NCV7471B5V1GEVB,
NCV7471C5V1GEVB,
NCV7471C5V2GEVB
NCV7471 System Basis
Chip Evaluation Board
User's Manual
Introduction
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EVAL BOARD USER’S MANUAL
Evaluation Board Features
This document describes the NCV7471 EVB board for the
ON Semiconductor NCV7471 System basis chip with a
high−speed CAN and two LIN transceivers with boost−buck
converter and low−drop voltage regulator. The functionality
and major parameters can be evaluated with the NCV7471
EVB board.
NCV7471 is a System Basis Chip (SBC) integrating
functions typically found in automotive Electronic Control
Units (ECUs) in the body domain. NCV7471 provides and
monitors the low−voltage power supplies for the application
microcontroller and other loads, monitors the application
software via a watchdog and includes high−speed CAN and
LIN transceivers allowing the ECU to host multiple
communication nodes or to act as a gateway unit. The
on−chip state controller ensures safe power−up sequence
and supports low−power modes with a configurable set of
features including wakeup from the communication buses
or by a local digital signal WU. The status of several
NCV7471 internal blocks can be read by the microcontroller
through the serial peripheral interface or can be used to
generate an interrupt request.
•
One−row Pin Header, Providing the Circuit Signals,
•
•
•
•
•
•
•
•
•
•
Enables Easy Insertion of the Evaluation Board into a
more Complex Application Setup
Oscilloscope Test−points on All Important Signals
Reverse Protection and Decoupling on the Main
(Battery) Supply
All the Necessary VOUT Converter External
Components – Assembly Options Available
Decoupling on VOUT Converter and VOUT2
Regulator Outputs
Additional Pull−up Resistors on the Open−drain Digital
Outputs (RSTN, INTN, UVN_VOUT)
Filtering Circuit on the Switch−monitoring WAKE
Input
On−board Local Wakeup Switch
CAN/LIN−bus Terminations
Good Thermal Connection of the Circuit’s Exposed Pad
to the Bottom Ground Plane
Basic Standalone Functionality using Software
Development Mode
Figure 1. Evaluation Board Photo
©
Semiconductor Components Industries, LLC, 2014
1
July, 2018 − Rev. 2
Publication Order Number:
EVBUM2219/D
NCV7471B5V1GEVB, NCV7471C5V1GEVB, NCV7471C5V2GEVB
SCHEMATIC
Complete schematic with all the assembly options are
shown in Figure 2. Depending on VOUT maximum current
and minimum battery operation voltage, few assembly
options are available. Values of components may be
customized according to specific requirements.
Figure 2. NCV7471 Evaluation Board Schematic
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NCV7471B5V1GEVB, NCV7471C5V1GEVB, NCV7471C5V2GEVB
Table 1. ABSOLUTE MAXIMUM RATINGS
Rating
Supply voltage
VOUT output voltage
VOUT output current
VOUT2 output voltage
VOUT2 output current
Digital inputs voltage
Digital outputs voltage
Fail−safe pin output voltage
LIN bus lines voltage
CAN bus lines voltage
Wake−up input voltage
NCV7471 junction temperature
Board temperature
Pins
Vbat
VOUT
VOUT
VOUT2
VOUT2
RSTN, INTN, UVN, SDI, SCK, CSN,
TxDC, TxDL1/2
SDO, RxDC, RxDL1/2
FSO
LIN1, LIN2
CANH, CANL
WU
Min
−40
−0.3
0
−1
0
−0.3
−0.3
−0.3
−45
−50
−40
−40
−40
Max
40
6
internally limited
40
internally limited
6
VOUT+0.3
40
45
50
40
+170
+125
Unit
V
V
mA
V
mA
V
V
V
V
V
V
°C
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 2. RECOMMENDED BOARD OPERATING CONDITIONS
Rating
Supply voltage (Vbat)
Pins
Vbat
NCV7471B5V1GEVB
NCV7471C5V1GEVB
NCV7471C5V2GEVB
VS (board internal node)
NCV7471B5V1GEVB
NCV7471C5V1GEVB
NCV7471C5V2GEVB
VOUT
VOUT
NCV7471B5V1GEVB
NCV7471C5V1GEVB
NCV7471C5V2GEVB
VOUT2
VOUT2
RSTN, INTN, UVN, SDI, SCK, CSN,
TxDC, TxDL1/2
SDO, RxDC, RxDL1/2
FSO
LIN1, LIN2
CANH, CANL
WU
Min
6.6
3.8
3.0
28
6.0
3.3
2.5
4.9
0
250
250
500
4.9
0
0
0
0
0
0
0
−40
−40
5.1
50
VOUT
VOUT
VS
VBAT
5
VBAT
+150
+105
V
mA
V
V
V
V
V
V
°C
°C
5.1
V
mA
V
Max
28
Unit
V
Supply voltage (VS)
VOUT output voltage
VOUT output current
VOUT2 output voltage
VOUT2 output current
Digital inputs voltage
Digital outputs voltage
FSO pin output voltage
LIN bus lines voltage
CAN bus lines voltage
Wake−up input voltage
NCV7471 junction temperature
Board temperature
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
*See assembly options
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NCV7471B5V1GEVB, NCV7471C5V1GEVB, NCV7471C5V2GEVB
OPERATIONAL GUIDELINES
NCV7471 is complex SCB device, which needs external
MCU, connected through H1 connector, to control all
functions and settings. However, with basic function of the
converter, LIN and CAN operation, NCV7471 may work in
so called Software Development Mode (SWDM). To
configure NCV7471 into this mode, SWDM pin has to be
tight to VS. Details about board configuration can be found
in the following chapter.
Behavior of NCV7174 in Software Development mode is
following:
•
Buck converter is active, delivering +5 V on VOUT.
•
Boost converter may be disabled/enabled by connecting
CFG pin to GND/VS (“−”/“+” positions of CFG
soldering strap)
•
VOUT2 LDO is disabled by default
Table 3. SOLDERING STRAPS FUNCTIONS
Solder Strap
SWDM
Position
“−” or not connected
(GND)
“+”
(VS)
CFG
“−” or not connected
(GND)
“+”
(VS)
VS_VOUT2
VS
VMID
FSO1−3
FSO1
FSO2
FSO3
Function
Normal operation mode with external MCU connected (Watchdog service needed)
Software Development Mode (Watchdog does not need to be served, CAN and LIN1/2
enabled in Normal mode by default)
SWDM = GND:
Config2/4 (Fail−safe mode entered after 1
st
/2
nd
watchdog service failure)
SWDM = VS:
Boost stage disabled
SWDM = GND:
Config1/3 (Fail−safe mode not entered after 1
st
/2
nd
watchdog service
failure)
SWDM = VS:
Boost stage enabled
Input of VOUT2 LDO regulator connected to VS
Input of VOUT2 LDO regulator connected to V_MID
FSO constantly Low at failure
FSO Low for 50%, frequency of 1.25 Hz at failure
FSO Low for 20%, frequency of 100 Hz at failure
•
CAN transceiver is configured into LIN Normal mode
– receiver and transmitter are enabled.
•
LIN1/2 transceiver is configured into LIN Normal
mode – receiver and transmitter are enabled.
•
Watchdog does not need to be served, the device
remains in Normal mode, until it is changed via SPI
command.
•
RSTN, INTN, VOUT_UVN, FSO1−3 provide their
standard functionality, except of RSTN and FSO1−3
pins, which are not active due to not−serving the
watchdog.
Board Configuration
The NCV7471 evaluation board provides few hardware
configuration options, using soldering straps. Their
functions are described in the table below.
Special care has to be taken for Standby or Sleep mode
quiescent consumption measurements. Both SWDM and
CFG pins have internal pull−down resistors (typ. 100 kW),
which influence input supply current if they are connected
to VS (typically Software Development Mode with Boost
stage enabled). To measure pure NCV7471 consumption,
these pins should stay Low (GND) or may be pulled up by
external voltage source.
Four on−board LEDs indicate faulty states of the board, as
described in the Table 4.
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NCV7471B5V1GEVB, NCV7471C5V1GEVB, NCV7471C5V2GEVB
Table 4. LED FUNCTIONS
LED Name
LED_RSTN
Function
Indicates activation of RSTN pin due to the following reasons:
•
Sleep/Fail−safe mode (LED_RSTN off due to missing VOUT supply),
•
Reset mode (internal or external activation) (5 ms on)
Indicates activation of INTN pin due to the following reasons:
•
Sleep/Fail−safe mode (LED_INTN off due to missing VOUT supply),
•
Wake−up event (CAN, LIN1/2, WU, Timer) – configurable via SPI
•
Interrupt request – has to be enabled via SPI (1 ms on, 5 ms off)
Indicates activation of VOUT_UVN pin due to the following reasons:
•
Sleep/Fail−safe mode (LED_UVN off due to missing VOUT supply),
•
Undervoltage on VOUT pin (VOUT < 4.65 V)
FSOx pin active due to failure condition (depends on CFG and SPI configuration):
•
Thermal Shutdown
•
Fatal VOUT failure
•
RSTN clamped Low / High
•
Watchdog failure (ignored if SWDM is High)
•
SPI control bit FSO_ON is set
LED_INTN
LED_UVN
LED_FSO
External Board Connections
Configuration with and without the control MCU is
shown in the figures below. SWDM and CFG soldering
straps need to be configured to work correctly in both setups.
For basic evaluation, the board may operate without
external control in the Software Development Mode
(Figure 3). If full functionality is needed, an external
microcontroller has to be attached to the board (Figure 4).
VCC
SPI
MCU
CAN
LIN1
LIN2
GND
CAN
LIN1
LIN2
FSO electronic
sensor
GND
VBAT
CANL
CANH
LIN1
LIN2
GND
VBAT
CANL
CANH
LIN1
LIN2
Figure 3. Standalone NCV7471 Evaluation Setup
(Software Development Mode used, limited
functionality)
Figure 4. NCV 7471 Full Evaluation Setup
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