AAT2833/34
240mA Total Display Solution
for Portable Devices
R
Data
RGB Current as % of BSET
IR = ISINK
·
T
1
2
3
4
5
6
7
0
33
66
100
133
167
200
G
T
B
T
IG = ISINK
IB = ISINK
·
·
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 TOFF (500µs) will
activate the AAT2833/34's shutdown mode. Data
and Address registers are cleared (reset to 0) dur-
ing shutdown.
Table 7: Address 12, RGB Current Level
Register (ISINK).
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 ISINK
registers, as follows:
R
ISINK
ISINK
Red
T
G
ISINK
Green
B
ISINK
Blue
Figure 3: RGB Diode Current Timing.
14
2833.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
