AATIAN79 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – Single RGB Controller

EV-131
AAT4295 EVAL: Single RGB Controller
Getting Started
An external power supply is required; connect the positive terminal to DC+ and the negative terminal to DC-.
The power supply voltage level can be set anywhere between 1.8V and 5.5V. To simulate operation from an Li-
Ion battery source, set the power supply to 3.6V. After applying power to the board, ensure that the jumper J1
is in the ON position.
There are five momentary push button switches on the board, labeled SW1 through SW5. After a switch or
combination of switches are pressed and released, the on-board microcontroller will send the corresponding
S²Cwire programming data to the AAT4295's EN/SET pin. The AAT4295 output settings table can be found in
the product datasheet (Table 1, page 9). Two common Anode type RGB are used for system load. The
AAT4295’s low-side switches connect each red, green and blue LED to ground with a series ballast resistor to
control the forward current through the LED. The circuit is typically used for fashion lighting applications in
portable products such as mobile phone handsets.
By pressing SW1, all outputs should be turned on. All outputs are reset and RGBs should turn off by pressing
SW5 once.
Holding switches SW1 and SW5 together for longer than 1.5 seconds activates the auto cycling mode through
the microcontroller. The microcontroller will submit a burst of edges, pause, and submit another burst of edges
and so on. It starts by submitting 8 edges, then submitting 7 edges, and so on, submitting 1 edge at the end.
The two RGB LEDs should blink three times before the sequence of auto-cycling. Other detailed operations
are described in Table 1.
User Interface Functionality
Switch(es) Pushed
SW1
SW2
SW3
SW4
SW5
SW1 + SW5
Description
[Push/Release once] Turn on all. (RGB becomes White LED)
[Push/Release once] Toggle On/Off of S1 (red LED).
[Push/Release once] Toggle On/Off of S2 (green LED).
[Push/Release once] Toggle On/Off of S3 (blue LED).
[Push/Release once] Reset: Turn off all.
[Push/Release together] Auto Cycling. Blinks (On/Off) for three times and goes into
Binary-decrement mode for 3 times.
Table 1: User Interface Functionality
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EV-131.2007.01.1.0