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.
Features
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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