MCP2221 I
2
C DEMONSTRATION
BOARD USER’S GUIDE
2016 Microchip Technology Inc. DS50002480A-page 11
Chapter 1. Product Overview
1.1 INTRODUCTION
This chapter provides an overview of the MCP2221 I
2
C Demonstration Board and
covers the following topics:
• MCP2221 I
2
C Demonstration Board Description
• What the MCP2221 I
2
C Demonstration Board Kit Includes
1.2 MCP2221 I
2
C DEMONSTRATION BOARD DESCRIPTION
The MCP2221 I
2
C Demonstration Board allows the user to communicate through a PC
application to I
2
C slave devices by using the MCP2221 device as a USB to I
2
C master
converter (bridge). Additionally, it can create a USB to RS-232 (UART) bridge using the
same MCP2221 board.
1.2.1 Board Features Controlled through PC Application
Here are the main features of the demonstration board when used with its dedicated
PC application:
• Users can perform measurements for resistors (above 10Ω) or capacitors (above
40 nF), using the MCP2221 device’s Analog-to-Digital Converter (ADC) and
General Purpose Input/Output (GPIO) pins
• Real-time monitoring and logging of the current, and power consumptions of a
USB device using the PAC1710 current, voltage and power sensor
• Real-time monitoring and logging of the ambient temperature using the MCP9808
temperature sensor
• Real-time monitoring and logging of the voltage level recorded by the MCP3221
device’s 12-bit ADC
• Configuration and control of up to 8 GPIOs, available from the MCP23008 I/O
expander, as well as continuously monitoring the state of the pins (when used as
digital inputs)
• PIC16F1509 configuration to issue multiple warnings through an RGB LED when
any of the featured readings are outside of user settable conditions (such as
“measured USB current is above 50 mA”)
• Storing the above mentioned configuration, as well as other random data, in a
24LC128 128-Kbit Electrically Erasable Programmable Read-Only Memory
(EEPROM)
• Output voltage level control of the MCP4726 Digital-to-Analog Converter (DAC)
• Creating a USB to RS-232 bridge, based on the MCP2221 device and a Texas
Instrument’s MAX3232 transceiver; alternately creating a USB to UART bridge to
the PIC16F1509 microcontroller
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