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

Sensor System

(MSP430)

C

SSC

C

SC

R

RIS

R

RIDD

C

VDD

R

load

RL1

220

RL2

220

Meter-Bus

C

= system stabilizing capacitor

C

= support capacitor

C

= sampling capacitor

C

= stabilizing capacitor (100 nF)

C

:C

4:1

SSC

STC

SC

VDD

STC

VDD

≥

R

= slave=current adjustment resistor

R

= modulation-current resistor

RL1,RL2 = protection resistors

R

= discharge resistor (100 k

recommended)

RIDD

RIS

load

W

BAT

+

+

STC

C

+

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

Meter-Bus

C

ST

C

SC

C

STC

R

RIS

R

RIDD

T1

RIS

SC GND RIDD

STC

Remote Supply

R

= 30 k

RIDD

W

C

=< 220 µF

STC

R

= 13 k

RIDD

W

C

=< 470 µF

STC

single load 1UL

double load 2UL

Sensor System

(MSP430)

TSS521

www.ti.com

SLAS980 – SEPTEMBER 2013

APPLICATION INFORMATION

NOTE: Transistor T1 should be a BSS84.

Figure 6. Basic Application Circuit With Support Capacitor CSTC > 50 µF

Figure 7. Basic Application Circuit for Supply From Battery

Copyright © 2013, Texas Instruments Incorporated

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