ON Semiconductor NCV7748 Manual de usuario

©Semiconductor Components Industries, LLC, 2016

July, 2016 − Rev. 0 1Publication Order Number:

EVBUM2484/D

NCV7748GEVB

NCV7748 Evaluation Board

User's Manual

Eight Channel Low-Side Relay Drivers

with LIN Communication

Description

The NCV7748 is an octal low-side relay driver for automotive

applications targeted for use in a Power Distribution Box (PDB).

Communication to the device is through a LIN bus compliant to SAE

J2602 and LIN 2.x. All drivers have passive output clamps for limiting

output voltage spikes during flyback events during inductive relay

turn-off events.

This evaluation board is intended for evaluation of the output

drivers, and highlights many of the features of the device.

The NCV7748 has two types of low-side drivers. One is intended to

run outside of the module and the other is targeted for use inside the

module. All outputs have Overcurrent Detection, but the output

drivers intended for use external to the module (OUT4, OUT8) have

added Open Load detection and individual Overtemperature (Thermal

Shutdown) detection. The evaluation board includes NEC EX2

automotive relay loads, with the option to disconnect these loads and

use customer defined external loads.

Output control is interfaced with the use of dip switches and

a push-button. Output Control Commands as well as Output errors can

be read from the LCD display. Truth tables are included in silk screen

on the PCB for ease of use for both command control and error

deciphering.

Features

•Individual Output Drive Control

•On-board Relay Demonstration with Option for Off-board

Connections

•Get Status Request for Error Reporting from ERR and APPINFO

Registers

Application

The NCV7748 device includes 8 low-side drivers. Each includes an

output clamp for inductive loads. A 41 V (typ) clamp from the drain to

gate of the output driver helps protect the output driver from seeing

excessive voltage during a flyback event from an inductive load. The

minimum specification for the clamp voltage is 38 V. It is important to

limit external DC supply voltages to less than 38 V to avoid a high

power situation.

Primary target loads are coils of relays for a power distribution box

(PDB). These can include, but not limited to loads for Engine Control

Unit (ECU), Windshield Wipers, Sunroof, Cruise Control, Rear

Window Defroster, Fog Lights, Cooling Fans, Ignition, Headlights,

Tail Lights, Hazard Lights, Horn, Cooling Fan, Cluster, Heated

Mirror, External Accessory Voltage, Instrument Cluster, Keyless

Entry, Fuel Pump, etc.

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EVAL BOARD USER’S MANUAL

Figure 1. NCV7748 Evaluation Board

Figure 2. 1.5 WOutput Drivers

Figure 3. 0.8 WOutput Drivers

OUT

1.5 W

(Typ)

OUT

41 V

(Typ)

Over CurrentFault

0.8 W

(Typ)

41 V

(Typ) OUT

OUT

Thermal Shutdown

Over Current

Open Load

Fault

NCV7748GEVB

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Communication

The NCV7748 utilizes a LIN protocol for all

communication. LIN is a single wire communication

network which utilizes a master/slave configuration. The

NCV7748 is the slave and receives its commands from an

external master device and also reports on the same pin

(LIN) to the master device after a request is made. Figure 4

shows the basic LIN schematic. The LIN bus is driven high

through a 30 kWresistor in series with a diode and its read

capability is filtered to an internal RxD comparator.

Figure 4. LIN Controller

−

From NAD Register

LIN Address

LIN

VBB

RxD

TxD

Filter

Slope

Control

LIN

Protocol

Handler

Control

Block

30 kW

A table (Table 1) of supported commands of the

NCV7748 is listed below from the NCP7744/D data sheet.

Note the NCV7744 reference is to a sister part which is

comprised of 4 outputs instead of the 8 outputs of the

NCV7748.

Table 1. SUPPORTED LIN COMMANDS

PID[7:0] Frame Type Description Data Length Spec

Depends on NAD Output Control Sets all outputs in one virtual node. 8 N/A

Depends on NAD Get Node ID Reads identity of prime device in virtual node.

(In frame slave Response) 8 N/A

Depends on Rconfig

and NAD Get Status Reads diagnostics of one device (LS driver).

(In frame slave Response) 8 N/A

0x3C Targeted Reset

Master Request Re-initialization of one virtual node.

This includes all devices on the virtual node. 8J2602−1

0x7D Targeted Reset

Slave Response Positive response by prime device. 8

0x3C Read by Identifier

Master Request Reads identity of device supplier. 8LIN2.2

0x7D Read by Identifier

Slave Response Successfully processed request. 8

Slave could not process the request. 8

0x3C Broadcast Reset Re-initialization of all nodes. 8J2602−1

0x3C Goto Sleep All devices enters Sleep Mode. 8 LIN2.2

NCV7748GEVB

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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 Wand 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

NCV7748GEVB

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User Interface Locations

Figure 5 shows all the user interface locations. This lists

all the user options available on the evaluation board.

Figure 5. User Interface Locations

22222

1. OUT1−8 External Post Connections

2. External Relay Jumpers

3. Overcurrent (OCD) Pushbuttons

4. TxD, RxD Jumpers

5. LIN Test Point

6. Output Control Command Input Data

7. Output Control Pushbutton

8. LOOP Jumper for Continuous Operation

without Four Second Timeout

9. Get Status Pushbutton

10. Demo Mode Toggle Switch

11. 14 VDC Power Supply Inputs

12. LIN Auxiliary Input

NCV7748GEVB

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OPERATIONAL GUIDELINES

The material necessary to successfully use the evaluation

board is listed below.

•NCV7748 Evaluation Board

•14 V Power Supply Capable of Drive 1 A

Configure the Board

Typical Board Configuration with On-board Components

1. Connect all jumpers on the board with the

exception of the LOOP jumper (J9) for output

control. This jumper is located directly next to the

OUTPUT CONTROL pushbutton.

2. Set the DEMO MODE toggle switch OFF.

Demo Mode

1. Configure the board as per above.

2. Connect the 14 V power supply.

3. Turn on the power supply.

4. The splash screen will be shown (see Figure 6).

5. Move the DEMO MODE toggle switch to the ON

position.

Figure 6. Splash Screen

At this point, the relays will individually sequence from

OUT1 to OUT8 and repeat. This is indicated on the board

with the illumination of the LEDs connected to the outputs

of the relays. Figure 7 shows the board when OUT2 is

illuminated. This will continue indefinitely. Switching the

demo mode toggle switch off, the sequence will continue

and stop on OUT8 until the NCV7748 device times out and

OUT8 will also turn off.

Figure 7. Sequencing Demo Mode

Normal Operation

1. Move the DEMO MODE toggle switch to the OFF

mode.

2. This sets the NCV7748 ready to receive LIN

commands from the on-board microprocessor.

3. Set the DIP switches using the OUTPUT

CONTROL COMMAND for DATA 1 and

DATA 2 for the targeted outputs and the OUTPUT

ENCODING for the output state. In this mode,

DATA 3 will always display all zeros.

4. Press the OUTPUT CONTROL pushbutton

(Figure 9) located to the left of the DIP switches.

5. The selected outputs will turn on.

NOTE: Figure 8 displays the setup for all 8

outputs to turn on.

NOTE: Figure 12 highlights the dip switches

settings and the resultant display of the settings.

All selected outputs will remain illuminated until

the NCV7748 sleep timer has expired. This is

indicative of no communication on the LIN bus.

When the sleep timer expires, all outputs will turn

off. When in sleep mode, a GET STATUS

command will display “Sleep Mode”. All 1’s are

displayed (Figure 10) because the bus is recessive

in sleep mode.

6. To circumvent the sleep timer and maintain

a continuous output state, connect the jumper

(LOOP) next to the OUTPUT CONTROL

pushbutton (see Figure 9). This will repeatedly

send LIN commands. As a result the device will

not go to sleep. DIP switch activity is allowed with

the loop jumper connected. This allows for real

time switching selection of the output drivers.

NCV7748GEVB

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Figure 8. OUTPUT CONTROL DIP Switches

(All Outputs On)

Figure 9. OUTPUT CONTROL Button

Figure 10. Sleep Mode

Figure 11. OUTPUT CONTROL and OUTPUT

ENCODING

Output Control Command

DATA_1 OUT4_A OUT3_A OUT2_A OUT1_A

Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0

DATA_2 OUT8_A OUT7_A OUT6_A OUT5_A

DATA_3 OUT4_B OUT3_B OUT2_B OUT1_B

Output Encoding (DIP Switches)

0 0 No Change

OUTx_A[1] OUTx_A[0] Output

0 1 OUT x Off

1 0 OUT x On

1 1 No Change

Figure 12. OUTPUT CONTROL Display

NCV7748GEVB

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GET STATUS

To retrieve the outputs status including the state of the

output and any information stored in the error field and

APPINFO registers, simply press the GET STATUS button

located directly below the OUTPUT CONTROL button.

Note, if you have the LOOP jumper connected, the GET

STATUS information will only be displayed while the

button is depressed. Remove the LOOP jumper if

a continuous display of error information is desired.

All zeros in the ERR and APPINFO register are indicative

of normal operation with no issues.

Errors which can be detected on this board include:

ERR1. No Error.

2. Reset. A reset error will be displayed with VBB

por.

3. Byte Field Framing Error. An error can be seen

here when there is conflict on the bus such as

when two opposing signals are sent from DEMO

MODE and OUTPUT CONTROL followed by

a GET STATUS command.

To see this error:

a. Put the toggle switch in demo mode.

b. While in demo mode, press the output

control pushbutton.

c. Release the output control pushbutton.

d. Leave demo mode using the toggle switch

before OUT8 turns on.

e. Press the Get Status pushbutton. Multiple

attempts may be required to see this result.

Figure 13. Byte Field Framing Error

APPINFO

4. No Failure.

5. Global Thermal Shutdown*.

6. OUT4/OUT8 Overcurrent or Thermal Shutdown*.

a. Overcurrent setups are created with the

individual OCD (1−8) pushbuttons. Only

OUT4 and OUT8 are reported in the

APPINFO register by design.

b. Overcurrent is also reported in the output

status readout (Figure 14). This is a latched

off event. A successful turn-off command

must be sent before an output in an OCD

condition will turn back on.

*Thermal Shutdown events are not advised on this board due to the

potential damage.

Figure 14. Output Status and Error Reporting Decoding

Open Load

Open load conditions are reported in the status reporting

for OUT4 and OUT8. Jumpers labeled Load 1–Load 8 are

included on the board. Figure 14 shows how open load faults

are reported in the OUT STATUS READOUT. These are

reported in the output off state.

External LIN Communication

The NCV7748GEVB uses an NCV7321 LIN transceiver

for communication from the microprocessor to the LIN bus

pin of the NCV7748 device. Jumpers are include for the TxD

and RxD pins with and adjacent LIN connection pin

providing the user with flexibility for an external LIN based

master device.

Additionally an RJ11 connector provides an alternative

for a connection to the LIN bus with a connection to VBB,

and ground.

NCV7748GEVB

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SCHEMATIC

Figure 15. Evaluation Board Schematic (1 of 2)

NCV7748GEVB

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Figure 16. Evaluation Board Schematic (2 of 2)

NCV7748GEVB

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PCB

Figure 17. Printed Circuit Board

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