VCC1

VCC2

GND1

GND2

OUTA

16

14

12

2, 8

9, 15

P3.1

P3.0

UCA0TXD

UCA0RXD

11

15

16

12

4

XOUT

XIN

5

6

2

MSP430

F2132

INA

OUTD

1

3

5

4

6

ISO7342

DVSS

DVCC

0.1 F

0.1 F

0.1 F

EN1

EN2

7

10

INB

13

11

OUTB

INC

IND

16

0.1 F

OUTC

VCC

GND

15

T1IN

9

11

12

10

C2-

3

R1OUT

T2IN

14

13

5

7

8

VS-

6

4

2

1

R2OUT

VS+

C1+

C1-

C2+

TRS232

4.7 k

4.7 k

R1IN

T1OUT

R2IN

T2OUT

1 F

1 F

1 F

1 F

TxD

RxD

RST

CST

ISOGND

10 F

0.1 F

MBR0520L

MBR0520L

1:2.1

0.1 F

3

1

D2

SN6501

D1

VCC

4, 5

2

GND

3.3 V

IN

ON

GND

OUT

1

5

4

3

LP2985-50

3.3 F

10 F

ISO-BARRIER

VIN

5VISO

2

BP

10 nF

26

ISO7340C, ISO7340FC, ISO7341C, ISO7341FC, ISO7342C, ISO7342FC

SLLSEI6G – SEPTEMBER 2014 – REVISED JANUARY 2017

www.ti.com

Product Folder Links: ISO7340C ISO7340FC ISO7341C ISO7341FC ISO7342C ISO7342FC

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Copyright © 2014–2017, Texas Instruments Incorporated

Typical Application (continued)

10.2.3 Typical Application for RS-232 Interface

Typical isolated RS-232 interface implementation is shown in Figure 27.

Figure 27. Isolated RS-232 Interface

10.2.3.1 Design Requirements

Refer to Isolated Data Acquisition System for Process Control for the design requirements.

10.2.3.2 Detailed Design Procedure

Refer to Isolated Data Acquisition System for Process Control for the detailed design procedures.

10.2.3.3 Application Curves

Refer to Isolated Data Acquisition System for Process Control for the application curves.

11 Power Supply Recommendations

To help ensure reliable operation at data rates and supply voltages, a 0.1-μF bypass capacitor is recommended

at input and output supply pins (VCC1 and VCC2). The capacitors should be placed as close to the supply pins as

possible. If only a single primary-side power supply is available in an application, isolated power can be

generated for the secondary-side with the help of a transformer driver such as Texas Instruments' SN6501. For

such applications, detailed power supply design and transformer selection recommendations are available in

SN6501 Transformer Driver for Isolated Power Supplies.