Datasheet

PCA9544A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 5 — 23 April 2014 5 of 31
NXP Semiconductors
PCA9544A
4-channel I
2
C-bus multiplexer with interrupt logic
5.2 Pin description
[1] HVQFN20 package 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 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
V
SS
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
V
DD
20 18 supply voltage