Datasheet

© 2009 Microchip Technology Inc. DS22121B-page 5
MCP23009/MCP23S09
TABLE 1-2: SPI PINOUT DESCRIPTION (MCP23S09)
Pin
Name
18LD
PDIP/
SOIC
16LD
QFN
Pin
Type
Standard Function
V
DD 1 3 P Power (high current capable)
V
SS 18 1 P Ground (high current capable)
CS
34IChip select
SCK 4 2 I Serial clock input
SI 5 5 I Serial data input
SO 6 6 O Serial data out
RESET 7 7 I Hardware reset (must be externally biased)
INT 8 8 O Interrupt output for port. Can be configured as active high, active low, or open-drain.
GP0 9 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.
GP1 10 10 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 11 11 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 12 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.
GP4 13 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.
GP5 14 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.
GP6 15 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.
GP7 16 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.
NC 2, 17 — Not connected
EP — 17 — Exposed Thermal Pad (EP). Do not electrically connect, Can connect to V
SS.