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Switch Control Logic
I
2
C Bus Control
Interrupt Logic
Input Filter
Power-on Reset
PCA9545A
SC0
A1
A0
INT
INT0
SDA
SCL
GND
SD3
SD2
SD1
SD0
SC3
SC2
SC1
9
13
16
5
8
12
15
6
10
20
3
19
18
4
17
2
1
7
11
14
INT1
INT2
INT3
Pin numbers shown are for DGV, DW, PW, and RGY packages.
Output
Filter
V
CC
RESET
PCA9545A
4-CHANNEL I
2
C AND SMBus SWITCH
WITH INTERRUPT LOGIC AND RESET FUNCTIONS
SCPS147C – OCTOBER 2005 – REVISED OCTOBER 2006
BLOCK DIAGRAM
4
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