ISO1050 datasheet(24/42 Pages) TI2

24 / 42 page

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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

ISO1050 can be used with other components from TI such as a microcontroller, a transformer driver, and a linear

voltage regulator to form a fully isolated CAN interface.

9.2 Typical Application

9,10

GND

OUT

ISO1050

TPS76350

RXD

VCC1

TXD

GND1

CANH

GND2

CANL

VCC2

RXD

TXD

MCU

Vdd

DGND

PSU

3.3V

Protective

Earth

Chasis

Ground

Digital

Ground

ISO

Ground

Optional Bus

protection

function

SN6501

VCC

GND2

GND1

Galvanic

Isolation

Barrier

Figure 9-1. Application Circuit

9.2.1 Design Requirements

Unlike optocoupler-based solution, which needs several external components to improve performance, provide

bias, or limit current, ISO1050 only needs two external bypass capacitors to operate.

9.2.2 Detailed Design Procedure

9.2.2.1 Bus Loading, Length and Number of Nodes

The ISO11898 Standard specifies a maximum bus length of 40 m and maximum stub length of 0.3 m with a

maximum of 30 nodes. However, with careful design, users can have longer cables, longer stub lengths, and

many more nodes to a bus. A high number of nodes requires a transceiver with high input impedance such as

the ISO1050.

ISO1050

SLLS983L – JUNE 2009 – REVISED OCTOBER 2023

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