PRODUCT DATASHEET
AAT2860
TM
ChargePump
Backlight/Flash LED Driver and Multiple LDO Lighting Management Unit
D7
D6
MEQS2
FLOOR[0]
X3
D5
MAIN_ON
SUB_ON
X3
D4
WM[4]
WS[4]
X3
D3
WM[3]
WS[3]
X3
D2
WM[2]
WS[2]
X3
D1
WM[1]
D0
WM[0]
X3
FLOOR[1]
X3
REG2
REG3
REG5
WS[1]
WS[0]
NOFADE_M2
NOFADE_S2
Table 3: AAT2860 BL1-BLX Backlight Control Register Allocation.
WM[4:0], WS[4:0]
LED Current (mA)
WM[4:0], WS[4:0]
LED Current (mA)
000001
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
311
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
10000
10001
10010
10011
10100
10101
10110
10111
11000
11001
11010
11011
11100
11101
11110
11111
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0.5
Table 4: MAIN/SUB LED Current - WM/WS[4:0].
For each one of the three options in Table 6, setting/pro-
gramming the bits in REG4 (see Table 7) sets the full-
scale flash current, the torch current levels, and flash
safety time duration. The most-significant 4-bit nibble
(REG1[D7:D4], or F_HI[3:0]) of the 8-bit data word sets
the full-scale flash LED current, the middle two bits
(REG4[D3:D2], or F_TIME[1:0]) set the flash safety dura-
tion, and the last two bits (REG4[D1:D0], or F_LO[1:0])
are used to set the torch current level.
FLOOR[1:0]
Fade In/Out Current Level (mA)
001
01
10
11
0.48
0.97
1.94
2.90
Table 5: Main/Sub LED Current
Fade In/Out Level Control.
MEQS Bit (REG2 Data Bit[6])
Part
Number
“1” (Default)
“0”
AAT2860-2
AAT2860-3
AAT2860-4
6M+0S+1FL
6M+0S+1FL
5M+0S+2FL
4M+2S+1FL
5M+1S+1FL
4M+1S+2FL
Table 6: AAT2860-2/3/4 Flash Driver
Control Register Allocation.
1. Denotes default (power-on-reset) value.
2. Denotes default value is "1" or ON.
3. Don't Care or Reserved.
w w w . a n a l o g i c t e c h . c o m
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2860.2008.05.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
