PCA9551D,118 - 

Driver de LED, 8 Sorties, 2.3V-5.5V in, Découpage 400kHz, 100mA out, SOIC-16

NXP PCA9551D,118

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Aperçu du produit

The PCA9551D,118 is a 8-bit I²C-bus LED Driver with programmable blink rates. The LED blinker blinks LEDs in I²C-bus and SMBus applications where it is necessary to limit bus traffic or free up the I²C-bus masters (MCU, MPU, DSP, chip set) 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 traffic on the I²C-bus and uses up one of the masters 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.
  • 8 LED drivers (ON, OFF, flashing at a programmable rate)
  • Input/outputs not used as LED drivers can be used as regular GPIOs
  • Internal oscillator requires no external components
  • I²C-bus Interface logic compatible with SMBus
  • Internal power-ON reset
  • Noise filter on SCL/SDA input
  • Active low reset input
  • 8 Open-drain outputs directly drive LEDs to 25mA
  • Edge rate control on outputs
  • No glitch on power-up
  • Supports hot insertion
  • Low standby current consumption
  • Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA
  • 0Hz to 400kHz Clock frequency


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