Datasheet

MCP23009/MCP23S09
DS22121B-page 4 © 2009 Microchip Technology Inc.
1.1 Pin Descriptions
TABLE 1-1: I
2
C PINOUT DESCRIPTION (MCP23009)
Pin
Name
18LD
PDIP/
SOIC
16LD
QFN
20LD
SSOP
Pin
Type
Standard Function
V
DD 131PPower
VSS 18 1 20 P Ground
SCL 3 4 3 I Serial clock input
SDA 4 5 4 I/O Serial data I/O
ADDR 5 6 5 I Hardware address pin allows up to 8 slave devices on the bus
RESET 6 7 6 I Hardware reset
INT 7 8 7 O Interrupt output for port. Can be configured as active high, active low,
or open-drain.
GP0 8 9 8 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.
GP1 9 10 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.
GP2 10 11 12 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.
GP3 11 12 13 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.
GP4 12 13 14 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.
GP5 13 14 15 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.
GP6 14 15 16 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.
GP7 15 16 17 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.
NC 2, 16,
17
22,10,
11,19,1
8
Not connected
EP — 17 Exposed Thermal Pad (EP). Do not electrically connect. Can connect
to V
SS.