TI-TSS521.pdf
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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
TSS521
www.ti.com
SLAS980 –SEPTEMBER 2013
Meter-Bus Transceiver
1
FEATURES
APPLICATIONS
• Meter-Bus Transceiver (for Slave) Meets • E-metering
Standard EN1434-3
• Advanced Metering Infrastructure (AMI)
• Receiver Logic With Dynamic Level
• Water Meters
Recognition
• Gas Meters
• Constant-Current Sink Adjustable By Resistor
• Heat Meters
• Polarity Independent
• Power-Fail Function DESCRIPTION
The TSS521 device is a single-chip transceiver
• Module Supply Voltage Switch
developed for Meter-Bus standard (EN1434-3)
• 3.3-V Constant Voltage Source
applications.
• Up to 9600 Baud in Half Duplex for UART
The TSS521 interface circuit adjusts the different
Protocol
potentials between a slave system and the Meter-Bus
• Slave Power Support
master. The connection to the bus is polarity
– Supply From Meter-Bus by Output VDD
independent and supports full galvanic slave isolation
with optocouplers.
– Supply From Meter-Bus by Output VDD or
From Backup Battery
The circuit is supplied by the master through the bus.
Therefore, this circuit offers no additional load for the
– Supply From Battery – Meter-Bus Active for
slave battery. A power-fail function is integrated.
Data Transmission Only
The receiver has dynamic level recognition, and the
transmitter has a programmable current sink.
A 3.3-V voltage regulator with power reserve for a
delayed switch off at bus fault is integrated.
Functional Schematic
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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