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PA9544A - 4-channel I2C-bus multiplexer

General Description

The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I2C-bus.

The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels.

Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register.

Key Features

  • 1-of-4 bidirectional translating multiplexer.
  • I2C-bus interface logic; compatible with SMBus.
  • 4 active LOW interrupt inputs.
  • Active LOW interrupt output.
  • 3 address pins allowing up to 8 devices on the I2C-bus.
  • Channel selection via I2C-bus.
  • Power-up with all multiplexer channels deselected.
  • Low Ron switches.
  • Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses.
  • No glitch on power-up.
  • Supports hot insertion.
  • Low st.

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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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PCA9544A 4-channel I2C-bus multiplexer with interrupt logic Rev. 5 — 23 April 2014 Product data sheet 1. General description The PCA9544A is a 1-of-4 bidirectional translating multiplexer, controlled via the I2C-bus. The SCL/SDA upstream pair fans out to four SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the SCx/SDx downstream pairs, are provided. One interrupt output, INT, which acts as an AND of the four interrupt inputs, is provided. A power-on reset function puts the registers in their default state and initializes the I2C-bus state machine with no channels selected.