參數(shù)資料
型號(hào)： PCA9551D
廠商： NXP Semiconductors N.V.
元件分類： LED驅(qū)動(dòng)器
英文描述： 8-bit I2C-bus LED driver with programmable blink rates
封裝： PCA9551BS<SOT629-1 (HVQFN16)|<<http://www.nxp.com/packages/SOT629-1.html<1<Always Pb-free,;PCA9551D<SOT109-1 (SO16)|<<http://www.nxp.com/packages/SOT109-1.html<1<we
文件頁(yè)數(shù)： 1/26頁(yè)
文件大?。?/td> 155K
代理商： PCA9551D
1.
General description
The PCA9551 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is
necessary to limit bus trafc or free up the I2C-bus master's (MCU, MPU, DSP, chip set,
etc.) timer. The uniqueness of this device is the internal oscillator with two programmable
blink rates. To blink LEDs using normal I/O expanders like the PCF8574 or PCA9554, the
bus master must send repeated commands to turn the LED on and off. This greatly
increases the amount of trafc on the I2C-bus and uses up one of the master's timers.
The PCA9551 LED blinker instead requires only the initial set-up command to program
BLINK RATE 1 and BLINK RATE 2 (i.e., the frequency and duty cycle) for each individual
output. From then on, only one command from the bus master is required to turn each
individual open-drain output on, off, or to cycle at BLINK RATE 1 or BLINK RATE 2.
Maximum output sink current is 25 mA per bit and 100 mA per package.
Any bits not used for controlling the LEDs can be used for General Purpose parallel
Input/Output (GPIO) expansion.
The active LOW hardware reset pin (RESET) and Power-On Reset (POR) initializes the
registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).
Three hardware address pins on the PCA9551 allow eight devices to operate on the same
bus.
The newer Fast-mode Plus PCA9634 8-bit LED controller offers an individual PWM
dimming control for each channel for better color mixing capabilities with a global PWM for
dimming or blinking all channels at the same time. There are 126 possible address
combinations and the maximum output sink current is 25 mA per bit and 200 mA per
package.
2.
Features
I 8 LED drivers (on, off, ashing at a programmable rate)
I 2 selectable, fully programmable blink rates (frequency and duty cycle) between
0.148 Hz and 38 Hz (6.74 seconds and 0.026 seconds)
I Input/outputs not used as LED drivers can be used as regular GPIOs
I Internal oscillator requires no external components
I I2C-bus interface logic compatible with SMBus
I Internal power-on reset
I Noise lter on SCL/SDA inputs
I Active LOW reset input
I 8 open-drain outputs directly drive LEDs to 25 mA
I Edge rate control on outputs
PCA9551
8-bit I2C-bus LED driver with programmable blink rates
Rev. 08 — 31 July 2008
Product data sheet
相關(guān)PDF資料
PDF描述
PCA9551PW 8-bit I2C-bus LED driver with programmable blink rates
PCA9552BS 16-bit I2C-bus LED driver with programmable blink rates
PCA9552D 16-bit I2C-bus LED driver with programmable blink rates
PCA9552PW 16-bit I2C-bus LED driver with programmable blink rates
PCA9553D 4-bit I2C-bus LED driver with programmable blink rates
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9551D,112 功能描述:LED照明驅(qū)動(dòng)器 I2C LED BLINKER 8BIT 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
PCA9551D,118 功能描述:LED照明驅(qū)動(dòng)器 8-BIT I2C FM OD LED BLK RST 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
PCA9551D-T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit I2C-bus LED driver with programmable blink rates
PCA9551PW 功能描述:LED照明驅(qū)動(dòng)器 I2C LED BLINKER 8BIT 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
PCA9551PW,112 功能描述:LED照明驅(qū)動(dòng)器 I2C LED BLINKER 8BIT 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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