PCA9543APWRG4 datasheet(2/20 Pages) TI

Part #	PCA9543APWRG4

Description	TWO-CHANNEL I2C-BUS SWITCH WITH INTERRUPT LOGIC AND RESET

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Manufacturer	TI [Texas Instruments]

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DESCRIPTION/ORDERING INFORMATION (CONTINUED)

PCA9543A

TWO-CHANNEL I2C-BUS SWITCH

WITH INTERRUPT LOGIC AND RESET

SCPS169 – SEPTEMBER 2007

An active-low reset (RESET) input allows the PCA9543A to recover from a situation where one of the

downstream I2C buses is stuck in a low state. Pulling RESET low resets the I2C state machine and causes all the

channels to be deselected, as does the internal power-on reset function.

The pass gates of the switches are constructed such that the VCC pin can be used to limit the maximum high

voltage, which will be passed by the PCA9543A. This allows the use of different bus voltages on each pair, so

that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External

pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5-V tolerant.

TERMINAL FUNCTIONS

D AND PW

NAME

DESCRIPTION

PIN NUMBER

1

A0

Address input 0. Connect directly to VCC or ground.

2

A1

Address input 1. Connect directly to VCC or ground.

3

RESET

Active-low reset input. Connect to VCC through a pullup resistor, if not used.

4

INT0

Active-low interrupt input 0. Connect to VCC through a pullup resistor.

5

SD0

Serial data 0. Connect to VCC through a pullup resistor.

6

SC0

Serial clock 0. Connect to VCC through a pullup resistor.

7

GND

Ground

8

INT1

Active-low interrupt input 1. Connect to VCC through a pullup resistor.

9

SD1

Serial data 1. Connect to VCC through a pullup resistor.

10

SC1

Serial clock 1. Connect to VCC through a pullup resistor.

11

INT

Active-low interrupt output. Connect to VCC through a pullup resistor.

12

SCL

Serial clock line. Connect to VCC through a pullup resistor.

13

SDA

Serial data line. Connect to VCC through a pullup resistor.

14

VCC

Supply power

2

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