NCN5121 is a receiver-transmitter IC suitable for use in KNX twisted pair networks (KNX TP1-256). It supports the connection of actuators, sensors, microcontrollers, switches or other applications in a building network. NCN5121 handles the transmission and reception of data on the bus. It generates from the unregulated bus voltage stabilized voltages for its own power needs as well as to power external devices, for example, a microcontroller. NCN5121 assures safe coupling to and decoupling from the bus. Bus monitoring warns the external microcontroller in case of loss of power so that critical data can be stored in time.
9600 baud KNX Communication Speed Supervision of KNX Bus Voltage and Current Supports Bus Current Consumption up to 24 mA High Efficient DC-DC Converters 3.3 V Fixed 1.2 V to 21 V Selectable Control and Monitoring of Power Regulators Linear 20 V Regulator Buffering of Sent Data Frames (Extended Frames Supported) Selectable UART or SPI Interface to Host Controller Selectable UART and SPI baud Rate to Host Controller Optional CRC on UART to the Host Optional Received Frame-end with MARKER Service Optional Direct Analog Signaling to Host Operates with Industry Standard Low Cost 16 MHz Quartz Generates Clock of 8 or 16 MHz for External Devices Auto Acknowledge (optional) Auto Polling (optional) Temperature Monitoring Extended Operating Temperature Range -40°C to +105°C These Devices are Pb-Free and are RoHS Compliant