ISO6442DFPR datasheet(29/56 Pages) TI2

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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

The ISO644x devices are high-performance, low power, 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 parallel

(multiple) driver applications. The ISO644x devices use single-ended CMOS-logic switching technology.

The supply voltage range is from 2.25V to 5.5V for both supplies, VCC1 and VCC2. Since an isolation barrier

separates the two sides, each side can be sourced independently with any voltage within the Section 6.3 . As

an example, supplying ISO644x VCC1 with 3.3V (which is within 2.25V to 5.5V) and VCC2 with 5V (which is

also within 2.25V to 5.5V) is possible. 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, MCU or FPGA), 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

XOUT

XIN

MSPM0

C2000

AM2xxx

TM4Cxx

INA

OUTD

ISO6441

GND

VCC

EN1

EN2

INB

OUTB

OUTC

IND

INC

SDI

SCLK

SDO

VBD

AGND

CH0

SCLK

SDI

SDO

ADS7953

CH15

BDGND

REFP

MXO

AINP

REFM

GND

OUT

REF5025

MBR0520L

1:1.33

SN6501

Vcc

GND

3.3V

GND

OUT

TLV70733

3.3V

16 Analog

Inputs

ISO-BARRIER

ISO

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

www.ti.com

ISO6440, ISO6441, ISO6442

SLLSG01B – SEPTEMBER 2024 – REVISED NOVEMBER 2025

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