VCC1

VCC2

GND1

GND2

16

13

12

2, 8

9, 15

UCA0RXD

P3.0

UCA0TXD

16

11

15

4

XOUT

XIN

5

6

2

MSP430F2132

1

3

4

5

7

0.1 F

0.1 F

ISO7831

ISO Barrier

4.7 nF / 2 kV

SM712

10

MELF

0.1 F

DVSS

DVCC

10 F

0.1 F

MBR0520L

MBR0520L

1:2.2

0.1 F

3

1

D2

SN6501

D1

Vcc

4, 5

2

GND

IN

EN

GND

OUT

1

5

2

3

TPS76350

10 F

10 F

10

MELF

VIN

3.3 V

5VISO

INA

INB

OUTC

EN1

OUTA

OUTB

INC

SN65HVD3082E

RE

DE

D

R

EN2

14

10

1

4

3

2

B

A

VCC

GND

0.1 F

Copyright © 2016, Texas Instruments Incorporated

21

ISO7831, ISO7831F

www.ti.com

SLLSEP8B – JULY 2015 – REVISED JUNE 2016

Product Folder Links: ISO7831 ISO7831F

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Copyright © 2015–2016, Texas Instruments Incorporated

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 ISO7831x device is a high-performance, triple-channel digital isolator with 5.7-kVRMS isolation voltage. The

device comes with enable pins on each side which can be used to put the respective outputs in high impedance

for multi-master driving applications and reduce power consumption. The ISO7831x device uses single-ended

CMOS-logic switching technology. The supply voltage range is from 2.25 V to 5.5 V for both supplies, VCC1 and

VCC2. 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, μC or

UART), and a data converter or a line transceiver, regardless of the interface type or standard.

9.2 Typical Application

Figure 20 shows the isolated RS-485 interface application circuit.

Figure 20. Isolated RS-485 Circuit