Datasheet
PCA9535A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 1 — 11 September 2012 4 of 38
NXP Semiconductors
PCA9535A
Low-voltage 16-bit I
2
C-bus I/O port with interrupt
5.2 Pin description
[1] HWQFN24 package die supply ground is connected to both V
SS
pin and exposed center pad. V
SS
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] Pins P0_0 to P0_7 correspond to bits P0.0 to P0.7. At power-up, all I/O are configured as high-impedance
inputs.
[3] Pins P1_0 to P1_7 correspond to bits P1.0 to P1.7. At power-up, all I/O are configured as high-impedance
inputs.
Table 3. Pin description
Symbol Pin Type Description
TSSOP24 HWQFN24
INT
1 22 O Interrupt output. Connect to V
DD
through a
pull-up resistor.
A1 2 23 I Address input 1. Connect directly to V
DD
or V
SS
.
A2 3 24 I Address input 2. Connect directly to V
DD
or V
SS
.
P0_0
[2]
4 1 I/O Port 0 input/output 0.
P0_1
[2]
5 2 I/O Port 0 input/output 1.
P0_2
[2]
6 3 I/O Port 0 input/output 2.
P0_3
[2]
7 4 I/O Port 0 input/output 3.
P0_4
[2]
8 5 I/O Port 0 input/output 4.
P0_5
[2]
9 6 I/O Port 0 input/output 5.
P0_6
[2]
10 7 I/O Port 0 input/output 6.
P0_7
[2]
11 8 I/O Port 0 input/output 7.
V
SS
12 9
[1]
power Ground.
P1_0
[3]
13 10 I/O Port 1 input/output 0.
P1_1
[3]
14 11 I/O Port 1 input/output 1.
P1_2
[3]
15 12 I/O Port 1 input/output 2.
P1_3
[3]
16 13 I/O Port 1 input/output 3.
P1_4
[3]
17 14 I/O Port 1 input/output 4.
P1_5
[3]
18 15 I/O Port 1 input/output 5.
P1_6
[3]
19 16 I/O Port 1 input/output 6.
P1_7
[3]
20 17 I/O Port 1 input/output 7.
A0 21 18 I Address input 0. Connect directly to V
DD
or V
SS
.
SCL 22 19 I Serial clock bus. Connect to V
DD
through a
pull-up resistor.
SDA 23 20 I/O Serial data bus. Connect to V
DD
through a
pull-up resistor.
V
DD
24 21 power Supply voltage.