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 ISO1044B device can be used with other components from Texas Instruments such as a microcontroller, a

transformer driver, and a linear voltage regulator to form a fully isolated CAN interface.

9.2 Typical Application

TPS76350

1

2

4

3

7

6

5

IN

EN

GND

NC

OUT

1

3

5

4

2

TXD

VCC1

RXD

GND1

CANH

4

3

2

6

5

1

CANL

7

8

8

VCC2

MCU

RXD

TXD

VDD

DGND

Digital

Ground

ISO

Ground

SN6505

VCC

D2

D1

GND

CLK

Galvanic

Isolation Barrier

ISO1044

EN

3.3 V

GND2

3.3 V

Optional bus

protection

circuitry

100 nF

100 nF

CANH

CANL

CMC

Optional bus

protection

circuitry

Figure 9-1. Application Circuit With ISO1044 in 8-SOIC Package

ISO1044B is optimized for small solution size and meets 8 kV contact ESD (Electrostatic discharge) per IEC

61000-4-2 standalone with no external components on bus. If the application requires the usage of Common

mode choke (CMC) as shown in Figure 9-1, then use of Transient voltage suppressor (TVS) is a must to achieve

8kV IEC ESD. Test results with CMC Part number: ACT45B-101-2P-TL003 and TVS Part number: CPDT-12V

show 8 kV IEC ESD (Level 4) pass.

9.2.1 Design Requirements

Unlike an optocoupler-based solution, which requires several external components to improve performance,

provide bias, or limit current, the ISO1044B device only requires external bypass capacitors to operate.

www.ti.com

ISO1044

SLLSFB0A – MARCH 2020 – REVISED JULY 2020

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Product Folder Links: ISO1044