14

13

INA

OUTD

3

4

5

6

EN1

EN2

7

10

INB

12

11

OUTC

IND

INC

DVDD

DGND

2

GAIN1

24

25

26

GAIN0

SPEED

PWDN

AIN3+

AIN3±

AIN4+

A0

A1

AIN1+

AIN1±

AIN2+

SCLK

DOUT

REF+

REF±

AIN4±

1

VCC1

16

VCC2

2,8

9,15

GND1

GND2

23

20

19

28

8

7

27

P3.1

P3.0

CLK

SOMI

13

11

12

14

4

2

MSP430

F2132

DVss

DVcc

14

13

OUTD

3

4

5

6

NC

EN

7

10

12

11

OUTC

IND

INC

1

VCC1

16

VCC2

2,8

9,15

GND1

GND2

ISO7340

ISO7341

5VISO

5VISO

3.3 V

3.3 V

P3.7

P3.6

18

17

3.3 V

22

AVDD

AGND

21

5VISO

AIN2±

13

14

17

16

15

11

12

18

INA

INB

OUTB

OUTA

OUTA

OUTB

1

5VISO

5VISO

Thermo

couple

Current

shunt

RTD

Bridge

XOUT

XIN

5

6

P3.4

15

P3.5

16

ADS1234

ISO-BARRIER

0.1 F

0.1 F

0.1 F

0.1 F

0.1 F

0.1 F

0.1 F

0.1 F

22

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

10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

The ISO734x family of devices use single-ended TTL-logic switching technology. The supply voltage range is

from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, keep in mind that

because of the single-ended design structure, digital isolators do not conform to any specific interface standard

and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed

between the data controller (that is, μC or UART), and a data converter or a line transceiver, regardless of the

interface type or standard.

10.2 Typical Application

10.2.1 Isolated Data Acquisition System for Process Control

The ISO734x family of devices combined with Texas Instruments' precision analog-to-digital converter and mixed

signal micro-controller can create an advanced isolated data acquisition system as shown in Figure 20.

Figure 20. Isolated Data-Acquisition System for Process Control