BL15721A

Features Meter-Bus Transceiver BL15721A 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. Order Information Part Number BL15721A Package SOP16 Packing Tape & Reel Tube http://www.belling.com.cn - Page 1 of 11 - Ver1.0 Pin Diagram Block Diagram BL15721A Pin Description Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13...