參數(shù)資料
型號(hào)： LP39542RL
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.6 to 5.0; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD
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)： 29/58頁(yè)
文件大?。?/td> 2547K
代理商： LP39542RL
Ambient Light and Temperature Measurement with LP39542
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] in register 2AH as seen on the
following table. Internal averaging function can be used to fil-
ter unwanted noise from the measured signal. Averaging
function can be enabled with EN_AVG bit in register 2BH.
INPUT_SEL[1:0]
Mode
00
Audio synchronization
Temperature measurement
(voltage input)
Ambient light measurement
(current input)
11
No input
01
10
EN_AVG = 0
Averaging disabled. f
sample
= 122 Hz,
data in register changes every 8.2 ms.
Averaging enabled. f
sample
= 244 Hz,
averaging of 64 samples, data in
register changes every 262 ms
(3.2Hz).
EN_AVG = 1
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 into a digital word. User can read the ADC output from
the ADC output register. The known ambient light condition
allows user to set the backlight current to optimal level thus
saving power especially in low light and bright sunlight con-
dition.
ASE Input Configuration for Light Measurement
30008564
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 into a digital word.
User can read the ADC output from register. The known tem-
perature 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
lifetime of LEDs in some applications.
30008542
Temperature sensor connection example
29
www.national.com
L
相關(guān)PDF資料
PDF描述
LP39542RLX Zener Diode; Application: Low noise; Pd (mW): 250; Vz (V): 4.9 to 5.3; Condition Iz at Vz (mA): 0.5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: LLD
LP39542TL Advanced Lighting Management Unit
LP39542TLX Advanced Lighting Management Unit
LP3954 Advanced Lighting Management Unit
LP3954RL Advanced Lighting Management Unit
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP39542RL/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
LP39542RLX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542RLX/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
LP39542TL 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced Lighting Management Unit
LP39542TL/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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*