MCP23016 datasheet(3/38 Pages) MICROCHIP

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DS20090C-page 3

MCP23016

1.0

DEVICE OVERVIEW

The MCP23016 device provides 16-bit, general

purpose,

parallel

I/O

expansion

for

I2C

bus

applications.

This device includes high-current drive capability, low

supply current and individual I/O configuration. I/O

expanders provide a simple solution when additional

I/Os are needed for ACPI, power switches, sensors,

push buttons, LEDs and so on.

The MCP23016 consists of multiple 8-bit configuration

registers for input, output and polarity selection. The

system master can enable the I/Os as either inputs or

outputs by writing the I/O configuration bits. The data

for each input or output is kept in the corresponding

input or output register. The polarity of the read register

can be inverted with the polarity inversion register (see

Section 1.7.3,

“Input

Polarity

Registers”).

All

registers can be read by the system master.

The open-drain interrupt output is activated when any

input state differs from its corresponding input port

master that an input state has changed. The interrupt

capture register captures port value at this time. The

Power-on Reset sets the registers to their default val-

ues and initializes the device state machine.

Three device inputs (A0 - A2) determine the I2C

address and allow up to eight I/O expander devices to

share the same I2C bus.

1.1

Pin Descriptions

TABLE 1-1:

PINOUT DESCRIPTION

Pin Name

PDIP,

SOIC,

SSOP

Pin No.

QFN

Pin No.

I/O/P

Type

Buffer

Type

Description

CLK

Clock source input

—

Test Pin (This pin must be left floating)

GP1.0

I/O

TTL

D0 digital input/output for GP1

GP1.1

I/O

TTL

D1 digital input/output for GP1

GP1.2

I/O

TTL

D2 digital input/output for GP1

GP1.3

I/O

TTL

D3 digital input/output for GP1

GP1.4

I/O

TTL

D4 digital input/output for GP1

GP1.5

I/O

D5 digital input/output for GP1

GP1.6

I/O

D6 digital input/output for GP1

GP1.7

I/O

D7 digital input/output for GP1

GP0.0

I/O

TTL

D0 digital input/output for GP0

GP0.1

I/O

TTL

D1 digital input/output for GP0

GP0.2

I/O

TTL

D2 digital input/output for GP0

GP0.3

I/O

TTL

D3 digital input/output for GP0

GP0.4

I/O

TTL

D4 digital input/output for GP0

GP0.5

I/O

TTL

D5 digital input/output for GP0

GP0.6

I/O

TTL

D6 digital input/output for GP0

GP0.7

I/O

TTL

D7 digital input/output for GP0

SCL

Serial clock input

SDA

I/O

Serial data I/O

INT

Interrupt output

Address input 1

Address input 2

Address input 3

VSS

1, 8, 19

5, 16, 26

—

Ground reference for logic and I/O pins

VDD

—

Positive supply for logic and I/O pins

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