LP3954 Datasheet, PDF (20/56 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

MODE CONTROL IN FREQUENCY MODE
Mode control has two setups based on audio synchronization mode select: the frequency mode and the amplitude mode. During
the frequency mode user can select two filter options by MODE_CTRL as shown below. User can select the filters based on the
music type and light effect requirements. In the first mode the frequency range extends to 8 kHz in the secont to 4 kHz.
The lowpass filter is used for the red, the bandpass filter for the blue and the hipass filter for the green LED.
Higher frequency mode
MODE_CTRL = 00 and SYNC_MODE = 1
Lower frequency mode
MODE_CTRL = 01 and SYNC_MODE = 1
20132227
20132228
MODE CONTROL IN AMPLITUDE MODE
During the amplitude synchronization mode user can select between three different amplitude mappings by using
MODE_CTRL select. These three mapping option gives different light response. The modes are shown in the tables below.
Non-overlapping mode
MODE_CTRL[1:0] = [01]
Partly overlapping mode
MODE_CTRL[1:0] = [00]
www.national.com
20132229
20
20132230