ISO150AP datasheet(8/21 Pages) TI1

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APPLICATION INFORMATION

Data In

+5V (1)

(1)

(2)

(1)

(2)

Channel 2

Data Out

Channel 1

Data Out

Channel 2

Data In

Channel 1

(Transmit)

(Receive)

Channel 2

Channel 1

Side A

Side B

D2A R/T2A

D2B

VSB R/T2B

D1B

R/T1B

VSA

D1A R/T1A

NOTES: (1) Power Supplies and

grounds on side A and side B are

isolated. (2) Recommended bypass:

0.1 m F in parallel with 1nF.

Data

(I/O)

DE/RE

+5V

”1”

(+5V)

BUS

+5V

SN65HVD05

Channel 2

Channel 1

Side A

Side B

R/T

D1B

R/T1B

R/T

ISO150

SBOS032D – SEPTEMBER 2000 – REVISED AUGUST 2008 .......................................................................................................................................... www.ti.com

shown. The transmission direction can be controlled

Figure 14 shows the ISO150 connected for basic

by logic signals applied to the R/T pins. Channel 1

operation; Channel 1 is configured to transmit data

and 2 can be independently controlled for the desired

from side B to A, whereas Channel 2 is set for

transmission direction. See Figure 15 and Figure 16

transmission from side A to B. The R/T pins for each

for application examples using the ISO150.

of the four transceivers are shown connected to the

required logic level for the transmission direction

Figure 14. Basic Operation Diagram

Figure 15. Isolated RS-485 Interface

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