AATIAN81 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – Dual RGB Controller

EV-132
AAT4297 EVAL: Dual 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 switches on the board, labeled SW1 through SW5. When a switch or combination of switches
are pressed and released, the on-board microcontroller sends the corresponding S²Cwire programming data
to the AAT4297's EN/SET pin. The AAT4297 output settings table can be found in the product data sheet
(Table 1, page 10). Two common Anode type RGB LEDs are used for system load. The AAT4297’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 SW2+SW3+SW4 together, all outputs should be turned on. All outputs are reset and RGBs should
turn off by pressing SW1+SW5 together.
Holding switches SW1 and SW5 together for longer than 1.5 seconds will activate auto cycling 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 64 edges, then submitting 63 edges, and so on, submitting 1 edge at the
end. 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
SW2
SW3
SW4
SW1 + SW2
SW1 + SW3
SW1 + SW4
SW5 + SW2
SW5 + SW3
SW5 + SW4
SW1 + SW5
SW2 + SW3 + SW4
Description
[Push/Release once] Toggle On/Off of S1 and S4 (red LED only on both RGBs)
[Push/Release once] Toggle On/Off of S2 and S5 (green LED only on both RGBs)
[Push/Release once] Toggle On/Off of S3 and S6 (blue LED only on both RGBs)
[Push/Release once] Toggle On/Off of S1 (red LED only on RGB1)
[Push/Release once] Toggle On/Off of S2 (green LED only on RGB1)
[Push/Release once] Toggle On/Off of S3 (blue LED only on RGB1)
[Push/Release once] Toggle On/Off of S4 (red LED only on RGB2)
[Push/Release once] Toggle On/Off of S5 (green LED only on RGB2)
[Push/Release once] Toggle On/Off of S6 (blue LED only on RGB2)
[Push/Release once] Reset: Turn off all
[Hold 1.5+ sec.] Auto Cycling. Blinks (On/Off) for three times and goes into Binary-
decrement mode for 3 times
[Push/Release once] Reset: Turn on all
Table 1: User Interface Functionality.
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EV-132.2007.01.1.0