Figure 8-17. Isolated I2C Interface for an Analog Data Acquisition System With 4 Inputs and 4 Outputs

VCC1

VCC2

GND1

GND2

INA

8

7

6

4

5

4

XOUT

XIN

5

6

2

MSP430

G2132

OUTA

1

2

3

ISO7421

DVSS

DVCC

INB

OUTB

P3.0

P3.1

11

12

10 F

VS

0.1 F

MBR0520L

MBR0520L

1:1.33

0.1 F

3

1

D2

SN6501

D1

VCC

4, 5

2

GND

3.3 V

IN

EN

GND

OUT

1

5

2

3

TPS76333

10 F

3.3VISO

10 F

ISO-BARRIER

0.1 F

0.1 F

0.1 F

0.1 F

3

VD

COMA

BASE

LOW

10

8

ERRLVL

DBACK

16

DIN

DAC161P997

OUT

9

C1

14

15

VA

COMD

2

C2

13

C3

12

3 × 22 nF

5

4

20

0.1 F

22

0.1 F

1 F

LOOP±

LOOP+

1

Figure 8-18. Isolated 4-20 mA Current Loop

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SN6501

SLLSEA0I – FEBRUARY 2012 – REVISED JANUARY 2021

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