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Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics
44/136
LGE Property
3.10. LCD back-light illumination
Figure 12 LCD Back light unit and Flash LED charge pump IC
The AAT3169 is a write-only single wire interface. It provides access to up to 32 registers that control device
functionality.In this system, two sets of pulse trains are transmitted via the SPIF pin. The first pulse set is used to
set the desired address. After the bus is held high for the address hold period, the next pulse set is used to write
the data value. After the data pulses are transmitted the bus is held high again for the data hold period to
signify the data write is complete. At this point the slave device latches the data into the address that was
selected by the first set of pulses. The protocol for using this interface is described in the following subsection.
Figure 13 I2C Serial data port control method
GS290 Operational Description Revision B
LG Electronics
44/136
LGE Property
3.10. LCD back-light illumination
Figure 12 LCD Back light unit and Flash LED charge pump IC
The AAT3169 is a write-only single wire interface. It provides access to up to 32 registers that control device
functionality.In this system, two sets of pulse trains are transmitted via the SPIF pin. The first pulse set is used to
set the desired address. After the bus is held high for the address hold period, the next pulse set is used to write
the data value. After the data pulses are transmitted the bus is held high again for the data hold period to
signify the data write is complete. At this point the slave device latches the data into the address that was
selected by the first set of pulses. The protocol for using this interface is described in the following subsection.
Figure 13 I2C Serial data port control method
VBAT
C403
1u
AAT3169IFO-T1
U401
2
15
1
10
14
13
3
12
11
9
6
8
5
7
4
C1+
C2+
C1-
C2-
OUTCP
IN
D1
D2
EN_SET
D3
D4
GND
D5
PGND
D6
C406
1u
K0
01
80
4
R
1u
C408
C417
1u
LCD_BACKLIGHT_EN
MLED
MLED5
MLED4
MLED3
MLED2
MLED1
LCD Backlight