Datasheet

Product data sheet Rev. 05 — 15 September 2008 5 of 31

NXP Semiconductors

PCA9535; PCA9535C

16-bit I

C-bus and SMBus, low power I/O port with interrupt

5.2 Pin description

[1] HVQFN24 and HWQFN24 package die supply ground is connected to both the V

pin and the exposed

center pad. The V

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.

[2] PCA9535 I/Os are totem pole, whereas the I/Os on PCA9535C are open-drain.

Table 3. Pin description

Symbol Pin Description

SO24, 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

[2]

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

12 9

[1]

supply ground

IO1_0 13 10 port 1 input/output

[2]

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

24 21 supply voltage