GND1

GND2

OUTA

16

14

12

2, 8

9, 15

P3.1

P3.0

UCA0TXD

UCA0RXD

11

15

16

12

4

XOUT

XIN

5

6

2

MSP430

F2132

INA

OUTD

1

3

5

4

6

ISO7142

0.1 F

0.1 F

0.1 F

EN1

EN2

7

10

INB

13

11

OUTB

INC

IND

16

0.1 F

OUTC

GND

15

T1IN

9

11

12

10

C2-

3

R1OUT

T2IN

14

13

5

7

8

6

4

2

1

R2OUT

C1+

C1-

C2+

TRS232

4.7 k

4.7 k

R1IN

T1OUT

R2IN

T2OUT

1 F

1 F

1 F

1 F

TxD

RxD

RST

CST

ISOGND

10 F

0.1 F

MBR0520L

MBR0520L

1:2.1

0.1 F

3

1

D2

SN6501

D1

4, 5

2

GND

3.3 V

IN

ON

GND

OUT

1

5

4

3

LP2985-50

3.3 F

10 F

ISO-BARRIER

2

BP

10 nF

ISO7142CC

SLLSEF1B – SEPTEMBER 2013 – REVISED AUGUST 2015

www.ti.com

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

ISO7142CC uses single-ended TTL-logic switching technology. Its supply voltage range is from 2.7 V to 5.5 V for

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

Typical isolated RS-232 interface implementation is shown in Figure 14.

Figure 14. Typical Isolated RS-232 Application Circuit for ISO7142

9.2.1 Design Requirements

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current,

ISO7142CC only requires two external bypass capacitors to operate.

16

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