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PCA9543

2-channel I2C switch with interrupt logic and reset

Philips Electronics 

Philips Semiconductors

2-channel I2C switch with interrupt logic and reset

Product data sheet

PCA9543

FEATURES

• 1-of-2 bi-directional translating switches

• I2C interface logic; compatible with SMBus standards

• 2 Active LOW Interrupt Inputs

• Active LOW Interrupt Output

• Active LOW Reset Input

• 2 address pins allowing up to 4 devices on the I2C-bus

• Channel selection via I2C-bus, in any combination

• Power up with all switch channels deselected

• Low RdsON 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 stand-by current

• Operating power supply voltage range of 2.3 V to 5.5 V

• 5 V tolerant Inputs

• 0 kHz to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

150 V MM per JESD22-A115 and 1000 V per JESD22-C101

• Latchup testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Packages offered: SO14, TSSOP14

DESCRIPTION

The PCA9543 is a bi-directional translating switch, controlled by the

I2C-bus. The SCL/SDA upstream pair fans out to two downstream

pairs, or channels. Any individual SCx/SDx channels or combination

of channels can be selected, determined by the contents of the

programmable control register. Two interrupt inputs, INT0 to INT3,

one for each of the downstream pairs, are provided. One interrupt

output INT, which acts as an AND of the two interrupt inputs, is

provided.

An active-LOW reset input allows the PCA9543 to recover from a

situation where one of the downstream I2C-buses is stuck in a LOW

state. Pulling the RESET pin 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 VDD

pin can be used to limit the maximum high voltage which will be

passed by the PCA9543. This allows the use of different bus

voltages on each SCx/SDx 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 pull-up resistors pull the bus up to the desired voltage level

for each channel. All I/O pins are 5 V tolerant.

PIN CONFIGURATION

A0 1

A1 2

RESET 3

INT0 4

SD0 5

SC0 6

VSS 7

14 VDD

13 SDA

12 SCL

11 INT

10 SC1

9 SD1

8 INT1

SW00803

Figure 1. Pin configuration

PIN DESCRIPTION

PIN

NUMBER

SYMBOL

1

A0

2

A1

3

RESET

4

INT0

5

SD0

6

SC0

7

VSS

8

INT1

9

SD1

10

SC1

11

INT

12

SCL

13

SDA

14

VDD

FUNCTION

Address input 0

Address input 1

Active LOW reset input

Interrupt input 0

Serial data 0

Serial clock 0

Supply ground

Interrupt input 1

Serial data 1

Serial clock 1

Interrupt output

Serial clock line

Serial data line

Supply voltage

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

14-Pin Plastic SO

–40 °C to +85 °C

PCA9543D

SOT108-1

14-Pin Plastic TSSOP

–40 °C to +85 °C

PCA9543PW

Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.

SOT402-1

2004 Oct 01

2

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