NCN5151MNTWG ON Semiconductor

NCN5151 Wired M-BUS Slave Transceiver with Low Power Mode Support Description www.onsemi.com The NCN5151 is a singlechip integrated slave transceiver for use in twowire Meter Bus (MBUS) slave devices and repeaters. The NCN5151 reuses the NCN5150 features and adds two low power modes: a 2wire low power mode dedicated to System for meter Communication and Readout for powerless meters (SCR) and a NQFP20 3wire low power mode allowing support for wireless applications. MN SUFFIX When configured in low power mode, the transceiver will not behave CASE 485E anymore as a constant current source in order to save energy. When configured and used in MBUS mode, the NCN5151 MARKING DIAGRAMS transceiver provides all of the functions needed to satisfy the 20 European Standards EN 137572 and EN 14343 describing the 1 physical layer requirements for MBUS. It includes a programmable NCN 5151 power level of up to 6 unit loads, which are available for use in ALYW external circuits through a 3.3 V LDO regulator. Features A = Assembly Location Singlechip MBUS Transceiver L = Wafer Lot (optional) 2 and 3Wire Low Power Modes with Selection Input Pins Y = Year W = Work Week Integrated 3.3 V VDD LDO Regulator with Extended Peak Current = Pb-free Package Capability of 15 mA Supports Powering Slave Device from the Bus Adjustable Constant Current Sink Up to 6 Unit Loads in MBus ORDERING INFORMATION Mode See detailed ordering and shipping information on page 19 of this data sheet. Adjustable Current Limit up to 2 Unit Loads in Low Power Mode Current budget of 0.88 mA minimum for external circuits Low TurnON/OFF Levels for Low Bus Voltage Operation Polarity Independent PowerFail Function (MBus 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 These are Pb-free Devices Typical Applications MultiEnergy Utility Meters Water Gas Electricity Heating systems Related Standards European Standard EN 137572, EN 14343 For more information visit www.m-bus.com Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: April, 2015 Rev. 2 NCN5151/DNCN5151 20 19 18 17 16 GND 1 15 3WLPM BUSL1 2 14 NC NCN5151 BUSL2 3 13 VIO QFN20 VB TX 4 12 PMODE 5 11 TXI 67 8 9 10 Figure 1. Pin Out NCN5151 in 20pin NQFP (Top View) Table 1. NCN5151 PINOUT Signal Name Type Pin Number Pin Description GND Ground 1 Ground BUSL1 Bus 2 Bus line. Connect to bus through series resistors. Connections are polarity independent. BUSL2 Bus 3 VB Power 4 Rectified bus voltage PMODE Output 5 Power Mode output indicating the voltage level on VB pin STC Output 6 Storage capacitor pin. Connect to bulk storage capacitor (typically 100 F 470 F, minimum 10 F). RIDD Input 7 Mark current adjustment pin. Connect to programming resistor. PF Output 8 Power Fail, active low (disabled in low power mode) SC Output 9 Mark bus voltage level storage capacitor pin. Connect to ceramic capacitor (typically 220 nF). 2WLPM Input 10 2Wire Low Power Mode selection input TXI Output 11 UART Data output (inverted) TX Output 12 UART Data output VIO Input 13 I/O pins (RX, RXI, TX, TXI, PF) high level voltage NC 14 Leave this pin floating. 3WLPM Input 15 3Wire Low Power Mode selection input VDD Power 16 Voltage regulator output. Connect to minimum 1 F decoupling capacitor. RX Input 17 UART Data input RXI Input 18 UART Data input (inverted) OD Output 19 Open Drain output (active low). Used for the slave to master communication in 3Wire Low Power mode RIS Input 20 Modulation current adjustment pin www.onsemi.com 2 STC RIS RIDD OD RXI PF SC RX 2PWLPM VDD