STMicroelectronics STEVAL-ILL028V1 Manuale utente

July 2010 Doc ID 16881 Rev 2 1/20

UM0882

User manual

STEVAL-ILL028V1 LED dimmer board

using STP1612PW05 and STM32™

1 Introduction

This user manual describes STMicroelectronics™ STEVAL-ILL028V1 LED dimmer board.

This board is based on STP1612PW05 independent PWM LED driver controlled through

STM32 microcontroller SPI interface and DMA (optional).

This document explains how to use the board: hardware setup, demonstration firmware

functions, possible interconnections with PC and evaluation of STP1612PW05.

Figure 1. STEVAL-ILL028V1 LED dimmer board

www.st.com

www.BDTIC.com/ST

Contents UM0882

2/20 Doc ID 16881 Rev 2

Contents

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

2 Board function overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3 Hardware setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Microcontroller JTAG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.3 Microcontroller clock, reset, USB clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.4 Jumpers for LED failure simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Description of the demonstration firmware functions . . . . . . . . . . . . . . 7

4.1 Mode “A” - interactive demonstration - color Tetris . . . . . . . . . . . . . . . . . . . 8

4.2 Mode “B” - wave color demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.3 Mode “C” - solid color demonstration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

4.4 Mode “D” - error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5 PC demonstration firmware software . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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UM0882 List of tables

Doc ID 16881 Rev 2 3/20

List of tables

Table 1. Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 2. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

www.BDTIC.com/ST

List of figures UM0882

4/20 Doc ID 16881 Rev 2

List of figures

Figure 1. STEVAL-ILL028V1 LED dimmer board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Setup of the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 3. The menu; the letter “A” indicates the first item of the menu . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4. The control buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 5. Simulation of LED defect by setting/removing P21 to P2 jumpers . . . . . . . . . . . . . . . . . . . . 8

Figure 6. Software - Windows® application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 7. USB host (PC) detection in progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 8. USB host (PC) detected . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 9. USB host (PC) not found . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 10. Manual board connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 11. Board connected successfully . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 12. Error detection mode performed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 13. Connectors, buttons, UART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 14. Microcontroller, USB, power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 15. High brightness LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 16. LED drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

www.BDTIC.com/ST

UM0882 Board function overview

Doc ID 16881 Rev 2 5/20

2 Board function overview

The STEVAL-ILL028V1 demonstration board features:

●Three STP1612PW05 (QFN24 4 x 4 mm) connected to 16 RBG LEDs

●16 RGB high brightness LEDs

●One STM32 microcontroller using internal HS oscillator

●An ST1S10: a high-efficiency switching DC-DC power supply

●7.5 - 18 V DC power supply with undifferentiated polarity and overvoltage protection

●DC input current 0.7 A max., standard supply connector

●LED current regulation

●The board can be controlled by 3 buttons, a knob and a reset/back button

●Test point for each main signal

●Microcontroller firmware update through JTAG interface

●Error LED and overtemperature LED for each LED driver

●3 jumpers to disconnect the LEDs from the driver to test the error detection mode

●3 jumpers to enable LED shortage from the driver to test the error detection mode

●Mini USB to connect the board to a PC

The board is delivered with a firmware allowing to evaluate the board features in standalone

and nonstandalone mode:

●LED diagnostic

●Adjustable brightness of each LED

●Adjustable color of each LED

●Animated text

●GUI software for LED diagnostic (see Figure 6).

www.BDTIC.com/ST

Hardware setup UM0882

6/20 Doc ID 16881 Rev 2

3 Hardware setup

The main board components are shown on Figure 2.

Figure 2. Setup of the board

3.1 Power supply

The board is powered by a 7.5 to 18 V DC voltage. The power source must be able to deliver

a 0.7 A current. Since the board has a built-in diode bridge, the polarity of the input voltage

is not specified.

3.2 Microcontroller JTAG

The board is equipped with a standard 20-pin JTAG connector allowing to debug and

develop the STM32 microcontroller.

3.3 Microcontroller clock, reset, USB clock

The STM32 on-board microcontroller uses its internal RC oscillator to generate an 8 MHz

clock (that is converted to 48 MHz by a PLL). The clock is also used to drive USB. Since the

internal RC oscillator does not allow to achieve the clock stability defined in USB

specifications, it is recommended not to use the internal RC oscillator in conjunction with the

USB interface. The USB is used only for demonstration purpose, but the performance is

limited due to this internal RC oscillator stability.

3.4 Jumpers for LED failure simulation

LED defects can be simulated by using P20, P21 and P22 jumpers:

●Removing a jumper on P20, P21 and P22 causes D1, D2 and D3 green LED open-

circuit

●Placing a jumper on P1, P2, and P3 causes D6, D9 and D12 blue LED short-circuit.

These simulated defects can be detected during the activation of the error detection

mode (see Section 4). The defective LED is highlighted by switching on the

corresponding red LED.

www.BDTIC.com/ST

UM0882 Description of the demonstration firmware functions

Doc ID 16881 Rev 2 7/20

4 Description of the demonstration firmware functions

The main features of the firmware are:

●Brightness control for each LED

●Color control for each LED

●Error detection to detect LED failure

●Simulation Tetris game.

The RGB LEDs are switched on to display letter 'A', 'B', 'C' or 'D'. Each letter represents

a menu option (or mode).

The firmware mode menu items:

●Mode “A” interactive demonstration - color Tetris

●Mode “B” wave color demonstration

●Mode “C” solid color demonstration

●Mode “D” error detection demonstration.

After power-up, the letter 'A' is displayed blinking. An action on a button or on the knob

allows to select the required mode and display another letter.

Figure 3. The menu; the letter “A” indicates the first item of the menu

The board can be controlled by four buttons and one knob, Figure 4:

●Button back/reset - exit from current task in to the main menu

●Button left - turn the mode menu decrementally

●Button center - enter the choosen mode in menu

●Button right - turn the mode menu incrementally

●Knob - changes the color of the menu from blue to red.

Figure 4. The control buttons

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Description of the demonstration firmware functions UM0882

8/20 Doc ID 16881 Rev 2

4.1 Mode “A” - interactive demonstration - color Tetris

Mode 'A' performs a simple interactive demonstration similar to Tetris game. The game

starts with a green brick moving from the bottom to the top of the LED area. The brick

position can be controlled by using the right and left buttons. Once the brick reaches the top

of the LED area of another already settled brick, it stops and turns to blue. A blue brick

cannot be moved. When a row is full of blue bricks, it disappears and the player scores

points. The game ends as soon as the blue bricks reach the bottom of the LED area. When

the game is over, the score is displayed. Pressing the center button starts a new game. The

knob changes the light brightness of the LEDs.

4.2 Mode “B” - wave color demonstration

Mode “B” shows different color effects. The effect can also be changed manually by using

the center button. The knob changes the speed of the effect.

4.3 Mode “C” - solid color demonstration

Mode “C” allows to display a given color on the LEDs. Pressing the right button changes the

colors in this order (left button in reverse order): red, green, blue, yellow (red + green), cyan

(green + blue), magenta (red + blue), white (red + green + blue) and black (all LEDs are off).

The knob changes the light brightness of the LEDs.

4.4 Mode “D” - error detection

Mode 'D' performs LED error detection, and displays the error. Error detection is performed

by LED drivers every 2 seconds. If a defective LED is found, it is signalled by switching on

the corresponding red LED. D1, D2 and D3 green LED open-circuit defect can be simulated

by removing P20, P21, or P22 jumper. D6, D9 and D12 blue LED short-circuit defect can be

simulated by closing P1, P2, or P3 jumper.

Figure 5. Simulation of LED defect by setting/removing P21 to P2 jumpers

www.BDTIC.com/ST

UM0882 PC demonstration firmware software

Doc ID 16881 Rev 2 9/20

5 PC demonstration firmware software

PC demonstration software supplied with the board can work together with the board

firmware using USB interface. The software can detect the board, drive it by mouse instead

of the on-board buttons, trigger and visualize the result of the error detection.

Figure 6. Software - Windows®application

The following steps are required to run the PC demonstration software correctly:

1. Disconnect the power supply from the board.

2. Connect the board to the computer through the USB cable.

3. Connect the board to the power supply.

4. If Windows asks for the installation of an appropriate driver, use STMicroelectronics

VirtualCOMPort.

www.BDTIC.com/ST

PC demonstration firmware software UM0882

10/20 Doc ID 16881 Rev 2

Figure 7. USB host (PC) detection in progress

Figure 8. USB host (PC) detected

Figure 9. USB host (PC) not found

5. Run SWforDimmer.exe.

6. If the board is not detected automatically, click “Find board on COM port” on the menu

as shown in Figure 10.

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