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20
6 8 9 10
1
2
3
4
5
15
14
13
12
11
INT2
SD2
SD1
SC1
GND
19
A2
INT0
SD0
SC0
INT1
INT
SC3
SD3
INT3
SC2
RGW PACKAGE
(TOP VIEW)
18 17 16
7
SDA
SCL
A1
A0
V
CC
DGV, DW, OR PW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
A0
A1
A2
INT0
SD0
SC0
INT1
SD1
SC1
GND
V
CC
SDA
SCL
INT
SC3
SD3
INT3
SC2
SD2
INT2
RGY PACKAGE
(TOP VIEW)
2
A1
19
SDA
3
A2
18
SCL
4
INT0
17
INT
5
SD0
16
SC3
6
SC0
15
SD3
7
INT1
14
INT3
8
SD1
13
SC2
9
SC1
12
SD2
1
10
A0
GND
20
11
INT2
V
CC
GQN OR ZQN PACKAGE
(TOP VIEW)
1 2 3 4
A
B
C
D
E
PCA9544A
4-CHANNEL I
2
C AND SMBus MULTIPLEXER
WITH INTERRUPT LOGIC
SCPS146D – OCTOBER 2005 – REVISED FEBRUARY 2008
TERMINAL FUNCTIONS
PIN NO.
NAME FUNCTION
DGV, DW, PW,
RGW
AND RGY
1 19 A0 Address input 0. Connect directly to V
CC
or ground.
2 20 A1 Address input 1. Connect directly to V
CC
or ground.
3 1 A2 Address input 2. Connect directly to V
CC
or ground.
4 2 INT0 Active-low interrupt input 0. Connect to V
CC
through a pullup resistor.
5 3 SD0 Serial data 0. Connect to V
CC
through a pullup resistor.
6 4 SC0 Serial clock 0. Connect to V
CC
through a pullup resistor.
7 5 INT1 Active-low interrupt input 1. Connect to V
CC
through a pullup resistor.
8 6 SD1 Serial data 1. Connect to V
CC
through a pullup resistor.
9 7 SC1 Serial clock 1. Connect to V
CC
through a pullup resistor.
10 8 GND Ground
11 9 INT2 Active-low interrupt input 2. Connect to V
CC
through a pullup resistor.
12 10 SD2 Serial data 2. Connect to V
CC
through a pullup resistor.
13 11 SC2 Serial clock 2. Connect to V
CC
through a pullup resistor.
14 12 INT3 Active-low interrupt input 3. Connect to V
CC
through a pullup resistor.
15 13 SD3 Serial data 3. Connect to V
CC
through a pullup resistor.
16 14 SC3 Serial clock 3. Connect to V
CC
through a pullup resistor.
17 15 INT Active-low interrupt output. Connect to V
CC
through a pullup resistor.
18 16 SCL Serial clock line. Connect to V
CC
through a pullup resistor.
19 17 SDA Serial data line. Connect to V
CC
through a pullup resistor.
20 18 V
CC
Supply power
TERMINAL ASSIGNMENTS
1 2 3 4
A A1 A0 V
CC
SDA
B INT0 INT A2 SCL
C SC0 SD0 SD3 SC3
D SD1 SC2 INT1 INT3
E GND SC1 INT2 SD2
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