SP301CS Ver la hoja de datos (PDF) - Signal Processing Technologies

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SP301CS

RS-232/RS-422 Line Drivers/Receivers

Signal Processing Technologies 

LOOPBACK

Both the SP301 and SP302 have a function called

loopback, which is essentially a chip self-test. How-

ever, by connecting system test loops with the inputs

and outputs of the SP301/302, a system-level diag-

nostic can be run on power-up or on command. The

test loops can be 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 func-

tion, activated by a logic low on the LB pin (19). As

SP301 CONFIGURATIONS IN LOOPBACK MODE

Two -Channel Full Duplex RS-232

One-Channel Full Duplex RS-232 &

One-Channel Full Duplex RS-422

TIA

TOA1

TIB

RS-232 LINE DRIVERS

RS-232 RECEIVERS

ROA

TOB1

RIA1

ROB

RIB1

SELECT A = 0

SELECT B = 0

LB = 1

TIA

RS-232 LINE DRIVER

RS-232 RECEIVER

ROA

TOA1

10k

10k VEE

RIA1

10k

VEE 10k

TIB

RS-422 LINE DRIVER

RS-422 RECEIVER

ROB

TOB2

TOB1

10k

10k VEE

RIB1

RIB2

SELECT A = 0

SELECT B = 1

LB = 0 (ACTIVE)

Corporation

SIGNAL PROCESSING EXCELLENCE

63

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