AAT2830/31
800mA Total Display Solution
for Portable Devices
With independent channel control enabled, the
functionality of Addresses 1, 2, and 3 will conform to
what is described in Tables 2b, 5, and 6. Also,
Addresses 0 and 15 are no longer applicable after
independent channel control has been enabled. As
indicated by the possible settings listed in the
tables, any combination of backlight channels can
be enabled and disabled. The original functionali-
ties (Sub Backlight Current BL5-BL6 and Low
Backlight Current) of Addresses 2 and 3 are no
longer available unless the internal state machine
has been reset to default mode operation (when
EN/SET is logic low for >500µs). The functionality
of Addresses 7-12 are unmodified by the enabling of
independent channel control.
Data
1
2
3
4
5
6
7
8
BL6
BL5
BL4
BL3
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
9
10
11
12
13
14
15
16
Flash/Movie Mode Operation
The flash current level is set via the serial interface
according to a logarithmic scale where each code
is 1.5dB lower than the previous code. By writing in
Address 4, a total flash current of 19mA to 150mA
can be programmed to each of the four flash output
channels (see Table 7 and Figure 3). For lower cur-
rent applications, such as torch, flashlight, or movie
light, write to Address 5 to enable FL1 only, or FL2-
FL4 only (see Table 8). Higher flash currents can
be produced by combining one or more of the FL1-
FL4 flash current outputs.
Table 5: Address 2 with Independent
Channel Control Enabled, BL3-BL6
On/Off Control.
Data
BL2
BL1
1
2
3
4
5
6
7
8
9
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Data
Flash Current (mA)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
150
130
114
99
86
75
65
57
50
43
38
33
28
25
22
19
10
11
12
13
14
15
16
Table 6: Address 3 with Independent
Channel Control Enabled, BL1-BL2
On/Off Control.
Table 7: Address 4, Flash Current Level.
12
2830.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
