Datasheet

V
3.3 V
VDD
REF1
7 V
ECHO
CS2
TC1
CS1
BR
TC3
TC2
TC4
BAT
CS3
VF
RIDD
STC
VS
VDD
I
STC_use
I
CI1
I
STC
I
VDD
R
VS
I
CS3
VB
PF
BUSL1
TX
GND
RIS
BUSL2
TXI
RX
RXI
SC
REF2
1.3 V
I
MS
I
BUS
I
CI2
TSS721A
SLAS222A –APRIL 1999–REVISED SEPTEMBER 2009................................................................................................................................................ www.ti.com
FUNCTIONAL DESCRIPTION
Functional Schematic
TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME NO.
BUSL2 1 Meter-Bus
VB 2 Differential bus voltage after rectifier
STC 3 Support capacitor
RIDD 4 Current adjustment input
PF 5 Power fail output
SC 6 Sampling capacitor
TXI 7 Data output inverted
TX 8 Data output
BAT 9 Logic level adjust
VS 10 Switch for bus or battery supply output
VDD 11 Voltage regulator output
RX 12 Data input
RXI 13 Data input inverted
RIS 14 Adjust input for modulation current
GND 15 Ground
BUSL1 16 Meter-Bus
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