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PCA9545ADW Datasheet(PDF) 10 Page - Texas Instruments

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Part # PCA9545ADW
Description  Interrupt Logic and Reset Functions
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PCA9545ADW Datasheet(HTML) 10 Page - Texas Instruments

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PCA9545A
SCPS147D – OCTOBER 2005 – REVISED JUNE 2014
www.ti.com
9 Detailed Description
9.1 Overview
The PCA9545A is a 4-channel, bidirectional translating I2C switch. The master SCL/SDA signal pair is directed to
four channels of slave devices, SC0/SD0-SC3/SD3. Any individual downstream channel can be selected as well
as any combination of the four channels. The PCA9545A also supports interrupt signals in order for the master to
detect an interrupt on the INT output terminal that can result from any of the slave devices connected to the
INT3-INT0 input terminals.
The device offers an active-low RESET input which resets the state machine and allows the PCA9545A to
recover should one of the downstream I2C buses get stuck in a low state. The state machine of the device can
also be reset by cycling the power supply, VCC, also known as a power-on reset (POR). Both the RESET function
and a POR will cause all channels to be deselected.
The connections of the I2C data path are controlled by the same I2C master device that is switched to
communicate with multiple I2C slaves. After the successful acknowledgment of the slave address (hardware
selectable by A0 and A1 terminals), a single 8-bit control register is written to or read from to determine the
selected channels and state of the interrupts.
The PCA9545A may also be used for voltage translation, allowing the use of different bus voltages on each
SCn/SDn pair such that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts. This is achieved by using
external pull-up resistors to pull the bus up to the desired voltage for the master and each slave channel.
10
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Product Folder Links: PCA9545A


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