PCA9551D,118

PCA9551D,118 is a 8bit I²C-bus LED driver with programmable blink rates. The uniqueness of this device is the internal oscillator with two programmable blink rates. To blink LEDs using normal I/O expanders like the PCA9554, the bus host must send repeated commands to turn the LED on and off. 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 host is required to turn each individual open-drain output on, off, or to cycle at BLINK RATE 1 or BLINK RATE 2. 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, active high) and Power-On Reset (POR) initializes the registers to their default state, all zeroes, causing the bits to be set HIGH (LED off).

• 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 inputs, 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
• Supply voltage range from 2.3 to 5.5V (Tamb = -40°C to +85°C)
• 1.7V typical power-on reset voltage (no load, VI = VDD or VSS, Tamb = -40°C to +85°C)
• SO16 package, operating ambient temperature from -40 to +85°C

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