AATIAN46 Datasheet, PDF (2/4 Pages) SiGe Semiconductor, Inc. – Multi-Mode Charge Pump For White LED Backlight and Flash Applications

EV-113
AAT2801 EVAL: Multi-Mode Charge Pump For
White LED Backlight and Flash 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
are three other jumpers labeled LT, MV, and FL. They provide access to EN/SET, EN_FL, and EN3, respec-
tively. 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. Ensure that LT, MV, and FL are jumpered so that the micro-
controller can control the parts.
The user interface is provided by three buttons. The buttons are LIGHT, MOVIE, and FLASH. The modes of
operation are detailed in Table 1. Each button handles a particular function. The LIGHT button controls the
backlight section. When the LIGHT button is held down, the MCU will auto-cycle through the available bright-
ness level settings after a short delay. The MOVIE button toggles on/off the movie mode illumination. The
FLASH button provides a flash pulse and a red-eye reduction function. When the FLASH button is held down,
red-eye reduction mode will be entered after a short delay.
Button(s) Pushed¹
LIGHT
MOVIE
FLASH
LIGHT + FLASH
LIGHT + MOVIE + FLASH
Description
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.
Toggle on/off movie mode illumination.
Press once to produce a ~300ms flash pulse. Hold down to produce a sequence of
red-eye reduction pulses.
Decrement the number of EN/SET edges. Toggles through the available bright-
ness level settings for the backlighting section. If held down, auto-cycle through
the settings.
Reset. All enable lines are pulled low.
Table 1: User Interface Functionality.
1. The '+' sign indicates that the specified buttons are all pressed and released together.
2
EV-113.2005.06.1.0