ST STEVAL-ILL059V1 Manuale utente

Introduction

The STEVAL-ILL059V1 is a high brightness LED array driver evaluation board with diagnostics based on the STAP16DPS05

low voltage 16-bit constant current LED sink driver for automotive applications.

The LED driver is configured and controlled through an 8-bit automotive grade STM8A microcontroller via SPI interface. The

A5974D automotive grade DC-DC converter provides the necessary voltage and power for all the board functions.

The package includes a GUI that helps you evaluate the features of the LED driver and download your own application firmware

onto the board through the SWIM interface.

Figure 1. STEVAL-ILL059V1 LED array driver evaluation board

High brightness LED array driver with diagnostics for automotive applications

based on STAP16DPS05 and STM8A

UM2554

User manual

UM2554 - Rev 1 - February 2019

For further information contact your local STMicroelectronics sales office.

www.st.com

1Overview

The package consists of the following elements:

•A STEVAL-ILL059V1 evaluation board

• An RS232-USB bridge daughterboard

• Dedicated GUI software

• User documentation

Figure 2. Block diagram of STEVAL-ILL059V1 evaluation board

The STEVAL-ILL059V1 evaluation board includes a DC input power supply, an 8-bit microcontroller and a SWIM

connector to program the microcontroller, 32 white LEDs and user interface buttons and potentiometers to control

the two STAP16DPS05 LED drivers (each driver controls 8 LEDs

The evaluation board can operate in the following modes:

1. Standalone Mode: the board is controlled via on-board push buttons and potentiometers

2. GUI Mode: is activated when the board is connected to a PC, and lets you control the board through the GUI

The package includes an RS232-USB daughterboard that supports full-duplex communication between USB and

UART interfaces, thus allowing communication with the PC GUI via USB. The daughterboard connected is

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Overview

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Figure 3. STEVAL-ILL059V1 evaluation board (top)

1. 6–24 V DC power supply with reverse voltage protection and short-circuit protection, standard DC jack input

2. A5974D automotive grade switching regulator for automotive applications

3. LF33: 3.3 Volt linear voltage regulator for automotive applications

4. STM8AF6266 8-bit microcontroller for automotive applications

5. Backwards and forwards button switches

6. Reset switch

7. SWIM connector to program and debug microcontroller firmware

8. Connector for LIN development and evaluation

9. Brightness control potentiometer

10. Speed control potentiometer

11. STAP16DPS05 constant current LED driver

12. 32 white LEDs (PLCC 4)

13. 8 jumpers, to simulate open-circuit error

14. 3 jumpers, to simulate short-circuit error

567

8910

12 14

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Overview

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Figure 4. STEVAL-ILL059V1 evaluation board (bottom)

15. Slot for USB to UART daughterboard

Figure 5. RS232-USB bridge daughterboard (top)

1. Mini-B type female USB connector

2. SWD connector (for programming daughter board)

3. Connector for UART communication between main board and daughter board

4. ESDAULC6-3BP6 ESD protection for high speed interfaces

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Overview

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Figure 6. RS232-USB bridge daughterboard (bottom)

5. STM32F103C8T7 32-bit microcontroller

6. 16 MHz crystal

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Overview

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1.1 Operating modes

1.1.1 Standalone Mode

In standalone Mode, the STEVAL-ILL059V1 evaluation board is not connected to a PC via the RS232-USB

interface board. In this mode, you can perform the following actions:

•run default LED demo patterns

• use two on-board buttons to scroll back and forth between the demo patterns

• use two on-board potentiometers to gradually change the brightness (average maximum LED current) and

speed of the patterns

• simulate error conditions and detection using open-circuit and short-circuit jumpers

• use the reset button to reset the microcontroller and return to the first demo pattern

Note: The board immediately starts with brief animation on the LED matrix when DC power is supplied. You can

control the board after the animation.

1.1.2 GUI Mode

To control the board using the GUI, use the USB to UART bridge as an interface between the evaluation board

and your PC. The bridge supports bi-directional communication.

The GUI allows the following control, programming and monitoring activities:

•Basic actions:

– all the actions in standalone, but controlled from the GUI

– switch individual LEDs on and off, and adjust their brightness

– switch all LEDs on and off at once

– adjust the brightness of all the LEDs at once

• Use the four preset programs to quickly view how frame programming works on the evaluation board

• Build your own programs to display any pattern of up to 20 frames, with the following settings:

– transition time between the frames

– frame count of the number of frames in your program

– brightness slider to configure the brightness of each frame

• Monitor error detection on the GUI at the following rates:

– once only

– every 0.5 seconds

– every 1 second

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2Sample firmware demos

2.1 LED demo patterns

Alphanumeric text in flashing mode demo

In the alphanumeric text in flashing mode demo, the letters “ST” flash in the LED matrix; the flashing rate is

adjustable, but the brightness potentiometer remains inactive in this mode.

Figure 7. Flashing text demo

Curtain pattern

Figure 8. All LEDs on during curtain pattern

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Random pattern

Figure 9. Random pattern 1

Figure 10. Random pattern 2

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LED demo patterns

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Figure 11. Random pattern 3

Figure 12. Random pattern 4

2.2 Error detection demonstration

In the error detection demo, the drivers perform open-error detection and short-error detection simultaneously. If a

defective LED is found, it is signaled by lighting the corresponding LED in the row below for an open circuit fault

and on the left for a short-circuit fault.

On the board, open and short-circuit errors are simulated using open and short jumpers, respectively. The

following table shows how each jumper provokes a specific fault, and how the fault is signaled on the LED array.

Table 1. Error detection jumper table

Jumper Required action Fault type Error in LED Shown on LED

J7 Place jumper Short D30 D26

J8 Place jumper Short D31 D27

J9 Place jumper Short D32 D28

J10 Remove jumper Open D1 D2

J11 Remove jumper Open D5 D6

J12 Remove jumper Open D9 D10

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Error detection demonstration

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Jumper Required action Fault type Error in LED Shown on LED

J13 Remove jumper Open D13 D14

J14 Remove jumper Open D17 D18

J15 Remove jumper Open D21 D22

J16 Remove jumper Open D25 D26

J17 Remove jumper Open D29 D30

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Error detection demonstration

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