AAT2833 Datasheet, PDF (10/20 Pages) Advanced Analogic Technologies – 240mA Total Display Solution for Portable Devices

in data values. When EN/SET is held low longer
than T_OFF (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.
Table 1a contains the AS²Cwire serial interface
address functionality when independent channel
control is disabled (independent channel control is
disabled by default) and conversely Table 1b con-
tains the AS²Cwire serial interface address function-
ality when independent channel control is enabled.
EN/SET
Rising
Address Edges
Function
0
17
Backlight Current BL1-BL6
1
18
Main Backlight Current
BL1-BL4
2
19 Sub Backlight Current BL5-BL6
3
20
Low Backlight Current
7
24
Red Color
8
25
Green Color
9
26
Blue Color
10
27
RGB Intensity
11
28
RGB Mode
12
29
RGB Current
15
32
Backlight Independent
Channel Control
Table 1a: AS²Cwire Serial Interface Addressing
with Independent Channel Control Disabled.
Address
0
1
2
3
7
8
9
10
11
12
15
EN/SET
Rising
Edges
17
18
19
20
24
25
26
27
28
29
32
Function
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 1b: AS²Cwire Serial Interface Addressing
with Independent Channel Control Enabled.
10
AAT2833/34
240mA Total Display Solution
for Portable Devices
Backlight Current Control
(Addresses 0-2)
The six channel backlight inputs, BL1-BL6, can
drive six individual LEDs to a maximum current of
30mA per channel. The EN/SET AS²Cwire serial
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.
Data BL % of BSET
1
0
2
21
3
22
4
25
5
29
6
32
7
35
8
40
Data
9
10
11
12
13
14
15
16
BL % of BSET
44
51
56
63
71
79
89
100
Table 2a: Addresses 0-2 with Independent
Channel Control Disabled, Backlight
Current Level.
Data BL % of BSET
1
0
2
21
3
22
4
25
5
29
6
32
7
35
8
40
Data
9
10
11
12
13
14
15
16
BL % of BSET
44
51
56
63
71
79
89
100
Table 2b: Address 1 with Independent
Channel Control Enabled, Backlight
Current Level.
2833.2007.09.1.0