MCP2221T-I/SL_技术文档

MCP2221

USB 2.0 to I²C™/UART Protocol Converter with GPIO

I²C/SMBus

Features:

• The Device Runs as an I²C Master. The Data to

Write/Read On the I²C Bus is Conveyed By the

USB Interface.

Universal Serial Bus (USB)

• Supports Full-Speed USB (12 Mb/s)

• Implements USB Protocol Composite Device:

• I²C Master

- Communication Device Class (CDC) for

USB-to-UART Conversion

- Human Interface Device (HID) for I²C™

Device Control and Configuration

- Up to 400 kHz Clock Rate

- Supports 7- or 10-bit Addressable Devices;

10-bit Addressable Devices are Supported

Through the PC Host Library

• 128-byte Buffer to Handle Data Throughput at

Any Supported UART Baud Rate:

- Supports Block Reads/Writes of Up to 65,535

Bytes Long

- 64-Byte Transmit

- 64-Byte Receive

• SMBus Master

- Supports All of the SMBus Transfers

• Human Interface Device (HID) for Both

I²C Communication and Control:

- SMBus Functionality is Achieved Through a

Combination of Chip and Support Library

Processing

64-byte Buffer to Handle Data Throughput at

Any I²C Baud Rate

- Up to 400 kHz Clock Rate

• Fully-Configurable VID and PID Assignments and

String Descriptors

General-Purpose Input/Output (GPIO) Pins

• Bus-powered or Self-powered

• Four General-Purpose Input/Output Pins

• USB 2.0-Compliant: TID# 40001594

• All GP Pins Can Be Assigned to Other

Functionalities

USB Driver and Software Support

Other Functionalities

• Enumerates as a Composite USB Device (CDC

and HID) Using Standard Drivers for Virtual Com

Port (VCP) on the Following Windows^®Operating

Systems: XP^®(SP3), Vista^®, 7, 8 and 8.1

• UART Activity LED Outputs (UTX and URX)

• SSPND Output Pin

• USBCFG Output Pin (Indicates When the

Enumeration Has Completed)

• Configuration Utility for Establishing a Custom

Boot-up Configuration

• I²C/SMBus Terminal

• Three ADC Inputs

• One DAC with Two Possible Output Options

• Windows DLL

• Clock Reference Output: 12 MHz or Other

Configurable Values

CDC and Universal Asynchronous

Receiver/Transmitter (UART) Options

• External Interrupt Edge Detection

• Communications Device Class (CDC) for the

USB-to-UART Option

Other

• Operating Voltage: 3.0 to 5.5V

• Responds to SET LINE CODINGCommands to

Dynamically Change Baud Rates

• Electrostatic Discharge (ESD) Protection: > 4 kV

Human Body Model (HBM)

• Supports Baud Rates: 300-115200

• UART TX and RX Pins Only

• Industrial (I) Operating Temperature: -40°C to +85°C

• Serial Number Used During the CDC

Enumeration Can Be Enabled By Using the

Microchip-provided Configuration Utility or By

Calling the Proper API From the Support Libraries

for this Device

 2015 Microchip Technology Inc.

DS20005292B-page 1

MCP2221

Package Types

MCP2221

4 x 4 QFN*

MCP2221

PDIP/SOIC/TSSOP

1

2

3

4

5

6

7

14

13

VDD

GP0

GP1

RST

URX

UTX

GP2

VSS

D+

16 15 14 13

GP0

GP1

RST

URX

12 D+

11 D-

1

2

3

4

12 D-

11

EP

17

VUSB

10 VUSB

10 SCL

9

8

SDA

GP3

9

SCL

5

6

7

8

* Includes Exposed Thermal Pad (EP); see Table 1-1.

Block Diagram

CONFIG

USB Module &

Transceiver

I²C

Bus

USB

Bus

I²C Master

USB HID

USB CDC

BUS MATRIX

TXD/RXD

Internal

Oscillator

UART

IOC

GP Pins

MUX

GPIO

ADC/DAC

CLKR

DS20005292B-page 2

 2015 Microchip Technology Inc.

MCP2221

The MCP2221 has four GP pins for miscellaneous

functionalities (including GPIO, USBCFG, SSPND,

Clock Output, ADC, DAC and interrupt detector).

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 by integrating the USB

termination resistors and the oscillator needed for USB

operation.

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

details about the pin functions.

TABLE 1-1:

PINOUT DESCRIPTION

PDIP,

SOIC, QFN

SSOP

Standard Function

Alternate Functions

Name

Type

GP0

2

1

I/O General-purpose I/O or alternate SSPND (OUT)

function pin

Signals when the host has

entered Suspend mode

UART RX LED activity output

(factory default)

LED_URX (OUT)

GP1

3

2

I/O General-purpose I/O or alternate CLKR (OUT)

Clock Reference Output

ADC Channel 1

function pin

ADC1 (IN)

LED_UTX (OUT) UART TX Led activity output

(factory default)

IOC (IN)

External interrupt edge detector

RST

URX

UTX

GP2

4

5

6

7

3

4

5

6

I

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

UART RX pin (input)

UART TX pin (output)

N/A

O

I/O General-purpose I/O or alternate USBCFG (OUT) USB device configured status

function pin

(factory default)

ADC Channel 2

DAC Output 1

ADC2 (IN)

DAC1 (OUT)

USB-I²C traffic indicator (factory

default)

GP3

8

7

I/O General-purpose I/O or alternate LED_I2C (OUT)

function pin

ADC3 (IN)

DAC2 (OUT)

ADC Channel 3

DAC Output 2

I²C Data line

I²C Clock line

SDA

SCL

VUSB

9

8

9

I/O

N/A

10

11

10 USB USB Power pin (internally

connected to 3.3V)

Should be locally bypassed with

a high-quality ceramic capacitor

D-

12

13

14

—

11 USB USB D-

12 USB USB D+

D+

VSS

NC

13

P

Ground

14

15

—

Not Connected

VDD

EP

1

16

17

P

Power

—

Exposed Thermal Pad (EP)

Do not electrically connect.

 2015 Microchip Technology Inc.

DS20005292B-page 3

MCP2221

1.3.1

GET/SET LINE CODING

1.1

Supported Operating Systems

The GET_LINE_CODING and SET_LINE_CODING

commands are used to read and set the UART

parameters while in operation. For example, terminal

applications (e.g., Putty, RealTerm, Hyperterminal,

etc.) send the SET_LINE_COMMANDwhen connecting

to the port. The MCP2221 responds by setting the baud

rate only.

The following operating systems are supported:

• Windows – XP (SP3), Vista, 7, 8 and 8.1

• Linux^®– any distribution with support for CDC

and HID classes

• Mac OS^®– all versions – beginning with 10.7

1.1.1

ENUMERATION

The other parameters (Data Bits, Parity, Stop Bits)

remain unchanged.

The MCP2221 enumerates as a composite USB device

after POR. The device enumerates as both a Human

Interface Device (HID) for I²C, GPIO control, and as

CDC for the USB-to-UART converter.

Note:

MCP2221 supports only eight Data bits,

no Parity, and one Stop bit.

1.3.1.1

Rounding Errors

1.1.1.1

USB HID

Primary baud rate settings (with associated rounding

errors) are shown in Table 1-2.

The MCP2221 enumerates as an HID, so the device

can be configured, while the I²C and GPIO can be

controlled. A DLL package, with example applications

and tools, is supplied by Microchip on the device web

page, on the Microchip web site www.microchip.com.

If baud rates other than the ones shown in the table are

used, the error percentage can be calculated using

Equation 1-1 to find the actual baud rate.

TABLE 1-2:

UART PRIMARY BAUD

RATES

1.1.1.2

USB CDC

The CDC enumeration implements the USB-to-UART

data translation.

Desired Rate

Actual rate

% Error

300

1200

300

1200

0.00%

0.16%

1.2

Bus-Matrix Module

The Bus-Matrix module is the heart of the MCP2221.

All other modules are tied together and controlled via

the Bus-Matrix module. This module manages the data

transfers between the USB and the UART, the I²C

Master module, as well as the command requests

generated by the USB host controller and commands

for controlling the function of the UART, GPIO, ADC,

DAC and Clock Output.

2400

4800

9600

19200

38400

57600

115200

19200

38339

57692

115385

1.2.1

UART

EQUATION 1-1:

SOLVING FOR ACTUAL

BAUD RATE

The control module interfaces to the UART and USB

modules.

12MHz

intx

ActualRate = ------------------

1.2.2

ACCESSING THE DEVICE

The MCP2221 can be accessed for reading and writing

via USB host commands. The device cannot be

accessed or controlled via the UART interface.

Where:

12MHz

x = ----------------------------------

DesiredBaud

1.3

UART Interface

1.3.2

CUSTOM BAUD RATES

The MCP2221 UART interface consists of the TX and

RX data signals.

Custom baud rates are configured by sending the

SET_LINE_CODING USB command. See Section 2.0

“USB Enumeration Process” for more information.

The UART is configurable for several baud rates. The

available baud rates are listed in Table 1-2.

DS20005292B-page 4

 2015 Microchip Technology Inc.

MCP2221

FIGURE 1-1:

CHIP SETTINGS RUN

TIME MANAGEMENT

1.4

Device Configuration

The MCP2221 keeps all the essential device

configuration settings stored in Flash memory.

Power-Up/Reset

Device configuration settings affect the way the

MCP2221 behaves at run time.

The settings are stored into the Flash memory on the

device. Some of the settings are also copied into

SRAM at Power-Up/Reset.

Copy FLASH Chip and

GP settings to SRAM

These device configuration settings reside in the

following two distinct areas of Flash memory:

USB enumeration

& configuration

complete

• Chip Settings

The Chip Settings area stores the key MCP2221

parameters

–

USB parameters, ADC/DAC

reference voltage choice, start-up DAC value,

Clock Reference output (CLKR) frequency and

duty cycle values.

No

Yes

SRAM settings

changes needed

• GP Settings

The GP Settings area stores the GP designation

settings. For GP settings that are assigned to

GPIO output operation, output values (logic 1or 0)

are also specified.

Change the

SRAM settings

Even though the MCP2221 places a partial copy of the

Chip Settings in SRAM, the following Chip Settings

always reside in Flash:

• USB Manufacturer/Product and Serial Number

descriptors

The SRAM settings (GP and partial Chip Settings) can

be modified through USB HID commands and they will

have an effect on the following device features:

• USB VID and PID pair

• USB options (e.g., the requested amount of

current that is presented to the USB host during

the USB enumeration process)

• GP pin designation (switch between GPIO,

dedicated or special functions modes)

• GPIO direction and output value (only for GPIO

outputs) – for the GPs assigned to work in GPIO

mode

1.4.1

POWER-UP/RESET DEVICE

CONFIGURATION BEHAVIOR

• Clock Output duty cycle and value – if GP1 is

assigned for CLKR mode (Clock Reference

output mode), by modifying the SRAM settings,

the clock frequency and duty cycle can be

changed at run time

At Power-Up/Reset, the MCP2221 configures the

device options (GP designation, special function pins

parameters and USB enumeration options) according

to the Flash settings. Then, the Flash Chip Settings and

GP Settings are loaded into SRAM to allow for their

temporary modification at run time.

• DAC value and voltage reference used – the DAC

value setting as well as the voltage reference

used for it are stored in SRAM settings and they

can be changed at run time. Through this

mechanism, at run time the user can change the

DAC value, as well as the voltage reference.

Chip Settings of the Device Configuration Flash is

copied partially into SRAM. Only the run-

time-modifiable parameters are copied into SRAM.

GP Settings of the Device Configuration Flash (GP

settings area) are copied entirely into the SRAM. By

copying the GP settings completely into SRAM, the

user is allowed to completely change the GP

designation at run time.

• ADC voltage reference value – the voltage

reference used for ADC conversions can be

changed by altering its corresponding SRAM

setting

• Interrupt-On-Change (IOC) detector settings – if

GP1 is assigned for IOC mode, the SRAM

settings are used for setting up the triggers used

for external interrupt detection (positive, negative

edge detection or both)

The SRAM copy of the settings can be altered at run

time in order to change certain device behavior, e.g.,

GP designation (the GPs can be re-assigned for a

different type of operation than the one assigned at

Power-Up) and special parameters (DAC value,

ADC/DAC voltage references, Clock output value).

 2015 Microchip Technology Inc.

DS20005292B-page 5

MCP2221

1.4.2

CHIP SETTINGS MAP

The Chip Settings area resides in Flash memory and is

copied into SRAM at run time. Not all of the device’s

settings can be altered at run time. All the fields in the

Flash settings can be altered by the user.

TABLE 1-3:

CHIP SETTINGS MAP

Register Name

Byte

Index

Comments

0

CHIPSETTING0

Controls the USB CDC serial number enumeration, default state for the GP LED

designation, default state for GP dedicated-function pins and chip settings

protection level

1

2

CHIPSETTING1

CHIPSETTING2

CHIPSETTING3

USBVIDL

USBVIDH

USBPIDL

USBPIDH

USBPWRATTR

USBREQCRT

PASS0

Default clock output divider and duty cycle

DAC reference options and default DAC value

ADC reference and interrupt detection settings

USB VID lower byte

3

4

5

USB VID higher byte

6

USB PID lower value

USB PID higher byte

7

8

USB power attributes

USB required current

Password byte 0

9

10

11

12

13

14

15

16

17

PASS1

Password byte 1

PASS2

Password byte 2

PASS3

Password byte 3

PASS4

Password byte 4

PASS5

Password byte 5

PASS6

Password byte 6

PASS7

Password byte 7

DS20005292B-page 6

 2015 Microchip Technology Inc.

MCP2221

REGISTER 1-1:

R/W-0 R/W-1

CDCSNEN LEDURXINST LEDUTXINST LEDI2CINST SSPNDINST USBCFGINST CHIPPROT1 CHIPPROT0

CHIPSETTING0 REGISTER

R/W-1 R/W-1

R/W-1

R/W-0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1-0

CDCSNEN: USB CDC Serial Number Enable

1= USB CDC Serial Number is enumerated

0= No USB CDC Serial Number enumeration (factory default)

LEDURXINST: LED UART RX Inactive State

1= LED UART RX is inactive high and active low (factory default)

0= LED UART RX is inactive low and active high

LEDUTXINST: LED UART TX Inactive State

1= LED UART TX is inactive high and active low (factory default)

0= LED UART TX is inactive low and active high

LEDI2CINST: LED I²C Inactive State

1= LED I²C is inactive high and active low (factory default)

0= LED I²C is inactive low and active high

SSPNDINST: SSPND Inactive State

1= SSPND is inactive high and active low (factory default)

0= SSPND is inactive low and active high

USBCFGINST: USBCFG Inactive State

1= USBCFG is inactive high and active low (factory default)

0= USBCFG is inactive low and active high

CHIPPROT<1:0>: Chip Settings Protection Level

11= Reserved

10= Permanently locked

01= Password protection

00= Chip settings unprotected (factory default)

 2015 Microchip Technology Inc.

DS20005292B-page 7

MCP2221

REGISTER 1-2:

CHIPSETTING1 REGISTER

R/W-0

—

R/W-0

—

R/W-0

—

R/W-1

R/W-0

R/W-1

R/W-0

CLKDC1

CLKDC0

CLKDIV2

CLKDIV1

CLKDIV0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

-n = Value at POR

bit 7-5

bit 4-3

Reserved: Set to ‘0’

CLKDC<1:0>: Clock-Out Duty-Cycle

11= Duty cycle 75% (75% of 1 clock period is logic ‘1’ and 25% of 1 clock period is logic ‘0’)

10= Duty cycle 50% (50% of 1 clock period is logic ‘1’ and 50% of 1 clock period is logic ‘0’)

(factory default)

01= Duty cycle 25% (25% of 1 clock period is logic ‘1’ and 75% of 1 clock period is logic ‘0’)

00= Duty cycle 0% (100% of 1 clock period is logic ‘0’)

bit 2-0

CLKDIV<2:0>: Clock-Out Divider Output

111= 375 kHz clock output

110= 750 kHz clock output

101= 1.5 MHz clock output

100= 3 MHz clock output

011= 6 MHz clock output

010= 12 MHz clock output (factory default)

001= 24 MHz clock output

000= Reserved

REGISTER 1-3:

CHIPSETTING2 REGISTER

R/W-1

R/W-0

R/W-1

R/W-0

DACVAL0

bit 0

DACVRM1 DACVRM0

bit 7

DACREF

DACVAL4

DACVAL3

DACVAL2

DACVAL1

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-6

DACVRM<1:0>: DAC Internal Voltage Reference (DAC VRM) Selection

11= VRM voltage is 4.096V (only if VDD is above this voltage)

10= VRM voltage is 2.048V (factory default)

01= VRM voltage is 1.024V

00= VRM is off

bit 5

DACREF: DAC Reference Output Selection

1= DAC reference output is DAC VRM voltage selection

0= DAC reference output is VDD (factory default)

bit 4-0

DACVAL<4:0>: Initial DAC Output Value

5-bit value for the DAC output (factory default is 8 decimal)

DS20005292B-page 8

 2015 Microchip Technology Inc.

MCP2221

REGISTER 1-4:

CHIPSETTING3 REGISTER

R/W-1 R/W-1 R/W-0

INTDETFEEN INTDETREEN ADCVRM1 ADCVRM0

R/W-0

R/W-1

R/W-0

—

R/W-0

—

ADCREF

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7

bit 6

Reserved: Set to ‘0’

INTDETFEEN: Interrupt Falling Edge Detect Enable

1= Interrupt detector will trigger when a falling edge is detected (factory default)

0= Falling edges will not trigger the detector

bit 5

INTDETREEN: Interrupt Rising Edge Detect Enable

1= Interrupt detector will trigger when a rising edge is detected (factory default)

0= Rising edges will not trigger the detector

bit 4-3

ADCVRM<1:0>: ADC Internal Voltage Reference (ADC VRM) Selection

11= VRM voltage is 4.096V (only if VDD is above this voltage)

10= VRM voltage is 2.048V

01= VRM voltage is 1.024V (factory default)

00= VRM is off

bit 2

ADCREF: ADC Reference Output Selection

1= ADC reference output is ADC VRM voltage selection (factory default)

0= ADC reference output is VDD

bit 1-0

Reserved: Set to ‘0’

REGISTER 1-5:

USBVIDL REGISTER

R/W-1

USBVIDL6

R/W-0

R/W-1

R/W-0

USBVIDL7

bit 7

USBVIDL5

USBVIDL4

USBVIDL3

USBVIDL2

USBVIDL1 USBVIDL0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-0

USBVIDL<7:0>: USB VID Lower Byte (factory default: 0xD8(hex))

REGISTER 1-6:

USBVIDH REGISTER

R/W-0

USBVIDH6

R/W-0

R/W-1

R/W-0

USBVIDH7

bit 7

USBVIDH5

USBVIDH4 USBVIDH3

USBVIDH2 USBVIDH1 USBVIDH0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-0

USBVIDH<7:0>: USB VID Higher Byte (factory default: 0x04(hex))

 2015 Microchip Technology Inc.

DS20005292B-page 9

MCP2221

REGISTER 1-7:

USBPIDL REGISTER

R/W-1

USBPIDL6

R/W-0

R/W-1

R/W-0

R/W-1

USBPIDL7

bit 7

USBPIDL5

USBPIDL4

USBPIDL3

USBPIDL2

USBPIDL1 USBPIDL0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-0

USBPIDL<7:0>: USB PID Lower Byte (factory default: 0xDD(hex))

REGISTER 1-8:

USBPIDH REGISTER

R/W-0

USBPIDH6

R/W-0

USBPIDH7

bit 7

USBPIDH5

USBPIDH4 USBPIDH3

USBPIDH2 USBPIDH1 USBPIDH0

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-0

USBPIDH<7:0>: USB PID Higher Byte (factory default: 0x00(hex))

REGISTER 1-9:

USBPWRATTR REGISTER

R/W-0

SELFPWR

R/W-0

—

R/W-0

—

R/W-0

—

R/W-0

—

REMWKUP

—

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7

bit 6

Reserved: Reserved – set to ‘1’ (factory default)

SELFPWR: USB Self-Powered Attribute

1= Chip will enumerate on the USB bus as being self-powered

0= Chip will enumerate on the USB bus as being USB-bus powered (factory default)

bit 5

REMWKUP: USB Remote Wake-Up Capability

1= Chip will enumerate on the USB bus as being able to wake up the USB host

0= Chip will enumerate as not being capable of remote wake-up of the USB host (factory default)

bit 4-0

Reserved: Set all bits to ‘0’ (factory default)

DS20005292B-page 10

 2015 Microchip Technology Inc.

MCP2221

REGISTER 1-10: USBREQCRT REGISTER

R/W-0 R/W-0 R/W-1 R/W-1

USBREQC USBREQCRT USBREQCRT USBREQCR USBREQCR USBREQCR USBREQCR USBREQC

R/W-0

T3

R/W-0

T2

R/W-1

T1

R/W-0

RT7

6

5

T4

RT0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-0

USBREQCRT<7:0>: USB Bus-Powered Required Current Amount (in units of 2 mA)

Factory default is 50 (decimal); the USB enumeration interprets this value as a current requirement of

100 mA.

REGISTER 1-11: PASS0 – PASS7 REGISTER

R/W-0

PASSx7

PASSx6

PASSx5

PASSx4

PASSx3

PASSx2

PASSx1

PASSx0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

-n = Value at POR

bit 7-0

PASSx<7:0>: Password Byte X Value (factory default is 0)

 2015 Microchip Technology Inc.

DS20005292B-page 11

MCP2221

1.4.3

GP SETTINGS MAP

The GP Settings area resides in Flash memory and is

copied into SRAM at run time. The user can alter both

the Flash and the SRAM GP settings. Any modification

in the SRAM copy of the GP settings will have an

immediate effect. The GP pins designation changes

according to the new content of the SRAM settings.

The Flash variant of the settings will affect the

Power-Up behavior of the GP pins.

TABLE 1-4:

GP SETTINGS MAP

Register

Name

Byte

Index

Comments

0

1

2

3

GPSETTING0 GP0 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING1 GP1 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING2 GP2 pin designation and GPIO default output value, when GP is set for GPIO output operation

GPSETTING3 GP3 pin designation and GPIO default output value, when GP is set for GPIO output operation

REGISTER 1-12:

GPSETTING0 REGISTER

R/W-0

—

R/W-0

—

R/W-1

GPIOOUTVAL

R/W-0

R/W-1

R/W-0

—

GPIODIR

GPDES2

GPDES1

GPDES0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-5

bit 4

Reserved: Set to ‘0’

GPIOOUTVAL: GPIO Output Value (valid only when GP0 is set for GPIO output operation)

1= Default output value is logic ‘1’ (factory default)

0= Default output value is logic ‘0’

bit 3

GPIODIR: GPIO Direction (input or output; valid only when GP0 is set for GPIO operation)

1= GPIO Input

0= GPIO Output (factory default)

bit 2-0

GPDES<2:0>: GP0 Designation

111= Reserved

110= Reserved

101= Reserved

100= Reserved

011= Reserved

010= Alternate function 0 (LED UART RX – LEDURX) (factory default)

001= Dedicated function operation (SSPND)

000= GPIO operation (GPIO0)

DS20005292B-page 12

 2015 Microchip Technology Inc.

MCP2221

REGISTER 1-13:

GPSETTING1 REGISTER

R/W-0

—

R/W-0

—

R/W-1

GPIOOUTVAL

R/W-0

R/W-1

—

GPIODIR

GPDES2

GPDES1

GPDES0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-5

bit 4

Reserved: Set to ‘0’

GPIOOUTVAL: GPIO Output Value (valid only when GP1 is set for GPIO output operation)

1= Default output value is logic ‘1’ (factory default)

0= Default output value is logic ‘0’

bit 3

GPIODIR: GPIO Direction (input or output; valid only when GP1 is set for GPIO operation)

1= GPIO Input

0= GPIO Output (factory default)

bit 2-0

GPDES<2:0>: GP1 Designation

111= Reserved

110= Reserved

101= Reserved

100= Alternate function 2 (Interrupt detector)

011= Alternate function 1 (LED UART TX – LEDUTX) (factory default)

010= Alternate function 0 (ADC1)

001= Dedicated function operation (Clock Output)

000= GPIO operation (GPIO1)

 2015 Microchip Technology Inc.

DS20005292B-page 13

MCP2221

REGISTER 1-14:

GPSETTING2 REGISTER

R/W-0

—

R/W-0

—

R/W-1

R/W-0

R/W-1

—

GPIOOUTVAL

GPIODIR

GPDES2

GPDES1

GPDES0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-5

bit 4

Reserved: Set to ‘0’

GPIOOUTVAL: GPIO Output Value (valid only when GP2 is set for GPIO output operation)

1= Default output value is logic ‘1’ (factory default)

0= Default output value is logic ‘0’

bit 3

GPIODIR: GPIO Direction (input or output; valid only when GP2 is set for GPIO operation)

1= GPIO Input

0= GPIO Output (factory default)

bit 2-0

GPDES<2:0>: GP2 Designation

111= Reserved

110= Reserved

101= Reserved

100= Reserved

011= Alternate function 1 (DAC1)

010= Alternate function 0 (ADC2)

001= Dedicated function operation (USBCFG) (factory default)

000= GPIO operation (GPIO2)

DS20005292B-page 14

 2015 Microchip Technology Inc.

MCP2221

REGISTER 1-15:

GPSETTING3 REGISTER

R/W-0

—

R/W-0

—

R/W-1

GPIOOUTVAL

R/W-0

R/W-1

—

GPIODIR

GPDES2

GPDES1

GPDES0

bit 7

bit 0

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

bit 7-5

bit 4

Reserved: Set to ‘0’

GPIOOUTVAL: GPIO Output Value (valid only when GP3 is set for GPIO output operation)

1= Default output value is logic ‘1’ (factory default)

0= Default output value is logic ‘0’

bit 3

GPIODIR: GPIO Direction (input or output; valid only when GP3 is set for GPIO operation)

1= GPIO Input

0= GPIO Output (factory default)

bit 2-0

GPDES<2:0>: GP3 Designation

111= Reserved

110= Reserved

101= Reserved

100= Reserved

011= Alternate function 1 (DAC2)

010= Alternate function 0 (ADC3)

001= Dedicated function operation (LEDI2C) (factory default)

000= GPIO operation (GPIO3)

 2015 Microchip Technology Inc.

DS20005292B-page 15

MCP2221

1.5

USB Module (HID, CDC and

Transceiver Modules)

1.6

USB Transceiver

The MCP2221 has a built-in USB 2.0 full-speed

transceiver internally connected to the USB module.

The USB HID and CDC modules in the MCP2221 are

full-speed USB 2.0-compliant.

The USB transceiver obtains power from the VUSB pin,

which is internally connected to the 3.3V regulator. The

best electrical signal quality is obtained when VUSB is

locally bypassed with a high-quality ceramic capacitor.

• Composite device (CDC + HID):

- CDC: USB-to-UART Communications

- HID: I²C Transactions, GPIO Control,

Configuration and Miscellaneous Operations

(ADC, DAC, Clock Output)

1.6.1

INTERNAL PULL-UP RESISTORS

• 128-byte buffer to handle data throughput at any

UART Baud Rate:

The MCP2221 devices have built-in pull-up resistors

designed to meet the requirements for full-speed USB.

- 64-Byte Transmit

- 64-Byte Receive

1.6.2

MCP2221 POWER OPTIONS

• Fully Configurable VID and PID Assignments and

Descriptors (stored on-chip)

The following are the main power options for the

MCP2221:

• Bus-Powered or Self-Powered

• USB Bus-Powered (5V)

• 3.3V Self-Powered

1.5.1

DESCRIPTORS

1.6.2.1

Internal Power Supply Details

During configuration, the supplied PC interface stores

the descriptors in the MCP2221.

MCP2221 offers various options for power supply. To

meet the required USB signaling levels, the MCP2221

incorporates an internal LDO that is used solely by the

USB transceiver to present the correct D+/D- voltage

levels.

1.5.2

SUSPEND AND RESUME

The USB Suspend and Resume signals are supported

for power management of the MCP2221. The device

enters Suspend mode when “Suspend Signaling” is

detected on the bus.

Figure 1-2 shows the internal connections of the USB

transceiver LDO in relation to the VDD power supply

rail. The output of the USB transceiver LDO is tied to

the VUSB line. A capacitor connected to the VUSB pin is

required if the USB transceiver LDO provides the 3.3V

supply to the transceiver.

The MCP2221 exits Suspend mode when any of the

following events occur:

• “Resume Signaling” is detected or generated

• A USB “Reset” signal is detected

• A device Reset occurs

FIGURE 1-2:

MCP2221 INTERNAL

POWER SUPPLY DETAILS

VDD

IN

LDO

3.3V

OUT

VUSB

D+

D-

USB

Transceiver

DS20005292B-page 16

 2015 Microchip Technology Inc.

MCP2221

The provided VDD voltage has a direct influence on the

voltage levels present on the GPIO and UART TX/RX

pins. When VDD is 5V, all of these pins will have a

logical ‘1’ around 5V with the variations specified in

Section 4.1 “DC Characteristics”.

During USB Suspend mode, the D+ or D- pull-up

resistor must remain active, which will consume some

of

the

allowed

suspend

current

budget

(500 µA/2.5 mA). The VUSB pin requires an external

bypass capacitor with a value between 0.22 and

0.47 µF (ceramic cap).

For applications that require a 3.3V logical ‘1’ level,

VDD must be connected to a power supply providing

the 3.3V voltage. In this case, the internal USB

transceiver LDO cannot provide the required 3.3V

power. It is necessary to also connect the VUSB pin of

the MCP2221 to the 3.3V power supply rail. This way,

the USB transceiver is powered up directly from the

3.3V power supply.

Figure 1-4 shows a circuit where MCP2221’s internal

LDO is used to provide 3.3V to the USB transceiver.

The voltage on the VDD affects the voltage levels onto

the UART and GPIO pins. With VDD at 5V, these pins

will have a logic ‘1’ of 5V with the variations specified in

Section 4.1 “DC Characteristics”.

FIGURE 1-4:

TYPICAL POWER SUPPLY

OPTION USING THE 5V

PROVIDED BY THE USB

1.6.2.2

USB Bus-Powered (5V)

In Bus Power Only mode, all power for the application

is drawn from the USB (Figure 1-3). This is effectively

the simplest power method for the device.

5V (USB Bus)

or external

power supply

VDD

FIGURE 1-3:

BUS POWER ONLY

IN

LDO

3.3V

VBUS

VDD

VUSB

OUT

VUSB

VSS

D+

D-

USB

Transceiver

In order to meet the inrush current requirements of the

USB 2.0 specifications, the total effective capacitance

appearing across VBUS and ground must be no more

than 10 µF. If it is more than 10 µF, some kind of inrush

limiting is required. For more details on Inrush Current

Limiting, search for that subject in the latest “Universal

Serial Bus Specification”.

According to the USB 2.0 specification, all USB devices

must also support a Low-Power Suspend mode. In the

USB Suspend mode, devices must consume no more

than 500 µA (or 2.5 mA for high-powered devices that

are remote wake-up capable) from the 5V VBUS line of

the USB cable.

The host signals the USB device to enter Suspend

mode by stopping all USB traffic to that device for more

than 3 ms.

The USB bus provides a 5V voltage. However, the USB

transceiver requires 3.3V for the signaling (on D+ and

D- lines).

 2015 Microchip Technology Inc.

DS20005292B-page 17

MCP2221

1.6.2.3

3.3V Self-Powered

1.7

Pin Mux Module

Typically, many embedded applications are using 3.3V

power supplies. When such option is available in the

target system, MCP2221 can be powered up from the

existing 3.3V power supply rail. The typical connections

for MCP2221 are shown in Figure 1-5.

The Pin Mux module offers multiple functionalities for

the GP pins.

1.7.1

CONFIGURABLE PIN FUNCTIONS

The pins can be configured as:

In this example, MCP2221 has both VDD and VUSB

lines tied to the 3.3V rail. These tied connections

disable the internal USB transceiver LDO of the

MCP2221 to regulate the power supply on the VUSB

pin. Another consequence is that the ‘1’ logical level on

the GPIO pins will be at the 3.3V level, in accordance

with the variations specified in Section 4.1 “DC

Characteristics”.

• GPIO – individually configurable general-purpose

input or output

• SSPND – USB Suspend state

• USBCFG – indicates USB configuration status

• LED_URX – indicates UART receive traffic (when

seen from the MCP2221)

• LED_UTX – indicates UART transmit traffic (when

seen from the MCP2221)

• LED_I2C – indicates I²C traffic

1.6.2.4

Remote Wake-Up Capability

The MCP2221 offers a mechanism for triggering a

remote wake-up event for the USB host. The remote

wake-up trigger works only with the external interrupt

detector.

• ADC1/2/3 – analog inputs connected to the

internal 10-bit ADC

• DAC1/2 – analog outputs connected to the same

5-bit DAC

In order to use this capability, GP1 must be designated

for interrupt detection operation. Before the USB host

goes into Sleep/Standby, the interrupt detector must be

set up for detecting positive edges, negative edges or

both; also, the detector flag must be cleared. After

these conditions are met, the USB host can go into

Sleep/Standby mode and it will be awakened whenever

an external signal on GP1 triggers the interrupt

detector.

• CLKR – digital clock output (the nominal value is

12 MHz, but other values are possible)

• IOC – external interrupt detector

1.7.1.1

GPIO Pin Function

When the GPIO pin function is enabled for a given

GP(n) pin, it will operate as a digital input or an output

pin. When configured as a digital output, its value is

controlled through the USB HID commands. When

configured as a digital input, its logic value is read using

USB HID commands.

FIGURE 1-5:

USING AN EXTERNALLY

PROVIDED 3.3V POWER

SUPPLY

1.7.1.2

SSPND Pin Function

5V (USB Bus)

or external

power supply

The SSPND pin (if enabled) reflects the USB state

(Suspend/Resume). The pin is active low

(factory-default setting; see the CHIPSETTING0

register for more details) when the Suspend state has

been issued by the USB host. Likewise, the pin drives

high after the Resume state is achieved.

External

3.3V

LDO

VDD

IN

LDO

3.3V

This pin allows the application to go into Low Power

mode when USB communication is suspended and

switches to a full active state when USB activity is

resumed.

OUT

VUSB

1.7.1.3

USBCFG Pin Function

The USBCFG pin (if enabled) starts out low (factory

default setting; see the CHIPSETTING0 register for

more details) during Power-Up or after Reset and goes

high after the device successfully configures to the

USB. The pin will go low when in Suspend mode and

high when the USB resumes.

D+

D-

USB

Transceiver

DS20005292B-page 18

 2015 Microchip Technology Inc.

MCP2221

1.7.1.4

LED_URX

1.7.1.6

LED_I2C

The “RX” in this pin name refers to the UART of the

MCP2221. The LED_URX pin is an indicator of UART

RX characters being received.

The “I2C” in this pin name refers to the I²C module in

the MCP2221. The LED_I2C pin is an indicator of I²C

activity.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

register for more details) for a period of time (a few

milliseconds). This allows the application to provide a

visual indication of the UART RX traffic.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

register for details) for a period of time (a few

milliseconds). This allows the application to provide a

visual indication of the I²C traffic.

1.7.1.5

LED_UTX

1.7.1.7

ADC1/2/3

The “TX” in this pin name refers to the UART of the

MCP2221. The LED_UTX pin is an indicator of UART

TX characters being transmitted.

When GP1/2/3 are configured for ADC operation, they

will work as analog input pins and they are tied to the

first three channels of the 10-bit ADC in the MCP2221.

This pin will pulse low or high (depending on the chip

configuration settings; see the CHIPSETTING0

register for more details) for a period of time (a few

milliseconds). This allows the application to provide a

visual indication of the UART TX traffic.

1.7.1.8

DAC1/2

When GP2/3 are configured for DAC operation, they

will work as analog output pins and they are tied to the

output of the MCP2221’s 5-bit DAC.

TABLE 1-5:

GP DESIGNATION TABLE

Assignment GP0

GPIO

GP

Designation

Bits <2:0>

GP1

GP2

GP3

000

001

010

011

100

GPIO

SSPND

LED_URX

—

GPIO

CLK OUT

ADC1

GPIO

USBCFG

ADC2

DAC1

—

GPIO

LED_I2C

ADC3

DAC2

—

DEDICATED_FUNC

ALT_FUNC_0

ALT_FUNC_1

LED_UTX

IOC

ALT_FUNC_2

—

 2015 Microchip Technology Inc.

DS20005292B-page 19

MCP2221

1.8.3

DAC CONVERTER

1.8

GPIO/ADC/DAC Module

The DAC is 5-bit wide, has a single analog output and

it uses its own VRM module.

This module communicates with the USB HID

sub-module through the Bus Matrix module. It allows

the manipulation of GPIOs, retrieving the ADC data

and setting the DAC value.

The DAC output voltage can be routed to GP2/3 (if

GP2/3 are configured for DAC operation).

If the GP2 and GP3 are configured for DAC operation,

they will present the same analog voltage value

because they are connected to the same DAC output.

1.8.1

GPIO

When the GPs are configured for GPIO operation,

those configured GPs can be used as digital inputs or

outputs.

FIGURE 1-7:

DAC SUB-MODULE

DETAILS

When working as outputs, the GPs output logic levels

(logic 0or 1).

5-Bit Value

Analog

Output

1.8.1.1

VRM

5-Bit DAC

The ADC and DAC sub-modules each have a voltage

reference module (VRM). Each VRM can be configured

(at Power-Up and run time) to output one of the four

voltage choices available.

CHIPSETTING2<5>

Analog Mux

VDD

The VRM can provide the following voltages as a

reference:

OFF

2.048V

4.096V

CHIPSETTING2<7:6>

• VDD – the VRM output is exactly the voltage

present at the VDD pin of the MCP2221. It can

take any value from 3.3 to 5V.

1.024V

VRM

• 1.024V – the VRM output of 1.024V is obtained

from an internal voltage reference

• 2.048V – the VRM output of 2.048V is obtained

from an internal voltage reference

• 4.096V – the VRM output of 4.096V is obtained

from an internal voltage reference. If the VDD is

lower than 4.096V, the VRM output will have the

value of VDD.

1.8.2

ADC CONVERTER

The ADC converter is producing 10-bit values and it

uses its own VRM module.

It features three external channels (connected to

GP1/2/3 if configured for ADC operation).

The sampling rate of the ADC is around 1000 sps.

FIGURE 1-6:

ADC SUB-MODULE

DETAILS

3 Ext. Channels

10-Bit

Value

10-bit ADC

Analog Mux

CHIPSETTING3<2>

VDD

OFF

2.048V

4.096V

CHIPSETTING3<4:3>

1.024V

VRM

DS20005292B-page 20

 2015 Microchip Technology Inc.

MCP2221

2

1.9

CLKR

1.13 I C™ Master Module

When GP1 is configured for clock output operation, the

GP1 pin will act as a digital output, providing a clock

signal derived from the device’s internal clock. The

clock’s nominal frequency is 12 MHz ± 0.25%. Other

clock values and duty cycles are possible by setting

different values that are associated with this mode of

operation.

The I²C Master module is responsible for the I²C traffic

generation. The module is controlled through the USB

HID, through the Bus Matrix module.

The I²C module only implements the functionality of an

I²C/SMBus Master.

1.13.1

I²C/SMBUS MASTER

The I²C Master initiates all the I²C/SMBus transactions

(being read or write operations) on the bus.

The I²C/SMBus Master module has the following

capabilities:

1.10 IOC

When GP1 is configured for Interrupt-on-Change (IOC)

operation, GP1 acts as a digital input that is sensitive to

positive and negative edges. Depending on the

settings associated with this mode of operation, the

GP1 can detect positive, negative or both edges.

• sending/receiving data at a multitude of bit rates,

up to 400 kbps

• 7-bit Addressing mode

• single data transfers of up to 65,535 bytes

• clock-stretching (it allows the slower I²C Slaves to

communicate)

1.11 RESET/POR

1.11.1

RESET PIN

All the user data to be sent/transmitted over the I²C bus

is conveyed to the USB host only through the USB HID

interface.

The RST pin provides a method for triggering an

external Reset of the device. A Reset is generated by

holding the pin low. These devices have a noise filter in

the Reset path, which detects and ignores small

pulses.

1.14 Bus Matrix Module

The Bus Matrix module manages the communication

between various functional modules, such as: USB

(HID and CDC), I²C, UART, GPIO/ADC/DAC, Config,

IOC, CLKR, Pin Mux.

1.11.2

POR

A POR pulse is generated on-chip whenever VDD rises

above a certain threshold. This allows the device to

start in the initialized state when VDD is adequate for

operation.

1.15 Config Module

To take advantage of the POR circuitry, tie the RST pin

to VDD through a resistor (1 – 10 k). This will

eliminate external RC components usually needed to

create a POR delay.

The Config module is in charge of the storage of the

device settings and also of their management

(loading/modifying/access protection). The module

uses non-volatile memory for storing the Power-Up

device settings.

When the device starts normal operation (i.e., exits the

Reset condition), device operating parameters

(voltage, frequency, temperature, etc.) must be met to

ensure operation. If these conditions are not achieved,

the device must be held in Reset until the operating

conditions are met.

At Power-Up, the module loads the settings from the

non-volatile storage area into an SRAM location

(volatile settings). These settings represent the

device’s configuration, along with other key parameters

(e.g., string descriptors, VID/PID, etc.). After the

settings are loaded in SRAM (volatile settings), they

can be changed through the USB HID interface.

1.12 Internal Oscillator

The MCP2221 features an internal oscillator that

provides a 12 MHz clock, which is needed for the USB

modules (HID and CDC).

The user can read/modify/change either settings

(nonvolatile or volatile) through the same interface

(USB HID).

Full-speed USB is nominally 12 Mb/s. The clock

signal’s accuracy is over temp (2,500 ppm maximum).

The Config module contains the relevant Power-Up

settings that are used by the MCP2221. A few

examples of settings are: USB descriptors, GP

settings, ADC, DAC, CLKR.

The internal clock of the MCP2221 is fed into the CLKR

module to provide a clock signal outside of the device.

GP1 can be configured as a clock output pin providing

a 12 MHz clock to the rest of the system. Other clock

and duty-cycle values are possible by using different

settings for this module.

 2015 Microchip Technology Inc.

DS20005292B-page 21

MCP2221

The case with no serial number is useful for

test/validation of products using the MCP2221. The

fact that all the tested boards are not supplying a serial

number will force Windows to assign them the same

COM port number (but only if connected to the same

USB port).

2.0

USB ENUMERATION PROCESS

The MCP2221 implements the CDC class to support

the USB-to-UART protocol converter functionality.

Using USB-to-UART (CDC class) adapters with

personal computers running the Windows operating

system (OS) requires some consideration because of

the way the Windows OS responds to their connection.

The MCP2221 is factory-set to not use a serial number.

Later in the process, if a customer wants the benefits

provided by using a serial number, the Configuration

Utility from Microchip can be used to enable the

MCP2221 to enumerate its serial number as well.

When

a USB-to-UART (CDC class) adapter is

connected to the USB port of the PC, Windows

searches for a driver. After a suitable driver is found,

the system creates an entry in the registry. The entry

stores relevant information about the USB-to-UART

adapter, its driver and the associated COM port.

The MCP2221 comes with a uniquely-provided serial

number to be used during the USB enumeration

process; however, this can be changed by the user in

the Configuration Utility.

The COM port and its number are legacy-type

adapters, which are still supported by Windows OS.

Historically, the COM ports in a computer are part of the

computer’s motherboard and are assigned a different

index number. With the advent of USB-to-UART

adapters, the Windows OS kept the COM port concept

and extended it to support the USB adapters.

The serial number enumeration enable/disable can be

changed, as well, using the Configuration Utility.

All the USB-related settings mentioned above are part

of the Device Configuration (Chip Settings area) and

they reside only in Flash. When the Chip Settings area

(1^starea) is being copied into the SRAM (at Power-Up),

the USB settings are skipped (not copied into SRAM).

Whenever a USB-to-UART adapter is first connected to

a PC, the system searches the registry for an entry that

is suitable for the connected adapter. If one is not

found, the system asks for a suitable driver. If this step

is completed, it creates a registry entry, and assigns a

COM port number as well. Then, whenever the

USB-to-UART adapter is connected to that PC, the

system checks the registry entry, loads the specified

driver and assigns the given COM port number (as

found in the registry entry).

During the enumeration process, the device can

specify a serial number. If it does, this number is stored

in the registry entry and it is used to assign the same

COM port number to the adapter in question, no matter

which USB port the adapter is connected to.

USB-to-UART adapters have the option to not present

a serial number during USB enumeration. In this case,

the operating system would not be able to differentiate

between two identical devices, if neither is providing its

serial number. Each time one of these two devices

(with no serial number provided during enumeration) is

connected to the same USB port, they will have the

same COM port number assigned.

Both functionalities (with or without serial numbers) are

very useful for different applications.

When the serial number is provided, an adapter using

the MCP2221 solution receives the same COM port

number from a Windows machine, no matter which

USB port they are connected to.

DS20005292B-page 22

 2015 Microchip Technology Inc.

MCP2221

3.0

USB HID COMMUNICATION

Except for the USB CDC and UART modules, all the

other modules in the MCP2221 use USB HID protocol

for communication.

The USB HID protocol uses 64-byte reports.

A typical command exchange starts with a 64-byte

packet that is written by the USB Host (i.e., the PC).

Afterward, the USB Host reads the response from the

device as a 64-byte packet.

3.1

USB HID Commands/Responses

3.1.1

STATUS/SET PARAMETERS

This command offers many options for this device. It is

used to poll for the status of the device. It is also used

to establish certain I²C bus parameters/conditions.

TABLE 3-1:

COMMAND STRUCTURE

Byte

Index

Function Description

Value

Effect

0

0x10

Any value

0x10

Status/Set Parameters – command code

1

2

Don’t care

Cancel current I²C/SMBus

transfer (sub-command)

When this value is put in this field, the device will cancel the

current I²C/SMBus transfer and will attempt to free the I²C bus.

This command is very useful since it can cancel a transfer and

free the bus. An example would be when trying to communicate

with a device using a wrong address. This will cause a timeout

to occur. This timeout situation can be read using the

“Status/Set Parameter” and the cancellation of the I²C/SMBus

transfer can be achieved by this sub-command.

Any other No effect.

value

3

4

Set I²C/SMBus communication

speed (sub-command)

0x20

When this value is put in this field, the device will take the next

command field and interpret it as the system clock divider that

will give the I²C/SMBus communication clock.

Any other No effect.

value

The I²C/SMBus system clock

divider that will be used to

establish the communication

speed

The value in this field is being taken into consideration only

when the Byte Index 3 contains the code for establishing a new

communication speed. In all the other cases, this field’s value

won’t matter.

5-63 Don’t care

Any value

 2015 Microchip Technology Inc.

DS20005292B-page 23

MCP2221

3.1.1.1

Responses

RESPONSE 1 STRUCTURE

TABLE 3-2:

Byte

Index

Function Description

Value

Effect

0

1

0x10

0x00

Status/Set Parameters – command code echo

Command completed successfully

No special operation (i.e., Cancel current I²C/SMBus

2

Cancel transfer

transfer)

0x10

The current I²C/SMBus transfer was marked for

cancellation. The actual I²C/SMBus transfer cancellation

and bus release will need some time (a few hundreds of

microseconds, depending on the communication speed

initially chosen for the canceled transfer)

0x11

The I²C engine (inside MCP2221) was already in Idle

mode. The cancellation command had no effect.

3

4

0x00

0x20

No Set I²C/SMBus communication speed was issued.

The new I²C/SMBus communication speed is now

considered.

0x21

The I²C/SMBus communication speed was not set

(e.g., I²C transfer in progress).

The divider Only in the case when the code for establishing a new

value given communication speed is given at Byte Index 3.

at the same

index in the

command

field

0x00

When the communication speed is not being set.

5-7

8

Don’t care

Internal I²C state machine state

Any value

value

9

Lower byte (16-bit value) of the

requested I²C transfer length

10

11

Higher byte (16-bit value) of the

requested I²C transfer length

Lower byte (16-bit value) of the

already transferred (through I²C)

number of bytes

12

Higher byte (16-bit value) of the

already transferred (through I²C)

number of bytes

13

14

Internal I²C data buffer counter

Current I²C communication

speed divider value

15

16

Current I²C timeout value

Lower byte (16-bit value) of the

I²C address being used

17

Higher byte (16-bit value) of the

I²C address being used

18-21 Don’t care

22 SCL line value –

as read from the pin

Any value

DS20005292B-page 24

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-2:

RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Index

Function Description

Value

Effect

23

SDA line value –

as read from the pin

24

25

Interrupt edge detector state

I²C Read pending value

0 or 1

0, 1 or 2

This field is used by the USB host to know if the MCP2221

still has to read from a slave device.

26-45 Don’t care

Any value

46

47

48

49

MCP2221 Hardware Revision

Major (‘A’)

MCP2221 Hardware Revision

Minor (‘6’)

MCP2221 Firmware Revision

Major (‘1’)

MCP2221 Firmware Revision

Minor (‘1’)

50-55 ADC Data (16-bit) values.

56-63 Don’t care

3 x (16-bit) little-endian ADC channel values (CH0 LSB,

CH0 MSB, CH1 LSB, CH1 MSB, CH2 LSB, CH2 MSB).

Any value

 2015 Microchip Technology Inc.

DS20005292B-page 25

MCP2221

3.1.2

READ FLASH DATA

This command is used to read various important data

structures and strings that are stored in Flash memory

on the MCP2221.

TABLE 3-3:

COMMAND STRUCTURE

Function Description

Byte

Index

Value

Effect

0

0xB0

0x00

Read Flash Data – command code

1

Read Flash Data Sub-code.

The value in this field will instruct

the MCP2221 on what Flash

data to be read.

Read Chip Settings – it will read the MCP2221 flash

settings

0x01

0x02

Read GP Settings – it will read the MCP2221 flash GP

settings

Read USB Manufacturer Descriptor String – reads the

USB Manufacturer String Descriptor used during the USB

enumeration

0x03

0x04

Read USB Product Descriptor String – reads the USB

Product String Descriptor used during the USB

enumeration

Read USB Serial Number Descriptor String – reads the

USB Serial Number String Descriptor that is used during

USB enumeration. This serial number can be changed by

the user through a specific USB HID command.

0x05

Read Chip Factory Serial Number – reads the factory-set

serial number. This serial number cannot be changed.

Any other

value

No meaning. The device will reply with a code for an

unsupported command at Byte Index 1 in the Response

report.

2-63 Reserved

0x00

3.1.2.1

Responses

RESPONSE STRUCTURE

TABLE 3-4:

Byte

Index

Function Description

Value

Effect

0

1

0xB0

0x00

0x01

Read Flash Data – command code

Command completed successfully

Command not supported

2

Data structure length or

Don’t care

3-63 Data or Don’t care

Depends on the issued sub-command or the returned

code at Byte Index 1

DS20005292B-page 26

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-5:

RESPONSE STRUCTURE – READ CHIP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

0

1

0xB0

0x00

Read Flash Data – command code echo

Command completed successfully

2

3

4

Structure length

Don’t care

Bit 7: CDC Serial Number

Enumeration Enable

1

0

The USB serial number will be used during the USB

enumeration of the CDC interface.

No serial number descriptor will be presented during the

USB enumeration.

Bit 6: Initial value for LEDUARTRX

pin option

This value represents the logic level signaled when no

UART RX activity takes places. When the UART RX (of the

MCP2221) is receiving data, the LEDUARTRX pin will take

the negated value of this bit.

Bit 5: Initial value for LEDUARTTX

pin option

This value represents the logic level signaled when no

UART TX transmission takes place. When the UART TX (of

the MCP2221) is sending data, the LEDUARTTX pin will

take the negated value of this bit.

Bit 4: Initial value for LEDI2C pin

option

This value represents the logic level signaled when no I²C

traffic occurs. When the I²C traffic is active, the LEDI2C pin

(if enabled) will take the negated value of this bit.

Bit 3: Initial value for SSPND pin

option

This value represents the logic level signaled when the

device is not in Suspend mode. Upon entering Suspend

mode, the SSPND pin (if enabled) will take the negated

value of this bit.

Bit 2: Initial value for USBCFG pin

option

This value represents the logic level signaled when the

device is not USB configured. When the device will be USB

configured, the USBCFG pin (if enabled) will take the

negated value of this bit.

Bits 1-0: Chip configuration security

option

11-10 Permanently locked

01

00

Password-protected

Unsecured

5

6

Bits 7-5

Don’t

care

Bits 4-0: Clock Output divider value

If the GP pin (exposing the clock output) is enabled for

clock output operation, the divider value will be used on the

48 MHz USB internal clock and its divided output will be

sent to this pin.

Bits 7-6: DAC Reference voltage

option

11

Reference voltage is 4.096V (only if VDD is above this

voltage)

10

01

00

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in which

the DAC uses other reference than VRM DAC; e.g., VDD)

Bit 5: DAC reference option

1

0

DAC reference is VRM DAC voltage

DAC reference is VDD

Bits 4-0: Power-Up DAC value

 2015 Microchip Technology Inc.

DS20005292B-page 27

MCP2221

TABLE 3-5:

RESPONSE STRUCTURE – READ CHIP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description

Value

Effect

7

Bit 7

Don’t

care

Bit 6: Interrupt detection – negative

edge

If set, the interrupt detection flag will be set when a

negative edge occurs.

Bit 5: Interrupt detection – positive

edge

If set, the interrupt detection flag will be set when a positive

edge occurs.

Bit 4-3: ADC Reference Voltage

11

Reference voltage is 4.096V (only if VDD is above this

voltage)

10

01

00

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in which

the ADC uses other reference than VRM ADC; e.g., VDD)

Bit 2

1

0

DAC reference is VDD DAC voltage

DAC reference is VRM

Bit 1

Bit 0

Don’t

care

Don’t

care

8

9

Lower byte of the 16-bit USB VID

value

Higher byte of the 16-bit USB VID

value

10 Lower byte of the 16-bit USB PID

value

11

Higher byte of the 16-bit USB PID

value

12 USB power attributes⁽¹⁾

This value will be used by the MCP2221’s USB

Configuration Descriptor (power attributes value) during the

USB enumeration.

13 USB requested number of mA(s)⁽¹⁾

14-63 Don’t care

The requested mA value during the USB enumeration will

represent the value at this index multiplied by 2.

Note 1: Please consult the USB 2.0 specification for details on the correct values for power and attributes

DS20005292B-page 28

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-6:

RESPONSE STRUCTURE – READ GP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

0

1

2

3

0xB0

0x00

Read Flash Data – command code echo

Command completed successfully

Structure length

Don’t

care

4

GP0 Power-Up Settings

Bit 7-5:

Don’t

care

Bit 4: GPIO Output value

When GP0 is set as an output GPIO, this value will be

present at the GP0 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP0 is set for GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation

111-011 Don’t care

010

001

000

Alternate function 0 (LED UART RX)

Dedicated function operation (SSPND)

GPIO operation

5

GP1 Power-Up Settings

Bits7-5:

Don’t

care

Bit 4: GPIO Output value

When GP1 is set as an output GPIO, this value will be

present at the GP1 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP0 is set for GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-101 Don’t care

001

100

011

010

000

Dedicated function operation (Clock Output)

Alternate function 2 (Interrupt Detection)

Alternate function 1 (LED UART TX)

Alternate function 0 (ADC1)

GPIO operation

6

GP2 Power-Up Settings

Bits7-5:

Don’t

care

Bit 4: GPIO Output value

When GP2 is set as an output GPIO, this value will be

present at the GP2 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP2 is set for GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-100 Don’t care

011

010

001

000

Alternate function 1 (DAC1)

Alternate function 0 (ADC2)

Dedicated function operation (USB)

GPIO operation

 2015 Microchip Technology Inc.

DS20005292B-page 29

MCP2221

TABLE 3-6:

RESPONSE STRUCTURE – READ GP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Index

Function Description

Value

Effect

7

GP3 Power-Up Settings

Bits7-5:

Don’t

care

Bit 4: GPIO Output value

When GP3 is set as an output GPIO, this value will be

present at the GP3 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP3 is set for GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-100 Don’t care

011

010

001

000

Alternate function 1 (DAC2)

Alternate function 0 (ADC3)

Dedicated function operation (LED I2C)

GPIO operation

8-63

Don’t

care

TABLE 3-7:

RESPONSE STRUCTURE – READ USB MANUFACTURER DESCRIPTOR STRING

SUB-COMMAND

Byte Index

Value

Effect

0

1

2

0xB0 Read Flash Data – command code echo

0x00 Command completed successfully

(2)

Number of bytes + 2 in the provided USB Manufacturer

Descriptor String. The actual String starts at Byte Index 4.

0x03 The value at this index must always be 0x03.

Lower byte of the 16-bit Unicode character.

3

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

(4 + 2 x Unicode_char_number + 2) - 63⁽¹⁾

Higher byte of the 16-bit Unicode character.

Don’t care. Only if the USB string descriptor is less than 60-bytes

long in total.

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-8:

RESPONSE STRUCTURE – READ USB PRODUCT DESCRIPTOR STRING

SUB-COMMAND

Byte Index

Value

Effect

0

1

2

0xB0 Read Flash Data – command code echo

0x00 Command completed successfully

(2)

Number of bytes + 2 in the provided USB Product Descriptor

String. The actual String starts at Byte Index 4.

0x03 The value at this index must always be 0x03

Lower byte of the 16-bit Unicode character.

3

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

(4 + 2 x Unicode_char_number + 2) - 63⁽¹⁾

Higher byte of the 16-bit Unicode character.

Don’t care. Only if the USB string descriptor is less than

60-bytes long (in total).

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

DS20005292B-page 30

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-9:

RESPONSE STRUCTURE – READ USB SERIAL NUMBER DESCRIPTOR STRING

SUB-COMMAND

Byte Index

Value

Effect

0

1

2

0xB0 Read Flash Data – command code echo

0x00 Command completed successfully

(2)

The number of bytes + 2 in the provided USB Serial Number

Descriptor String.

The actual String starts at Byte Index 4

3

0x03 The value at this index must always be 0x03

Lower byte of the 16-bit Unicode character

Higher byte of the 16-bit Unicode character

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

(4 + 2 x Unicode_char_number + 2) - 63⁽¹⁾

Don’t care.

Only if the USB string descriptor is less than 60-bytes long in

total.

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-10: RESPONSE STRUCTURE – READ CHIP FACTORY SERIAL NUMBER

SUB-COMMAND⁽¹⁾

Byte Index

Value

Effect

0

1

2

3

0xB0 Read Flash Data – command code echo

0x00 Command completed successfully

Structure length

Don’t

care

4 - (4 + Structure length - 1)

(4 + Structure length) - 63

Structure data – Factory Serial Number String

Don’t

care

Note 1: The Chip Serial Number is typically 8 bytes in length.

 2015 Microchip Technology Inc.

DS20005292B-page 31

MCP2221

3.1.3

WRITE FLASH DATA

This command is used to write various important data

structures and strings into the Flash memory of the

device.

TABLE 3-11: COMMAND STRUCTURE

Byte

Function Description

Value

Effect

Index

0

1

0xB1 Write Flash Data – command code

Write Flash Data Sub-code. The value in

this field will instruct the MCP2221 about

the particular Flash settings to be altered.

0x00 Write Chip Settings – it will write the MCP2221 flash

settings

0x01 Write GP Settings – it will write the MCP2221 flash GP

settings

0x02 Write USB Manufacturer Descriptor String – writes the

USB Manufacturer String Descriptor used during the

USB enumeration

0x03 Write USB Product Descriptor String – writes the USB

Product String Descriptor used during the USB

enumeration

0x04 Write USB Serial Number Descriptor String – writes the

USB Serial Number String Descriptor used during the

USB enumeration

Any

No meaning. The device will reply with a code for an

other unsupported command at Byte Index 1 in the response

value report.

2-63 Data to be written

Data format depends on the Write Flash Data Sub-code

(at Byte Index 1).

DS20005292B-page 32

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-12: SUB-COMMAND STRUCTURE – WRITE CHIP SETTINGS SUB-COMMAND

Byte

Index

Value

Function Description

Effect

0

1

0xB1 Write Flash Data – command code

0x00 Write Chip Settings – it will write the MCP2221 flash device

settings

2

Bit 7: CDC Serial Number

Enumeration Enable.

1

The USB serial number will be used during the USB enumeration

of the CDC interface.

0

No serial number descriptor will be presented during the USB

enumeration.

Bit 6: Initial value for

LEDUARTRX pin option

This value represents the logic level signaled when no UART RX

activity takes places. When the UART RX (of the MCP2221) is

receiving data, the LEDUARTRX pin will take the negated value

of this bit.

Bit 5: Initial value for

LEDUARTTX pin option

This value represents the logic level signaled when no UART TX

transmission takes place. When the UART TX (of the MCP2221)

is sending data, the LEDUARTTX pin will take the negated value

of this bit.

Bit 4: Initial value for LEDI2C pin

option

This value represents the logic level signaled when no I²C traffic

occurs. When I²C traffic is active, the LEDI2C pin (if enabled) will

take the negated value of this bit.

Bit 3: Initial value for SSPND pin

option

This value represents the logic level signaled when the device is

not in Suspend mode. Upon entering Suspend mode, the

SSPND pin (if enabled) will take the negated value of this bit.

Bit 2: Initial value for USBCFG

pin option

This value represents the logic level signaled when the device is

not USB configured. When the device will be USB-configured,

the USBCFG pin (if enabled) will take the negated value of this

bit.

Bit 1-0: Chip Configuration

Security Option

11-10 Permanently locked

01

00

Password-protected

Unsecured

3

4

Bit 7-5

Don’t

care

Bit 4-0: Clock Output divider

value

If the GP pin (exposing the clock output) is enabled for clock

output operation, the divider value will be used on the 48 MHz

USB internal clock and its divided output will be sent to this pin.

Bit 7-6: DAC Reference voltage

option

11

10

01

00

Reference voltage is 4.096V (only if VDD is above this voltage)

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in which the

DAC uses other reference than VRM DAC, i.e., VDD)

Bit 5: DAC reference option

Bit 4-0: Power-Up DAC value

1

0

DAC reference is VDD

DAC reference is VRM DAC voltage

 2015 Microchip Technology Inc.

DS20005292B-page 33

MCP2221

TABLE 3-12: SUB-COMMAND STRUCTURE – WRITE CHIP SETTINGS SUB-COMMAND

Byte

Index

Value

Function Description

Effect

5

Bit 7

Don’t

care

Bit 6: Interrupt detection –

negative edge

If set, the interrupt detection flag will be set when a negative

edge occurs.

Bit 5: Interrupt detection –

positive edge

If set, the interrupt detection flag will be set when a positive edge

occurs.

Bit 4-3: ADC Reference Voltage

11

10

01

00

Reference voltage is 4.096V (only if VDD is above this voltage).

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in which the

ADC uses other reference than VRM ADC; e.g., VDD)

Bit 2: ADC Reference Option

1

0

ADC reference voltage is VRM ADC

ADC reference voltage is VDD

Bit 1

Bit 0

Don’t

care

Don’t

care

6

7

8

9

Lower byte of the 16-bit USB VID

value.

Higher byte of the 16-bit USB

VID value.

Lower byte of the 16-bit USB PID

value.

Higher byte of the 16-bit USB

PID value.

10 USB power attributes

This value will be used by the MCP2221’s USB Configuration

Descriptor (power attributes value) during the USB enumeration.

11 USB requested number of mA(s)

The requested mA value during the USB enumeration will

represent the value at this index multiplied by 2.

12-19 8-bytes password (for Flash

modifications protection)

20-63

Don’t

care

DS20005292B-page 34

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-13: SUB-COMMAND STRUCTURE – WRITE GP SETTINGS SUB-COMMAND

Byte

Index

Function Description

Value

Effect

0

1

0xB1

0x01

Write Flash Data – command code

Write GP Settings – it will write the MCP2221 flash GP

settings

2

GP0 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP0 is set as an output GPIO, this value will be

present at the GP0 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP0 is set for GPIO operation.

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation

111-011

010

Don’t care

Dedicated function operation (SSPND)

Alternate function 0 (LED UART RX)

GPIO operation

001

000

3

GP1 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP1 is set as an output GPIO, this value will be

present at the GP1 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP1 is set for GPIO operation.

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-101

100

Don’t care

Alternate function 2 (Interrupt Detection)

Alternate function1 (LED UART TX)

Alternate function 0 (ADC1)

Dedicated function operation (Clock Output)

GPIO operation

011

010

001

000

4

GP2 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP2 is set as an output GPIO, this value will be

present at the GP2 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP2 is set for GPIO operation.

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP2 Designation

111-100

011

Don’t care

Alternate function1 (DAC1)

Alternate function 0 (ADC2)

Dedicated function operation (Clock Output)

GPIO operation

010

001

000

 2015 Microchip Technology Inc.

DS20005292B-page 35

MCP2221

TABLE 3-13: SUB-COMMAND STRUCTURE – WRITE GP SETTINGS SUB-COMMAND (CONTINUED)

Byte

Function Description

Value

Effect

Index

5

GP3 Power-Up Settings

Bit 7-5:

Don’t care

Bit 4: GPIO Output value

When GP3 is set as an output GPIO, this value will be

present at the GP2 pin at Power-Up/Reset.

Bit 3: GPIO Direction

(Input/Output) – Works only when

GP3 is set for GPIO operation.

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP3 Designation

111-100

011

Don’t care

Alternate function 1 (DAC2)

Alternate function 0 (ADC3)

Dedicated function operation (LED I2C)

GPIO operation

010

001

000

6-63

Don’t care

TABLE 3-14: SUB-COMMAND STRUCTURE – WRITE USB MANUFACTURER DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

Write Flash Data – command code

0

1

0xB1

0x02

Write USB Manufacturer Descriptor String – writes the USB

Manufacturer String Descriptor used during the USB enumeration

(2)

2

Number of bytes + 2 in the provided USB Serial Number Descriptor

String

3

0x03

The value at this index must always be 0x03.

Lower byte of the 16-bit Unicode character.

Higher byte of the 16-bit Unicode character.

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

TABLE 3-15: SUB-COMMAND STRUCTURE – WRITE USB PRODUCT DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

Write Flash Data – command code

0

1

0xB1

0x03

Write USB Product Descriptor String – writes the USB Product

String Descriptor used during the USB enumeration

(2)

2

Number of bytes + 2 in the provided USB Serial Number Descriptor

String. The actual String starts at Byte Index 4.

3

0x03

The value at this index must always be 0x03.

Lower byte of the 16-bit Unicode character

Higher byte of the 16-bit Unicode character

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

DS20005292B-page 36

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-16: SUB-COMMAND STRUCTURE – WRITE USB SERIAL NUMBER DESCRIPTOR

STRING SUB-COMMAND

Byte Index

Value

Effect

Write Flash Data – command code

0

1

0xB1

0x04

Write USB Serial Number Descriptor String – writes the USB Serial

Number String Descriptor used during the USB enumeration

(2)

2

Number of bytes + 2 in the provided USB Serial Number Descriptor

String. The actual String starts at Byte Index 4

3

0x03

The value at this index must always be 0x03.

Lower byte of the 16-bit Unicode character

Higher byte of the 16-bit Unicode character

4 + 2 x Unicode_char_number + 0⁽¹⁾

4 + 2 x Unicode_char_number + 1⁽¹⁾

Note 1: “Unicode_char_number” value starts from 0 to a maximum of 30 (included).

2: The value at Byte Index 2 must be 2 + 2 x (number of Unicode characters in the string).

3.1.3.1

Responses

TABLE 3-17: RESPONSE STRUCTURE – READ CHIP FACTORY SERIAL NUMBER

SUB-COMMAND

Byte

Index

Value

Effect

0

1

0xB1

0x00

Write Flash Data – command code

Command completed successfully

Command not supported

0x02

0x03

Command not allowed

2-63

Don’t care

 2015 Microchip Technology Inc.

DS20005292B-page 37

MCP2221

3.1.4

SEND FLASH ACCESS PASSWORD

This command is used to send a user-supplied

password that will be compared to the one stored in the

device’s Flash when Flash updates (Chip/GP

configuration, USB strings) are required and the Flash

data is password-protected.

In the case where no protection mechanism is in place

or the Flash data has been permanently locked, this

command has no meaning.

TABLE 3-18: COMMAND STRUCTURE

Byte

Value

Index

Effect

Send Flash Access Password – command code

0

1

0xB2

Don’t

care

2

Password byte 1

Password byte 2

Password byte 3

Password byte 4

Password byte 5

Password byte 6

Password byte 7

Password byte 8

Don’t care

3

4

5

6

7

8

9

10-63

3.1.4.1

Responses

TABLE 3-19: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

0

1

0xB2

0x00

0x03

Send Flash Access Password – command code echo

Command completed successfully

Command not allowed (when the number of failed Flash updates has been reached, no password

will be accepted)

2-63

Don’t

care

DS20005292B-page 38

 2015 Microchip Technology Inc.

MCP2221

3.1.5

I²C™ WRITE DATA

This command is used to write user-given data to the

I²C Slave device (the speed is specified by the

STATUS/SET Parameters command).

The command will have the following effects:

• The I²C engine will send the “START” condition.

• The selected I²C slave address is sent next and

the I²C engine will wait for the slave to send an

acknowledge bit.

• The user data follows next and the I²C engine

awaits for the acknowledge bit from the slave.

• If the requested length is more than 60 bytes,

subsequent user bytes will be sent on the bus.

• When the user data length (being sent on the bus)

reaches the requested length, the I²C engine will

send the “STOP” condition on the bus.

TABLE 3-20: COMMAND STRUCTURE⁽¹⁾

Byte

Value

Index

Effect

I²C Write Data – command code

0

0x90

1

2

3

Low Byte Requested I²C transfer length – 16-bit value – low byte

High Byte Requested I²C transfer length – 16-bit value – high byte

I²C Slave 8-bit value representing the I²C slave address to communicate with (even – address to write,

Address odd – address to read) (Note 2)

4-63

User data to be sent to the selected I²C slave device

Note 1: When the requested transfer length is more than 60 bytes, subsequent “I²C Write Data” commands will

transport the reminder of the user data (till the requested length).

2: The I²C slave address is represented on 8 bits, with even values for writes and odd for reads. To get the

8-bit address value out of a 7-bit address, the 7-bit value needs to be shifted left by 1 position. For write

operations use the shifted value, while for reads add 1 to the shifted value.

3.1.5.1

Responses

TABLE 3-21: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

0

1

0x90

0x00

0x01

I²C Write Data – command code echo

Command completed successfully

I²C Engine is busy (command not completed)

2

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the

status of the I²C Engine

3-63

Don’t

care

 2015 Microchip Technology Inc.

DS20005292B-page 39

MCP2221

• The user data follows next and the I²C engine

waits for the acknowledge bit from the slave.

3.1.6

I²C™ WRITE DATA

REPEATED-START

• If the requested length is more than 60 bytes,

subsequent user bytes will be sent on the bus.

This command is used to write user-given data to the

I²C Slave device (the speed is specified by the

STATUS/SET Parameters command).

• When the user data length (being sent on the bus)

reaches the requested length, the I²C engine will

send the “STOP” condition on the bus.

The command will have the following effects:

• The I²C engine will send the “Repeated-START”

condition.

• The selected I²C slave address is sent next and

the I²C engine will wait for the slave to send an

acknowledge bit.

TABLE 3-22: COMMAND STRUCTURE ⁽¹⁾

Byte

Value

Index

Effect

I²C Write Data Repeated-START – command code

(cI2C_CMD_RSTART_WRDATA7)

0

0x92

1

2

Low Byte Requested I²C transfer length –

16-bit value – low byte

High Byte Requested I²C transfer length –

16-bit value – high byte

3

I²C Slave 8-bit value representing the I²C slave address to communicate with (even – address to write,

Address odd – address to read) (Note 2)

4-63

User data to be sent to the selected I²C slave device

Note 1: When the requested transfer length is more than 60 bytes, subsequent “I²C Write Data Repeated-START”

commands will transport the reminder of the user data (till the requested length).

2: The I²C slave address is represented on 8 bits, with even values for writes and odd for reads. To get the

8-bit address value out of a 7-bit address, the 7-bit value needs to be shifted left by 1 position. For write

operations use the shifted value, while for reads add 1 to the shifted value.

3.1.6.1

Responses

TABLE 3-23: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

I²C Write Data Repeated-START – command code echo

(cI2C_CMD_RSTART_WRDATA7)

0

0x92

1

0x00

0x01

Command completed successfully

I²C Engine is busy

(command not completed)

2

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the

status of the I²C Engine

3-63

Don’t

care

DS20005292B-page 40

 2015 Microchip Technology Inc.

MCP2221

• The user data follows next and the I²C engine

waits for the acknowledge bit from the slave.

3.1.7

I²C™ WRITE DATA NO STOP

This command is used to write user-given data to the

I²C Slave device (the speed is specified by the

STATUS/SET Parameters command).

• If the requested length is more than 60 bytes,

subsequent user bytes will be sent on the bus.

• When the user data length (being sent on the bus)

reaches the requested length, the I²C engine will

not send the “STOP” condition on the bus.

The command will have the following effects:

• The I²C engine will send the “START” condition.

• The selected I²C slave address is sent next and

the I²C engine will wait for the slave to send an

acknowledge bit.

TABLE 3-24: COMMAND STRUCTURE ⁽¹⁾

Byte

Value

Index

Effect

I²C Write Data No STOP – command code

0

0x94

1

2

3

Low Byte Requested I²C transfer length – 16-bit value – low byte

High Byte Requested I²C transfer length – 16-bit value – high byte

I²C Slave 8-bit value representing the I²C slave address to communicate with (even – address to write,

Address odd – address to read) (Note 2)

4-63

User data to be sent to the selected I²C slave device

Note 1: When the requested transfer length is more than 60 bytes, subsequent “I²C Write Data No STOP” com-

mands will transport the reminder of the user data (till the requested length).

2: The I²C slave address is represented on 8 bits, with even values for writes and odd for reads. To get the

8-bit address value out of a 7-bit address, the 7-bit value needs to be shifted left by 1 position. For write

operations use the shifted value, while for reads add 1 to the shifted value.

3.1.7.1

Responses

TABLE 3-25: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

I²C Write Data No STOP – command code echo

0

1

0x94

0x00

0x01

Command completed successfully

I²C Engine is busy (command not completed)

2

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the

status of the I²C Engine

3-63

Don’t

care

 2015 Microchip Technology Inc.

DS20005292B-page 41

MCP2221

• The user data is read next and the I²C engine

sends the acknowledge bit to the slave.

3.1.8

I²C™ READ DATA

This command is used to read user-given data to the

I²C Slave device (the speed is specified by the

STATUS/SET Parameters command).

• If the requested length is more than 60 bytes,

subsequent user bytes will be read from the I²C

slave on the bus.

The command will have the following effects:

• The I²C engine will send the “START” condition.

• The selected I²C slave address is sent next and

the I²C engine will wait for the slave to send an

acknowledge bit.

• When the user data length (being sent on the bus)

reaches the requested length, the I²C engine will

send the “STOP” condition on the bus.

TABLE 3-26: COMMAND STRUCTURE

Byte

Value

Index

Effect

I²C Read Data – command code

0

0x91

1

2

3

Low Byte Requested I²C transfer length – 16-bit value – low byte

High Byte Requested I²C transfer length – 16-bit value – high byte

I²C Slave 8-bit value representing the I²C slave address to communicate with (even – address to write,

Address odd – address to read) (Note 1)

4-63

Don’t

care

Note 1: The I²C slave address is represented on 8 bits, with even values for writes and odd for reads. To get the

8-bit address value out of a 7-bit address, the 7-bit value needs to be shifted left by 1 position. For write

operations use the shifted value, while for reads add 1 to the shifted value.

3.1.8.1

Responses

TABLE 3-27: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

I²C Read Data – command code echo

Command completed successfully

I²C Engine is busy (command not completed)

0

1

0x91

0x00

0x01

2

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the I²C

Engine’s status

3-63

Don’t

care

DS20005292B-page 42

 2015 Microchip Technology Inc.

MCP2221

• The user data is read next and the I²C engine

sends the acknowledge bit to the slave.

3.1.9

I²C™ READ DATA

REPEATED-START

• If the requested length is more than 60 bytes,

subsequent user bytes will be read from the I²C

slave on the bus.

This command is used to read user-given data to the

I²C Slave device (the speed is specified by the

STATUS/SET Parameters command).

• When the user data length (being sent on the bus)

reaches the requested length, the I²C engine will

send the “STOP” condition on the bus.

The command will have the following effect:

• The I²C engine will send the “Repeated-START”

condition.

• The selected I²C slave address is sent next and

the I²C engine will wait for the slave to send an

acknowledge bit.

TABLE 3-28: COMMAND STRUCTURE

Byte

Value

Index

Effect

I²C Read Data Repeated-START – command code

0

0x93

1

2

3

Low Byte Requested I²C transfer length – 16-bit value – low byte

High Byte Requested I²C transfer length – 16-bit value – high byte

I²C Slave 8-bit value representing the I²C slave address to communicate with (even – address to write,

Address odd – address to read) (Note 1)

4-63

Don’t

care

Note 1: The I²C slave address is represented on 8 bits, with even values for writes and odd for reads. To get the

8-bit address value out of a 7-bit address, the 7-bit value needs to be shifted left by 1 position. For write

operations use the shifted value, while for reads add 1 to the shifted value.

3.1.9.1

Responses

TABLE 3-29: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

0

0x93

0x00

0x01

I²C Read Data Repeated-START – command code echo

Command completed successfully

I²C Engine is busy (command not completed)

1

2

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the

status of the I²C Engine

3-63

Don’t

care

 2015 Microchip Technology Inc.

DS20005292B-page 43

MCP2221

3.1.10

I²C READ DATA – GET I²C DATA

This command is used to read back the data from the

I²C Slave device.

TABLE 3-30: COMMAND STRUCTURE

Byte

Value

Index

Effect

I²C Read Data – Get I²C Data – command code

0

0x40

1-63

Don’t

care

3.1.10.1

Responses

TABLE 3-31: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

I²C Read Data – Get I²C Data – command code echo

Command completed successfully

Error reading the I²C slave data from the I²C engine

0

1

0x40

0x00

0x41

2

3

Internal I²C Engine state (at the moment the command was issued) – useful for monitoring the I²C

Engine’s status

0-60

127

The number of read-back data bytes to follow in this packet: from 0 to a maximum of 60 bytes of

read-back bytes

This value is signaled when an error has occurred and the following data should not be taken into

account

4-63

User Data or Don’t care

DS20005292B-page 44

 2015 Microchip Technology Inc.

MCP2221

3.1.11

SET GPIO OUTPUT VALUES

This command is used to change the GPIO output

value for those GP pins assigned for GPIO operation

(GPIO outputs).

TABLE 3-32: COMMAND STRUCTURE

Byte

Index

Function

Description

Value

Effect

0

1

0x50

Set GPIO Output Values – command code

Don’t

care

2

3

4

5

6

7

8

9

Alter GP0 output

(enable/disable)

0x00

Do not modify GP0 output (if GP0 is set as GPIO output)

Any other The next byte (index 3) will be the value used to set GP0 output (only if

value

GP0 is set for GPIO output)

GP0 output value

0x00

GP0 (if set up for GPIO output operation) will take a logical value of ‘0’

Any other GP0 (if set up for GPIO output operation) will take a logical value of ‘1’

value

Alter GP0 pin direction

(enable/disable)

0x00

Leave the GP0 GPIO designation as is (input or output)

Any other The next byte (index 5) will be the value used to set GP0’s pin direction

value

0x00

(only if GP0 is set for GPIO operation)

Set GP0 GPIO as output

GP0 pin direction

(input or output)

Any other GP0 (if set up for GPIO operation) will be set as a digital input

value

Alter GP1 output

(enable/disable)

0x00

Do not modify GP1 output (if GP1 is set as GPIO output)

Any other The next byte (index 7) will be the value used to set GP1 output (only if

value

0x00

GP1 is set for GPIO output)

GP1 output value

GP1 (if set up for GPIO output operation) will take a logical value of ‘0’

Any other GP1 (if set up for GPIO output operation) will take a logical value of ‘1’

value

Alter GP1 pin direction

(enable/disable)

0x00

Leave the GP1 GPIO designation as is (input or output)

Any other The next byte (index 9) will be the value used to set GP1’s pin direction

value

0x00

(only if GP1 is set for GPIO operation)

Set GP1 GPIO as output

GP1 pin direction

(input or output)

Any other GP1 (if set up for GPIO operation) will be set as a digital input

value

10 Alter GP2 output

0x00

Do not modify GP2 output (if GP2 is set as GPIO output)

(enable/disable)

Any other The next byte (index 11) will be the value used to set GP2 output (only if

value

0x00

GP2 is set for GPIO output)

11

GP2 output value

The GP2 (if GP2 is set up for GPIO output operation) will take a logical

value of ‘0’

Any other GP2 (if GP2 is set up for GPIO output operation) will take a logical value

value

of ‘1’

12 Alter GP2 pin direction

(enable/disable)

0x00

Leave the GP2 GPIO designation as is (input or output)

Any other The next byte (index 13) will be the value used to set GP2’s pin direction

value

(only if GP2 is set for GPIO operation)

13 GP2 pin direction

(input or output)

0x00

Set GP2 GPIO as output

Any other GP2 (if set up for GPIO operation) will be set as a digital input

value

14 Alter GP3 output

(enable/disable)

0x00

Any other The next byte (index 11) will be the value used to set GP3 output (only if

value GP3 is set for GPIO output)

Do not modify GP3 output (if GP3 is set as GPIO output)

 2015 Microchip Technology Inc.

DS20005292B-page 45

MCP2221

TABLE 3-32: COMMAND STRUCTURE (CONTINUED)

Byte

Index

Function

Description

Value

Effect

15 GP3 output value

0x00

GP3 (if set up for GPIO output operation) will take a logical value of ‘0’.

Any other GP3 (if set up for GPIO output operation) will take a logical value of ‘1’

value

16 Alter GP3 pin direction

(enable/disable)

0x00

Leave the GP3 GPIO designation as is (input or output)

Any other The next byte (index 17) will be the value used to set GP3’s pin direction

value

0x00

(only if GP3 is set for GPIO operation)

Set GP3 GPIO as output

17 GP3 pin direction

(input or output)

Any other GP3 (if set up for GPIO operation) will be set as a digital input

value

18-63 Reserved

0x00

3.1.11.1

Responses

TABLE 3-33: RESPONSE 1 STRUCTURE

Byte

Index

Function

Description

Value

Effect

0

1

2

0x50

0x00

0xEE

Set GPIO Output Values – command code

Command completed successfully

If GP0 is not set for GPIO operation

Alter GP0 output

(enable/disable) status

Any other If GP0 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

3

4

5

6

7

8

9

GP0 output value status

0xEE

If GP0 is not set for GPIO operation

Any other If GP0 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

Alter GP0 pin direction

(enable/disable)

0xEE

If GP0 is not set for GPIO operation

Any other If GP0 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

GP1 pin direction

(input or output)

0xEE

If GP1 is not set for GPIO operation

Any other If GP1 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

Alter GP1 output

(enable/disable) status

0xEE

If GP1 is not set for GPIO operation

Any other If GP1 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

GP1 output value status

0xEE

If GP1 is not set for GPIO operation

Any other If GP1 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

Alter GP1 pin direction

(enable/disable)

0xEE

If GP1 is not set for GPIO operation

Any other If the GP1 is already set for GPIO operation, the value will be copied

value

from the same byte index in the command structure

GP1 pin direction

(input or output)

0xEE

If GP1 is not set for GPIO operation

Any other If GP1 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

10 Alter GP2 output

(enable/disable) status

0xEE

If GP2 is not set for GPIO operation

Any other If GP2 is already set for GPIO operation, the value will be copied from

value the same byte index in the command structure

DS20005292B-page 46

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-33: RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Index

Function

Description

Value

Effect

11

GP2 output value status

0xEE

If GP2 is not set for GPIO operation

Any other If GP2 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

12 Alter GP2 pin direction

(enable/disable)

0xEE

If GP2 is not set for GPIO operation

Any other If GP2 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

13 GP2 pin direction

(input or output)

0xEE

If GP2 is not set for GPIO operation

Any other If GP2 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

14 Alter GP3 output

(enable/disable) status

0xEE

If GP3 is not set for GPIO operation

Any other If GP3 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

15 GP3 output value status

0xEE

If GP3 is not set for GPIO operation

Any other If GP3 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

16 Alter GP3 pin direction

(enable/disable)

0xEE

If GP3 is not set for GPIO operation

Any other If GP3 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

17 GP3 pin direction

(input or output)

0xEE

If GP3 is not set for GPIO operation

Any other If GP3 is already set for GPIO operation, the value will be copied from

value

the same byte index in the command structure

18-63

Don’t

care

 2015 Microchip Technology Inc.

DS20005292B-page 47

MCP2221

3.1.12

GET GPIO VALUES

This command is used to retrieve the GPIO direction

and pin value for those GP pins assigned for GPIO

operation (GPIO inputs or outputs).

TABLE 3-34: COMMAND STRUCTURE

Byte

Value

Index

Effect

0

0x51

Get GPIO Values – command code

1-63

Don’t

care

3.1.12.1

Responses

TABLE 3-35: RESPONSE 1 STRUCTURE

Byte

Function

Value

Effect

Index Description

0

1

0x51

0x00

0xEE

Get GPIO Values – command code

Command completed successfully

If GP0 is not set for GPIO operation

2

GP0 pin value

Other values If GP0 is already set for GPIO operation, the value represents the GP0 logic

(0x00 or 0x01) pin value

3

GP0 direction

value

0xEF

If GP0 is not set for GPIO operation

Other values If GP0 is already set for GPIO operation, the value represents the GP0 pin

(0x00 or 0x01) designation (0x00 for output and 0x01 for input)

4

GP1 pin value

0xEE

If GP1 is not set for GPIO operation

Other values If GP1 is already set for GPIO operation, the value represents the GP1 logic

(0x00 or 0x01) pin value

5

GP1 direction

value

0xEF

If GP1 is not set for GPIO operation

Other values If GP1 is already set for GPIO operation, the value represents the GP1 pin

(0x00 or 0x01) designation (0x00 for output and 0x01 for input)

6

GP2 pin value

0xEE

If GP2 is not set for GPIO operation

Other values If GP2 is already set for GPIO operation, the value represents the GP2 logic

(0x00 or 0x01) pin value

7

8

GP2 direction

value

0xEF

If GP2 is not set for GPIO operation

Other values If GP2 is already set for GPIO operation, the value represents the GP2 pin

(0x00 or 0x01) designation (0x00 for output and 0x01 for input)

GP3 pin value

0xEE

If GP3 is not set for GPIO operation

Other values If GP3 is already set for GPIO operation, the value represents the GP3 logic

(0x00 or 0x01) pin value

9

GP3 direction

value

0xEF

If GP3 is not set for GPIO operation

Other values If GP3 is already set for GPIO operation, the value represents the GP3 pin

(0x00 or 0x01) designation (0x00 for output and 0x01 for input)

10-63

Don’t care

DS20005292B-page 48

 2015 Microchip Technology Inc.

MCP2221

3.1.13

SET SRAM SETTINGS

This command is used to alter various run time

chip-settings. The altered settings reside in SRAM

memory and they won’t affect the chip’s

Power-Up/Reset default settings. These altered

settings will be active till the next chip Power-Up/Reset.

TABLE 3-36: COMMAND STRUCTURE

Byte

Function Description

Value

Effect

Index

0

1

0x60

Set SRAM settings – command code

Don’t

care

2

Clock Output Divider value – this allows the user to modify the clock output value on the fly, at run-time

Bit 7: Enable loading of a

new clock divider

1

0

The 4-0 bits will be loaded into the clock divider

Clock divider value won’t be altered

Bit 6-5

Don’t

care

Bit 4-3: Duty cycle

00

01

10

11

0% duty cycle

25% duty cycle

50% duty cycle

75% duty cycle

Bit 2-0: Clock divider

value

3

DAC Voltage Reference – this allows the user to modify the DAC reference voltage

Bit 7: Enable loading of a

new DAC reference

1

0

Bits 2-0 will be used for DAC reference voltage selection

DAC reference will remain unaltered

Bit 6-3

Don’t

care

Bit 2-1: DAC VRM voltage

selection. These bits are

used to change the DAC

VRM voltage

11

10

01

00

1

VRM voltage is 4.096V (only if VDD is higher than this value)

VRM voltage is 2.048V

VRM voltage is 1.024V

VRM voltage is off

Bit 0: This bit is used to

change the DAC

DAC voltage reference is the internal DAC voltage reference module

(DAC VRM)

reference voltage

0

DAC voltage reference is VDD

4

Set DAC output value

Bit 7: Enable loading of a

new DAC value

1

0

Bits 4-0 will be used for DAC reference voltage selection

The current DAC value will remain unaltered

Bit 6-5

Don’t

care

Bit 4-0: The new DAC

value

 2015 Microchip Technology Inc.

DS20005292B-page 49

MCP2221

TABLE 3-36: COMMAND STRUCTURE (CONTINUED)

Byte

Function Description

Value

Effect

Index

5

ADC Voltage Reference – this allows the user to modify the ADC reference voltage

Bit 7: Enable loading of a

new ADC reference

1

0

Bits 2-0 will be used for ADC reference voltage selection

ADC reference will remain unaltered

Bit 6-3

Don’t

care

Bit 2-1: These bits are

used to change the DAC

VRM voltage

11

10

01

00

1

VRM voltage is 4.096V (only if VDD is higher than this value)

VRM voltage is 2.048V

VRM voltage is 1.024V

VRM voltage is off

Bit 0: This bit is used to

change the DAC

VDD ADC voltage reference is the internal ADC voltage reference

module (ADC VRM)

reference voltage

0

ADC voltage reference is V_DD

6

Setup the interrupt detection mechanism and clear the detection flag – useful for preparing the interrupt

detection module to detect a new interrupt condition

Bit 7: Enable the

modification of the

interrupt detection

conditions

1

0

The interrupt detection settings and flag will change

The interrupt detection settings and flag will remain unchanged

Bit 6-5

Don’t

care

Bit 4

Enable the modification of the positive edge detection

Interrupt detection will trigger on positive edges

Interrupt detection will not trigger on positive edges

Bit 3: The new value for

the positive edge

detector

1

0

Bit 2

Enable the modification of the negative edge detection

Interrupt detection will trigger on negative edges

Interrupt detection will not trigger on negative edges

Bit 1: The new value for

the negative edge

detector

1

0

Bit 0: Clear the interrupt

detection flag

1

0

1

Clear the interrupt detection flag

Leave the interrupt detection flag as is

7

8

Alter GPIO configuration:

alters the current GP

designation

Alter the GP designation. The values from Byte Index 8 will be used to

load a new set of values into the SRAM GP settings.

0

Do not alter the current GP designation

GP0 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When GP0 is set as an output GPIO, this value will be present at the

GP0 pin

Bit 3: GPIO Direction

(Input/Output) – Works

only when GP0 is set for

GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation 111-011 Don’t care

010

001

000

Alternate function 0 (LED UART RX)

Dedicated function operation (SSPND)

GPIO operation

DS20005292B-page 50

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-36: COMMAND STRUCTURE (CONTINUED)

Byte

Function Description

Value

Effect

Index

9

GP1 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When GP1 is set as an output GPIO, this value will be present at the

GP1 pin

Bit 3: GPIO Direction

(Input/Output) – Works

only when GP1 is set for

GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation 111-101 Don’t care

100

011

010

001

000

Alternate function 2 (Interrupt Detection)

Alternate function 1 (LED UART TX)

Alternate function 0 (ADC1)

Dedicated function operation (Clock Output)

GPIO operation

10 GP2 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When GP2 is set as an output GPIO, this value will be present at the

GP2 pin

Bit 3: GPIO Direction

(Input/Output) – Works

only when GP2 is set for

GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP2 Designation 111-100 Don’t care

011

010

001

000

Alternate function 1 (DAC1)

Alternate function 0 (ADC2)

Dedicated function operation (USBCFG)

GPIO operation

11

GP3 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When GP3 is set as an output GPIO, this value will be present at the

GP3 pin

Bit 3: GPIO Direction

(Input/Output) – Works

only when GP3 is set for

GPIO operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP3 Designation 111-100 Don’t care

011

010

001

000

0x00

Alternate function 1 (DAC2)

Alternate function 0 (ADC3)

Dedicated function operation (LED I2C)

GPIO operation

12-63 Reserved

 2015 Microchip Technology Inc.

DS20005292B-page 51

MCP2221

3.1.13.1

Responses

TABLE 3-37: RESPONSE 1 STRUCTURE

Byte

Value

Index

Effect

0

1

0x60

0x00

Set SRAM Settings – command code echo

Command completed successfully

2-63

Don’t

care

DS20005292B-page 52

 2015 Microchip Technology Inc.

MCP2221

3.1.14

GET SRAM SETTINGS

This command is used to retrieve the run time Chip and

GP settings.

TABLE 3-38: COMMAND STRUCTURE

Byte

Value

Index

Effect

0

0x61

0x00

Get SRAM Settings – command code echo

Command completed successfully

1-63

3.1.14.1

Responses

TABLE 3-39: RESPONSE 1 STRUCTURE

Byte

Function Description

Index

Value

Effect

0

1

0x61

0x00

Get SRAM Settings – command code echo

Command completed successfully

2

3

4

Length in bytes of the SRAM

Chip-settings area.

Length in bytes of the SRAM GP

settings area.

Bit 7: CDC Serial Number Enumeration

Enable

1

0

The USB serial number will be used during the USB

enumeration of the CDC interface

No serial number descriptor will be presented during

the USB enumeration

Bit 6: Initial value for LEDUARTRX pin

option

This value represents the logic level signaled when no

UART RX activity takes places. When the UART RX (of

the MCP2221) is receiving data, the LEDUARTRX pin

will take the negated value of this bit.

Bit 5: Initial value for LEDUARTTX pin

option.

This value represents the logic level signaled when no

UART TX transmission takes place. When the UART

TX (of the MCP2221) is sending data, the LEDUARTTX

pin will take the negated value of this bit.

Bit 4: Initial value for LEDI2C pin option

Bit 3: Initial value for SSPND pin option

This value represents the logic level signaled when no

I²C traffic occurs. When I²C traffic is active, the LEDI2C

pin (if enabled) will take the negated value of this bit.

This value represents the logic level signaled when the

device is not in Suspend mode. Upon entering Suspend

mode, the SSPND pin (if enabled) will take the negated

value of this bit.

Bit 2: Initial value for USBCFG pin

option

This value represents the logic level signaled when the

device is not USB configured. When the device will be

USB-configured, the USBCFG pin (if enabled) will take

the negated value of this bit.

Bit 1-0: Chip configuration security

option

10

01

00

Permanently locked

Password-protected

Unsecured

 2015 Microchip Technology Inc.

DS20005292B-page 53

MCP2221

TABLE 3-39: RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Function Description

Value

Effect

Index

5

Bit 7-5

Don’t

care

Bit 4-0: Clock Output divider value

If the GP pin (exposing the clock output) is enabled for

clock output operation, the divider value will be used on

the 48 MHz USB internal clock and its divided output

will be sent to this pin. (Bits 4-3 for duty cycle and bits

2-0 for the clock divider.)

6

Bit 7-6: DAC Reference voltage option

11

10

01

00

Reference voltage is 4.096V

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in

which the DAC uses other reference than VRM DAC;

e.g., VDD)

Bit 5: DAC reference option

1

0

DAC reference is VRM DAC voltage

DAC reference is VDD

Bit 4-0: Power-Up DAC value

Bit 7

7

Don’t

care

Bit 6: Interrupt detection – negative

edge

If set, the interrupt detection flag will be set when a

negative edge occurs

Bit 5: Interrupt detection – positive edge

If set, the interrupt detection flag will be set when a

positive edge occurs

Bit 4-3: ADC Reference Voltage

11

Reference voltage is 4.096V (only if VDD is above this

voltage)

10

01

00

Reference voltage is 2.048V

Reference voltage is 1.024V

Reference voltage is off (this is useful for the case in

which the ADC uses other reference than VRM DAC;

e.g., VDD)

Bit 2: ADC Reference Option

1

0

ADC reference is VRM ADC

ADC reference is VDD

Bit 1

Bit 2

Don’t

care

Don’t

care

8

9

Lower byte of the 16-bit USB VID value

Higher byte of the 16-bit USB VID value

10 Lower byte of the 16-bit USB PID value

11 Higher byte of the 16-bit USB PID value

12 USB power attributes

This value will be used by the MCP2221’s USB

Configuration Descriptor (power attributes value) during

the USB enumeration

13 USB requested number of mA(s)

The requested mA value during the USB enumeration

will represent the value at this index multiplied by 2

14 Current supplied-password byte 1

15 Current supplied-password byte 2

16 Current supplied-password byte 3

DS20005292B-page 54

 2015 Microchip Technology Inc.

MCP2221

TABLE 3-39: RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Function Description

Value

Effect

Index

17 Current supplied-password byte 4

18 Current supplied-password byte 5

19 Current supplied-password byte 6

20 Current supplied-password byte 7

21 Current supplied-password byte 8

22 GP0 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When the GP0 is set as an output GPIO, this value will

be present at the GP0 pin

Bit 3: GPIO Direction (Input/Output) –

Works only when GP0 is set for GPIO

operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP0 Designation

111-011 Don’t care

010

001

000

Alternate function 0 (LED UART RX)

Dedicated function operation (SSPND)

GPIO operation

23 GP1 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When the GP1 is set as an output GPIO, this value will

be present at the GP1 pin

Bit 3: GPIO Direction (Input/Output) –

Works only when GP1 is set for GPIO

operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP1 Designation

111-101 Don’t care

100

011

010

001

000

Alternate function 2 (Interrupt Detection)

Alternate function 1 (LED UART TX)

Alternate function 0 (ADC1)

Dedicated function operation (Clock Output)

GPIO operation

24 GP2 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When the GP2 is set as an output GPIO, this value will

be present at the GP2 pin

Bit 3: GPIO Direction (Input/Output) –

Works only when GP2 is set for GPIO

operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP2 Designation

111-100 Don’t care

011

010

001

000

Alternate function 1 (DAC1)

Alternate function 0 (ADC2)

Dedicated function operation (USBCFG)

GPIO operation

 2015 Microchip Technology Inc.

DS20005292B-page 55

MCP2221

TABLE 3-39: RESPONSE 1 STRUCTURE (CONTINUED)

Byte

Function Description

Value

Effect

Index

25 GP3 settings

Bit 7-5

Don’t

care

Bit 4: GPIO Output value

When the GP3 is set as an output GPIO, this value will

be present at the GP3 pin

Bit 3: GPIO Direction (Input/Output) –

Works only when GP3 is set for GPIO

operation

1

0

GPIO Input mode

GPIO Output mode

Bit 2-0: GP3 Designation

111-100 Don’t care

011

010

001

000

Alternate function 1 (DAC2)

Alternate function 0 (ADC3)

Dedicated function operation (LED I2C)

GPIO operation

26-63

Don’t

care

DS20005292B-page 56

 2015 Microchip Technology Inc.

MCP2221

3.1.15

RESET CHIP

This command is used to force a Reset of the

MCP2221 device. This command is useful when the

Flash memory is updated with new data. The

MCP2221 would need to be re-enumerated to see the

new data.

Note:

This command is the only command that

does not expect a response.

TABLE 3-40: COMMAND STRUCTURE

Byte

Value

Index

Effect

0

1

0x70

0xAB

0xCD

0xEF

0x00

Reset Chip – command code

2

3

4-63

Reserved

 2015 Microchip Technology Inc.

DS20005292B-page 57

MCP2221

NOTES:

DS20005292B-page 58

 2015 Microchip Technology Inc.

MCP2221

4.0

ELECTRICAL

CHARACTERISTICS

(†)(1)

Absolute Maximum Ratings

Ambient temperature under bias...............................................................................................................-40°C to +85°C

Storage temperature .............................................................................................................................. -65°C to +150°C

Voltage on VDD with respect to VSS ......................................................................................................... -0.3V to +6.0V

Voltage on RST with respect to VSS ......................................................................................................... -0.3V to +9.0V

Voltage on VUSB pin with respect to VSS .................................................................................................. -0.3V to +4.0V

Voltage on D+ and D- pins with respect to VSS ............................................................................ -0.3V to (VUSB + 0.3V)

Voltage on all other pins with respect to VSS ................................................................................. -0.3V to (VDD + 0.3V)

Total power dissipation⁽²⁾.....................................................................................................................................800 mW

Maximum current out of VSS pin ............................................................................................................................ 95 mA

Maximum current into VDD pin............................................................................................................................... 95 mA

Clamp current, IK (VPIN < 0 or VPIN > VDD)20 mA

Maximum output current sunk by any I/O pin .........................................................................................................25 mA

Maximum output current sourced by any I/O pin ....................................................................................................25 mA

Maximum current sunk by all ports .........................................................................................................................90 mA

Maximum current sourced by all ports................................................................................................................... 90 mA

† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional operation of the device at those or any other conditions above those

indicated in the operation listings of this specification is not implied. Exposure above maximum rating conditions for

extended periods may affect device reliability.

Note 1: VUSB must always be  VDD + 0.3V.

2: Power dissipation is calculated as follows: PDIS = VDD x {IDD –  IOH} +  {(VDD –

VOH) x IOH} + (VOL x IOL).

 2015 Microchip Technology Inc.

DS20005292B-page 59

MCP2221

4.1

DC CHARACTERISTICS

Operating Conditions (unless otherwise indicated):

3.0V  VDD  5.5V at -40C  TA  +85C (I-Temp)

DC Characteristics

Param.

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

No.

D001 Supply Voltage

VDD

3.0

—

5.5

V

POR

VPOR

1.6

Release Voltage

POR

Rearm Voltage

0.8

—

V

D003 VDD Rise Rate to Ensure

POR

SVDD

IDD

0.05

—

V/ms Design guidance only

Not tested

D004 Supply Current

VDD = 3.0V

—

10

13

46

12

15

—

mA FOSC = 12 MHz,

(330 nF on VUSB)

VDD = 5.0V

mA

D005 Standby Current

Input Low-Voltage

D031 Schmitt Trigger (URX)

TTL (GP pins)

IDDS

VIL

µA

—

0.2 VDD

0.8

V

3.0V  VDD  5.5V

4.5V  VDD  5.5V

Input High-Voltage

D041 Schmitt Trigger (URX)

TTL (GP pins)

VIH

0.8 VDD

2.0

—

VDD

3.0V  VDD  5.5V

4.5V  VDD  5.5V

Input Leakage Current

D060 GP, URX

IIL

—

±50

±100

nA

V

VSS  VPIN  VDD,

pin at Hi-Z

Output Low-Voltage

D080 GP, UTX

VOL

—

0.6

IOL = 8.0 mA, VDD = 5.0V

IOL = 6.0 mA, VDD = 3.3V

Output High-Voltage

D090 GP, UTX

VOH

VDD – 0.7

—

V

IOH = -3.5 mA, VDD = 5.0V

IOH = -3.0 mA, VDD = 3.3V

Capacitive Loading Specs on Output Pins

D102 GPIO

CIO

—

50

pF

Note 1

Note 1: Characterized only, not 100% tested.

DS20005292B-page 60

 2015 Microchip Technology Inc.

MCP2221

FIGURE 4-1:

POR AND POR REARM WITH SLOW RISING VDD

VDD

VPOR

VPORR

VSS

NPOR⁽¹⁾

POR REARM

VSS

(3)

TPOR

(2)

TVLOW

Note 1: When NPOR is low, the device is held in Reset.

2: TPOR 1 µs typical.

3: TVLOW 2.7 µs typical.

TABLE 4-1:

USB MODULE SPECIFICATIONS

Operating Conditions (unless otherwise indicated):

3.0V  VDD  5.5V at -40°C  TA  +85°C (I-Temp)

DC Characteristics

Param.

No.

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

D313 USB Voltage

VUSB

3.0

—

3.6

V

Voltage on the VUSB pin must

be in this range for proper

USB operation

D314 Input Leakage on Pin

IIL

—

±1

0.8

—

μA

V

VSS  VPIN  VDD pin at

high impedance

D315 Input Low Voltage

for USB Buffer

VILUSB

VIHUSB

VDIFS

For VUSB range

D316 Input High Voltage

for USB Buffer

2.0

—

V

D318 Differential Input

Sensitivity

0.2

V

The difference between D+

and D- must exceed this value

while VCM is met

D319 Differential Common

Mode Range

VCM

0.8

28

—

2.5

44

V

D320 Driver Output

Impedance⁽¹⁾

ZOUT

W

D321 Voltage Output Low

D322 Voltage Output High

VOL

VOH

0.0

2.8

—

0.3

3.6

V

1.5 k load connected to 3.6V

1.5 k load connected to

ground

Note 1: The D+ and D- signal lines have been built-in impedance matching resistors. No external resistors,

capacitors or magnetic components are necessary on the D+/D- signal paths between the MCP2221

family device and the USB cable.

 2015 Microchip Technology Inc.

DS20005292B-page 61

MCP2221

TABLE 4-2:

THERMAL CONSIDERATIONS

Standard Operating Conditions (unless otherwise stated)

Operating temperature: -40C  TA  +85C (I-Temp)

Param.

No.

Sym.

Characteristic

Typ.

Units

Conditions

TH01

θJA

Thermal Resistance Junction

to Ambient

70

95.3

100

45.7

32

C/W 14-pin PDIP package

C/W 14-pin SOIC package

C/W 14-pin TSSOP package

C/W 16-pin QFN 4 x 4 mm package

C/W 14-pin PDIP package

C/W 14-pin SOIC package

C/W 14-pin TSSOP package

C/W 16-pin QFN 4 x 4 mm package

C

TH02

θJC

Thermal Resistance Junction

to Case

31

24.4

6.3

+150

—

TH03

TH04

TJMAX

PD

Maximum Junction Temperature

Power Dissipation

W

PD = PINTERNAL + PI/O

PINTERNAL = IDD x VDD

(1)

TH05 PINTERNAL Internal Power Dissipation

—

TH06

TH07

PI/O

I/O Power Dissipation

Derated Power

—

PI/O = (IOL x VOL) + (IOH x (VDD – VOH))

PDER = PDMAX (TJ – TA)/θJA

(2, 3)

PDER

—

Note 1: IDD is the current to run the device alone without driving any load on the output pins.

2: TA = Ambient Temperature.

3: TJ = Junction Temperature.

DS20005292B-page 62

 2015 Microchip Technology Inc.

MCP2221

4.2

AC Characteristics

4.2.1

TIMING PARAMETER SYMBOLOGY

The timing parameter symbols have been created in

one of the following formats:

1. TppS2ppS

T

2. TppS

T

F

E

Frequency

Error

Time

Lowercase letters (pp) and their meanings:

pp

io

Input or Output pin

Receive

osc

tx

Oscillator

Transmit

Reset

rx

bitclk

drt

RX/TX BITCLK

Device Reset Timer

RST

Uppercase letters and their meanings:

S

F

H

I

Fall

P

R

V

Z

Period

High

Rise

Invalid (high-impedance)

Low

Valid

L

High-impedance

4.2.2

TIMING CONDITIONS

The operating temperature and voltage specified in

Table 4-3 apply to all timing specifications, unless

otherwise noted. Figure 4-2 specifies the load

conditions for the timing specifications.

TABLE 4-3:

TEMPERATURE AND VOLTAGE SPECIFICATIONS – AC

Standard Operating Conditions (unless otherwise stated)

Operating temperature -40C  TA  +85C

Operating voltage VDD range as described in DC spec,

AC CHARACTERISTICS

Section 4.1 “DC Characteristics”.

FIGURE 4-2:

LOAD CONDITIONS

FOR DEVICE TIMING

SPECIFICATIONS

50 pF

 2015 Microchip Technology Inc.

DS20005292B-page 63

MCP2221

4.2.3

TIMING DIAGRAMS AND

SPECIFICATIONS

TABLE 4-4: RESET, OSCILLATOR START-UP TIMER AND POWER-UP TIMER PARAMETERS

Standard Operating Conditions (unless otherwise stated)

Operating Temperature: -40°C  TA  +85°C

Param

No.

Sym.

Characteristic

Min. Typ.^†Max.

Units

Conditions

30

31

32

TRST

RST Pulse Width (low)

2

—

65

—

140

—

μs

ms

TPWRT Power-Up timer

TOST Oscillator Start-Up Time

40

—

1024

TOST

* These parameters are characterized but not tested.

† Data in the “Typ.” column is at 5V, +25°C, unless otherwise stated. These parameters are for design

guidance only and are not tested.

DS20005292B-page 64

 2015 Microchip Technology Inc.

MCP2221

5.0

5.1

PACKAGING INFORMATION

Package Marking Information

14-Lead PDIP (300 mil)

Example

MCP2221

I/P ^

e3

^

1448256

14-Lead SOIC (3.90 mm)

Example

MCP2221

I/SL

1448256

14-Lead TSSOP (4.4 mm)

Example

XXXXXXXX

YYWW

2221ST

1448

256

NNN

16-Lead QFN (4x4x0.9 mm)

Example

2221

I/ML ^

448256

PIN 1

e

^

3

Legend: XX...X Customer-specific information

Y

Year code (last digit of calendar year)

YY

Year code (last 2 digits of calendar year)

Week code (week of January 1 is week ‘01’)

Alphanumeric traceability code

WW

NNN

e

3

Pb-free JEDEC designator for Matte Tin (Sn)

*

This package is Pb-free. The Pb-free JEDEC designator (

can be found on the outer packaging for this package.

)

e3

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information.

 2015 Microchip Technology Inc.

DS20005292B-page 65

MCP2221

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N

NOTE 1

E1

3

1

2

D

E

A2

A

L

c

A1

b1

b

e

eB

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ꢱꢴꢢ

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ꢱꢈꢑꢔꢌꢐꢅꢕꢎꢅꢂꢃꢄꢇꢱ

ꢂꢃꢏꢖꢘ

ꢫꢕꢡꢅꢏꢕꢅꢛꢌꢉꢏꢃꢄꢜꢅꢂꢊꢉꢄꢌ

ꢀꢥ

ꢌ

ꢁꢀꢣꢣꢅꢩꢛꢝ

ꢶ

ꢦ

ꢶ

ꢁꢙꢀꢣ

ꢁꢀꢷꢨ

ꢶ

ꢢꢕꢊꢋꢌꢋꢅꢂꢉꢖꢭꢉꢜꢌꢅꢫꢘꢃꢖꢭꢄꢌꢇꢇ

ꢩꢉꢇꢌꢅꢏꢕꢅꢛꢌꢉꢏꢃꢄꢜꢅꢂꢊꢉꢄꢌ

ꢛꢘꢕꢈꢊꢋꢌꢐꢅꢏꢕꢅꢛꢘꢕꢈꢊꢋꢌꢐꢅꢸꢃꢋꢏꢘ

ꢢꢕꢊꢋꢌꢋꢅꢂꢉꢖꢭꢉꢜꢌꢅꢸꢃꢋꢏꢘ

ꢴꢆꢌꢐꢉꢊꢊꢅꢳꢌꢄꢜꢏꢘ

ꢫꢃꢡꢅꢏꢕꢅꢛꢌꢉꢏꢃꢄꢜꢅꢂꢊꢉꢄꢌ

ꢳꢌꢉꢋꢅꢫꢘꢃꢖꢭꢄꢌꢇꢇ

ꢯꢡꢡꢌꢐꢅꢳꢌꢉꢋꢅꢸꢃꢋꢏꢘ

ꢦꢙ

ꢦꢀ

ꢠ

ꢠꢀ

ꢟ

ꢳ

ꢖ

ꢔꢀ

ꢔ

ꢌꢩ

ꢁꢀꢀꢨ

ꢁꢣꢀꢨ

ꢁꢙꢷꢣ

ꢁꢙꢥꢣ

ꢁꢺꢞꢨ

ꢁꢀꢀꢨ

ꢁꢣꢣꢹ

ꢁꢣꢥꢨ

ꢁꢣꢀꢥ

ꢶ

ꢁꢀꢞꢣ

ꢶ

ꢁꢞꢀꢣ

ꢁꢙꢨꢣ

ꢁꢺꢨꢣ

ꢁꢀꢞꢣ

ꢁꢣꢀꢣ

ꢁꢣꢻꢣ

ꢁꢣꢀꢹ

ꢶ

ꢁꢞꢙꢨ

ꢁꢙꢹꢣ

ꢁꢺꢺꢨ

ꢁꢀꢨꢣ

ꢁꢣꢀꢨ

ꢁꢣꢺꢣ

ꢁꢣꢙꢙ

ꢁꢥꢞꢣ

ꢳꢕꢗꢌꢐꢅꢳꢌꢉꢋꢅꢸꢃꢋꢏꢘ

ꢴꢆꢌꢐꢉꢊꢊꢅꢼꢕꢗꢅꢛꢡꢉꢖꢃꢄꢜꢅꢅꢚ

ꢝꢙꢋꢄꢊꢞ

ꢀꢁ ꢂꢃꢄꢅꢀꢅꢆꢃꢇꢈꢉꢊꢅꢃꢄꢋꢌꢍꢅꢎꢌꢉꢏꢈꢐꢌꢅꢑꢉꢒꢅꢆꢉꢐꢒꢓꢅꢔꢈꢏꢅꢑꢈꢇꢏꢅꢔꢌꢅꢊꢕꢖꢉꢏꢌꢋꢅꢗꢃꢏꢘꢅꢏꢘꢌꢅꢘꢉꢏꢖꢘꢌꢋꢅꢉꢐꢌꢉꢁ

ꢙꢁ ꢚꢅꢛꢃꢜꢄꢃꢎꢃꢖꢉꢄꢏꢅꢝꢘꢉꢐꢉꢖꢏꢌꢐꢃꢇꢏꢃꢖꢁ

ꢞꢁ ꢟꢃꢑꢌꢄꢇꢃꢕꢄꢇꢅꢟꢅꢉꢄꢋꢅꢠꢀꢅꢋꢕꢅꢄꢕꢏꢅꢃꢄꢖꢊꢈꢋꢌꢅꢑꢕꢊꢋꢅꢎꢊꢉꢇꢘꢅꢕꢐꢅꢡꢐꢕꢏꢐꢈꢇꢃꢕꢄꢇꢁꢅꢢꢕꢊꢋꢅꢎꢊꢉꢇꢘꢅꢕꢐꢅꢡꢐꢕꢏꢐꢈꢇꢃꢕꢄꢇꢅꢇꢘꢉꢊꢊꢅꢄꢕꢏꢅꢌꢍꢖꢌꢌꢋꢅꢁꢣꢀꢣꢤꢅꢡꢌꢐꢅꢇꢃꢋꢌꢁ

ꢥꢁ ꢟꢃꢑꢌꢄꢇꢃꢕꢄꢃꢄꢜꢅꢉꢄꢋꢅꢏꢕꢊꢌꢐꢉꢄꢖꢃꢄꢜꢅꢡꢌꢐꢅꢦꢛꢢꢠꢅꢧꢀꢥꢁꢨꢢꢁ

ꢩꢛꢝꢪꢅꢩꢉꢇꢃꢖꢅꢟꢃꢑꢌꢄꢇꢃꢕꢄꢁꢅꢫꢘꢌꢕꢐꢌꢏꢃꢖꢉꢊꢊꢒꢅꢌꢍꢉꢖꢏꢅꢆꢉꢊꢈꢌꢅꢇꢘꢕꢗꢄꢅꢗꢃꢏꢘꢕꢈꢏꢅꢏꢕꢊꢌꢐꢉꢄꢖꢌꢇꢁ

ꢢꢃꢖꢐꢕꢖꢘꢃꢡ ꢫꢌꢖꢘꢄꢕꢊꢕꢜꢒ ꢟꢐꢉꢗꢃꢄꢜ ꢝꢣꢥꢽꢣꢣꢨꢩ

DS20005292B-page 66

 2015 Microchip Technology Inc.

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2015 Microchip Technology Inc.

DS20005292B-page 67

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

DS20005292B-page 68

 2015 Microchip Technology Inc.

MCP2221

ꢝꢙꢋꢄꢞ ꢬꢕꢐꢅꢏꢘꢌꢅꢑꢕꢇꢏꢅꢖꢈꢐꢐꢌꢄꢏꢅꢡꢉꢖꢭꢉꢜꢌꢅꢋꢐꢉꢗꢃꢄꢜꢇꢓꢅꢡꢊꢌꢉꢇꢌꢅꢇꢌꢌꢅꢏꢘꢌꢅꢢꢃꢖꢐꢕꢖꢘꢃꢡꢅꢂꢉꢖꢭꢉꢜꢃꢄꢜꢅꢛꢡꢌꢖꢃꢎꢃꢖꢉꢏꢃꢕꢄꢅꢊꢕꢖꢉꢏꢌꢋꢅꢉꢏꢅ

ꢘꢏꢏꢡꢪꢮꢮꢗꢗꢗꢁꢑꢃꢖꢐꢕꢖꢘꢃꢡꢁꢖꢕꢑꢮꢡꢉꢖꢭꢉꢜꢃꢄꢜ

 2015 Microchip Technology Inc.

DS20005292B-page 69

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

DS20005292B-page 70

 2015 Microchip Technology Inc.

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

 2015 Microchip Technology Inc.

DS20005292B-page 71

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

DS20005292B-page 72

 2015 Microchip Technology Inc.

MCP2221

ꢀꢟꢂꢃꢄꢅꢆꢇꢈꢉꢅꢊꢋꢌꢍꢇꢠꢏꢅꢆꢇꢡꢉꢅꢋꢢꢇꢝꢙꢇꢃꢄꢅꢆꢇꢈꢅꢍꢣꢅꢤꢄꢇꢒꢥꢃꢓꢇꢔꢇꢁꢦꢁꢦꢖꢧꢨꢇꢗꢗꢇꢘꢙꢆꢚꢇꢛꢠꢡꢝꢜ

ꢝꢙꢋꢄꢞ ꢬꢕꢐꢅꢏꢘꢌꢅꢑꢕꢇꢏꢅꢖꢈꢐꢐꢌꢄꢏꢅꢡꢉꢖꢭꢉꢜꢌꢅꢋꢐꢉꢗꢃꢄꢜꢇꢓꢅꢡꢊꢌꢉꢇꢌꢅꢇꢌꢌꢅꢏꢘꢌꢅꢢꢃꢖꢐꢕꢖꢘꢃꢡꢅꢂꢉꢖꢭꢉꢜꢃꢄꢜꢅꢛꢡꢌꢖꢃꢎꢃꢖꢉꢏꢃꢕꢄꢅꢊꢕꢖꢉꢏꢌꢋꢅꢉꢏꢅ

ꢘꢏꢏꢡꢪꢮꢮꢗꢗꢗꢁꢑꢃꢖꢐꢕꢖꢘꢃꢡꢁꢖꢕꢑꢮꢡꢉꢖꢭꢉꢜꢃꢄꢜ

D

D2

EXPOSED

PAD

e

E

E2

2

1

2

b

1

K

N

NOTE 1

L

TOP VIEW

BOTTOM VIEW

A3

A

A1

ꢯꢄꢃꢏꢇꢢꢰꢳꢳꢰꢢꢠꢫꢠꢼꢛ

ꢟꢃꢑꢌꢄꢇꢃꢕꢄꢅꢳꢃꢑꢃꢏꢇ

ꢢꢰꢱ

ꢱꢴꢢ

ꢢꢦꢵ

ꢱꢈꢑꢔꢌꢐꢅꢕꢎꢅꢂꢃꢄꢇꢱ

ꢂꢃꢏꢖꢘ

ꢴꢆꢌꢐꢉꢊꢊꢅꢲꢌꢃꢜꢘꢏ

ꢛꢏꢉꢄꢋꢕꢎꢎꢅ

ꢝꢕꢄꢏꢉꢖꢏꢅꢫꢘꢃꢖꢭꢄꢌꢇꢇ

ꢴꢆꢌꢐꢉꢊꢊꢅꢸꢃꢋꢏꢘ

ꢠꢍꢡꢕꢇꢌꢋꢅꢂꢉꢋꢅꢸꢃꢋꢏꢘ

ꢴꢆꢌꢐꢉꢊꢊꢅꢳꢌꢄꢜꢏꢘ

ꢠꢍꢡꢕꢇꢌꢋꢅꢂꢉꢋꢅꢳꢌꢄꢜꢏꢘ

ꢝꢕꢄꢏꢉꢖꢏꢅꢸꢃꢋꢏꢘ

ꢝꢕꢄꢏꢉꢖꢏꢅꢳꢌꢄꢜꢏꢘ

ꢀꢻ

ꢌ

ꢣꢁꢻꢨꢅꢩꢛꢝ

ꢣꢁꢷꢣ

ꢣꢁꢣꢙ

ꢣꢁꢙꢣꢅꢼꢠꢬ

ꢥꢁꢣꢣꢅꢩꢛꢝ

ꢙꢁꢻꢨ

ꢥꢁꢣꢣꢅꢩꢛꢝ

ꢙꢁꢻꢨ

ꢦ

ꢣꢁꢹꢣ

ꢣꢁꢣꢣ

ꢀꢁꢣꢣ

ꢣꢁꢣꢨ

ꢦꢀ

ꢦꢞ

ꢠ

ꢠꢙ

ꢟ

ꢟꢙ

ꢔ

ꢳ

ꢙꢁꢨꢣ

ꢙꢁꢹꢣ

ꢙꢁꢨꢣ

ꢣꢁꢙꢨ

ꢣꢁꢞꢣ

ꢣꢁꢙꢣ

ꢙꢁꢹꢣ

ꢣꢁꢞꢨ

ꢣꢁꢨꢣ

ꢶ

ꢣꢁꢞꢣ

ꢣꢁꢥꢣ

ꢶ

ꢝꢕꢄꢏꢉꢖꢏꢽꢏꢕꢽꢠꢍꢡꢕꢇꢌꢋꢅꢂꢉꢋ

V

ꢝꢙꢋꢄꢊꢞ

ꢀꢁ ꢂꢃꢄꢅꢀꢅꢆꢃꢇꢈꢉꢊꢅꢃꢄꢋꢌꢍꢅꢎꢌꢉꢏꢈꢐꢌꢅꢑꢉꢒꢅꢆꢉꢐꢒꢓꢅꢔꢈꢏꢅꢑꢈꢇꢏꢅꢔꢌꢅꢊꢕꢖꢉꢏꢌꢋꢅꢗꢃꢏꢘꢃꢄꢅꢏꢘꢌꢅꢘꢉꢏꢖꢘꢌꢋꢅꢉꢐꢌꢉꢁ

ꢙꢁ ꢂꢉꢖꢭꢉꢜꢌꢅꢃꢇꢅꢇꢉꢗꢅꢇꢃꢄꢜꢈꢊꢉꢏꢌꢋꢁ

ꢞꢁ ꢟꢃꢑꢌꢄꢇꢃꢕꢄꢃꢄꢜꢅꢉꢄꢋꢅꢏꢕꢊꢌꢐꢉꢄꢖꢃꢄꢜꢅꢡꢌꢐꢅꢦꢛꢢꢠꢅꢧꢀꢥꢁꢨꢢꢁ

ꢩꢛꢝꢪ ꢩꢉꢇꢃꢖꢅꢟꢃꢑꢌꢄꢇꢃꢕꢄꢁꢅꢫꢘꢌꢕꢐꢌꢏꢃꢖꢉꢊꢊꢒꢅꢌꢍꢉꢖꢏꢅꢆꢉꢊꢈꢌꢅꢇꢘꢕꢗꢄꢅꢗꢃꢏꢘꢕꢈꢏꢅꢏꢕꢊꢌꢐꢉꢄꢖꢌꢇꢁ

ꢼꢠꢬꢪ ꢼꢌꢎꢌꢐꢌꢄꢖꢌꢅꢟꢃꢑꢌꢄꢇꢃꢕꢄꢓꢅꢈꢇꢈꢉꢊꢊꢒꢅꢗꢃꢏꢘꢕꢈꢏꢅꢏꢕꢊꢌꢐꢉꢄꢖꢌꢓꢅꢎꢕꢐꢅꢃꢄꢎꢕꢐꢑꢉꢏꢃꢕꢄꢅꢡꢈꢐꢡꢕꢇꢌꢇꢅꢕꢄꢊꢒꢁ

ꢢꢃꢖꢐꢕꢖꢘꢃꢡ ꢫꢌꢖꢘꢄꢕꢊꢕꢜꢒ ꢟꢐꢉꢗꢃꢄꢜ ꢝꢣꢥꢽꢀꢙꢺꢩ

 2015 Microchip Technology Inc.

DS20005292B-page 73

MCP2221

Note: For the most current package drawings, please see the Microchip Packaging Specification located at

http://www.microchip.com/packaging

DS20005292B-page 74

 2015 Microchip Technology Inc.

MCP2221

APPENDIX A: REVISION HISTORY

Revision B (February 2015)

1. Updated bit settings in Registers 1-1 to 1-7,

Register 1-10 and Registers 1-12, 1-13,

1-14, 1-15.

Revision A (May 2014)

Original Release of this Document.

 2015 Microchip Technology Inc.

DS20005292B-page 75

MCP2221

NOTES:

DS20005292B-page 76

 2015 Microchip Technology Inc.

MCP2221

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, contact your local Microchip sales office.

(1)

[X]

PART NO.

Device

X

/XX

Examples:

a)

MCP2221- I/P:

Industrial temperature,

14LD PDIP Package

Tape and Reel

Option

Temperature Package

Range

a)

b)

MCP2221- I/SL:

Industrial temperature,

14LD SOIC Package

Device:

MCP2221:

MCP2221T:

USB-to-I²C/UART Protocol Converter

(Tape and Reel)

MCP2221T- I/SL: Tape and Reel,

Industrial temperature,

14LD SOIC Package

a)

b)

MCP2221- I/ST:

Industrial temperature,

14LD TSSOP Package

Temperature Range:

Package:

I

=

-40C to +85C (Industrial)

MCP2221T- I/ST: Tape and Reel,

Industrial temperature,

ML

Plastic Quad Flat, No Lead Package – 4x4x0.9 mm

Body (QFN), 16-Lead

14LD TSSOP Package

P

SL

=

Plastic Dual In Line, 300 mil. Body (PDIP), 14-Lead

Plastic Small Outline – Narrow, 3.90 mm Body

(SOIC), 14-Lead

Plastic Thin Shrink Small Outline – 4.4 mm Body

(TSSOP), 14-Lead

a)

b)

MCP2221- I/ML:

Industrial temperature,

16LD 4x4 QFN Package

MCP2221T- I/ML: Tape and Reel,

Industrial temperature,

ST

=

16LD 4x4 QFN Package

Note 1:

Tape and Reel identifier only appears in the catalog part number description.

This identifier is used for ordering purposes and is not printed on the device

package. Check with your Microchip Sales Office for package availability with

the Tape and Reel option.

 2015 Microchip Technology Inc.

DS20005292B-page 77

MCP2221

NOTES:

DS20005292B-page 78

 2015 Microchip Technology Inc.

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defend, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, dsPIC,

FlashFlex, flexPWR, JukeBlox, KEELOQ, KEELOQ logo, Kleer,

LANCheck, MediaLB, MOST, MOST logo, MPLAB,

32

OptoLyzer, PIC, PICSTART, PIC logo, RightTouch, SpyNIC,

SST, SST Logo, SuperFlash and UNI/O are registered

trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

The Embedded Control Solutions Company and mTouch are

registered trademarks of Microchip Technology Incorporated

in the U.S.A.

Analog-for-the-Digital Age, BodyCom, chipKIT, chipKIT logo,

CodeGuard, dsPICDEM, dsPICDEM.net, ECAN, In-Circuit

Serial Programming, ICSP, Inter-Chip Connectivity, KleerNet,

KleerNet logo, MiWi, MPASM, MPF, MPLAB Certified logo,

MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code

Generation, PICDEM, PICDEM.net, PICkit, PICtail,

RightTouch logo, REAL ICE, SQI, Serial Quad I/O, Total

Endurance, TSHARC, USBCheck, VariSense, ViewSpan,

WiperLock, Wireless DNA, and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other

countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

Silicon Storage Technology is a registered trademark of

Microchip Technology Inc. in other countries.

GestIC is a registered trademarks of Microchip Technology

Germany II GmbH & Co. KG, a subsidiary of Microchip

Technology Inc., in other countries.

All other trademarks mentioned herein are property of their

respective companies.

ISBN: 978-1-63277-016-5

QUALITY MANAGEMENT SYSTEM

CERTIFIED BY DNV

Microchip received ISO/TS-16949:2009 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC^®MCUs and dsPIC^®DSCs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

== ISO/TS 16949 ==

 2015 Microchip Technology Inc.

DS20005292B-page 79

Worldwide Sales and Service

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://www.microchip.com/

support

Asia Pacific Office

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

Hong Kong

Tel: 852-2943-5100

Fax: 852-2401-3431

India - Bangalore

Tel: 91-80-3090-4444

Fax: 91-80-3090-4123

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

Web Address:

www.microchip.com

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

Germany - Dusseldorf

Tel: 49-2129-3766400

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

China - Beijing

Tel: 86-10-8569-7000

Fax: 86-10-8528-2104

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

India - Pune

Tel: 91-20-3019-1500

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

Austin, TX

Tel: 512-257-3370

Japan - Osaka

Tel: 81-6-6152-7160

Fax: 81-6-6152-9310

Germany - Pforzheim

Tel: 49-7231-424750

Boston

China - Chongqing

Tel: 86-23-8980-9588

Fax: 86-23-8980-9500

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Japan - Tokyo

Tel: 81-3-6880- 3770

Fax: 81-3-6880-3771

China - Dongguan

Tel: 86-769-8702-9880

Italy - Venice

Tel: 39-049-7625286

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

China - Hangzhou

Tel: 86-571-8792-8115

Fax: 86-571-8792-8116

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Korea - Seoul

Cleveland

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

China - Hong Kong SAR

Tel: 852-2943-5100

Fax: 852-2401-3431

Poland - Warsaw

Tel: 48-22-3325737

Independence, OH

Tel: 216-447-0464

Fax: 216-447-0643

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

Sweden - Stockholm

Tel: 46-8-5090-4654

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Detroit

Novi, MI

UK - Wokingham

Tel: 44-118-921-5800

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Tel: 248-848-4000

Fax: 44-118-921-5820

Houston, TX

Tel: 281-894-5983

Indianapolis

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

Noblesville, IN

Tel: 317-773-8323

China - Shenzhen

Tel: 86-755-8864-2200

Fax: 86-755-8203-1760

Taiwan - Hsin Chu

Tel: 886-3-5778-366

Fax: 886-3-5770-955

Fax: 317-773-5453

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Kaohsiung

Tel: 886-7-213-7828

Taiwan - Taipei

Tel: 886-2-2508-8600

Fax: 886-2-2508-0102

New York, NY

Tel: 631-435-6000

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

San Jose, CA

Tel: 408-735-9110

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

Canada - Toronto

Tel: 905-673-0699

Fax: 905-673-6509

01/27/15

DS20005292B-page 80

 2015 Microchip Technology Inc.


型号：	MCP2221T-I/SL
厂家：	MICROCHIP
描述：	USB 2.0 to I2Câ¢/UART Protocol Converter with GPIO
文件：	总80页 (文件大小：1321K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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