Overview
The MS721 is a single chip transceiver developed for M-Bus standard (EN1434-3) applications. The MS721 interface circuit can accommodate the voltage difference between slave and master systems. The bus connection has no polarity demand. The circuit is supplied by the master via the bus. Therefore, no additional load is increased for the slave battery. A power-fail function is integrated. The receiver has dynamic level recognition, and the transmitter has a
programmable current source. The MS721 also integrates a 3.3V voltage regulator. After bus fault occurs, the MS721 is in shutdown for delaying over a period of time.
Key Features
- ⚫ Meet EN1434-3 Standard (for Slave)
- ⚫ Receiver Logic with Dynamic Level Recognition
- ⚫ Adjustable Receiving Current via Resistor
- ⚫ No Polarity Connection
- ⚫ Power-Fail Function
- ⚫ Module Voltage Switch
- ⚫ 3.3V Voltage Source
- ⚫ Remote Supply
- ⚫ Up to 9600 Baud in Half Duplex for UART Protocol
- ⚫ Selection for Slave Power:
- – Supply From M-Bus via Output VDD
- – Supply From M-Bus via Output VDD or From Backup Battery
- – Supply From Battery
- - M-Bus Active for Only Data Transmission
Key Features
M-Bus slave interface circuit
