Low-voltage 16-bit I²C-bus GPIO with Agile I/O, interrupt and weak pull-up


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  • I²C-bus to parallel port expander
  • Operating power supply voltage range of 1.65 V to 5.5 V
  • Low standby current consumption
    • 1.5 μA (typical at 5 V VDD)
    • 1.0 μA (typical at 3.3 V VDD)
  • Schmitt-trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
    • Vhys = 0.10 x VDD (typical)
  • 5 V tolerant I/Os
  • Open-drain active LOW interrupt output (INT)
  • 400 kHz Fast-mode I²C-bus
  • Internal power-on reset
  • Power-up with all channels configured as inputs and weak pull-up resistors
  • No glitch on power-up
  • Latched outputs with 25 mA drive maximum capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA per JESD78, Class II
  • ESD protection exceeds JESD22
    • 2000 V Human Body Model (A114-A)
    • 1000 V Charged-Device Model (C101)
  • Packages offered: TSSOP24, HVQFN24
  • Agile I/O features

    • Pin to pin replacement for PCA9555 and PCA9555A with interrupts disabled at power-up
      • Software backward compatible with PCA9555 and PCA9555A
    • Output port configuration: bank selectable push-pull or open-drain output stages
    • Interrupt status: read-only register identifies the source of an interrupt
    • Bit-wise I/O programming features
      • Output drive strength: four programmable drive strengths to reduce rise and fall times in low capacitance applications
      • Input latch: Input Port register values changes are kept until the Input Port register is read
      • Pull-up/pull-down enable: floating input or pull-up/down resistor enable
      • Pull-up/pull-down selection: 100 kΩ pull-up/down resistor selection
      • Interrupt mask: mask prevents the generation of the interrupt when input changes state


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