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 ISO642x devices are high-performance, low power, dual-channel digital isolators. The ISO642x 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 Recommended

Operating Conditions . As an example, supplying ISO642x 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 Universal Asynchronous Receiver/Transmitter (UART).

VCC1

VCC2

GND1

GND2

MSPM0

C2000

AM2xxx

TM4Cxx

INB

ISO6421

DVSS

DVCC

OUTA

INA

OUTB

UCA0TXD

UCA0RXD

DVDD

AVSS

AIN0

Tx

Rx

ADS122U04

AIN3

DGND

AVDD

ISO Barrier

AVSS

AVCC

AIN1

AIN2

Thermocouple

VCC1

VCC2

Figure 9-1. 2 Channel Typical Application

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