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PCA9545A - 4-channel I2C switch

Description

The PCA9545A is a quad bidirectional translating switch controlled via the I2C-bus.

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

Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register.

Features

  • 1-of-4 bidirectional translating switches.
  • I2C-bus interface logic; compatible with SMBus standards.
  • Four active LOW interrupt inputs.
  • Active LOW interrupt output.
  • Active LOW reset input.
  • Two address pins allowing up to four devices on the I2C-bus.
  • Channel selection via I2C-bus, in any combination.
  • Power-up with all switch channels deselected.
  • Low Ron switches.
  • Allows voltage level translation between 1.8.

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Full PDF Text Transcription

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PCA9545A 4-channel I2C-bus switch with interrupt logic and reset Rev. 10 — 27 September 2022 Product data sheet 1 General description The PCA9545A is a quad bidirectional translating switch controlled via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCx/SDx channel or combination of channels can be selected, determined by the contents of the programmable control register. Four interrupt inputs, INT0 to INT3, one for each of the downstream pairs, are provided. One interrupt output, INT, acts as an AND of the four interrupt inputs. An active LOW reset input allows the PCA9545A to recover from a situation where one of the downstream I2C-buses is stuck in a LOW state.
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