The NCN5120 is the first IC from ON Semiconductor's family of KNX transceivers, handling the transmission and reception of data on the bus. It integrates a 20 V regulator and two high efficient DC-DC converters generating a fixed 3.3 V and a selectable 3.3 to 21 V regulated voltage from the bus with 100 mA drive capability each. This transceiver is ideal for high power applications and has been designed to reduce the bill of materials while supporting safe and reliable coupling to the bus thanks to features such as selectable current slope, bus voltage and temperature monitoring.

• KNX certified EIB transceiver with embedded PHY and MAC layers (TP1-256)
• KNX communication speed of 9600 Bauds
• Two high efficient DC-DC converters generating board supply:
• - DC-DC1 : fixed 3.3 V
• - DC-DC2 : adjustable between 3.3 and 21 V
• 20 V linear regulator
• Configurable fan-in model (up to 2 virtual nodes) and current slopes
• Supervision of KNX bus voltage
• Control and monitoring of the DC-DC converters
• Configurable amount of repetition
• Buffering of sent data frames
• Optional auto acknowledge
• Supports Analog Mode
• Supports Sleep Mode
• Selectable UART/SPI interfaceandbaud rate to Host Controller
• Comprehensive clocking system
• - Operates with industry standard low cost 16 MHz quartz
• - Can generate 8/16 MHz clock for the external MCU
• Operating temperature range -25 C to +85 C
• Household appliances