MCP23018 datasheet(6/56 Pages) MICROCHIP

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MCP23018/MCP23S18

DS22103A-page 6

TABLE 1-2:

SPI PINOUT DESCRIPTION (MCP23S18)

Name

28L

PDIP/

SOIC

24L

QFN

Type

Standard Function

GPB0

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.

GPB1

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.

GPB2

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.

GPB3

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.

GPB4

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.

GPB5

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.

GPB6

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.

GPB7

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

Power (high current capable)

VSS

Ground (high current capable)

Chip select

SCK

Serial clock input

Serial data input

Serial data out

RESET

Hardware reset (must be externally biased)

INTB

—

Interrupt output for port B. Can be configured as active high, active low, or open

drain.

INTA

Interrupt output for port A. Can be configured as active high, active low, or open

drain.

GPA0

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.

GPA1

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.

GPA2

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.

GPA3

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.

GPA4

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.

GPA5

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.

GPA6

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.

GPA7

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, 17,

—

Not connected

—

Exposed Thermal Pad (EP). Do not electrically connect, or connect to VSS.

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