AAT2833/34
240mA Total Display Solution
for Portable Devices
in data values. When EN/SET is held low longer
than TOFF (500µs), the AAT2833/34 enters shutdown
mode operation and draws less than 1µA from the
input supply voltage. Data and address registers are
cleared (reset to 0) in shutdown mode operation.
Backlight Current Control
(Addresses 0-2)
The six channel backlight inputs, BL1-BL6, can
drive six individual LEDs to a maximum current of
2
30mA per channel. The EN/SET AS Cwire serial
2
interface enables all channels and sets the current
magnitude as a percentage of the maximum cur-
rent, programmed by an external resistor at BSET
(see Figure 4). To set the backlight current (mini-
mum to maximum current) of the main display
LEDs (BL1-BL4), the user would write data to
Address 1. To set the backlight current for the sub
display LEDs (BL5-BL6), the user would write data
to Address 2. To write to both main display and sub
display LEDs (BL1-BL6) at the same time, the user
would write to Address 0.
Table 1a contains the AS Cwire serial interface
address functionality when independent channel
control is disabled (independent channel control is
disabled by default) and conversely Table 1b con-
2
tains the AS Cwire serial interface address function-
ality when independent channel control is enabled.
EN/SET
Rising
Address Edges
Function
0
1
17
18
Backlight Current BL1-BL6
Main Backlight Current
BL1-BL4
Data BL % of BSET Data BL % of BSET
2
3
7
8
9
10
11
12
15
19
20
24
25
26
27
28
29
32
Sub Backlight Current BL5-BL6
Low Backlight Current
Red Color
1
2
3
4
5
6
7
8
0
9
44
51
56
63
71
79
89
100
21
22
25
29
32
35
40
10
11
12
13
14
15
16
Green Color
Blue Color
RGB Intensity
RGB Mode
RGB Current
Backlight Independent
Channel Control
Table 2a: Addresses 0-2 with Independent
Channel Control Disabled, Backlight
Current Level.
2
Table 1a: AS Cwire Serial Interface Addressing
with Independent Channel Control Disabled.
Data BL % of BSET Data BL % of BSET
EN/SET
Rising
1
2
3
4
5
6
7
8
0
9
44
51
56
63
71
79
89
100
21
22
25
29
32
35
40
10
11
12
13
14
15
16
Address
Edges
Function
0
1
2
3
7
8
9
10
11
12
15
17
18
19
20
24
25
26
27
28
29
32
Not Applicable
Backlight Current BL1-BL6
BL1-BL4 On/Off Control
BL5-BL6 On/Off Control
Red Color
Green Color
Blue Color
RGB Intensity
RGB Mode
RGB Current
Not Applicable
Table 2b: Address 1 with Independent
Channel Control Enabled, Backlight
Current Level.
2
Table 1b: AS Cwire Serial Interface Addressing
with Independent Channel Control Enabled.
10
2833.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
