Document
NCN5151
Wired M-BUS Slave Transceiver with Low Power Mode Support
Description The NCN5151 is a single−chip integrated slave transceiver for use
in two−wire Meter Bus (M−BUS) slave devices and repeaters. The NCN5151 reuses the NCN5150 features and adds two low
power modes: a 2−wire low power mode dedicated to System for meter Communication and Readout for powerless meters (SCR) and a 3−wire low power mode allowing support for wireless applications. When configured in low power mode, the transceiver will not behave anymore as a constant current source in order to save energy.
When configured and used in M−BUS mode, the NCN5151 transceiver provides all of the functions needed to satisfy the European Standards EN 13757−2 and EN 1434−3 describing the physical layer requirements for M−BUS. It includes a programmable power level of up to 6 unit loads, which are available for use in external circuits through a 3.3 V LDO regulator.
Features
• Single−chip M−BUS Transceiver • 2 and 3−Wire Low Power Modes with Selection Input Pins • Integrated 3.3 V VDD LDO Regulator with Extended Peak Current
Capability of 15 mA
• Supports Powering Slave Device from the Bus • Adjustable Constant Current Sink Up to 6 Unit Loads in M−Bus
Mode
• Adjustable Current Limit up to 2 Unit Loads in Low Power Mode • Current budget of 0.88 mA minimum for external circuits • Low Turn−ON/OFF Levels for Low Bus Voltage Operation • Polarity Independent • Power−Fail Function (M−Bus mode) • UART Communication Speeds up to 38400 baud • Fast Startup − No External Transistor Required on STC Pin • Industrial Ambient Temperature Range of −40°C to +85°C • These are Pb-free Devices
Typical Applications
• Multi−Energy Utility Meters
♦ Water ♦ Gas ♦ Electricity ♦ Heating systems
Related Standards − European Standard EN 13757−2, EN 1434−3 For more information visit www.m-bus.com
www.onsemi.com
NQFP−20 MN SUFFIX CASE 485E
MARKING DIAGRAMS 20
1 NCN 5151 ALYW G
A = Assembly Location L = Wafer Lot (optional) Y = Year W = Work Week G = Pb-free Package
ORDERING INFORMATION
See detailed ordering and shipping information on page 19 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April, 2015 − Rev. 2
1
Publication Order Number: NCN5151/D
NCN5151
RIS OD RXI RX VDD
GND 1 BUSL1 2 BUSL2 3
VB 4 PMODE 5
20 19 18 17 16
NCN5151 QFN20
15 3WLPM 14 NC 13 VIO 12 TX
11 TXI
6 7 8 9 10
STC RIDD
PF SC 2PWLPM
Figure 1. Pin Out NCN5151 in 20−pin NQFP (Top View)
Table 1. NCN5151 PINOUT
Signal Name
Type
Pin Number
Pin Description
GND
Ground
1 Ground
BUSL1 BUSL2
Bus Bus
2 Bus line. Connect to bus through series resistors. Connections are polarity independent.
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 mF − 470 mF, minimum 10 mF).
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 2−Wire 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 3−Wire Low Power Mode selection input
VDD
Power
16 Voltage regulator output. Connect to minimum 1 mF 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 3−Wire
Low Power mode
RIS
Input
20 Modulation current adjustment pin
www.onsemi.com 2
13 VIO
5 PMODE
4 VB
RIDD STC
7 6
16 VDD
2WLPM 10 3WLPM 15
NCN5151
PF 8
VIO Buffer
VIO_BUF
LP_TX
VB Monitor
Power Fail
Detect
VB_INT
3−Wire LPM Transmitter
CS1
STC Clamp
3.3 V LDO & POR
Low Power Logic
STC Voltage Monitor
LP_CTL
LP_TX
VIO_BUF Receiver
ECHO Transmitter
19 OD
2 BUSL1
3 BUSL2
9 SC
11 TXI
12 TX
17 RX
18 RXI
CS_TX 1 20
Thermal Shutdown
GND
RIS
Figure 2. NCN5151 Block Diagram
NCN5151 PC20130527.1
www.onsemi.com 3
NCN5151
Table 2. ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Min Max Unit
TJ Junction temperature
−40
+150
°C
TS Storage temperature
−55
+150
°C
VBUS
VTX, VTXI
VRX, VRXI, VIO
Bus voltage (|BUSL1 − BUSL2|) Voltage on pin TX, TXI Voltage on pin RX, RXI, VIO
−50 50 V −0.3 7.5 V −0.3 5.5 V
VOD Voltage on pin OD
−0.3 40 V
V3WLPM Voltage on pin 3WLPM
−0.3 3.6 V
V2WLPM Voltage on pin 2WLPM
−0.3 3.6 V
VPMODE Voltage on pin PMODE
−0.3 3.6 V
ESDHBM ESD Rating − Human Body Model
4.0 − kV
ESDMM ESD Rating − Machine Model
250 − V
ESDCDM ESD Rating − Charged Device Model
750 − V
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should n.