UM1058
User manual
STEVAL-ILL029V2/STEVAL-CBP007V1: front panel demo with
STLED325 and STMPE24M31 based touch panel
Introduction
This document explains the operation of the front panel demonstration board based on the
advanced LED controller driver STLED325 and 8-bit microcontroller STM8S as I2C master.
This system can be operated along with the STMPE24M31-based touch panel or the
mechanical keys. The objective of this board is to demonstrate the features of the
STLED325 LED controller driver, such as key scanning, RTC, IR decoding, standby
management, etc., as well as features of the advanced S-Touch device STMPE24M31 to fit
the market segment of DVD players, DVD recorders, set-top boxes, washing machines, etc.,
keeping the system cost as low as possible.
The system can be operated using the various touchkeys or mechanical front panel keys
provided on the system, as well as by remote control. System I/O is handled completely by
STLED325 and STMPE24M31 with minimal load on the host processor. The system can be
operated in two modes: touch interface mode or standalone mode (with mechanical keys on
STEVAL-ILL029V2). On power-up, the system automatically detects the presence of the
touch interface daughter card (STEVAL-CBP007V1) and goes into touch interface mode. If
there is no touch card plugged in, the system enters standalone mode and can be operated
using mechanical keys.
Figure 1.
May 2011
STLED325 front panel demo with STMPE24M31 touch interface
Doc ID 010039 Rev 1
1/34
www.st.com
Contents
UM1058
Contents
1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
4
5
2/34
2.1
Power supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
7-segment (+decimal point) and discrete LED display . . . . . . . . . . . . . . . . 9
2.3
Front panel keys / wake-up mechanical keys . . . . . . . . . . . . . . . . . . . . . . . 9
2.4
DIP switch / external interface connector . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5
IR sensor connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.6
Interrupt LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.7
Interface connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.8
Touch pads / 8-channel touch status type rotator . . . . . . . . . . . . . . . . . . . 10
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1
Package content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2
System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3
Powering on the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4
Startup display sequence / default setting of the system . . . . . . . . . . . . . 11
System features (touch board connected) . . . . . . . . . . . . . . . . . . . . . . 12
4.1
Channel number - brightness level display mode . . . . . . . . . . . . . . . . . . . 12
4.2
RTC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1
Display time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2
Display date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.3
Set time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.4
Set date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.5
Set alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2.6
Alarm condition display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3
Demo mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4
Remote control operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5
Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
System features (touch interface not connected) . . . . . . . . . . . . . . . . 17
Doc ID 010039 Rev 1
UM1058
6
7
8
Contents
5.1
Brightness adjustment through potentiometer . . . . . . . . . . . . . . . . . . . . . 17
5.2
Channel number - brightness level display mode . . . . . . . . . . . . . . . . . . . 17
5.3
RTC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.1
Display time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.2
Display date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.3
Set time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.4
Set date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.5
Set alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3.6
Alarm condition display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4
Demo mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5
Remote control operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.6
Standby mode / hot keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1
STEVAL-ILL029V2 schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.2
STEVAL-CBP007V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1
BOM STEVAL-ILL029V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.2
BOM STEVAL-CBP007V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Doc ID 010039 Rev 1
3/34
List of figures
UM1058
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
4/34
STLED325 front panel demo with STMPE24M31 touch interface . . . . . . . . . . . . . . . . . . . . 1
STEVAL-ILL029V2 demonstration board front view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEVAL-ILL029V2 demonstration board rear view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEVAL-CBP007V1 front view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEVAL-CBP007V1 rear view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
STLED325 board with STEVAL-CBP007V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
DC power jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7-segment LED display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Discrete LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
External interface connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Alarm display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Example RC5 remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Entering into standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System is in standby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STLED325 section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Microcontroller section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Keyscan circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power supply section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Discrete LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Seven segment LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STMPE24M31 section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
LED section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Touchkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Touchkeys for rotator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Doc ID 010039 Rev 1
UM1058
1
Features
Features
The salient features of the system are:
●
4-digit, 7-segment (and decimal point) LED display
●
8 x discrete LEDs
●
8 front panel touchkeys for channel and brightness up/down, OK, menu, and
standby (in touch interface mode)
●
8-channel touch status type rotator on STEVAL-CBP007V1 for brightness control
(clockwise/anticlockwise) (in touch interface mode)
●
8 front panel mechanical keys for channel and brightness up/down, OK, menu, and
standby (in standalone mode with no touch interface)
●
A bicolor power/standby LED
●
An interrupt LED (blinks with the interrupt)
●
A potentiometer for adjusting the brightness of the display (accessible in standalone
mode)
●
Demo mode
●
Multi format remote control operation (only RC5 supported currently, but easily
extendable for various other formats. Refer to the STLED325 datasheet)
●
Embedded in-circuit programming using SWIM interface for STM8S
The complete functionality and operation of the demonstration board is explained in the
sections below.
Doc ID 010039 Rev 1
5/34
Hardware description
UM1058
2
Hardware description
Figure 2.
STEVAL-ILL029V2 demonstration board front view
Figure 3.
STEVAL-ILL029V2 demonstration board rear view
Figure 4.
6/34
STEVAL-CBP007V1 front view
Doc ID 010039 Rev 1
UM1058
Hardware description
Figure 5.
STEVAL-CBP007V1 rear view
Figure 6.
STLED325 board with STEVAL-CBP007V1
Major components present on STEVAL-ILL029V2 board are (refer to Figure 2 and 3):
●
8 front panel keys (1): CH+, CH-, BRGHT+, BRGHT-, STBY, MENU, OK, DEMO
●
8 front panel keys (5): CH+, CH-, BRGHT+, BRGHT-, STBY, MENU, OK, DEMO
●
BRGHT_ADJ potentiometer (9)
●
PWR/STBY LED (7)
●
Interrupt LED (16)
●
MUTE LED (8)
●
External Host Interface connector (13)
●
DIP switch(12)
●
SWIM connector (14)
●
IR sensor (17)
●
STM8S207K6T6 microcontroller(2)
●
7-segment (+dot) display (3)
●
STLED325(1)
●
32.768 kHz RTC crystal(15)
●
8 discrete LEDs for brightness(4)
Doc ID 010039 Rev 1
7/34
Hardware description
UM1058
●
Wake-up key (6)
●
DC buzzer for alarm function(19)
●
Super cap for backup (21) (battery can also be used as an alternative to super cap)
●
System reset switch (20)
●
DC power jack (18)
Major components present on STEVAL-CBP007V2 are (refer Figure 4 and 5):
2.1
●
STMPE24M31QTR (3)
●
Connectors to interface STEVAL-CBP007V1 with STEVAL-ILL029V2 (4, 5)
●
8 touchkeys for individual functions, 8-channel rotator for brightness control (1,2)
Power supply unit
The board is equipped with a DC jack, shown in Figure 7, 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), shown in
Figure 2, signifies the presence of supply on the board. When in normal operation the
PWR/STBY LED is green and turns red when the system is in standby condition.
Figure 7.
8/34
DC power jack
Doc ID 010039 Rev 1
UM1058
2.2
Hardware description
7-segment (+decimal point) and discrete LED display
The board consists of 4 7-segment (+decimal point) display modules driven by STLED325.
By default, the left two digits display the channel information while the right two display the
brightness level information.
2.3
Figure 8.
7-segment LED display
Figure 9.
Discrete LEDs
Front panel keys / wake-up mechanical keys
STEVAL-ILL029V2 is provided with 8 front panel keys: CH+, CH-, BRGHT+, BRGHT-, OK,
MENU, DEMO and STBY. There is one wake-up designated as WAKE-UP to wake up the
system from standby.
Doc ID 010039 Rev 1
9/34
Hardware description
2.4
UM1058
DIP switch / external interface connector
STEVAL-ILL029V2 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 STM8S host and controlled through an external
I2C host, all the switches should be moved to the OFF position. Then, STLED325 control
pins can be accessed through an 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 10. External interface connector
*
)#?3$!
34"9
)21?.
-?).4
6
'.$
)#?3#,
2%!$9
).42?,%$
-2%3%4
6
'.$
!-V
2.5
IR sensor connector
A 38 kHz IR sensor is mounted at J4 for IR control and supports RC5 protocol.
2.6
Interrupt LED
There is a blue interrupt LED (D21: INTR) which blinks whenever an interrupt is asserted
from the STLD325 device, which may be due to front panel key press, remote control key
press, RTC alarm, wake-up from standby, etc.
2.7
Interface connectors
Please refer to (10, 11) Figure 2, STEVAL-ILL029V2 consists of touch board interface
connectors (J6, J7) on which the STMPE24M31 touch board can be mounted. STEVALCBP007V1 also consists of two interface connectors J1, J2 refer to (4, 5) Figure 4. J1 on the
touch board connects with J6 on the STLED325 board while J2 on the touch board connects
with J7 on the STLED325 board.
2.8
Touch pads / 8-channel touch status type rotator
STEVAL-CBP007V1 consists of 8 touch pads for individual functions such as BRIGHT-,
BRIGHT+, CH+, CH-, OK, DEMO, STANDBY, and MENU. Figure 4 (2) refers to the touch
status type 8-channel rotator for brightness increase/decrease.
10/34
Doc ID 010039 Rev 1
UM1058
Getting started
3
Getting started
3.1
Package content
The STLED325 front panel with STMPE24M31 interface demonstration board package
includes:
3.2
●
STLED325 demonstration board (STEVAL-ILL029V2)
●
STMPE24M31 touch panel card (STEVAL-CBP007V1)
●
UM1058 user manual (this document)
●
Schematics
●
Gerber files
System requirements
The STEVAL-CBP007V1 board needs to be interfaced to the STEVAL-ILL029V2 host board
in such a way that connector J1, J2 (on touch board) connects with connectors J6, J7 (on
host board). The system operates by powering externally through an external adaptor (9 V18 V, 500 mA). The board can also be powered up using a laptop adaptor.
3.3
Powering on the system
As soon as DC power supply is plugged in, the system is up and running. PWR/STBY LED
(D4) is green with MUTE LED (D3) turned off.
3.4
Startup display sequence / default setting of the system
On startup the system displays a rotating text welcome message on the 7-segment display.
If the touch board is present, the message is “STLED325-STMPE24M31”; otherwise it
displays “STLED325”. 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 STM8S 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.
Doc ID 010039 Rev 1
11/34
System features (touch board connected)
4
UM1058
System features (touch board connected)
Connect the STEVAL-CBP007V1 board to STEVAL-ILL029V2 with connectors J1 (5-pin)
and J2 (4-pin) on the touch board, mating with the female connectors J6 (5-pin) and J7 (4pin), on the host board. It is important that the touch board is mounted with proper
orientation before the system is powered on.
On powering on the system, a rotating text message “STLED325-STMPE24M31” is
displayed on the 7-segment display. After this, channel-brightness information is displayed
followed by blinking, one time, of all LEDs present on the touch board. After this sequence is
over, the system is ready for operation. There are a total of 7 LEDs at the bottom of the
individual keys: BRIGHT+, BRIGHT-, CH+, CH-, OK, DEMO, and MENU. Touch of any of
these keys is indicated by blinking of the corresponding LED as well as a buzzer sound.
4.1
Channel number - brightness level display mode
In this mode the system displays the channel number (on the leftmost two 7-segment
display modules) and brightness level (on the rightmost two displays). Channel number and
brightness can be increased/decreased using the touchkeys provided on the board (CH+,
CH-, BRIGHT+, and BRIGHT-).
A similar operation can be performed using the remote control keys explained in
Section 4.4.
Maximum and minimum limits for the channel number are 99 and 00 while the maximum
and minimum values for brightness level are 16 and 1 (16/16, 1/16).
Brightness level is also shown by the number of discrete LEDs glowing. (1 LED each for 2
levels). Brightness level can also be increased/decreased using the 8-channel touch status
type rotator present on the board. The brightness increases on clockwise rotation and
decreases for anticlockwise rotation.
In one complete rotation, the brightness changes by 16 levels.
4.2
RTC operation
STLED325 also features an inbuilt RTC. A MENU key on the touch board is provided to
select RTC set/view options. Various touchkeys can be used to operate the real time clock.
Use the MENU touchkey to enter into menu options and navigate through them. Touch the
MENU once - “rtc' is displayed. Now touch OK to enter into RTC options. By using the
MENU key the user can navigate through:
“TIME” (view time), “DATE” (view date), “SETT”(set time), “SETD”(set date), “SETA”(set
alarm).
4.2.1
Display time
Choose MENU to go to “rtc” and then OK. “tIME” is displayed. Now choose OK again to go
to view time. “HH.MM” is displayed for a second to signify time display in Hours-Minutes
format, followed by current RTC time display with hours and minutes separated by a “.”.
Choose OK again to exit to the channel-brightness display.
12/34
Doc ID 010039 Rev 1
UM1058
4.2.2
System features (touch board connected)
Display date
Choose MENU and then OK. Now use the MENU touchkey again to reach “dAtE” and
choose 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 “.”. Choose OK again to exit to the channel-brightness display.
4.2.3
Set time
Choose MENU, and then OK. Use the MENU key to go to “SETT”. Now choose OK. The
system prompts to enter the time in “Hours-Minutes” format. Use front panel keys BRGHT+
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, choose OK. The time is set and the display returns to channelbrightness display.
4.2.4
Set date
Choose MENU, and then OK. Choose MENU again multiple times to go to “SETD”. Now
choose OK. The system prompts to enter the date in “Date-Month” format. Use touchkeys
BRIGHT+ and BRIGHT- to increase and decrease the value and CH- and CH+ to move
left/right. After adjusting the date, choose OK again. Now the system prompts to enter the
year (two digits “e.g 10 for 2010 and week day (1-Monday…..7-Sunday). After entering the
information, choose OK. The date is set and the system returns to channel-brightness
display.
4.2.5
Set alarm
Choose MENU, and then OK. Choose MENU again multiple times to go to “SETA”. Now
choose OK. The system shows the current RTC time and prompts to enter the 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 the alarm date, automatically. After adjusting the value, choose OK
again. The alarm is set and the system returns to channel-brightness display.
4.2.6
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 STLED325). If
the system is 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 (touchkey
press/RC key press) and the system returns to channel-brightness display mode.
Doc ID 010039 Rev 1
13/34
System features (touch board connected)
UM1058
Figure 11. Alarm display
4.3
Demo mode
The system enters into demo mode by using the DEMO touchkey on the front panel. In this
mode, scrolling text with varying brightness and increasing scrolling speed is displayed
continuously on the display.
Text displayed: “STLED325-STMPE24M31 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 channel-brightness display when either
any of the touchkeys or RC key is pressed, or RTC alarm condition is met.
4.4
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 are not currently implemented in the system. For more details, refer to the
STLED325 datasheet.
The following RC operations can be done using IR decoding feature of STLED325.
Device address programmed: 0x08
14/34
●
Channel up (key value: 7 and key value: 45)
●
Channel down (key value: 14 and key value: 44)
●
Brightness increase (key value: 8)
●
Brightness decrease (key value: 27)
●
DEMO (key value: 21)
●
STANDBY (key value: 12)
Doc ID 010039 Rev 1
UM1058
System features (touch board connected)
Figure 12. Example RC5 remote
4.5
1.
CH+
2.
CH-
3.
BRGHT+
4.
BRGHT-
5.
CH-
6.
CH+
7.
STANDBY
Standby mode
STLED325 also features standby power management to host. The system can enter into
standby mode by:
1.
Using standby touchkey
2.
Remote control standby key
On entering standby mode, the PWR/STBY LED (D4) turns red. The MUTE LED (D3) also
turns ON. “STBY” is displayed on the LED panel for about two seconds (refer to Figure 13),
after which the complete display is blanked (discrete LEDs also turned off), refer to
Figure 14. If the system is in display RTC mode (time/date display) when the standby key is
pressed, the 7-segment display does not get blanked but displays RTC during standby
mode (discrete LEDs are off). During standby, all the RC keys except the hot keys are nonfunctional.
Doc ID 010039 Rev 1
15/34
System features (touch board connected)
UM1058
Figure 13. Entering into standby
Figure 14. System is in standby
The system can wake up from standby through any of the following modes:
1.
A touch on any of the touchkeys
2.
Remote control hot key press (RC standby key configured as a hot key)
3.
RTC alarm
The system returns to channel-brightness display after wake-up from standby mode.
16/34
Doc ID 010039 Rev 1
UM1058
System features (touch interface not connected)
5
System features (touch interface not connected)
5.1
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 anticlockwise rotation.
5.2
Channel number - brightness level display mode
In this mode the system displays the channel number (on the leftmost two 7-segment
display modules) and brightness level on the rightmost two displays. Channel number and
brightness can be increased/decreased using the front panel keys provided on the board
(CH+, CH-, BRGHT+, BRGHT-).
A similar operation can be performed using remote control keys as explained in Section 5.5.
Maximum and minimum limits for channel number are 99 and 00 while the maximum and
minimum values for brightness level are 16 and 1 (16/16, 1/16).
Brightness level is also shown by number of discrete LEDs glowing. (1 LED each for 2
levels).
5.3
RTC operation
STLED325 also features an inbuilt 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.
Choose MENU to enter into menu options and navigate through them. Choose 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), “SETA”(set
alarm).
5.3.1
Display time
Choose MENU to go to “rtc” and then OK. “tIME” is displayed. Now press OK again to go to
view time. “HH.MM” is displayed for a second to signify time display in Hours-Minutes
format, followed by current RTC time display with hours and minutes separated by a “.”.
Choose OK again to exit to the channel-brightness display.
5.3.2
Display date
Choose MENU and then OK. Now use the MENU key again to reach “dAtE” and press 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 “.”.
Choose OK again to exit to the channel-brightness display.
Doc ID 010039 Rev 1
17/34
System features (touch interface not connected)
5.3.3
UM1058
Set time
Choose MENU and then OK. Use the MENU key to go to “SETT”. Now press OK. The
system prompts to enter the time in “Hours-Minutes” format. Use front panel keys BRGHT+
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 display returns to channelbrightness display.
5.3.4
Set date
Choose MENU and then OK. Choose MENU again multiple times to go to “SETD”. Now
press OK. The system prompts to enter the 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/right. After adjusting the date, choose OK again. Now the system prompts to enter the
year (two digits “e.g 10 for 2010 and week day (1-Monday…..7-Sunday). After entering the
information, press OK. The date is set and the system returns to channel-brightness display.
5.3.5
Set alarm
Choose MENU and then OK. Choose MENU again multiple times to go to “SETA”. Now
press OK. The system shows the current RTC time and prompts to enter the 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.
5.3.6
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 STLED325). If the
system is 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 mode.
5.4
Demo mode
The system enters into demo 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 on the display.
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 channel-brightness display when either
any of the front panel or RC key is pressed or the RTC alarm condition is met.
5.5
Remote control operation
The remote control operation remains the same as mentioned in Section 4.4.
18/34
Doc ID 010039 Rev 1
UM1058
5.6
System features (touch interface not connected)
Standby mode / hot keys
Standby operation remains the same as that mentioned in Section 4.5 except that the
system can enter into standby by:
●
Pressing the front panel standby key
●
Remote control standby key
During standby, all the front panel and RC keys except the hot keys are non-functional.
The system can wake up from standby by any of the following modes:
●
Wake-up key press
●
Front panel hot key press (STBY and OK are configured as hot keys)
●
Remote control hot key press (RC standby key configured as a hot key)
●
RTC alarm
The system returns to channel-brightness display after wake-up from standby mode.
Doc ID 010039 Rev 1
19/34
20/34
Doc ID 010039 Rev 1
5
N
4
675
5
N
9
&
X)
',*
',*
',*
',*
',*
087(/('
'
087(
9
67/('
.(
