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LP8556 数据表(PDF) 38 Page - Texas Instruments

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部件名 LP8556
功能描述  High-Efficiency LED Backlight Driver for Tablets
PDF  63 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LP8556 数据表(HTML) 38 Page - Texas Instruments

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LP8556
SNVS871I – JULY 2012 – REVISED MARCH 2016
www.ti.com
Product Folder Links: LP8556
Submit Documentation Feedback
Copyright © 2012–2016, Texas Instruments Incorporated
8.6.2.6 CFG0
Address A0h
CFG0 REGISTER
7
6
5
4
3
2
1
0
CURRENT LSB[7:0]
NAME
BIT
ACCESS
DESCRIPTION
CURRENT LSB
7:0
R/W
The 8-bits in this register (LSB) along the 4-bits defined in CFG1 Register (MSB) allow
LED current to be set in 12-bit fine steps. These 12-bits further scale the maximum LED
current set using CFG1 Register, CURRENT_MAX bits (denoted as IMAX ). If ISET_EN =
0, the LED current is defined with the bits as shown below. If ISET_EN = 1, then the
external resistor connected to the ISET pin scales the LED current as shown below.
ISET_EN = 0
ISET_EN = 1
0000 0000 0000
0A
0A
0000 0000 0001
(1/4095) ×
IMAX
(1/4095) × IMAX × 20,000 × 1.2V
/ RISET
0000 0000 0010
(2/4095) ×
IMAX
(2/4095) x IMAX × 20,000 × 1.2V
/ RISET
...
...
...
0111 1111 1111
(2047/4095)
× IMAX
(2047/4095) × IMAX × 20,000 ×
1.2V / RISET
...
...
...
1111 1111 1101
(4093/4095)
× IMAX
(4093/4095) × IMAX × 20,000 ×
1.2V / RISET
1111 1111 1110
(4094/4095)
× IMAX
(4094/4095) × IMAX × 20,000 x
1.2V / RISET
1111 1111 1111
(4095/4095)
× IMAX
(4095/4095) × IMAX × 20,000 x
1.2V / RISET
8.6.2.7 CFG1
Address A1h
CFG1 REGISTER
7
6
5
4
3
2
1
0
PDET_STDBY
CURRENT_MAX[2:0]
CURRENT MSB[11:8]
NAME
BIT
ACCESS
DESCRIPTION
PDET_STDBY
7
R/W
Enable Standby when PWM input is constant low (approx. 50 ms timeout).
CURRENT_MAX
6:4
R/W
Set Maximum LED current as shown below. This maximum current is scaled as
described in the CFG0 Register.
000 = 5 mA
001 = 10 mA
010 = 15 mA
011 = 20 mA
100 = 23 mA
101 = 25 mA
110 = 30 mA
111 = 50 mA
CURRENT MSB
3:0
R/W
These bits form the 4 MSB bits for LED Current as described in CFG0 Register.



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