14

13

INA

OUTD

3

4

5

6

0.1 F

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

0.1 F

P3.1

P3.0

CLK

SOMI

13

11

12

14

4

2

MSP430

F2132

DVss

DVcc

0.1 F

14

13

OUTD

3

4

5

6

0.1 F

NC

EN

7

10

12

11

OUTC

IND

INC

1

VCC1

16

VCC2

2,8

9,15

GND1

GND2

0.1 F

ISO7640

ISO7641

5VISO

5VISO

3.3V

3.3V

P3.7

P3.6

18

17

3.3V

22

AVDD

AGND

21

5VISO

0.1 F

AIN2-

13

14

17

16

15

11

12

18

INA

INB

OUTB

OUTA

OUTA

OUTB

1

0.1 F

0.1 F

5VISO 5VISO

Thermo

couple

Current

shunt

RTD

Bridge

XOUT

XIN

5

6

P3.4

15

P3.5

16

ADS1234

ISO-BARRIER

ISO7640FM, ISO7641FM

SLLSE89G – SEPTEMBER 2011 – REVISED JANUARY 2015

www.ti.com

9 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.

9.1 Application Information

ISO764x use single-ended TTL-logic switching technology. Its supply voltage range is from 3 V to 5.5 V for both

supplies, VCC1 and VCC2. When designing with digital isolators, it is important to note that due to 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.

9.2 Typical Application

Figure 16. Isolated Data Acquisition System for Process Control

9.2.1 Design Requirements

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current,

the ISO764x device only requires two external bypass capacitors to operate.

26

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