MCP2221 datasheet(3/80 Pages) MICROCHIP

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 2015 Microchip Technology Inc.

DS20005292B-page 3

MCP2221

1.0

FUNCTIONAL DESCRIPTION

The MCP2221 is a USB-to-UART serial converter that

enables USB connectivity in applications that have

UART and/or I2C interfaces. The device reduces

external

components

integrating

the

USB

termination resistors and the oscillator needed for USB

operation.

The MCP2221 has four GP pins for miscellaneous

functionalities (including GPIO, USBCFG, SSPND,

Clock Output, ADC, DAC and interrupt detector).

See Table 1-1 and Section 1.7 “Pin Mux Module” for

details about the pin functions.

TABLE 1-1:

PINOUT DESCRIPTION

Name

PDIP,

SOIC,

SSOP

QFN

Type

Standard Function

Alternate Functions

GP0

I/O General-purpose I/O or alternate

function pin

SSPND (OUT)

LED_URX (OUT)

Signals when the host has

entered Suspend mode

UART RX LED activity output

(factory default)

GP1

I/O General-purpose I/O or alternate

function pin

CLKR (OUT)

ADC1 (IN)

LED_UTX (OUT)

IOC (IN)

Clock Reference Output

ADC Channel 1

UART TX Led activity output

(factory default)

External interrupt edge detector

RST

Reset input (with internal pull-up) N/A

URX

UART RX pin (input)

N/A

UTX

UART TX pin (output)

N/A

GP2

I/O General-purpose I/O or alternate

function pin

USBCFG (OUT)

ADC2 (IN)

DAC1 (OUT)

USB device configured status

(factory default)

ADC Channel 2

DAC Output 1

GP3

I/O General-purpose I/O or alternate

function pin

LED_I2C (OUT)

ADC3 (IN)

DAC2 (OUT)

USB-I2C traffic indicator (factory

default)

ADC Channel 3

DAC Output 2

SDA

I/O I2C Data line

N/A

SCL

I/O I2C Clock line

N/A

VUSB

USB USB Power pin (internally

connected to 3.3V)

Should be locally bypassed with

a high-quality ceramic capacitor

D-

USB USB D-

D+

USB USB D+

VSS

Ground

—

Not Connected

VDD

116

Power

—

Exposed Thermal Pad (EP)

Do not electrically connect.

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