Sensor System

(MSP430)

+ BAT

SSC

C

+

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

2

BUSL2

BUSL1

VB

PF

VS

VDD

BAT

RX

RXI

TX

TXI

TSS521

RIS

SC GND RIDD

SC

C

STC

C

OC1

R1

TXI

RXI

OC2

VDD

C

load

R

RIS

R

RIDD

R

R2

R3

R4

RL1

220

RL2

220

Meter-Bus

STC

+

RL1

220

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

2

BUSL2

BUSL1

VB

PF

VS

VDD

BAT

RX

RXI

TX

TXI

TSS521

RL2

220

Sensor System

(MSP430)

Meter-Bus

SSC

C

SC

C

STC

C

RIS

R

RIDD

R

+

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

2

BUSL2

BUSL1

VB

PF

VS

VDD

BAT

RX

RXI

TX

TXI

TSS521

+ BAT

C

SC

C

STC

C

RIS

R

RIDD

R

+

3

4

5

6

7

8

9

10

11

12

13

14

15

16

1

2

BUSL2

BUSL1

VB

PF

VS

VDD

BAT

RX

RXI

TX

TXI

TSS521

RIS

+ BAT

C

SC

C

STC

C

RIS

R

RIDD

R

Remote Supply

Battery Supply

SSC

SSC

T1

load

R

VDD

C

RL1

220

RL2

220

RL1

220

RL2

220

SC

GND RIDD STC

RIS

GND RIDD STC

SC

RIS

GND RIDD STC

SC

Sensor System

(MSP430)

Sensor System

(MSP430)

Remote Supply With Battery Support

TSS521

SLAS980 – SEPTEMBER 2013

www.ti.com

NOTE: RDSon of the transistor T1 (BSS84) at low battery voltage must be considered during application design.

Figure 8. Basic Applications for Different Supply Modes

Figure 9. Basic Optocoupler Application

10

Submit Documentation Feedback

Copyright © 2013, Texas Instruments Incorporated