MCP23018 datasheet(5/56 Pages) MICROCHIP

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DS22103A-page 5

MCP23018/MCP23S18

1.1

Pin Descriptions

TABLE 1-1:

I2C PINOUT DESCRIPTION (MCP23018)

Name

28L

PDIP/

SOIC

24L

QFN

24L

SSOP

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

VSS

Ground

SCL

Serial clock input

SDA

I/O

Serial data I/O

ADDR

Hardware address pin allows up to 8 slave devices on the bus

RESET

Hardware reset

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, 14,

17, 28

—

Not connected

—

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

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