STMicroelectronics STEVAL-ILL029V1 User manual

September 2010 Doc ID 17476 Rev 1 1/22

UM0943

User manual

STEVAL-ILL029V1 front panel demonstration board

based on the STLED325

Introduction

This user manual explains the operation of a front panel demonstration board based on the

advanced LED controller driver STLED325 and the STM8S207K6 8-bit microcontroller as

the I2C master. The objective of this demonstration board is to show the features of the LED

controller driver STLED325, such as key scanning, RTC, IR decoding, standby

management, etc., for the market segment of DVD players, DVD recorders, set-top boxes,

washing machines and more, while keeping system costs as low as possible.

The system can be operated using the various front panel keys provided, as well as by

remote control. System I/O is handled completely by the STLED325 with minimal load on

the host processor.

Figure 1. STLED325 front panel demo

The salient features of the system are:

■4-digit, 7-segment (and decimal point) LED display

■8 discrete LEDs

■8 front panel keys for channel and brightness up/down, ok, menu, and standby

■A bicolor power/standby LED

■An interrupt LED (blinks with the interrupt)

■A potentiometer for adjusting display brightness

■Demonstration mode

■Multi format remote control operation (only RC5 currently supported, but easily

extendable for various other formats.

■Embedded in-circuit programming using a SWIM interface for the STM8S207K6

Refer to datasheet STM8S207K6; Performance line, 24 MHz. 8-bit MCU, up to 128 Kbytes

Flash, integrated EEPROM,10-bit ADC, timers, 2 UARTs, SPI, I²C, CAN.

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Contents UM0943

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Contents

1 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1 Power supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 7-segment (+decimal point) and discrete LED display . . . . . . . . . . . . . . . . 6

1.3 Front panel keys/wake-up key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.4 DIP switch/external interface connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.5 IR sensor connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Interrupt LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 Package contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.2 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Powering on the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Startup display sequence/default setting of the system . . . . . . . . . . . . . . . 8

3 System features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.1 Brightness adjustment through potentiometer . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Channel number/brightness level display mode . . . . . . . . . . . . . . . . . . . . . 9

3.3 RTC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3.1 Display time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3.2 Display date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3.3 Set time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.3.4 Set date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3.5 Set alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.3.6 Alarm condition display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.4 Demonstration mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.5 Remote control operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 Standby mode/hot keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Appendix A STEVAL-ILL029V1 schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Appendix B Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

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UM0943 List of figures

Doc ID 17476 Rev 1 3/22

List of figures

Figure 1. STLED325 front panel demo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. Demonstration board front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3. Demonstration board rear view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 4. DC power jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Figure 5. 7-segment LED display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 6. Discrete LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 7. External interface connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 8. Example RC5 remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 9. Entering into standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 10. System is in standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 11. Microcontroller section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 12. Power supply section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 13. Discrete LED and seven segment LED section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 14. STLED325 section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Figure 15. Keyscan circuit section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 16. Connectors section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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Hardware description UM0943

4/22 Doc ID 17476 Rev 1

1 Hardware description

Figure 2. Demonstration board front view

Figure 3. Demonstration board rear view

Major components present on the board are (the numbers in parentheses refer to the

numbers marked on the board images):

●8 front panel keys (1): CH+, CH-, BRGHT+, BRGHT-, STBY, MENU, OK, DEMO

●BRGHT_ADJ potentiometer (2)

●PWR/STBY LED (3)

●Interrupt LED (4)

●MUTE LED (5)

●External host interface connector (6)

●DIP switch (7)

●SWIM connector (8)

●IR sensor circular header (9)

●STM8S207K6 microcontroller (10)

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UM0943 Hardware description

Doc ID 17476 Rev 1 5/22

●7-segment (+dot) display (11)

●STLED325 (12)

●32.768 kHz RTC crystal (13)

●8 discrete LEDs for brightness (14)

●UART pinouts (15)

●Wake-up key: WAKE UP (16)

●DC buzzer for alarm function (17)

●Super cap for backup (18) (battery backup can be replaced by a lithium ion battery for

longer backup time)

●System reset switch (19)

●DC power jack (20)

1.1 Power supply unit

The board is equipped with a DC jack into which an external adaptor (9 V-18 V, 500 mA) can

be plugged. The board consists of a 5 V output switching regulator for higher efficiency and

a 3.3 V output linear regulator onboard to give regulated outputs, as required. The board

may also be powered up using a PC laptop adaptor. The user must ensure that the external

PSU jack is of the center positive type, although reverse polarity does not damage the

demonstration board. A bicolor “PWR/STBY” LED (D4) is shown in Figure 2. When in

normal operation the PWR/STBY LED is green and turns red when the system is in standby

condition.

Figure 4. DC power jack

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Hardware description UM0943

6/22 Doc ID 17476 Rev 1

1.2 7-segment (+decimal point) and discrete LED display

The board consists of 4 7-segment (+decimal point) display modules driven by the

STLED325. By default, the two digits on the left display the channel information and the two

digits on the right display the brightness level information.

Figure 5. 7-segment LED display

Figure 6. Discrete LEDs

1.3 Front panel keys/wake-up key

The board is provided with 8 front panel keys: CH+, CH-, BRGHT+, BRGHT-, OK, MENU,

DEMO and STBY. There is one pin designated as WAKE-UP to wake-up the system from

STANDBY.

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UM0943 Hardware description

Doc ID 17476 Rev 1 7/22

1.4 DIP switch/external interface connector

The board consists of an 8-position DIP switch (SW2). All the switches should be in the ON

position (towards circle/ON side) for the demo to work. When the device STLED325 is

required to be isolated from the onboard STM8S207K6 host and controlled through an

external I2C host, all the switches should be moved to the OFF position. Then, the

STLED325 control pins can be accessed through the external interface connector (J3). A

detailed description of the external interface connector is provided on the bottom silkscreen

of the board and also listed below for reference.

Figure 7. External interface connector

1.5 IR sensor connector

A 38 kHz IR sensor is mounted at J4 for IR control and supports RC5 protocol.

1.6 Interrupt LED

There is a blue interrupt LED (D21 : INTR) which blinks whenever an interrupt is asserted

from the device which may be due to a front panel key press, remote control key press, RTC

alarm, wake-up from standby, etc.

www.BDTIC.com/ST

Getting started UM0943

8/22 Doc ID 17476 Rev 1

2 Getting started

2.1 Package contents

The STLED325 front panel demonstration board package includes:

●Demonstration board (STEVAL-ILL029V1)

●User manual (UM0943)

●Schematic

●Gerber files

2.2 System requirements

The system operates in standalone mode by powering externally through an external

adaptor (9 V-18 V, 500 mA). The board can also be powered up using a laptop adaptor.

2.3 Powering on the system

As soon as the DC power supply is plugged in, the system is up and running. The

PWR/STBY LED (D4) is green with the MUTE LED (D3) turned off.

2.4 Startup display sequence/default setting of the system

On startup the system displays a rotating text welcome message “STLED325” on the 7-

segment display. Then, “c h b r” is displayed for about 2 seconds, after which the system

displays the channel number and brightness level information. When the board is powered

on for the first time, the following default settings are programmed:

●Channel number: 00

●Brightness information: 01 (01/16)

Subsequently, every time the board is powered on, it retains the last configured data and

displays the same on startup. The STM8S207K6 internal EEPROM is used to store the user

data (channel number and brightness information), and this feature is not available if an

external host is used.

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UM0943 System features

Doc ID 17476 Rev 1 9/22

3 System features

3.1 Brightness adjustment through potentiometer

The system is also provided with a potentiometer “BRGHT_ADJ” (R5) which can be used to

vary the brightness of the LEDs by setting the output current. The brightness increases

when the potentiometer is rotated clockwise and decreases with an anti-clockwise rotation.

3.2 Channel number/brightness level display mode

In this mode the system displays the channel number (on the far left, two 7-segment display

modules) and brightness level (on the far right, two displays). Channel number and

brightness can be increased/decreased using the front panel keys provided on the board

(CH+, CH-, BRGHT+, BRGHT-). Similar operations can be performed using remote control

keys, as explained in Section 3.5.

The maximum and minimum limits for channel numbers are 99 and 00, while the maximum

and minimum values for brightness level are 16 and 1 (16/16, 1/16).

The brightness level is also shown by the number of discrete LEDs lit up. (1 LED each for 2

levels).

3.3 RTC operation

The STLED325 also features a built-in RTC. The MENU key on the front panel is provided to

select RTC set/view options. Various front panel keys can be used to operate the real time

clock.

Press MENU to enter into and navigate through menu options. Press MENU once - “RTC” is

displayed. Now press OK to enter into RTC options. Now using the MENU key the user can

navigate through “TIME” (view time), “DATE” (view date), “SETT” (set time), “SETD” (set

date), and “SETA” (set alarm).

3.3.1 Display time

Press MENU to go to “RTC” and then OK. “TIME” is displayed and press OK again to go to

view time. “HH.MM” is displayed for a second to signify the time display in hours-minutes

format, followed by current RTC time display with hours and minutes separated by a “.”.

Press OK again to exit to the channel-brightness display.

3.3.2 Display date

Press MENU and then OK. Use the MENU key again to reach “DATE” and press the OK key.

“DD.MM” is displayed for a second to signify date display in date-month format after which

the current RTC date is displayed. Date and month data are separated by a “.”. Press OK

again to exit to the channel-brightness display.

3.3.3 Set time

Press MENU and then OK. Use MENU key to go to “SETT” and press OK. The system

prompts the user to enter time in “Hours-Minutes” format. Use the front panel keys BRGHT+

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System features UM0943

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and BRGHT- to increase and decrease the value and CH- and CH+ to move left/right. The

seconds field is taken as 0.

After adjusting the time, press OK. The time is set and the system returns to channel-

brightness display.

3.3.4 Set date

Press MENU and then OK. Press MENU again multiple times to go to “SETD”. Now press

OK. The system prompts to enter date in “Date-Month” format. Use front panel keys Bright+

and Bright- to increase and decrease the value and CH- and CH+ to move left and right.

After adjusting the date press OK again. Now the system prompts to enter year (two digits

“e.g. 10 for 2010” and week day (1- Monday, 2 - Tuesday, etc.). After entering the

information, press OK. The date is set and the system returns to channel-brightness display.

3.3.5 Set alarm

Press MENU and then OK. Press MENU again multiple times to go to “SETA”. Now press

OK. The system shows the current RTC time and prompts the user to enter Alarm time in

“Hours-Minutes” format. Use front panel keys Bright+ and Bright- to increase and decrease

the value and CH- and CH+ to move left/right. The seconds' field is taken as 0 and current

RTC date as alarm date automatically. After adjusting the value, press OK again. The alarm

is set and the system returns to channel-brightness display.

3.3.6 Alarm condition display

When the alarm alert is received from the STLED325 internal RTC, “-AL-” is displayed along

with the buzzer sound (tick-tick sound: This buzzer is driven by GPIO1 of the STLED325). In

case the system was in display RTC mode (display RTC time/ RTC date) when the alarm

condition is met, the system display remains at its previous display state (display RTC)

during the alarm while the buzzer still sounds. The alarm goes off when any interrupt is

received (FP key press/RC key press) and the system returns to channel-brightness display.

3.4 Demonstration mode

The system enters into demonstration mode by pressing the demo key on the front panel. In

this mode scrolling text with varying brightness and increasing scrolling speed is displayed

continuously.

Text displayed: “STLED325 front panel demo” followed by blinking of 325 two times (left

aligned and right aligned).

The system comes out of demo mode and returns to its “channel-brightness” display mode

when either of the front panel or RC keys is pressed or the RTC alarm condition is met.

3.5 Remote control operation

The system currently supports only RC5 protocol; however, it can be easily adapted to

implement other RC protocols. The MENU options support changing the currently used RC

protocol but is not currently implemented in the system. For more details, refer to the data

brief STLED325; Front panel demonstration board based on the STLED325 and STM8S.

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