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參數(shù)資料
| 型號： | PCA9550D |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | LED驅動器 |
| 英文描述： | 2-bit I2C-bus LED driver with programmable blink rates |
| 封裝： | PCA9550D<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005,;PCA9550D<SOT96-1 (SO8)|<<http://www.nxp.com/packages/SOT96-1.html<1<week 5, 2005,; |
| 文件頁數(shù)： | 1/26頁 |
| 文件大?。?/td> | 150K |
| 代理商： | PCA9550D |
1.
General description
The PCA9550 LED blinker blinks LEDs in I2C-bus and SMBus applications where it is
necessary to limit bus trafc or free up the I2C 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 PCA9550
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). 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 50 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).
One hardware address pin on the PCA9550 allows two devices to operate on the same
bus.
2.
Features
I 2 LED drivers (on, off, ashing at a programmable rate)
I 2 selectable, fully programmable blink rates (frequency and duty cycle) between
0.172 Hz and 44 Hz (5.82 seconds and 0.023 second)
I Input/output 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 2 open-drain outputs directly drive LEDs to 25 mA
I Controlled edge rates to minimize ground bounce
I No glitch on power-up
I Supports hot insertion
I Low standby current
I Operating power supply voltage range of 2.3 V to 5.5 V
I 0 kHz to 400 kHz clock frequency
PCA9550
2-bit I2C-bus LED driver with programmable blink rates
Rev. 05 — 13 October 2008
Product data sheet
相關PDF資料 |
PDF描述 |
|---|---|
| PCA9550DP | 2-bit I2C-bus LED driver with programmable blink rates |
| PCA9551BS | 8-bit I2C-bus LED driver with programmable blink rates |
| PCA9551D | 8-bit I2C-bus LED driver with programmable blink rates |
| PCA9551PW | 8-bit I2C-bus LED driver with programmable blink rates |
| PCA9552BS | 16-bit I2C-bus LED driver with programmable blink rates |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9550D,112 | 功能描述:LED照明驅動器 2-BIT I2C FM OD LED 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9550D,118 | 功能描述:LED照明驅動器 2-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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| PCA9550D112 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9550DP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2-bit I2C LED driver with programmable blink rates |
| PCA9550DP,118 | 功能描述:LED照明驅動器 2-BIT I2C FM OD LED 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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