
SP304 CONFIGURATIONS IN LOOPBACK MODE
Two -Channel Full Duplex RS-232
One-Channel Full Duplex RS-232 &
One-Channel Full Duplex RS-422
LOOPBACK
The
SP304
has a function called loopback, which is
essentially a chip self-test. However, by connecting
system test loops with the inputs and outputs of the
SP304
, a system-level diagnostic can be run on
power-up or on command. The test loops can be
RIA
1
ROA
1
TOA
1
TIA
1
RIB
1
ROB
1
TOB
1
TIB
1
RS-232 LINE DRIVER
RS-232 RECEIVER
SELECT A = 0
SELECT B = 0
LB = 0
(ACTIVE)
RIA
2
ROA
2
TOA
2
TIA
2
RIB
2
ROB
2
TOB
2
TIB
2
RS-232 LINE DRIVER
RS-232 RECEIVER
RS-232 LINE DRIVER
RS-232 RECEIVER
RS-232 LINE DRIVER
RS-232 RECEIVER
RIA
1
ROA
1
TOA
1
TIA
1
RIB
1
ROB
1
TOB
1
TIB
1
RS-232 LINE DRIVER
RS-232 RECEIVER
SELECT A = 0
SELECT B = 1
LB = 0
(ACTIVE)
TOB
2
RIB
2
TOA
2
TIA
2
RIA
2
ROA
2
RS-422 LINE DRIVER
RS-422 RECEIVER
RS-232 LINE DRIVER
RS-232 RECEIVER
enabled and disabled allowing both system test and
operation with the same components. A maximum
data rate for loopback of 3kbps is recommended.
Loopback is a pin-programmable function, activated
by a logic low on the
LB
pin (19). As shown in these
figures, the loopback function internally con-
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