NEC EV-K0-HCD Instrucciones de uso

Hardware User’s Manual

EV-K0-HCD Evaluation Kit

©May 2008. NEC Electronics America, Inc.

Document no. 51069

EV-K0-HCD Evaluation Kit User’s Manual

Contents

1. Introduction ....................................................................................................................................1

1.1 Contents.........................................................................................................................................................1

1.2 Features.........................................................................................................................................................1

2. Hardware..........................................................................................................................................3

2.1 Power Supply...............................................................................................................................................4

2.2 LED Drivers...................................................................................................................................................4

2.3 On-board LUXEON Rebel LEDs............................................................................................................4

2.4 Future Lighting Solutions LED Board...................................................................................................5

2.5 LED Light Engine Connectors.................................................................................................................5

2.6 RS-485/DMX-512 Interface .....................................................................................................................6

2.7 RS-232 Interface.........................................................................................................................................7

2.8 Expansion IO Connector...........................................................................................................................7

2.9 USB Programming and Debugging Interface.....................................................................................7

2.10 Temperature Sensor.................................................................................................................................. 7

2.11 Ambient Light Sensor ................................................................................................................................8

2.12 DIP Switch.....................................................................................................................................................8

2.13 Reset Switch................................................................................................................................................. 8

3. Software ...........................................................................................................................................9

Appendix A. Schematics........................................................................................................... 10

Appendix B. Bill of Materials..................................................................................................... 12

Appendix C. Board Assembly .................................................................................................. 14

Appendix D. Board Layout........................................................................................................ 15

EV-K0-HCD Evaluation Kit User’s Manual

1. INTRODUCTION

The EV-K0-HCD evaluation kit for NEC Electronics’ highly integrated, general-purpose µPD78F8024

microcontroller (MCU) with high-current drive allows you to demonstrate the MCU’s capabilities and

easily develop intelligent code for emerging high-power LED lighting applications. Compact yet flexible

and functionally versatile, the board can be used to drive four channels of single or multiple high-power

LEDs in any of three different configurations:

•With the on-board LUXEON®Rebel™LEDs

•Using LED boards from Future Lighting Solutions

•Using off-the-shelf LED lighting engines such as the Dialight linear engine

The board also can be used to control and dim individual LED channels by means of analog and digital

sensor inputs, such as temperature, light and color. Various serial communication protocols are

supported by this board, including I

C, SPI, RS-232, and RS-485/DMX-512. Users can program,

change, and debug code easily and free of charge using the on-board USB programming and

debugging interface (available June 2008).

1.1 Contents

•EV-K0-HCD board

•12 V

power supply

•USB cable

•DB9 cable

•One set of plastic stands and screws

•CD-ROM with Applilet EZ software and an evaluation copy of the CA78K0 compiler/

assembler with 32 KB code size limit

1.2 Features

•NEC Electronics µPD78F8024 high-current-drive (HCD)/LED MCU

•NEC Electronics µPA2756 dual N-channel MOSFETs

•Four channels of constant high-current LED drivers

⎯Buck topology

⎯Up to 700 mA per channel

⎯Supply voltage from 10 to 24 V

•On-board LUXEON Rebel LEDs (red/green/blue/white)

•Four Future Lighting Solutions LED board connectors

•Four LED light engine connectors

•USB programming and debugging interface

•RS-232 interface

•RS-485/DMX-512 interface

EV-K0-HCD Evaluation Kit User’s Manual

•Expansion IO connector

•On-board temperature sensor

•On-board ambient light sensor

•DIP switch for board configurations

•Reset switch for uPD78F8024 device reset

EV-K0-HCD Evaluation Kit User’s Manual

2. HARDWARE

The EV-K0-HCD board measures 3.15 × 3.15 inches or 80 × 80 millimeters (mm). This small form

factor is enabled by the use of components such as inductors that are small in size thanks to the

µPD78F8024 MCU’s constant-current drives with high switching frequency.

The board is designed with four layers. The top layer contains most of the components, the first middle

layer serves as the power plane, the second middle layer adds additional space for traces, and the

bottom layer serves as the ground plane and assembly for the temperature sensor and high-power

LEDs.

The heat generated by the LEDs is dissipated through the pads and vias surrounding the LEDs, and

LED temperature is sensed by the temperature sensor mounted on top of the dissipation pad.

Figure 1. EV-K0-HCD Board (Top View)

Figure 2. EV-K0-HCD Board (Bottom View)

EV-K0-HCD Evaluation Kit User’s Manual

2.1 Power Supply

The EV-K0-HCD board requires a 10 to 24 V

power supply with output wattage of at least 5 watts

(W) to light the high-power LEDs. The barrel-type power jack mounted on the board accepts a 2.1 mm

center pole connector (center positive).

2.2 LED Drivers

The board’s four-channel LED drivers are set in buck topology for 350 milliamps (mA) of constant

output current. However, you can increase output current up to 700 mA by changing the current

sensor’s resistor values using the following formula (refer to R1, R2, R3 and R4 in the schematics).

Please note that you need to change the inductors (refer to L1, L2, L3 and L4 in the schematics)

current rating accordingly if you wish to drive at more than 350mA.

= 0.115 / I

LED

(Formula 1)

Where R

= current sensor’s resistor value and I

LED

= LED current. When driving the LEDs at 350 mA,

the current sensor’s resistor value should be set to 0.33 ohm (Ω).

The number of LEDs that can be used in series per channel is determined by the supply voltage and

the LED forward voltage using this formula:

MAX

≤V

/ V

(Formula 2)

Where V

= supply voltage, V

= LED forward voltage current, and N

MAX

= maximum number of LEDs

in series per channel.

Generally, the sum of LED forward voltages must be less than the supply voltage for buck mode

operation. For a 24V power supply, for example, a maximum of six LEDs with 3.5V forward voltage

may be used in series per channel.

LED driver outputs can be connected in one of three configurations:

•To the on-board

LUXEON Rebel

high-power LEDs

•To LED boards with LUXEON

K2 high-power LEDs from Future Lighting Solutions

•To LED light engines

2.3 On-board

LUXEON Rebel

LEDs

There are four LUXEON Rebel high-power LEDs mounted on the back of the EV-K0-HCD board, one

red (R), one green (G), one blue (B) and one white (W). By default, the board is set to drive the LEDs

EV-K0-HCD Evaluation Kit User’s Manual

with jumper wires inserted into the four Tyco six-position receptacle connectors (refer to J1, J2, J3 and

J4 in the schematics).

Figure 1. Driving the On-board LEDs

2.4 Future Lighting Solutions LED Board

The EV-K0-HCD board can connect and drive LED boards from Future Lighting Solutions. To do so,

you must first remove the jumper wires inserted into the four Tyco receptacle connectors (J1, J2, J3

and J4) before installing the LED boards. You can then cascade multiple LED boards in one channel

as long as the number of LEDs meets the requirement specified by Formula 2.

Figure 2. Driving Future Lighting Solutions LED Boards

2.5 LED Light Engine Connector

The EV-K0-HCD board has four LED light engine connectors (refer to J5, J6, J7 and J8 in the

schematics) to the 4-pin terminal block. The following table describes the function of each pin.

Table 1

Light Engine Connectors

LED

Pin Number 1 2 3 4

Function Analog input Ground LED anode LED cathode

EV-K0-HCD Evaluation Kit User’s Manual

They can be used to drive up to four off-the-shelf LED light engines, for example, the POWERWHITE™

linear light engine modules from Dialight. Before installing the modules, you must first remove the

jumper wires inserted at the four Tyco receptacle connectors (J1, J2, J3 and J4).

There are six LUXEON Rebel high-power LEDs in series in one POWERWHITE light engine module.

Therefore the power supply must be 24 V

to meet the requirement specified by Formula 2.

The analog inputs (pin 1 & 2) on the connectors are mainly for connecting to off-board thermister on

the light engine module but can be used for any analog inputs, such as potentiometer, light sensors,

etc. Please not that each analog input is biased with a 10kohm resistor (refer to R11, R12, R13 and

R14).

Figure 3. Driving the Dialight Light Engines

2.6 RS-485/DMX-512 Interface

The EV-K0-HCD board supports DMX-512 protocol over RS-485 using the MCU’s UART0 port. The

RS-485/DMX-512 connector is a 3-pin terminal block connector that accepts up to 24 American Wire

Gauge (AWG) wires.

Table 2

485/DMX-512 Connectors

RS-

Pin Number 1 2 3

Function Ground D- D+

The µPD78F8024 MCU’s UART0 port is shared between the RS-485 and RS-232 connectors through

a Maxim level shifter (refer to U7 in the schematics). By default, the RS-485 connector is enabled and

the RS-232 one is disabled.

If required, an on-board 110Ωresistor can be inserted between D+ and D- of the RS-485/DMX-512

port as a terminating resistor. By default, the resistor is disconnected. To connect it, insert a jumper

into the JMP1 header (refer to JMP1 in the schematics).

EV-K0-HCD Evaluation Kit User’s Manual

2.7 RS-232 Interface

A DB9 male connector is used for the RS-232 interface. By default, RS-232 function is disabled. To

enable it, place DIP switch (refer to SW1 in the schematics) position 4 in the “ON” position.

Table 3

232 Connector

RS-

Pin Number(s) 2 3 5 1, 4, 6, 7, 8, 9

Function TX RX Ground Not Connected

2.8 Expansion IO Connector

A dual-row 10-pin header footprint in 2mm-pitch is available on the EV-K0-HCD board (refer to CN3 in

the schematics), the uPD78F8024 device’s UART0/CSI and I2C signals are pulled out on this

connector. The following table shows the pin out connections.

Table 4. Expansion IO Connector

Pin Number Pin Name Description

1 GND Ground

2 VDD Logic power supply

3 RX/SI UART0 RX signal / CSI data input signal

4 TX/SCK UART0 TX signal / CSI clock signal

5 SO CSI data output signal

6 IO P0.0 / Timer TM00 capture input

7 SCL I2C clock signal

8 SDA I2C data signal

9 GND Ground

10 VDD Analog voltage reference

The expansion IO connector pin outs are compatible with the NEC Electronics ZigBee sticks interface,

users can add ZigBee / 802.15.4 wireless capability to LED lighting applications.

2.9 USB Programming and Debugging Interface

The EV-K0-HCD evaluation board implements an on-board USB programming and debugging

interface using the NEC Electronics µPD78F0730 USB MCU. You can download code to the

µPD78F8024 HCD/LED MCU from a host computer via a mini-USB cable, and then proceed to debug

that code (the debug software will be available by June 2008).

2.10 Temperature Sensor

The EV-K0-HCD board populates a negative temperature coefficient (NTC) 10 kΩthermistor to sense

the temperature of the on-board LEDs. By default, the thermistor is disconnected from the

µPD78F8024 MCU’s A/D converter input. To connect to it, place DIP switch position 5 in the “ON”

position.

EV-K0-HCD Evaluation Kit User’s Manual

2.11 Ambient Light Sensor

The EV-K0-HCD board also populates a miniature surface-mount light sensor, part number APDS-

9005 from Avago Technologies, to sense the intensity of ambient light. By default, this sensor is

disconnected from the µPD78F8024 MCU’s A/D converter input. To connect to it, place DIP switch

(SW1) position 6 in the “ON” position.

2.12 DIP Switch

The EV-K0-HCD board uses a 6-position DIP switch (SW1) for configuration purposes. The following

table shows the various configuration options.

Table 5

rd Configuration Options

Boa

Setting

Switch No. OFF ON

SW1-1 USB programming mode Normal operation

SW1-2 Don't Care Self-flash programming mode

SW1-3 User-defined User-defined

SW1-4 RS-485 enabled / RS-232 disabled RS-232 enabled / RS-485 disabled

SW1-5 Temperature sensor disabled Temperature sensor enabled

SW1-6 Ambient light sensor disabled Ambient light sensor enabled

2.13 Reset Switch

The on-board reset switch (refer to SW2 in the schematics) can be used to reset the

µPD78F8024 MCU.

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