參數(shù)資料
型號(hào)： LP3954RLX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動(dòng)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(yè)數(shù)： 27/56頁(yè)
文件大?。?/td> 5801K
代理商： LP3954RLX
Ambient Light and Temperature
Measurement with LP3954
The Analog-to-Digital converter (ADC) in the Audio Syn-
cronization block can be also used for ambient light measure-
ment or temperature measurement.
The selection between these modes is controlled with input
selector bits INPUT_SEL[1:0] as follows
INPUT_SEL[1:0]
00
Audio synchronization
Temperature measurement
(voltage input)
Ambient light measurement
(current input)
11
No input
Mode
01
10
AMBIENT LIGHT MEASUREMENT
The ambient light measurement requires only one external
component: Ambient light sensor (photo transistor or diode).
The ADC reads the current level at ASE pin and converts the
result in digital word. User can read the ADC output from the
ADC output register. The known ambient light condition al-
lows user to set the backlight current to optimal level thus
saving power especially in low light and bright sunlight con-
dition.
20132241
20132264
ADC Code vs Input Current
in light measurement mode
TEMPERATURE MEASUREMENT
The temperature measurement requires two external compo-
nents: resistor and thermistor (resistor that has known tem-
perature vs resistance curve). The ADC reads the voltage
level at ASE pin and converts the result in digital word. User
can read the ADC output from register. The known tempera-
ture allows for example to monitor the temperature inside the
display module and decrease the current level of the LEDs if
temperature raises too high. This function may increase life-
time of LEDs in some applications.
20132242
Temperature sensor connection example
20132263
ADC Code vs Input Voltage
in temperature measurement mode
27
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相關(guān)PDF資料
PDF描述
LP3954TL Advanced Lighting Management Unit
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LP3958TL Lighting Management Unit with High Voltage Boost Converter
LP3958TLX Lighting Management Unit with High Voltage Boost Converter
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3954RLX/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP3954TL 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP3954TL/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
LP3954TLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP3954TLX/NOPB 功能描述:LED照明驅(qū)動(dòng)器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N
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