Illustrative Applications

NVE Corporation

(952) 829-9217

iso-apps@nve.com

www.IsoLoop.com

www.nve.com

Visit www.IsoLoop.com for more illustrative IsoLoop Isolator applications.

Simple RS-485 Receiver

An IL610 can be used as a simple

isolated RS-485/RS-422 receiver.

Cabling is simplified by

eliminating the need to power the

receiving board input side. No

current-limiting resistor or

capacitor is needed for a single

receiver because it draws less than

the driver maximum current.

Termination resistors are usually

unnecessary because the 85

Ω

typical coil resistance is similar to

cable impedances.

GND

2

V

DD2

Z

ISL8490

D

C

1

V

DD1

GND

1

C

boost

3

2

5

6

7

8

3

4

6

C

2

1

-

+

IL610

R

RE

Notes:

C

boost is application specific

All other capacitors are 47 nF ceramic

Y

1

5

R

Isolated I²C Using IL612A

This circuit provides

bidirectional isolation of

I²C bus signals with no

restrictions on data rate and

none of the I²C bus latch-

up problems common with

other isolation circuits.

The SDA section is shown

here; the SCL section is

similar, and uses the other

half of the P82B96.

8

7

5

6

2

1

3

4

5V

5V

GND

1

GND

2

2K2

10K

750R

750R

C

3

C

2

C

1

3

2

8

1

4

½ P82B96

SDA

270 pF

16 pF

SDA_iso

Notes:

C1, C2, and C3 are 47nF ceramic

Resistor values change for 3 V operation

750R

V

DD2

V

DD1

IL612A