AATIAN58 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

EV-126
AAT3143 EVAL: High Efficiency 1X/1.5X/2X
Charge Pump for White LED Applications
Getting Started
In most cases, the board ships mounted onto a bat-
tery pack. The battery pack holds three AAA size,
conventional alkaline batteries. A jumper is inline
with the battery supply for connecting/disconnecting
power. There is an additional jumper labeled ON
SRL OFF. It provides access to EN/SET. For opera-
tion, ensure that it is in the ON SRL position. To
apply power to the board, connect the supply by
jumpering ON, MCU. The red LED7 should illumi-
nate, indicating that power has been connected.
The user interface is provided by three buttons:
CYCLE, UP, and DOWN. The modes of operation
are detailed in Table 1. Each button controls a par-
ticular function. The CYCLE button toggles on/off
auto-cycling. The UP button increments to the next
number of EN/SET edges. When the UP button is
held down, the MCU will auto-increment through all
of the settings after a short delay. Pressing the
DOWN button decrements the number of EN/SET
edges. When the DOWN button is held, the MCU
will auto-decrement through all of the settings.
User Interface Functionality
Button(s) Pushed
CYCLE¹
UP
DOWN
CYCLE + UP + DOWN²
Description
Toggle on/off auto-cycling. Cycles through the available brightness level
settings.
Increment the brightness setting. If held down, auto-cycle through the
settings.
Decrement the brightness setting. If held down, auto-cycle through the
settings.
Reset. Enable line is pulled low.
Table 1: User Interface Functionality.
1. The auto-cycling speed is adjusted with the 10K POT, VR4. Turn clockwise to speed up and counter-clockwise to slow down.
2. The '+' sign indicates that these buttons are all pressed and released together.
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EV-126.2006.02.1.0