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LP5521 Datenblatt(PDF) 14 Page - Texas Instruments

Teilenummer LP5521
Bauteilbeschribung  LP5521 Three-Channel RGB, White-LED Driver With Internal Program Memory and Integrated Charge Pump
PDF  51 Pages
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Hersteller  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LP5521 Datenblatt(HTML) 14 Page - Texas Instruments

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background image
0
255
16
32
48
64
80
96 112 128 144 160 176 192 208 224 240
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
LOG_EN = 1
LOG_EN = 0
CONTROL (DEC)
0
14
LP5521
SNVS441I – JANUARY 2007 – REVISED NOVEMBER 2016
www.ti.com
Product Folder Links: LP5521
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
PWM frequency is either 256 Hz or 558 Hz, frequency is set with PWM_HF bit in register 08H. When PWM_HF
is 0, the frequency is 256 Hz, and when bit is 1, the PWM frequency is 558 Hz. Brightness adjustment is either
linear or logarithmic. This can be set with register 00H LOG_EN bit. When LOG_EN = 0 linear adjustment scale
is used, and when LOG_EN = 1 logarithmic scale is used. By using logarithmic scale the visual effect seems
linear to the eye. Register control bits are presented in Table 3, Table 4, and Table 5:
Table 3. R_CURRENT Register (05H), G_CURRENT register (06H), B_CURRENT register (07H):
NAME
BIT
DESCRIPTION
CURRENT
7:0
Current setting
bin
hex
dec
mA
0000 0000
0000 0001
0000 0010
0000 0011
0000 0100
0000 0101
0000 0110
...
1010 1111
...
1111 1011
1111 1100
1111 1101
1111 1110
1111 1111
00
01
02
03
04
05
06
...
AF
...
FB
FC
FD
FE
FF
0
1
2
3
4
5
6
...
175
...
251
252
253
254
255
0.0
0.1
0.2
0.3
0.4
0.5
0.6
...
17.5 (def)
...
25.1
25.2
25.3
25.4
25.5
Table 4. ENABLE Register (00H):
NAME
BIT
DESCRIPTION
LOG_EN
7
Logarithmic PWM adjustment enable bit
0 = Linear adjustment
1 = Logarithmic adjustment
Table 5. CONFIG Register (08H):
NAME
BIT
DESCRIPTION
PWM_HF
6
PWM clock frequency
0 = 256 Hz, frequency defined by the 32-kHz clock (internal or external)
1 = 558 Hz, frequency defined by internal oscillator
Figure 16. Logarithmic and Linear PWM Adjustment Curves



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