AAT2830/31
800mA Total Display Solution
for Portable Devices
or 16, so that Address 0 is signified by 17 rising
edges, Address 1 by 18 rising edges, Address 2 by
19 rising edges, and so on. Data is set to any num-
ber of rising edges between 1 and including 16.
EN/SET
Rising
Address
Edges
Function
0
1
2
3
4
5
6
7
8
17
18
19
20
21
22
23
24
25
26
27
28
29
32
Not Applicable
Backlight Current BL1-BL6
BL1-BL4 On/Off Control
BL5-BL6 On/Off Control
Flash Current
A typical write protocol consist of the following: first a
burst of EN/SET rising edges that identify/target a
particular address followed by EN/SET being held
logic high for the TLAT timeout period to latch the
address value in the registers, then another burst of
rising edges that signify data with the accompanying
TLAT timeout period to latch the data value in the reg-
isters. Once an address is set, then multiple writes
to the corresponding data register are allowed with-
out having to write to the address for every change
in data values. When EN/SET is held low longer
than TOFF (500µs), the AAT2830/31 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.
Flash Channel Control
Flash Timer
Red Color
Green Color
Blue Color
RGB Intensity
RGB Mode
RGB Current
Not Applicable
9
10
11
12
15
2
Table 1b: AS Cwire Serial Interface Addressing
with Independent Channel Control Enabled.
2
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-
Backlight Current Control (Addresses 0-2)
2
tains the AS Cwire serial interface address function-
The six channel backlight inputs, BL1-BL6, can
drive six individual LEDs to a maximum current of
ality when independent channel control is enabled.
2
30mA per channel. The EN/SET AS Cwire serial
EN/SET
Rising
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 5). 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.
Address Edges
Function
0
1
17
18
Backlight Current BL1-BL6
Main Backlight Current
BL1-BL4
2
3
4
5
6
7
8
9
10
11
12
15
19
20
21
22
23
24
25
26
27
28
29
32
Sub Backlight Current BL5-BL6
Low Backlight Current
Flash Current
Flash Channel Control
Flash Timer
Red Color
Green Color
Blue Color
RGB Intensity
RGB Mode
RGB Current
Backlight Independent
Channel Control
2
Table 1a: AS Cwire Serial Interface Addressing
with Independent Channel Control Disabled.
10
2830.2007.09.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
