IL711/IL712/IL721

NVE Corporation

11409 Valley View Road, Eden Prairie, MN 55344-3617

Phone: (952) 829-9217

Fax: (952) 829-9189

www.IsoLoop.com

©NVE Corporation

Illustrative Applications

NVE offers a unique line of single-chip isolated RS-485, PROFIBUS, and CAN transceivers, but as illustrated in the circuits below, IL700-Series

Isolators can also be used as part of multi-chip designs with non-isolated transceivers:

IL710

IL711

ISL8485

5

6

7

8

4

3

2

1

1

2

3

4

8

7

6

5

1

5

6

7

2

8

3

4

Isolation

Boundary

Figure 1. Isolated PROFIBUS / RS-485 circuit.

IL712 / IL721

TxD

RxD

CANH

CANL

Rx0

7

6

2

1

4

3

1

2

3

4

8

7

6

5

2

DD2

AMIS-30660/

TJA1050

CAN

Controller

Figure 2. Isolated CAN circuit.

CAN isolation is increasingly necessary to reduce EMI susceptibility, especially in high- speed applications and in hybrid and electrical vehicle

networks, where the 12 V battery has been replaced with one of several hundred volts. Operator and equipment safety becomes critical when a

high voltage source, such as the battery, needs to be connected to diagnosis systems during routine maintenance procedures. In the application

shown above, the microcontroller is isolated from the CAN transceiver by an IL712 or IL721, allowing higher speed and more reliable bus

operation by eliminating ground loops and reducing susceptibility to noise and EMI events. The best-in-class 10 ns typical IL712/IL721

propagation delay minimizes CAN loop delay and maximizes data rate over any given bus length. This simple circuit works with any CAN

transceiver with a TxD dominant timeout, which includes all of the current-generation transceivers.

RS-485 Truth Table

D

DE

A

B

R

1

0

Z

Z

X

0

0

Z

Z

X

1

1

1

0

1

0

1

0

1

0