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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2221 Datasheet

UART Protocol Converter

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MCP2221 pdf
MCP2221
USB 2.0 to I2C/UART Protocol Converter with GPIO
Features:
Universal Serial Bus (USB)
• Supports Full-Speed USB (12 Mb/s)
• Implements USB Protocol Composite Device:
- Communication Device Class (CDC) for
USB-to-UART Conversion
- Human Interface Device (HID) for I2C™
Device Control and Configuration
• 128-byte Buffer to Handle Data Throughput at
Any Supported UART Baud Rate:
- 64-Byte Transmit
- 64-Byte Receive
• Human Interface Device (HID) for Both
I2C Communication and Control:
64-byte Buffer to Handle Data Throughput at
Any I2C Baud Rate
• Fully-Configurable VID and PID Assignments and
String Descriptors
• Bus-powered or Self-powered
• USB 2.0-Compliant: TID# 40001594
USB Driver and Software Support
• 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
• Configuration Utility for Establishing a Custom
Boot-up Configuration
• I2C/SMBus Terminal
• Windows DLL
CDC and Universal Asynchronous
Receiver/Transmitter (UART) Options
• Communications Device Class (CDC) for the
USB-to-UART Option
• Responds to SET LINE CODING Commands to
Dynamically Change Baud Rates
• Supports Baud Rates: 300-115200
• UART TX and RX Pins Only
• 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
I2C/SMBus
• The Device Runs as an I2C Master. The Data to
Write/Read On the I2C Bus is Conveyed By the
USB Interface.
• I2C Master
- Up to 400 kHz Clock Rate
- Supports 7- or 10-bit Addressable Devices;
10-bit Addressable Devices are Supported
Through the PC Host Library
- Supports Block Reads/Writes of Up to 65,535
Bytes Long
• SMBus Master
- Supports All of the SMBus Transfers
- SMBus Functionality is Achieved Through a
Combination of Chip and Support Library
Processing
- Up to 400 kHz Clock Rate
General-Purpose Input/Output (GPIO) Pins
• Four General-Purpose Input/Output Pins
• All GP Pins Can Be Assigned to Other
Functionalities
Other Functionalities
• UART Activity LED Outputs (UTX and URX)
• SSPND Output Pin
• USBCFG Output Pin (Indicates When the
Enumeration Has Completed)
• Three ADC Inputs
• One DAC with Two Possible Output Options
• Clock Reference Output: 12 MHz or Other
Configurable Values
• External Interrupt Edge Detection
Other
• Operating Voltage: 3.0 to 5.5V
• Electrostatic Discharge (ESD) Protection: > 4 kV
Human Body Model (HBM)
• Industrial (I) Operating Temperature: -40°C to +85°C
2015 Microchip Technology Inc.
DS20005292B-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2221 Datasheet

UART Protocol Converter

No Preview Available !

MCP2221 pdf
MCP2221
Package Types
MCP2221
PDIP/SOIC/TSSOP
VDD
GP0
GP1
RST
URX
UTX
GP2
1
2
3
4
5
6
7
14 VSS
13 D+
12 D-
11 VUSB
10 SCL
9 SDA
8 GP3
MCP2221
4 x 4 QFN*
16 15 14 13
GP0 1
12 D+
GP1 2
RST 3
EP 11 D-
17
10 VUSB
URX 4
9 SCL
5678
Block Diagram
* Includes Exposed Thermal Pad (EP); see Table 1-1.
USB
Bus
USB Module &
Transceiver
USB HID
USB CDC
Internal
Oscillator
CONFIG
BUS MATRIX
GPIO
ADC/DAC
I2C Master
I2C
Bus
TXD/RXD
UART
IOC
PIN
MUX
GP Pins
CLKR
DS20005292B-page 2
2015 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP2221 Datasheet

UART Protocol Converter

No Preview Available !

MCP2221 pdf
MCP2221
1.0 FUNCTIONAL DESCRIPTION
The MCP2221 is a USB-to-UART serial converter that
enables USB connectivity in applications that have
UART and/or I2C interfaces. The device reduces
external components by integrating the USB
termination resistors and the oscillator needed for USB
operation.
The MCP2221 has four GP pins for miscellaneous
functionalities (including GPIO, USBCFG, SSPND,
Clock Output, ADC, DAC and interrupt detector).
See Table 1-1 and Section 1.7 “Pin Mux Module” for
details about the pin functions.
TABLE 1-1: PINOUT DESCRIPTION
Pin
Name
PDIP,
SOIC,
SSOP
QFN
Pin
Type
Standard Function
Alternate Functions
GP0 2 1 I/O General-purpose I/O or alternate SSPND (OUT) Signals when the host has
function pin
entered Suspend mode
LED_URX (OUT) UART RX LED activity output
(factory default)
GP1 3 2 I/O General-purpose I/O or alternate CLKR (OUT) Clock Reference Output
function pin
ADC1 (IN)
ADC Channel 1
LED_UTX (OUT) UART TX Led activity output
IOC (IN)
(factory default)
External interrupt edge detector
RST 4 3 I Reset input (with internal pull-up) N/A
URX 5 4 I UART RX pin (input)
N/A
UTX 6 5 O UART TX pin (output)
N/A
GP2 7 6 I/O General-purpose I/O or alternate USBCFG (OUT) USB device configured status
function pin
ADC2 (IN)
(factory default)
DAC1 (OUT)
ADC Channel 2
DAC Output 1
GP3 8 7 I/O General-purpose I/O or alternate LED_I2C (OUT) USB-I2C traffic indicator (factory
function pin
ADC3 (IN)
default)
DAC2 (OUT) ADC Channel 3
DAC Output 2
SDA 9 8 I/O I2C Data line
N/A
SCL 10 9 I/O I2C Clock line
N/A
VUSB 11 10 USB USB Power pin (internally
connected to 3.3V)
Should be locally bypassed with
a high-quality ceramic capacitor
D- 12 11 USB USB D-
D+ 13 12 USB USB D+
VSS 14 13 P Ground
NC — 14 — Not Connected
15
VDD 1 16 P Power
EP — 17 — Exposed Thermal Pad (EP)
Do not electrically connect.
2015 Microchip Technology Inc.
DS20005292B-page 3




Part Number MCP2221
Description UART Protocol Converter
Maker Microchip
Total Page 30 Pages
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