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

The ISO674x devices are high-performance, quad-channel digital isolators. These devices come with enable

pins on each side which can be used to put the respective outputs in high impedance for multi master driving

applications. The ISO674x devices use single-ended CMOS-logic switching technology. The supply voltage

sides, each side can be sourced independently with any voltage within recommended operating conditions. As

(which is also within 1.71 V to 5.5 V). You can use the digital isolator as a logic-level translator in addition to

providing isolation. 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.

9.2 Typical Application

Figure 9-1 shows the isolated serial peripheral interface (SPI).

Vcc1

Vcc2

GND1

GND2

OUTA

16

14

13

2,8

9,15

4

XOUT

XIN

5

6

2

MSP430

G2132

(14-PW)

INA

OUTD

1

3

4

5

6

ISO6741

DVss

DVcc

0.1 F

0.1 F

0.1 F

EN1

EN2

7

10

INB

12

11

OUTB

OUTC

IND

0.1 F

INC

SDI

P1.4

SCLK

SDO

9

6

7

8

4.7 k

4.7 k

28

VBD

AGND

CH0

1,22

CS

26

23

24

25

SCLK

SDI

20

SDO

ADS7953

CH15

5

BDGND

27

32

VA

31

REFP

2

MXO

3

AINP

REFM

30

GND

2

6

4

REF5025

1 F

10 F

0.1 F

MBR0520L

MBR0520L

1:1.33

0.1 F

3

1

D2

SN6501

D1

Vcc

4,5

2

GND

3.3 V

IN

EN

GND

OUT

4

1

2

3

TLV70733

10 F

10 F

22 F

16

Analog

Inputs

ISO-BARRIER

Figure 9-1. Isolated SPI for an Analog Input Module With 16 Inputs

ISO6741

SLLSFJ6 – AUGUST 2020

www.ti.com

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