AAT2833 Datasheet, PDF (14/20 Pages) Advanced Analogic Technologies – 240mA Total Display Solution for Portable Devices

AAT2833/34
240mA Total Display Solution
for Portable Devices
Data
1
2
3
4
5
6
7
RGB Current as % of BSET
0
33
66
100
133
167
200
Table 7: Address 12, RGB Current Level
Register (I_SINK).
RGB LED Current Calculation
The average current in a particular color channel is
a function of the values in the R, G, B, T, and I_SINK
registers, as follows:
R
Red
I_SINK
G
Green
I_SINK
Blue
I_R = I_SINK ·
R
T
I_G = I_SINK ·
G
T
I_B = I_SINK ·
B
T
Shutdown
Since the channel backlight power returns are the
only power returns for all the LEDs, there is no
leakage current if all channels are disabled.
Applying a HIGH-to-LOW transition on the EN/SET
pin and holding LOW for at least T_OFF (500µs) will
activate the AAT2833/34's shutdown mode. Data
and Address registers are cleared (reset to 0) dur-
ing shutdown.
I_SINK
T
B
I_SINK
Figure 3: RGB Diode Current Timing.
14
2833.2007.09.1.0