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NCA9555B - 16-bit I2C-bus I/O port

General Description

7.1.

FUNCTIONAL BLOCK DIAGRAM 10 7.2.

7.2.1.

Key Features

  • I2C to Parallel Port Expander.
  • Operating power supply voltage range of 1.65 V to 5.5 V.
  • Low standby current.
  • Open-drain active-low interrupt output.
  • 5.5 V tolerant, 16 I/O ports which default to input mode.
  • Compatible with most microcontrollers.
  • Up to 400 kHz clock frequency.
  • Noise filter on SCL/SDA inputs.
  • Polarity Inversion register.
  • Internal power-on reset.
  • No glitch on power-up.
  • Address by three hardware address pins for use of up.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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NCA9555B 16-bit I2C-bus I/O port with interrupt Datasheet (EN) 1.1 Product Overview The NCA9555B is a 24-pin device that provides 16 bits of General Purpose parallel Input/Output (GPIO) expansion for the two-line bidirectional I2C bus applications. The device can operate with a power supply voltage (VDD) range from 1.65 V to 5.5 V. It provides a simple solution when additional I/Os are needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc. The NCA9555B consists of two 8-bit Configuration (Input or Output selection); Input, Output and Polarity Inversion (active HIGH or active LOW operation) registers. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits.