AATIAN60 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – High Efficiency 1X/1.5X/2X Charge Pump For White LED Applications

EV-118
AAT3152 EVAL: High Efficiency 1X/1.5X/2X
Charge Pump For White LED Applications
Getting Started
In most cases, the board ships mounted onto a battery pack. The battery pack holds three AAA size, conven-
tional 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 operation, 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 illuminate, 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 handles a particular 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) Pushed¹
CYCLE²
UP
DOWN
CYCLE + UP + DOWN
Description
Toggle on/off auto-cycling. Auto-increments EN/SET edges and cycles through the
available brightness level settings.
Increment the number of EN/SET edges. Toggles through the available brightness level
settings for the backlighting section. If held down, auto-cycle through the settings.
Decrement the number of EN/SET edges. Toggles through the available brightness
level settings for the backlighting section. If held down, auto-cycle through the settings.
Reset. Enable line is pulled low.
Table 1: User Interface Functionality.
1. The '+' sign indicates that these buttons are all pressed and released together.
2. The auto-cycling speed is adjusted with the 10K POT, VR4. Turn clockwise to speed up and counter-clockwise to slow down.
2
EV-118.2005.06.1.0