The NCN5151 is a single-chip integrated slave transceiver for use in 2-wire Meter Bus (M-BUS) slave devices and repeaters. The NCN5151 reuses the NCN5150 features and adds two lowpower modes: a 2-wire low power mode dedicated to System for meter Communication and Readout for powerless meters (SCR) and a 3-wire low power mode allowing support for wireless applications. When configured in low power mode, the transceiver will not behave anymore as a constant current source in order to save energy. When configured and used in M-BUS mode, the NCN5151 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 6 unit loads, which are available for use in external circuits through a 3.3 V LDO regulator.

• Single-chip M-BUS transceiver
• 2 and 3-Wire low power modes with selection input pins
• Integrated 3.3V VDD LDO regulator with extended peak current capability of 15 mA
• Supports powering slave device from the bus
• Adjustable constant current sink up to 6 units load in M-Bus mode
• Adjustable current limit up to 2 unit loads in low power mode
• Current budget of 0.88 mA minimum for external circuits
• Low turn ON/OFF levels for low bus voltage operation
• Polarity independent
• Power-Fail function (M-BUS mode)
• UART communication speeds up to 38400 baud
• Fast Startup - no external transistor required on STC pin
• Industrial ambient temperature range of -40C to +85C
• These are Pb-free devices