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Revision 1.0 / 2012/09/14
Application Note: AS1122-AN01 – Demoboard Description
AS1122
AN01-Demoboard
Description
AS1122 – AN01
Demoboard Description
www.ams.com Revision 1.0 / 9/14/12
page 1/23
Table of Contents
1
General Description ............................................................................................................. 2
1.1
Kit Content ........................................................................................................................... 3
2
Getting Started ..................................................................................................................... 4
3
Hardware Description........................................................................................................... 5
3.1
Evaluation Board Description ............................................................................................... 5
3.2
AS1122 USB Interface Board Description ........................................................................... 7
3.3
RGB LED Board ................................................................................................................... 8
3.4
Standard LED Board ............................................................................................................ 9
4
Software Description .......................................................................................................... 10
4.1
Section Devices ................................................................................................................. 11
4.2
Section Current Frame ....................................................................................................... 11
4.3
Section Frame Control ....................................................................................................... 12
4.4
Timing Control .................................................................................................................... 13
5
Board Schematics, Layout and BOM ................................................................................. 13
5.1
Schematics, Layout and BOM AS1122 Evaluation Board ................................................. 13
5.2
Schematics and Layout USB Interface Board ................................................................... 16
5.3
Schematics, Layout and BOM RGB LED Board ................................................................ 19
5.4
Schematics, Layout and BOM Standard LED Board ......................................................... 21
6
Ordering Information .......................................................................................................... 22
Revision History
Revision Date Owner Description
1.0 14.09.2012 mkc Initial release
AS1122 – AN01
Demoboard Description
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1 General Description
This document describes the AS1122 Evaluation Kit.
The AS1122 is a 12-channel. Constant current-sink LED driver with 4096-step greyscale PWM
brightness control and 64-step constant-current sink (dot correction).
The Evaluation Kit allows to supply all components by the PC USB Port. No external supply or
battery is needed. Except the USB cable (included), no wiring is needed which allows a fast and
comfortable evaluation of the AS1122.
The graphical user interface (GUI) runs on PC running Windows 7 and allows the user to control the
AS1122.
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Demoboard Description
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1.1 Kit Content
The AS1122 Evaluation Kit includes all items listed in Figure 1: Kit Content.
Figure 1: Kit Content
Label Item Comment
1 AS1122 Evaluation Board
2 AS1122 USB Interface Board
3 RGB LED Board Snap on board
4 Standard LED Board Snap on board
5 USB Cable Data & Supply
6 USB Data Stick Documents and Software
6
2
1
3
4
5
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Demoboard Description
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2 Getting Started
Drive the AS1122 only with the recommended settings and values as described in the datasheet.
Please check www.ams.com for the latest version.
For a detailed description of the Kit please read sections 3-5 of this document.
− Connect the LED board (see 3.3 RGB LED Board or 3.4 Standard LED Board) and make sure
“J5” and “Riref” are placed on the AS1122 Evaluation Board.
− Connect AS1122 USB Interface Board and make sure “J2” is placed to supply the AS1122
Evaluation Board with 3.3V
− Start the GUI and connect the USB cable via connector “A” to a powered USB port. Connector
“A” is also used for the data transfer.
− Enable “Direct Mode” in the GUI, choose “DOT” in the Source Selection and set the dot
correction (DC current) for each channel. Enable all outputs by clicking the red LED above “All”.
Select “PWM” in the Source Selection and set the PWM data (timing) for each channel.
If there are questions do not hesitate to contact us.
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Demoboard Description
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3 Hardware Description
3.1 Evaluation Board Description
The AS1122 Evaluation Board is powered via an external power supply or via Line in connector.
The AS1122 can be controlled with the AS1122 USB Interface Board or any other Controllerboard
via 10 pole connector which enables fast code debugging.
It supports connection of various LED testboards via 20 pole connector. The external LED boards
can be supplied via VLED connector or via VDD.
The AS1122 Evaluation Board also enables easy chaining of AS1122 without additional wiring.
Figure 2: Evaluation Board Connectors
Label Name Designator
Description Info
A VDD, GND
BU1, BU2 Supply Voltage Supply Voltage Range: 2.7V to 3.6V
B VLED BU3 LED Supply
Voltage
Maximum 30V LED Supply Voltage
C IN J1 Line In
Connector
Can be connected to USB Interface
Board, general purpose controllerboard
or OUT “G” of the previous AS1122
Evaluation Board in chained mode
D OUT J2 Line Out
Connector
Can be connected to IN “A” of next
AS1122 Evaluation Board in chained
mode. Set Jumper C & D for chained
mode.
E J4 J4 LED Connector Connect LED board to this Connector.
The Kit comes with RGB and standard
LED board.
A
B
C
D
E
F
G
H
I
J
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Label Name Designator
Description Info
F chain
SCLK
J6 Connect more
devices in series
Chained
Single board or last board in
chain
G chain SDO J3 Connect more
devices in series
Chained
Single board or last board in
chain
H RIref J8 Reference
Current Resistor
Place a 1k to 10kOhm resistor here. The
board comes with a mounted 10kOhm
resistor.
I J7 J7 OUT 6 Remove jumper to demonstrate open
detection on OUT6
J J4 J4 LED Connector Connect LED board to this Connector.
The Kit comes with RGB and standard
LED board.
Notes:
− Supply board only via connector “A” or via “C”. Never use both supply possibilities at the same
time!
Figure 3: Evaluation Board Pinout
Pinout “J1” Pinout “J7” Single Pinout “J1” Chained
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Figure 4: Pinout “J4” LED Connector
3.2 AS1122 USB Interface Board Description
The USB Interface Board allows control of the AS1122 with the delivered graphical user interface
(GUI). It allows to supply the AS1122 Evaluation board with the PC USB Port without need of an
additional supply or battery. Except the USB cable no wiring is needed for a fast evaluation of the
AS1122.
Figure 5: USB Interface Board
Label Name Designator
Description Info
A U2 USB Interface Data interface and board supply
B RST S2 Reset Resets the AS1122 Evaluation Board
C J1 Line Out Connector Can be connected to AS1122
B
A
C
D
E
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Demoboard Description
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Label Name Designator
Description Info
Evaluation Board
D Vout J2 Supply Jumper Set jumper to supply AS1122
Evaluation Board with 3.3V
E J3 ICP Interface For details see PIC24FJ64GB
datasheet
Figure 6: USB Interface Board Pinout
Pinout “J1” Pinout “J3”
3.3 RGB LED Board
The RGB LED Board can be attached to the AS1122 Evaluation board by the 20-pin connector. The
attachable LED board enables easy testing of various LEDs with minimum effort and costs.
Figure 7: RGB LED Board
Label Name Designator
Description Info
A J1 LED Interface Can be connected to AS1122
Evaluation Board
A
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Demoboard Description
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Figure 8: RGB LED Board Pinout “J1”
3.4 Standard LED Board
The Standard LED Board has mounted twelve 1206 LEDs. It can be attached to the AS1122
Evaluation board by the 20-pin connector. The attachable LED board enables easy testing of
various LEDs with minimum effort and costs.
Figure 9: Standard LED Board
Label Name Designator
Description Info
A J1 LED Interface Can be connected to AS1122
Evaluation Board
Figure 10: Standard LED Board Pinout “J1”
A
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4 Software Description
The graphical user interface (GUI) is used in combination with the AS1122 USB Interface board
(PIC24 MCU) to control the AS1122.
Start the GUI and setup the Hardware according section 2 Getting Started.
Make sure hardware is recognized and red indicators on the bottom right side of the GUI are turning
green.
Figure 11: AS1122 Evaluation Software
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Demoboard Description
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4.1 Section Devices
Select number of chained AS1122 Evaluation Boards. The maximum number of four is just limited
by software.
Figure 12: GUI Section Devices
4.2 Section Current Frame
Set the Greyscale PWM Control and Dot Correction data of the AS1122 in this Section.
Figure 13: GUI Section Current Frame
Label
Name Comment
A Device Select to which AS1122 the data should be written. Only necessary if
Number of Devices is bigger than one.
B D1..D12 Enable individual outputs of AS1122.
Note that this is just a software feature for easier programming. Value
of zero will be written to AS1122.
C D1..D12 Choose values to be written to AS1122 registers depending on “Source
A
C
D
B
E
F
G
H
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Label
Name Comment
Selection”. Use either the slider or enter number in field.
D All Set all channels to same values.
Note that this is just a software feature for easier programming.
E Source Selection Select if Dot Correction or PWM data should be controlled/written.
F LED Type Select if Standard LED Board or RGB Board is attached.
Note that this is just a visualization feature for easier programming
G Direct Mode Select for immediate data transfer to AS1122.
H Live Mode If selected data is visualized during frame playback.
4.3 Section Frame Control
The frame Control is just a software feature to demonstrate an animation (sequence of frames).
There is no storage of the frames on the AS1122.
Figure 14: GUI Frame Control
Label
Name Comment
A Modify Add, remove and copy frames here. Selected frame and total number
of frames is displayed above.
B Move Move position of frame in the sequence. Also possible for all devices in
a chain if checkbox is selected.
C Control Frame selection and playback start.
D Load Load previously saved frame data.
E Save Store actual frame data.
A
B
C
D
E
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Demoboard Description
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4.4 Timing Control
Timing Control is just a software feature to demonstrate an animation (sequence of frames). The
data is not stored inside the AS1122.
Select update rate for all frames and if the sequence should be repeated or just displayed once.
Figure 15: GUI Timing Control
5 Board Schematics, Layout and BOM
5.1 Schematics, Layout and BOM AS1122 Evaluation Board
The AS1122 Evaluation Board is a 2-layer FR4 board. The main component is the AS1122 with
some passive components, several testpoints and connectors.
Figure 16: AS1122 Evaluation Board Schematic
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Demoboard Description
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Figure 17: Top Layer and Silk Screen AS1122 Evaluation Board
Figure 18: Bottom Layer AS1122 Evaluation Board (top through view)
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Demoboard Description
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Figure 19: Bill of Materials AS1122 Evaluation Board
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Demoboard Description
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5.2 Schematics and Layout USB Interface Board
The AS1122 Evaluation Board is a 2-layer FR4 board. The main components are the PIC24FJ64GB
microcontroller and the AS1360 LDO for power supply with passive components, several testpoints
and connectors.
Figure 20: USB Interface Board Schematic
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Demoboard Description
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Figure 21: Top Layer and Silk Screen USB Interface Board
Figure 22: Bottom Layer USB Interface Board (top through view)
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Demoboard Description
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Figure 23: Bill of Materials USB Interface Board
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Demoboard Description
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5.3 Schematics, Layout and BOM RGB LED Board
The RGB LED Board is a 2-layer FR4 board. Four RGB LEDs and a connector are mounted.
Figure 24: RGB LED Board Schematic
Figure 25: Top Layer and Silk Screen RGB LED Board
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