參數(shù)資料
型號: LP3954RLX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 顯示驅動器
英文描述: Advanced Lighting Management Unit
中文描述: LED DISPLAY DRIVER, PBGA36
封裝: 3 X 3 MM, 0.65 MM HEIGHT, 0.50 MM PITCH, MICRO, SMD-36
文件頁數(shù): 19/56頁
文件大?。?/td> 5801K
代理商: LP3954RLX
AUDIO SYNC ELECTRICAL PARAMETERS
Symbol
Z
IN
A
IN
Parameter
Input Impedance of ASE
Conditions
Min
250
0.1
Typical
500
Max
Units
kOhm
Audio Input Level Range
(peak-to-peak)
Gain = 21dB
Gain = 0 dB
V
V
DDA
-0.1
f
3dB
Crossover Frequencies (-3
dB)
Narrow Frequency
Response
kHz
Low Pass
Band Pass
High Pass
0.5
1.0 and 1.5
2.0
1.0
2.0 and 3.0
4.0
Wide Frequency Response Low Pass
Band Pass
High Pass
CONTROL OF AUDIO SYNCHRONIZATION
The following table describes the controls required for audio synchronization.
Audio_sync_CTRL1 (2AH)
GAIN_SEL[2:0]
Bits 7-5
Input signal gain control. Range 0...21 dB, step 3 dB:
[000] = 0 dB (default)
[001] = 3 dB
[010] = 6 dB
Synchronization mode selector.
SYNCMODE = 0
Amplitude Mode (default)
SYNCMODE = 1
Frequency Mode
Automatic Gain Control enable
1 = enabled
0 = disabled (Gain Select enabled) (default)
Audio synchronization enable
1 = Enabled
Note : If AGC is enabled, AGC gain starts from current GAIN_SEL gain value.
0 = Disabled (default)
[00] = Single ended input signal, ASE.
[01] = Temperature measurement
[10] = Ambient light measurement
[11] = No input (default)
Audio_sync_CTRL2 (2BH)
0 – average disabled (not applicable in audio synchronization mode)
1 – average enabled (not applicable in audio synchronization mode)
See below: Mode control
Sets the LEDs light response time to audio input.
[00] = FASTEST (default)
[01] = FAST
[10] = MEDIUM
[11] = SLOW
(For SLOW setting in amplitude mode f
MAX
=3.8Hz,
Frequency mode f
MAX
=7.6Hz)
[011] = 9 dB
[100] = 12 dB
[101] = 15 dB
[110] = 18 dB
[111] = 21 dB
SYNC_MODE
Bit 4
EN_AGC
Bit 3
EN_SYNC
Bit 2
INPUT_SEL[1:0]
Bits 1-0
EN_AVG
Bit 4
MODE_CTRL[1:0]
Bits 3-2
SPEED_CTRL[1:0]
Bits 1-0
19
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