Datasheet

+
RL1
220
34
5
6
7
8
9
10
11
12
13
14
15
16
1
2
BUSL1
BUSL2
VBPF
VS
VDD
BAT
RX
RXI
TX
TXI
TSS721A
RL2
220
SENSOR
SYSTEM
(e.g., MSP430)
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
34
5
6
7
8
9
10
11
12
13
14
15
16
1
2
BUSL1
BUSL2
VBPF
VS
VDD
BAT
RX
RXI
TX
TXI
TSS721A
SENSOR
SYSTEM
(e.g., MSP430)
C
SSC
C
SC
C
STC
R
RIS
R
RIDD
C
VDD
R
load
RL1
220
RL2
220
METER -BUS
C - system stabilising capacitor
C - support capacitor
C - sampling capacitor
C - stabilising 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
Battery
TSS721A
www.ti.com ................................................................................................................................................ SLAS222A –APRIL 1999–REVISED SEPTEMBER 2009
APPLICATION INFORMATION
NOTE: Transistor T1 should be a BSS84.
Figure 6. Basic Application Circuit Using Support Capacitor C
STC
> 50 μF
Figure 7. Basic Application Circuit for Supply From Battery
Copyright © 1999–2009, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): TSS721A