AAT3129_07 ANALOGICTECH [Advanced Analogic Technologies], AAT3129_07 Datasheet - Page 10

• Manufacturer Part Number: AAT3129_07
• Description: High Efficiency 1X/1.5X/2X Charge Pump for RGB Color LED Applications
• Manufacturer: ANALOGICTECH [Advanced Analogic Technologies]

Applications Information
AS
The Advanced Simple Serial Control digital interface
is used to set the color, overall intensity, and method
of update for the R, G, and B channels. The intensi-
ty for each channel is set by dedicated 4-bit registers
giving each channel 16 levels of brightness and
resulting in 4096 possible color combinations. In
addition to the three color registers, there is an inten-
sity register and a mode register. The intensity reg-
ister sets the overall intensity and provides 16 glob-
al brightness levels. The mode register toggles the
method of update between two possibilities.
Depending on the mode register setting, the
AAT3129 will update the R, G, and B channels
immediately or update them only when the intensity
register is updated.
AS
EN/SET pin to address and load the registers.
AS
AS
AS
10
2
2
Cwire relies on the number of rising edges of the
Cwire latches data or address after the EN/SET
2
2
2
Cwire Serial Interface
Cwire Serial Interface Timing
Cwire Serial Interface Addressing
Address
1
2
3
4
5
R, B, T, M
Address
EN/SET
G
EN/SET Rising Edges
1
2
17
18
19
20
21
Address
T
LO
17
1
T
HI
High Efficiency 1X/1.5X/2X Charge Pump
18
T
LAT
pin has been held high for time T
data is differentiated by the number of EN/SET rising
edges. Since the data registers are 4 bits each, the
differentiating number of pulses is 2
address 1 is signified by 17 rising edges, address 2
by 18 rising edges, and so forth. Data is set to any
number of rising edges between 1 and including 16.
A typical write protocol is a burst of EN/SET rising
edges, signifying a particular address, followed by a
pause with EN/SET held high for the T
period, a burst of rising edges signifying data, and a
T
is set, then multiple writes to the corresponding data
register are allowed.
When EN/SET is held low for an amount of time
greater than T
down mode and draws less than 1μA from the sup-
ply. Address 1 is the default address on the first ris-
ing edge after the AAT3129 has been disabled.
When shutdown mode is entered, the Address and
Data registers are reset to 1.
LAT
for RGB Color LED Applications
1
1
timeout for the data registers. Once an address
1
Data Register
2 . . .
M
R
G
B
T
Data
OFF
n <= 16
2
, the AAT3129 enters into shut-
T
LAT
n
Description
Intensity
LAT
Green
Mode
4
Blue
Red
or 16, so that
. Address or
3129.2007.01.1.4
LAT
timeout