ON Semiconductor NCV7425EVB User Manual
NCV7425EVB
NCV7425 LIN Transceiver
with Voltage Regulator and
Reset Pin Evaluation Board
User's Manual
http://onsemi.com
EVAL BOARD USER’S MANUAL
Introduction
This document describes the NCV7425EVB board for the
ON Semiconductor NCV7425 LIN Transceiver with
Voltage Regulator and Reset pin. The functionality and
major parameters can be evaluated with the NCV7425EVB
board.
The NCV7425 is a fully featured local interconnect
network (LIN) transceiver designed to interface between a
LIN protocol controller and the physical bus.
The NCV7425 LIN device is a member of the in-vehicle
networking (IVN) transceiver family of ON Semiconductor
that integrates a LIN v2.1 physical transceiver and a
low-drop voltage regulator. It is designed to work in harsh
automotive environment and is submitted to the TS16949
qualification flow.
Evaluation Board Features
One-row Pin Header Connecting to all Circuit Signals
Enables Easy Insertion of the Evaluation Board into a
more Complex Application Setup. The Header can be
Alternatively Assembled either Perpendicular or
Parallel with the Board Plane
Oscilloscope Test-points on All Circuit Signals
Reverse Protection and Decoupling on the Main
(Battery) Supply
Decoupling on VCC Regulator Output
Additional Pull-up Resistor on the RSTN Open-drain
Output
Filtering Circuit on the Switch-monitoring WAKE
Input
On-board Local Wakeup Switch
LIN-bus Termination and Optional ESD Protection
Good Thermal Connection of the Circuit’s Exposed Pad
to the Bottom Ground Plane
NCV7425 Key Features
LIN-Bus Transceiver
LIN Compliant to Specification Revision 2.1
(Backward Compatible to Versions 2.0 and 1.3)
and SAE J2602
Bus Voltage 45 V
Transmission Rate up to 20 kBaud
Integrated Slope Control for Improved EMI
Compatibility
Protection
Thermal Shutdown
Indefinite Short-circuit Protection on Pins LIN
and WAKE Towards Supply and Ground
Load Dump Protection (45 V)
Bus Pins Protected against Transients in an
Automotive Environment
ESD Protection Level for LIN, INH, WAKE and
Vbb up to 10 kV
Voltage Regulator
Two Device Versions: Output Voltage 3.3 V or 5 V
for Loads up to 150 mA
Under-voltage Detector with a Reset Output to the
Supplied Microcontroller
Over-current Limitation
INH Output for Auxiliary Purposes (Switching of an
External Pull-up or Resistive Divider towards
Battery, Control of an External Voltage Regulator
etc.)
Typical Applications
Automotive
Industrial Network
Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. 0
1 Publication Order Number:
EVBUM2045/D
NCV7425EVB
NCV7425 PIN CONNECTIONS
Figure 1. NCV7425EVB
Getting Started
Master/Slave Configuration
The NCV7425 evaluation board can be configured as
Master or Slave node. Furthermore, Master node LIN bus
pull-up resistance (R
) can be tied to VBB supply line or
LIN
to INH pin (See the figures below).
VBB
VBB
V
BB
LIN
GND
GND
WAKE
INH
OTP_SUP
N.C.
1
2
3
4
5
6
710
89
SOIC−16 LEAD
WIDE BODY
EXPOSED PAD
CASE 751AG
NCV7425
16
15
14
13
12
11
V
CC
RxD
TxD
RSTN
STB
EN
TEST
N.C.
The EMC immunity of the Master-node device can be
further enhanced by adding a capacitor between the LIN
output and ground (C
). The optimum value of this
LIN
capacitor is determined by the length and capacitance of the
LIN bus, the number and capacitance of Slave devices, the
pull-up resistance of all devices (Master and Slave), and the
required time constant of the system.
VBB
LIN Bus
VBB
INH
R
LIN
C
LIN
NCV7425
LIN
LIN Bus
R
LIN
C
LIN
INH
NCV7425
LIN
VBB
LIN Bus
VBB
INH
NCV7425
LIN
C
LIN
Figure 2. Master with Pull-up to VBB Figure 3. Master with Pull-up to INH Figure 4. Slave Configuration
Basic Connection
A simple LIN network configuration is shown in the
figure below. One Master and one Slave node is required
(Master/Slave Configuration).
VBAT
LIN
GND
GND
MCU
VCC
MASTER Node
MASTER
GND
MCU
VCC
SLAVE Node
SLAVE
Figure 5. NCV7425 Evaluation Setup Connection
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