AAT2400 Datasheet, PDF (14/32 Pages) Skyworks Solutions Inc. – Sixteen-Channel White LED Driver Solution

DATA SHEET
AAT2400/2401
Sixteen-Channel White LED Driver Solution
with Full LED Current and Timing Control
Current Sink Control
Each current sink has an independent property pro-
grammed by the following registers. The AAT2400 con-
tains current sinks 1 through 8. The AAT2401 contains
current sinks 9 through 16.
Dot Correction
Each current sink can have a separate current setting to
compensate for relative LED brightness. This register
has a default setting of half scale.
and a 4-bit word. This register has a default setting of 0.
Only even register addresses are used. Starting from 80h,
every other even register is programmed up to BEh.
ADDR:
80h to BEh
Bit Bit Name
7:0 DLYn 7:0
DLYn LSB:
Delay Setting LSB
Default Access Description
00h
R/W
8 LSBs of 12-bit
GS word
Table 4: Delay Setting LSB.
ADDR:
00h to 1Eh
Bit Bit Name
7:0 DOTn 7:0
DOTn:
DOT Correction Current Setting
Default Access Description
7Fh
R/W
8-bit DOT word
Table 1: DOT Correction Current Setting.
Gray Scale
Each current sink has a unique PWM duty cycle setting to
provide a given brightness. The gray scale register is a
12-bit word divided into an 8-bit word and a 4-bit word.
This register has a default setting of ½ scale, or 0400h.
Only even register addresses are used starting from 40h
to 7Eh.
ADDR:
40h to 7Eh
Bit Bit Name
7:0 GSn 7:0
GSn LSB:
Gray Scale Setting LSB
Default Access
00h
R/W
Description
8 LSBs of 12-bit
GS word
Table 2: Gray Scale Setting LSB.
ADDR:
40h to 7Eh
GSn MSB:
Gray Scale Setting MSB
Bit Bit Name Default Access Description
3:0 GSn 11:8
04h
R/W
4 MSBs of 12-bit
GS word
Table 3: Gray Scale Setting MSB.
Delay
Each current sink has a unique delay time from the start
of V_SYNC to when the current sink PWM cycle begins. The
delay register is a 12-bit word divided into an 8-bit word
ADDR:
80h to BEh
Bit Bit Name
3:0 DLYn 11:8
DLYn MSB:
Delay Setting MSB
Default
00h
Access
R/W
Description
4 MSBs of 12-
bit GS word
Table 5: Delay Setting MSB.
Current Sink ON/OFF
Each current sink can be independently enabled or dis-
abled. In the event of an over temperature condition,
this register is reset to 00h and must be reprogrammed
to resume operation. It has a default setting of 00h (all
sinks are off).
ADDR: C0h
CTL1:
This Register Enables or
Disables Each Current Sink
Independently
Bit Bit Name Default Access Description
7:0
CS8:CS1
00h
R/W
0 = current
sink OFF, 1=
current sink ON
Table 6: CTL1 Setting.
ADDR: C2h
CTL2:
This Register Enables or
Disables Each Current Sink
Independently
Bit Bit Name Default Access
7:0 CS16:CS9
00h
R/W
Description
0 = current sink
OFF, 1= current
sink ON
Table 7: CTL2 Setting.
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202307A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 24, 2012