PCA9555 datasheet(5/34 Pages) NXP

Part #	PCA9555

Description	16-bit I2C-bus and SMBus I/O port with interrupt

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Manufacturer	NXP [NXP Semiconductors]

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5 / 34 page

PCA9555_8

Product data sheet

Rev. 08 — 22 October 2009

5 of 34

NXP Semiconductors

PCA9555

16-bit I2C-bus and SMBus I/O port with interrupt

5.2 Pin description

[1]

HVQFN and HWQFN package die supply ground is connected to both the VSS pin and the exposed center

pad. The VSS pin must be connected to supply ground for proper device operation. For enhanced thermal,

electrical, and board-level performance, the exposed pad needs to be soldered to the board using a

corresponding thermal pad on the board, and for proper heat conduction through the board thermal vias

need to be incorporated in the PCB in the thermal pad region.

Table 3.

Pin description

Symbol

Description

DIP24, SO24,

SSOP24, TSSOP24

HVQFN24,

HWQFN24

INT

1

22

interrupt output (open-drain)

A1

2

23

address input 1

A2

3

24

address input 2

IO0_0

4

1

port 0 input/output

IO0_1

5

2

IO0_2

6

3

IO0_3

7

4

IO0_4

8

5

IO0_5

9

6

IO0_6

10

7

IO0_7

11

8

VSS

12

9[1]

supply ground

IO1_0

13

10

port 1 input/output

IO1_1

14

11

IO1_2

15

12

IO1_3

16

13

IO1_4

17

14

IO1_5

18

15

IO1_6

19

16

IO1_7

20

17

A0

21

18

address input 0

SCL

22

19

serial clock line

SDA

23

20

serial data line

VDD

24

21

supply voltage

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