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LP8555 Datasheet(PDF) 33 Page - Texas Instruments

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Part # LP8555
Description  LP8555 High-Efficiency LED Backlight Driver for Tablet PCs
PDF  64 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8555 Datasheet(HTML) 33 Page - Texas Instruments

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LP8555
www.ti.com
SNVS857 – FEBRUARY 2014
8.5.3 BRTLO
Address: 0x03
D7
D6
D5
D4
D3
D2
D1
D0
BRT[3:0]
RESERVED
Bits
Field
Type
Description
7:4
BRT[3:0]
R/W
Least significant bits of the brightness level.
3:0
reserved
R/O
8.5.4 BTHI
Address: 0x04
D7
D6
D5
D4
D3
D2
D1
D0
BRT[11:4]
Bits
Field
Type
Description
7:0
BRT[11:4]
R/W
Most significant bits of the brightness level.
The brightness level can be updated with 8-bit precision or 12-bit precision. To make brightness level updates
effective the internal brightness level is only updated when the BRTHI register is written. If the BRTHI register is
written without a previous write to the BRTLO register, then the lower 4 bits of the internal 12-bit brightness will
be synthesized from the BRTHI register value.
BRTLO
BRTHI
Brightness
Comments
write 0x95
write 0xFC
0xFC9
BRTLO[3:0] is ignored
write 0x10
write 0xDC
0xDC1
set to an exact 12-bit value
no write
write 0x8C
0x8C8
synthesize low order bits
no write
write 0x0C
0x0C0
synthesize low order bits
no write
write 0x00
0x000
0% brightness
no write
write 0xFF
0xFFF
100% brightness
Copyright © 2014, Texas Instruments Incorporated
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