AAT3128_08 datasheet(8/12 Pages) ANALOGICTECH

8 / 12 page

AAT3128

RGB LED Fashion Lighting Controller

ChargePumpTM

PRODUCT DATASHEET

3128.2008.02.1.1

www .analogictech.com

based on the current set level programmed by the RSET

resistor. The second dimming level is fixed at 6dB below

that programmed by the RSET resistor. The pace of the

color change for a given mood light option can be set to

a fast or slow rate.

Through the S2Cwire interface, mood options allow the

user to select between four different moods, each with

two brightness levels and two speeds, based on the

number of rising edges of the EN/SET pin. 16 unique

moods are selected based on the settings in Table 2.

EN/SET Serial Interface

The lighting mood output is controlled by the EN/SET

pin, using AnalogicTech’s Simple Serial Control™

(S2Cwire) interface. The interface records rising edges of

the EN/SET pin, and decodes them into 16 individual set-

tings based on an internal preset ROM table. The inter-

face counter can be clocked at speeds up to 1MHz. The

rising edges of EN/SET input enable the IC and are

counted for 1 to 16 edges based on the desired mode.

Once the final clock cycle is input for the desired mode

the EN/SET pin is held high to enable the device output.

The device is disabled 500μs after the EN/SET pin transi-

tions to a logic low state.

The EN/SET timing is designed to accommodate a wide

range of data rates. After the first rising edge of EN/SET,

the charge pump is enabled and reaches full capacity after

the soft-start time (TSS). During the soft start time, mul-

tiple clock pulses may be entered on the EN/SET pin to set

the final output current level with a single burst of clocks.

A constant current is sourced and the programmed color

mood is enabled as long as EN/SET remains in a logic high

state. The current source outputs are switched off after

EN/SET has remained in a low state for at least the TOFF

timeout period. After the TOFF time out time, all internal

registers are reset and the charge pump is disabled.

It is advisable to issue a 500μs low pulse to reset the data

registers before send new sets of data to change lighting

modes. This will avoid any possibility of losing synchroni-

zation between the AAT3128 and the system MCU.

Mood

Name

Color Description

Rainbow 1

Full color wheel control with continu-

ous smooth transitions

Electric Beat Pulsing Blue – White – Red color tones

Rainbow 2

Full color wheel control with varied

timing for transitions

Firelight

Red-Orange-Yellow ﬂickering light

Table 1: Programmable RGB LED

Color Lighting “Moods.”

Data

Bright/Dim

Fast/Slow

Mood

Table 2: AAT3128 S2Cwire Programming Modes.

EN/SET Timing

EN/SET

Code

OFF

tOFF

Figure 1: S2Cwire Timing Diagram.

AAT3128 Datenblatt(PDF) 8 Page - Advanced Analogic Technologies

AAT3128 Datenblatt(HTML) 8 Page - Advanced Analogic Technologies

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datenblatt Download

Link URL