PCA9545A_45B_45C All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 9 — 5 May 2014 5 of 32
NXP Semiconductors
PCA9545A/45B/45C
4-channel I
2
C-bus switch with interrupt logic and reset
5.2 Pin description
[1] HVQFN20 package die supply ground is connected to both the V
SS
pin and the exposed center pad. The
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
RESET
3 1 active LOW reset input
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
