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LP55281TL/NOPB データシート(PDF) 18 Page - Texas Instruments

部品番号 LP55281TL/NOPB
部品情報  LP55281 12-Channel RGB/White-LED Drive With SPI, I2C Interface
PDF  42 Pages
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メーカー  TI2 [Texas Instruments]
ホームページ  https://www.ti.com
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LP55281TL/NOPB データシート(HTML) 18 Page - Texas Instruments

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15k
ASE2
ADC
GAIN_SEL[2:0]
EN_AGC
PEAK
DETECTOR
ALED
CONTROL
HOLD
SPEED_CTRL[1:0]
THRESHOLD[3:0]
ASE1
15k
Threshold
&
AGC
18
LP55281
SNVS458D – JUNE 2007 – REVISED OCTOBER 2016
www.ti.com
Product Folder Links: LP55281
Submit Documentation Feedback
Copyright © 2007–2016, Texas Instruments Incorporated
Figure 13. ALED Audio Synchronization
7.3.3.1 Control of Audio Synchronization
Table 4 describes the controls required for audio synchronization. ALED brightness control through serial
interface is not available when audio synchronization is enabled.
Table 4. Audio Synchronization Control (Registers 0Dh And 0Eh)
NAME
BIT
DESCRIPTION
GAIN_SEL[2:0]
Register 0Dh
Bits 7-5
Input signal gain control. Gain has a range from 0 dB to -46 dB.
[000] = 0 dB, [001] = –6 dB, [010] = –12 dB, [011] = –18 dB,
[100] = -24 dB, [101] = -31 dB, [110] = -37 dB, [111] = –46 dB
DC_FREQ
Register 0Dh
Bit 4
Control of the high-pass filter's corner frequency:
0 = 80 Hz
1 = 510 Hz
EN_AGC
Register 0Dh
Bits 3
Automatic gain control. Set EN_AGC = 1 to enable automatic control or 0 to
disable. When EN_AGC is disabled, the audio input signal gain value is defined by
GAIN_SEL.
EN_SYNC
Register 0Dh
Bits 2
Audio synchronization enabled. Set EN_SYNC = 1 to enable audio
synchronization or 0 to disable.
SPEED_CTRL[1:0]
Register 0Dh
Bits 1-0
Control for refreshing frequency. Sets the typical refreshing rate for the ALED
output
[00] = FASTEST, [01] = 15 Hz, [10] = 7.6 Hz, [11] = 3.8 Hz
THRESHOLD[3:0]
Register 0Eh
Bits 3-0
Control for the audio input threshold. Sets the typical threshold for the audio inputs
signals. May be needed if there is noise on the audio lines.
Table 5. Audio Input Threshold Setting (Register 0Eh)
THRESHOLD[3:0]
THRESHOLD LEVEL (mV, typical)
0000
Disabled
0001
0.2
0010
0.4
...
...
1110
2.5
1111
2.7



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