NCN5121MNTWG

NCN5121 is a transceiver IC for KNX twisted-pair networks (KNXTP1-256). It supports connecting actuators, sensors, microcontrollers, switches, or other applications in building networks. NCN5121 handles data transmission and reception on the bus. It regulates voltage from the unregulated bus voltage to meet its own power requirements while supplying power to external devices such as microcontrollers. NCN5121 ensures safe coupling to and decoupling from the bus. During power failure, the bus monitor issues a warning to the external microcontroller so that critical data can be saved in real time.

Key features

• 9600 baud KNX communication speed
• KNX bus voltage and current monitoring
• Supported bus current consumption up to 24 mA
• Efficient DC-DC converter, fixed 3.3V, adjustable 1.2V to 21V
• Power regulator control and monitoring
• Linear 20V regulator
• Transmitted data frame buffering (extended frame support)
• Selectable UART or SPI interface to host controller
• Selectable UART and SPI baud rate to host controller
• Optional CRC on UART to host
• Optional end-of-received-frame with MARKER service
• Optional direct analog signal to host
• Operating with industry-standard low-cost 16 MHz crystal
• 8 or 16 MHz clock generation for external devices
• Auto-acknowledge (optional)
• Auto-polling (optional)
• Temperature monitoring
• Extended operating temperature range: -40°C to +105°C
• Lead-free and RoHS compliant devices