The NCN5150 is a single-chip integrated slave transceiver for use in two-wire Meter Bus (M-BUS) slave devices and repeaters. The transceiver provides all of the functions needed to satisfy the European Standards EN 13757-2 and EN 1434-3 describing the physical layer requirements for M-BUS. It includes a programmable power level of up to 2 (SOIC version) or 6 (NQFP version) unit loads which are available for use in external circuits through a 3.3V LDO regulator.
The NCN5150 can provide communication up to the maximum M-BUS communication speed of 38400 baud (half-duplex).

• Single-chip M-Bus transceiver
• UART communication speeds up to 38400 baud
• Integrated 3.3 V VDD LDO regulator with extended peak current capability of 15 mA
• Supports powering slave device from the bus or from external power supply
• Adjustable I/O levels
• Adjustable constant current sink up to 2 or 6 unit loads depending on the package
• Low bus voltage operation
• Extended current budget for external circuits: at least 0.88 mA
• Polarity independent
• Power-fail function
• Fast startup - no external transistor required on STC pin
• Industrial ambient temperature range of -40C to +85C
• Available in:
• - 16-pin SOIC (pin-to-pin compatible with TSS721A)
• - 20-pin QFN
• These are Pb-free devices