AAT3128ITO-T1 ANALOGICTECH, AAT3128ITO-T1 Datasheet - Page 8

• Manufacturer Part Number: AAT3128ITO-T1
• Description: RGB LED FASHION LIGHTING CONTROLLER
• Manufacturer: ANALOGICTECH

Specifications of AAT3128ITO-T1

• Led Driver Application: Backlighting, PDAs
• No. Of Outputs: 3
• Output Current: 60mA
• Input Voltage: 2.7V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Driver Case: RoHS Compliant
• Topology: Charge Pump

based on the current set level programmed by the R
resistor. The second dimming level is fixed at 6dB below
that programmed by the R
color change for a given mood light option can be set to
a fast or slow rate.
Through the S
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™
(S
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 (T
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 T
EN/SET Timing
8
ChargePump
2
Cwire) interface. The interface records rising edges of
2
Cwire interface, mood options allow the
TM
SS
). During the soft start time, mul-
EN/SET
Code
SET
resistor. The pace of the
OFF
Figure 1: S
w w w . a n a l o g i c t e c h . c o m
1
2
Cwire Timing Diagram.
SET
OFF
t
LO
t
HI
timeout period. After the T
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
Table 2: AAT3128 S
2
M1
M2
M3
M4
Data
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
RGB LED Fashion Lighting Controller
Electric Beat
Rainbow 1
Rainbow 2
Table 1: Programmable RGB LED
Firelight
Name
3
Bright/Dim
Color Lighting “Moods.”
D
D
D
D
D
D
D
D
B
B
B
B
B
B
B
B
PRODUCT DATASHEET
t
Pulsing Blue – White – Red color tones
OFF
Full color wheel control with continu-
Full color wheel control with varied
2
Red-Orange-Yellow fl ickering light
Cwire Programming Modes.
OFF
OFF
ous smooth transitions
Color Description
timing for transitions
time out time, all internal
AAT3128
Fast/Slow
S
S
S
S
S
S
S
S
F
F
F
F
F
F
F
F
3128.2008.02.1.1
Mood
M1
M2
M3
M4
M1
M2
M3
M4
M1
M2
M3
M4
M1
M2
M3
M4