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LP8556 Datasheet(PDF) 33 Page - Texas Instruments

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Part # LP8556
Description  High-Efficiency LED Backlight Driver for Tablets
PDF  52 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LP8556 Datasheet(HTML) 33 Page - Texas Instruments

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LP8556
www.ti.com
SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012
Table 9. EPROM Memory Map (continued)
ADD
REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
R
A3H
CFG3
RESERVED
SLOPE
FILTER
PWM_INPUT_HYSTERESIS
A4H
CFG4
PWM_TO_I_THRESHOLD
RESERVE STEADY_DIT
DITHER
D
HER
A5H
CFG5
PWM_DIREC
PS_MODE
PWM_FREQ
T
A6H
CFG6
BOOST_FREQ
VBOOST
A7H
CFG7
RESERVED
EN_DRV3
EN_DRV2
RESERVED
IBOOST_LIM
A8H
CFG8
RESERVED
RESERVED
RESERVED
RESERVED
A9H
CFG9
VBOOST_MAX
JUMP_EN
JUMP_THRESHOLD
JUMP_VOLTAGE
AAH
CFGA
SSCLK_EN
RESERV
RESERVED
ADAPTIV
DRIVER_HEADROOM
ED
E
ABH
CFGB
RESERVED
ACH
CFGC
RESERVED
RESERVED
ADH
CFGD
RESERVED
AEH
CFGE
STEP_UP
STEP_DN
LED_FAULT_TH
LED_COMP_HYST
AFH
CFGF
REVISION
Register Bit Explanations
BRIGHTNESS CONTROL
Address 00h
Reset value 0000 0000b
Brightness Control register
7
6
5
4
3
2
1
0
BRT[7:0]
Name
Bit
Access
Description
BRT
7:0
R/W
Backlight PWM 8-bit linear control.
DEVICE CONTROL
Address 01h
Reset value 0000 0000b
Device Control register
7
6
5
4
3
2
1
0
FAST
BRT_MODE[1:0]
BL_CTL
Name
Bit
Access
Description
FAST
7
Skip refresh of trim and configuration registers from EPROMs when exiting the low
power STANDBY mode.
0 = read EPROMs before returning to the ACTIVE state
1 = only read EPROMs once on initial power-up.
BRT_MODE
2:1
R/W
Brightness source mode Figure 20
00b = PWM input only
01b = PWM input and Brightness register (combined before shaper block)
10b = Brightness register only
11b = PWM input and Brightness register (combined after shaper block)
Copyright © 2012, Texas Instruments Incorporated
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