VCC1

VCC2

GND1

GND2

8

7

4

5

4

XOUT

XIN

5

6

2

MSP430

G2132

1

2

3

ISO1541

DVss

DVcc

0.1μF

0.1μF

0.1μF

6

SDA

SCL

9

8

10μF

0.1μF

MBR0520L

MBR0520L

1:2.2

0.1μF

3

1

D2

SN6501

D1

Vcc

4,5

2

GND

3.3V

IN

ON

GND

OUT

1

5

2

3

LP2981-50

10μF

10μF

SDA2

SDA1

SCL1

SCL2

1.5k

1.5k

1.5k

1.5k

0.1μF

8

VDD

GND

AIN0

2

1

9

10

SDA

SCL

4

ADDR

ADS1115

AIN3

RDY

3

4 Analog

Inputs

7

GND

2

6

4

REF5040

1μF

22μF

0.1μF

4

VDD

11

10

SDA

SCL

1

DAC8574

8

GND

6

12

3

A2

15

5

4 Analog

Outputs

A3

16

A0

13

9

14

LDAC

A1

ISO-BARRIER

1Ω

ISO1540

ISO1541

www.ti.com

SLLSEB6 – JULY 2012

Typical Application Circuit

data and conversion results for the analog inputs and outputs. Low-power data converters build the analog

interface to sensors and actuators. The ISO1541 provides the necessary isolation between different ground

potentials of the system controller, remote sensor, and actuator circuitry to prevent ground loop currents that

otherwise may falsify the acquired data.

The entire circuit operates from a single 3.3 V supply. A low-power push-pull converter, SN6501, drives a center-

tapped transformer whose output is rectified and linearly regulated to provide a stable 5 V supply for the data

converters.

Copyright © 2012, Texas Instruments Incorporated

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Product Folder Link(s): ISO1540 ISO1541