PCA9544A

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© NXP Semiconductors N.V. 2014. All rights reserved.

Product data sheet

Rev. 5 — 23 April 2014

5 of 31

NXP Semiconductors

PCA9544A

4-channel I2C-bus multiplexer with interrupt logic

5.2 Pin description

[1]

HVQFN20 package supply ground is connected to both VSS pin and exposed center pad. VSS pin must be

connected to supply ground for proper device operation. For enhanced thermal, electrical, and board level

performance, the exposed pad must be soldered to the board using a corresponding thermal pad on the

board and for proper heat conduction through the board, thermal vias must be incorporated in the PCB in

the thermal pad region.

Table 3.

Pin description

Symbol

Pin

Description

SO20, TSSOP20

HVQFN20

A0

1

19

address input 0

A1

2

20

address input 1

A2

3

1

address input 2

INT0

4

2

active LOW interrupt input 0

SD0

5

3

serial data 0

SC0

6

4

serial clock 0

INT1

7

5

active LOW interrupt input 1

SD1

8

6

serial data 1

SC1

9

7

serial clock 1

VSS

10

8[1]

supply ground

INT2

11

9

active LOW interrupt input 2

SD2

12

10

serial data 2

SC2

13

11

serial clock 2

INT3

14

12

active LOW interrupt input 3

SD3

15

13

serial data 3

SC3

16

14

serial clock 3

INT

17

15

active LOW interrupt output

SCL

18

16

serial clock line

SDA

19

17

serial data line

VDD

20

18

supply voltage