NCV7748GEVB
www.onsemi.com
3
The NCV7748GEVB is capable of demonstrating:
•
Output Control
A one-way command which sets all outputs in one
virtual node (see NCP7744/D data sheet for virtual
node definition).
•
Get Status
A two-way command which requests device
diagnostics and receives a response with an in-frame
response.
•
Display of Sleep Mode
After timeout.
Practical setup limitations do not allow the display of Get
Node ID, Targeted Reset, Read by Identifier, Broadcast
Reset, and Goto Sleep on this board. A further enhanced
setup using enriched software is needed to display all device
features.
The operation of the NCV7748 evaluation board works as
a standalone presentation for the customer highlighting LIN
communication for turning on and off low-side drivers (both
1.5
W
and 0.8
W
). Dip switches provide the user
programmability for the Control Frame. Jumpers provide
convenient access to TxD, RxD, and the LIN pin which are
normally connected to the on-board microprocessor.
Jumpers are also included for use with external loads.
A jumper is included to maintain output control to avoid
going to sleep after the NCV7748 “Time to go to sleep”
electrical parameter. Pushbuttons are included for
implementing the user control of Output Control and Get
Status. Pushbuttons are also included to provide overcurrent
conditions (OCD) of the loads. A demo mode is provided via
a toggle switch.
The user must adhere to the absolute maximum ratings
when using off-board connections.
Table 2. MAXIMUM RATINGS
Rating
Value
Unit
Supply Voltage to Board (14 VDC) (Using On-board NEC Relays)
−0.3 to 16
V
Supply Voltage to Board (14 VDC) (Removing LOAD1−8 Jumpers)
−0.3 to 40
V
TxD
−0.3 to 5.25
V
RxD
−0.3 to 5.25
V
LIN
−40 to 40
V
Output Pin Voltage (OUT1− OUT8) (Removing LOAD1−8 Jumpers) Using External Loads
−0.3 to 38
V
Junction Temperature (NCV7748)
−40 to 150
°
C
Temperature (Evaluation Board)
−40 to 105
°
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 3. RECOMMENDED BOARD OPERATING CONDITIONS
Rating
Min
Max
Unit
External Supply Voltage (14 VDC)
−
16
V
Junction Temperature (NCV7748)
−40
150
°
C
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.
Table 4. PIN FUNCTION DESCRIPTION
Connector
Pin Number
Terminal Name
Description
Power
J12, J13
14 VDC
Power Supply Input Voltage (14 V)
GND
GND
Ground
Test Points
J1
LIN
LIN Bus
J2−8, J11
LOAD 1−8
On-board Relay Disconnect
J9
OUTPUT CONTROL
LIN Command for Output Control (Pushbutton Shorts to Ground)
J10
HEADER 16
Header for LCD Display
J14−J19
N/A
Board Post Mount Holes
J20−J23
N/A
LCD Display Post Mount Holes
J24
TxD
NCV7321 TxD Input
J25
RxD
NCV7321 RxD Output
