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Meter-Bus Transceiver

Features
· Meter-Bus Transceiver (for Slave) Meets Standard EN-1434-3
· Adjustable Constant-Current Sink via Resister
· Receiver Logic With Dynamic Level Recognition
· Module Supply Voltage Switch
· 3.3V Constant Voltage Source
· Remote Powering
·Polarity Independent
·Power Fail Function
· Up to 9600 Baud in Half Duplex for UART Protocol
· Slave Power Support
– Supply From Meter-Bus via Output VDD
– Supply From Meter-Bus via Output VDD or From Backup Battery
– Supply From Battery – Meter-Bus Active for Data Transmission Only

·SOP16 package

General Description
BL15721A is a single chip transceiver developed for Meter-Bus standard (EN1434-3)
applications.
The BL15721A interface circuit adjusts the different potentials between a slave system
and the Meter-Bus master. The connection to the bus is polarity independent and supports
full galvanic slave isolation with optocouplers.
The receiver has dynamic level recognition, and the transmitter has a programmable
current sink.
The circuit is supplied by the master via the bus. Therefore, this circuit offers no additional
load for the slave battery.
The BL15721A integrates a power-fail function. And a 3.3V voltage regulator, with power
reserve for a delayed switch off at bus fault, is integrated.