MCP23018/MCP23S18
1.1
Pin Descriptions
2
TABLE 1-1:
I C PINOUT DESCRIPTION (MCP23018)
28L
PDIP/
SOIC
Pin
Name
24L
24L
Pin
Standard Function
QFN SSOP Type
GPB0
GPB1
GPB2
GPB3
GPB4
GPB5
GPB6
GPB7
3
24
1
2
3
4
5
6
7
8
9
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
4
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
5
2
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
6
3
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
7
4
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
8
5
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
9
6
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
10
7
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
VDD
11
1
8
10
1
P
P
I
Power
VSS
23
9
Ground
SCL
12
13
15
16
18
11
12
13
14
15
Serial clock input
SDA
10
11
12
13
I/O Serial data I/O
ADDR
RESET
INTB
I
I
Hardware address pin allows up to 8 slave devices on the bus
Hardware reset
O
Interrupt output for port B. Can be configured as active high, active low, or
open drain.
INTA
GPA0
GPA1
GPA2
GPA3
GPA4
GPA5
GPA6
GPA7
NC
19
20
21
22
23
24
25
26
27
14
15
16
17
18
19
20
21
22
—
16
17
18
19
20
21
22
23
24
—
—
O
Interrupt output for port A. Can be configured as active high, active low, or
open drain.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
I/O Bidirectional I/O Pin (5.5 volt tolerant inputs; open-drain outputs). Can be
enabled for interrupt on change, and/or internal pull-up resistor.
2, 14,
17, 28
Not connected
EP
—
25
Exposed Thermal Pad (EP). Do not electrically connect, or connect to VSS.
© 2008 Microchip Technology Inc.
DS22103A-page 5
MICROCHIP [ MICROCHIP ]
