參數(shù)資料
型號(hào)： LP5520
廠(chǎng)商： National Semiconductor Corporation
元件分類(lèi)： LED驅(qū)動(dòng)器
英文描述： RGB Backlight LED Driver
中文描述： RGB背光LED驅(qū)動(dòng)器
文件頁(yè)數(shù)： 24/34頁(yè)
文件大?。?/td> 790K
代理商： LP5520
I
2
C Compatible Interface
I
2
C SIGNALS
The serial interface is in I
2
C mode when IF_SEL = 0. The SCL
pin is used for the I
2
C clock and the SDA pin is used for bidi-
rectional data transfer. Both these signals need a pull-up
resistor according to I
2
C specification. The values of the pull-
up resistors are determined by the capacitance of the bus
(typical resistance is 1.8k). Signal timing specifications are
shown in table I
2
C Timing Parameters.
I
2
C DATA VALIDITY
The data on SDA line must be stable during the HIGH period
of the clock signal (SCL). In other words, state of the data line
can only be changed when CLK is LOW.
20186149
I
2
C Signals: Data Validity
I
2
C START AND STOP CONDITIONS
START and STOP bits classify the beginning and the end of
the I
2
C session. START condition is defined as SDA signal
transitioning from HIGH to LOW while SCL line is HIGH.
STOP condition is defined as the SDA transitioning from LOW
to HIGH while SCL is HIGH. The I
2
C master always generates
START and STOP bits. The I
2
C bus is considered to be busy
after START condition and free after STOP condition. During
data transmission, I
2
C master can generate repeated START
conditions. First START and repeated START conditions are
equivalent, function-wise.
20186150
I
2
C Start and Stop Conditions
TRANSFERRING DATA
Every byte put on the SDA line must be eight bits long, with
the most significant bit (MSB) being transferred first. Each
byte of data has to be followed by an acknowledge bit. The
acknowledge related clock pulse is generated by the master.
The transmitter releases the SDA line (HIGH) during the ac-
knowledge clock pulse. The receiver must pull down the SDA
line during the 9
th
clock pulse, signifying an acknowledge. A
receiver which has been addressed must generate an ac-
knowledge after each byte has been received.
After the START condition, the I
2
C master sends a chip ad-
dress. This address is seven bits long followed by an eighth
bit which is a data direction bit (R/W).
The LP5520 address
is 20h when SI=0 and 21h when SI=1.
For the eighth bit, a
“0” indicates a WRITE and a “1” indicates a READ. The sec-
ond byte selects the register to which the data will be written.
The third byte contains data to write to the selected register.
20186151
I
2
C Chip Address
20186136
w = write (SDA = “0”)
r = read (SDA = “1”)
ack = acknowledge (SDA pulled down by either master or slave)
rs = repeated start
id = 7-bit chip address, 20h when SI=0 and 21h when SI=1 for LP5520.
I
2
C Write Cycle
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相關(guān)PDF資料
PDF描述
LP5520TL RGB Backlight LED Driver
LP5520TLX RGB Backlight LED Driver
LP5521 Programmable Three Channel LED Driver
LP5521TM Programmable Three Channel LED Driver
LP5521TMX Programmable Three Channel LED Driver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP5520TL 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:RGB Backlight LED Driver
LP5520TL/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
LP5520TLX 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:RGB Backlight LED Driver
LP5520TLX/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
LP5521 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Programmable Three Channel LED Driver
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