NCN5121 Transceiver for KNX Twisted Pair Networks Introduction NCN5121 is a receivertransmitter IC suitable for use in KNX twisted pair networks (KNX TP1256). It supports the connection of www.onsemi.com 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 QFN40 own power needs as well as to power external devices, for example, a MN SUFFIX CASE 485AU microcontroller. 1 40 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. MARKING DIAGRAM Key Features 9600 baud KNX Communication Speed Supervision of KNX Bus Voltage and Current NCN5121 Supports Bus Current Consumption up to 24 mA 21420005 AWLYYWWG High Efficient DCDC Converters 3.3 V Fixed 1.2 V to 21 V Selectable A = Assembly Location Control and Monitoring of Power Regulators WL = Wafer Lot YY = Year Linear 20 V Regulator WW = Work Week Buffering of Sent Data Frames (Extended Frames Supported) G = PbFree Package Selectable UART or SPI Interface to Host Controller Selectable UART and SPI baud Rate to Host Controller Optional CRC on UART to the Host ORDERING INFORMATION See detailed ordering and shipping information in the package Optional Received Frameend with MARKER Service dimensions section on page 57 of this data sheet. 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 40C to +105C These Devices are PbFree and are RoHS Compliant Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: August, 2019 Rev. 2 NCN5121/DNCN5121 BLOCK DIAGRAM CEQ1 CEQ2 VFILT TRIG VDDA VSSA VDDD VSSD Bus Coupler CAV SCK/UC2 UART Impedance VBUS1 SDI/RXD Control KNX SDO/TXD DLL Receiver CSB/UC1 SPI CCP TREQ MODE1 Mode Transmitter MODE2 TXO VBUS2 VIN NCN5121 VSW1 FanIn FANIN DC/DC Control VDD1M Converter 1 VDD1 VSS1 20V LDO V20V RC POR OSC XTAL1 VSW2 OSC XTAL2 VDD2MC TW DC/DC UVD TSD Converter 2 VDD2MV XSEL VDD2 ANALOG VSS2 Diagnostics BUFFER XCLKC XCLK ANAOUT SAVEB RESETB Figure 1. Block Diagram NCN5121 PIN OUT VSSA 1 30 VDDD VBUS2 2 29 SCK/UC2 TXO 3 SDO/TXD 28 CCP SDI/RXD 4 27 CAV 5 26 CSB/UC1 NCN5121 VBUS1 6 25 TREQ CEQ1 7 MODE2 24 CEQ2 8 23 MODE1 VFILT 9 22 TRIG V20V 10 XCLKC 21 Figure 2. Pin Out NCN5121 (Top View) www.onsemi.com 2 VDD2MV 11 VDDA 40 VDD2MC ANAOUT 12 39 VDD2 13 38 FANIN VSS2 14 37 RESETB VSW2 15 SAVEB 36 VIN 16 35 XTAL1 VSW1 17 34 XTAL2 VSS1 18 XSEL 33 VDD1 XCLK 19 32 VDD1M VSSD 20 31 Interface Controller