Datasheet

PCA9539_PCA9539R All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 8 — 26 November 2014 6 of 38
NXP Semiconductors
PCA9539; PCA9539R
16-bit I
2
C-bus and SMBus low power I/O port with interrupt and reset
5.2 Pin description
[1] HVQFN24 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.
Table 3. Pin description
Symbol Pin Description
SO24, TSSOP24 HVQFN24
INT
1 22 interrupt output (open-drain)
A1 2 23 address input 1
RESET
3 24 active LOW reset input. Driving this pin LOW
causes:
• PCA9539 to reset its state machine and
registers
• PCA9539R to reset its state machine, but
has no effect on its registers
IO0_0 4 1 port 0 input/output 0
IO0_1 5 2 port 0 input/output 1
IO0_2 6 3 port 0 input/output 2
IO0_3 7 4 port 0 input/output 3
IO0_4 8 5 port 0 input/output 4
IO0_5 9 6 port 0 input/output 5
IO0_6 10 7 port 0 input/output 6
IO0_7 11 8 port 0 input/output 7
V
SS
12 9
[1]
supply ground
IO1_0 13 10 port 1 input/output 0
IO1_1 14 11 port 1 input/output 1
IO1_2 15 12 port 1 input/output 2
IO1_3 16 13 port 1 input/output 3
IO1_4 17 14 port 1 input/output 4
IO1_5 18 15 port 1 input/output 5
IO1_6 19 16 port 1 input/output 6
IO1_7 20 17 port 1 input/output 7
A0 21 18 address input 0
SCL 22 19 serial clock line input
SDA 23 20 serial data line open-drain input/output
V
DD
24 21 supply voltage