MCP2221 I2C Demonstration Board User's Guide 2016 Microchip Technology Inc. DS50002480A 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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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 unless otherwise stated. Trademarks The Microchip name and logo, the Microchip logo, AnyRate, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, KeeLoq logo, Kleer, LANCheck, LINK MD, MediaLB, MOST, MOST logo, MPLAB, OptoLyzer, PIC, PICSTART, PIC32 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. 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SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. 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(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) 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. QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV == ISO/TS 16949 == DS50002480A-page 2 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. (c) 2016, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 978-1-5224-0492-7 2016 Microchip Technology Inc. Object of Declaration: MCP2221 I2C Demonstration Board User's Guide 2016 Microchip Technology Inc. DS50002480A-page 3 MCP2221 I2C Demonstration Board User's Guide NOTES: DS50002480A-page 4 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Table of Contents Preface ........................................................................................................................... 7 Introduction............................................................................................................ 7 Document Layout .................................................................................................. 7 Conventions Used in this Guide ............................................................................ 8 Recommended Reading........................................................................................ 9 The Microchip Web Site ........................................................................................ 9 Customer Support ................................................................................................. 9 Document Revision History ................................................................................... 9 Chapter 1. Product Overview 1.1 Introduction ................................................................................................... 11 1.2 MCP2221 I2C Demonstration Board Description ......................................... 11 1.3 What the MCP2221 I2C Demonstration Board Kit Includes ......................... 13 Chapter 2. Installation and Operation 2.1 Minimum System Requirements .................................................................. 15 2.2 Board Setup ................................................................................................. 15 2.3 Jumpers and Connectors Description .......................................................... 16 2.4 Test Points Description ................................................................................ 18 Chapter 3. Testing Board Features 3.1 About the MPC2221 I2C Demo Board Application ....................................... 19 3.2 General Information Panel Description ........................................................ 20 3.3 Feature Tabs ................................................................................................ 21 Chapter 4. Creating Custom I2C Software Applications 4.1 USB to I2C .................................................................................................... 39 4.2 PIC16F1509 as I2C Master .......................................................................... 40 4.3 I2C Slave Addresses .................................................................................... 41 Chapter 5. Troubleshooting 5.1 Board Not Detected by PC ........................................................................... 43 5.2 USB Driver Installation Issues ...................................................................... 43 5.3 PC Application Reports "MCP2221 Not Connected" .................................... 43 5.4 PC Application Reports I2C Errors ............................................................... 44 5.5 Issues Programming the PIC(R) Microcontroller ............................................. 44 2016 Microchip Technology Inc. DS50002480A-page 5 MCP2221 I2C Demonstration Board User's Guide Appendix A. Schematics and Layouts A.1 Introduction .................................................................................................. 45 A.2 Board - Interface Schematic ........................................................................ 46 A.3 Board - Slaves Schematic ........................................................................... 47 A.4 Board - Top Silk .......................................................................................... 48 A.5 Board - Top Copper and Silk ....................................................................... 48 A.6 Board - Top Copper .................................................................................... 49 A.7 Board - Bottom Copper ............................................................................... 49 A.8 Board - Bottom Copper and Silk ................................................................. 50 A.9 Board - Bottom Silk ..................................................................................... 50 Appendix B. Bill of Materials (BOM) ...........................................................................51 Worldwide Sales and Service .....................................................................................54 DS50002480A-page 6 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available. Documents are identified with a "DS" number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is "DSXXXXXXXXA", where "XXXXXXXX" is the document number and "A" is the revision level of the document. For the most up-to-date information on development tools, see the MPLAB(R) IDE online help. Select the Help menu, and then Topics to open a list of available online help files. INTRODUCTION This chapter contains general information that will be useful to know before using the MCP2221 I2C Demonstration Board. Items discussed in this chapter include: * * * * * * Document Layout Conventions Used in this Guide Recommended Reading The Microchip Web Site Customer Support Document Revision History DOCUMENT LAYOUT This document describes how to use the MCP2221 I2C Demonstration Board as an evaluation tool to debug a target motor system. The manual layout is as follows: * Chapter 1. "Product Overview" - Important information on the board. * Chapter 2. "Installation and Operation" - Covers the initial setup of this board and the Graphical User Interface (GUI). * Chapter 3. "Testing Board Features" - Describes how to use the board's capabilities. * Chapter 4. "Creating Custom I2C Software Applications"- Provides information for the custom usage of the board. * Chapter 5. "Troubleshooting"- Provides procedures for troubleshooting the most common problems encountered when installing and operating the board. * Appendix A. "Schematics and Layouts" - Shows the schematic and layout diagrams for the board. * Appendix B. "Bill of Materials (BOM)" - Lists the parts used to build the board. 2016 Microchip Technology Inc. DS50002480A-page 7 MCP2221 I2C Demonstration Board User's Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Initial caps Quotes Underlined, italic text with right angle bracket Bold characters N`Rnnnn Text in angle brackets < > Courier New font: Plain Courier New Represents Referenced books Emphasized text A window A dialog A menu selection A field name in a window or dialog A menu path MPLAB(R) IDE User's Guide ...is the only compiler... the Output window the Settings dialog select Enable Programmer "Save project before build" A dialog button A tab A number in verilog format, where N is the total number of digits, R is the radix and n is a digit. A key on the keyboard Click OK Click the Power tab 4`b0010, 2`hF1 Italic Courier New Sample source code Filenames File paths Keywords Command-line options Bit values Constants A variable argument Square brackets [ ] Optional arguments Curly brackets and pipe character: { | } Ellipses... Choice of mutually exclusive arguments; an OR selection Replaces repeated text Represents code supplied by user DS50002480A-page 8 Examples File>Save Press <Enter>, <F1> #define START autoexec.bat c:\mcc18\h _asm, _endasm, static -Opa+, -Opa0, 1 0xFF, `A' file.o, where file can be any valid filename mcc18 [options] file [options] errorlevel {0|1} var_name [, var_name...] void main (void) { ... } 2016 Microchip Technology Inc. Preface RECOMMENDED READING This user's guide describes how to use the MCP2221 I2C Demonstration Board. Other useful documents are listed below. The following Microchip documents are available and recommended as a supplemental reference resource. * MCP2221 Data Sheet - "USB 2.0 to I2CTM/UART/Protocol Converter with GPIO" (DS20005292) * PAC1710/20 Data Sheet - "Single and Dual High-Side Current-Sense Monitor with Power Calculation" (DS20005386) * MCP3221 Data Sheet - "Low-Power 12-Bit A/D Converter With I2CTM Interface" (DS21732) * MCP9808 Data Sheet - "0.5C Maximum Accuracy Digital Temperature Sensor" (DS25095) * PIC16(L)F1508/9 Data Sheet - "20-Pin Flash, 8-Bit Microcontrollers with XLP Technology" (DS40001609) * MCP4706/4716/4726 Data Sheet - "8-/10-/12-Bit Voltage Output Digital-to-Analog Converter with EEPROM and I2CTM Interface" (DS22272) * MCP23008/MCP23S08 Data Sheet - "8-Bit I/O Expander with Serial Interface" (DS21919) THE MICROCHIP WEB SITE Microchip provides online support via our web site at www.microchip.com. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: * Product Support - Data sheets and errata, application notes and sample programs, design resources, user's guides and hardware support documents, latest software releases and archived software * General Technical Support - Frequently Asked Questions (FAQs), technical support requests, online discussion groups, Microchip consultant program member listing * Business of Microchip - Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: * * * * Distributor or Representative Local Sales Office Field Application Engineer (FAE) Technical Support Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://www.microchip.com/support. DOCUMENT REVISION HISTORY Revision A (April 2016) * Initial release of this document. 2016 Microchip Technology Inc. DS50002480A-page 9 MCP2221 I2C Demonstration Board User's Guide NOTES: DS50002480A-page 10 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION This chapter provides an overview of the MCP2221 I2C Demonstration Board and covers the following topics: * MCP2221 I2C Demonstration Board Description * What the MCP2221 I2C Demonstration Board Kit Includes 1.2 MCP2221 I2C DEMONSTRATION BOARD DESCRIPTION The MCP2221 I2C Demonstration Board allows the user to communicate through a PC application to I2C slave devices by using the MCP2221 device as a USB to I2C 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 10) 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 2016 Microchip Technology Inc. DS50002480A-page 11 MCP2221 I2C Demonstration Board User's Guide 1.2.2 Other Hardware Features The board also provides features that are independent of the software application: * 5V or 3.3V user-selectable VDD, up to 500 mA operating capability for the demonstration board and all on-board devices. * I2C female socket (similar to the PICkitTM Serial Analyzer) for connectivity to external slaves, as well as test points for the I2C lines, and the option to disconnect the on-board, 4.7 k pull-up resistors for the I2C data and clock lines. * In-Circuit Serial ProgrammingTM (ICSPTM) male connector to debug or program the PIC16F1509 using a PICkit 3 programmer or another compatible tool. * The option to connect the PIC16F1509 device's Universal Asynchronous Receiver/Transmitter (UART) to the board's RS-232 connector (through the MAX3232 transceiver). * A small prototyping area which includes extensions of the board's power (VDD) and ground (GND) lines. * Test points to measure the current, voltage or power of non-USB devices (as well as receive configurable interrupts) using the PAC1710 current-sensing chip. * Option to connect the interrupt pin of the MCP23008 I/O expander to an external interrupt pin of the PIC16F1509 for custom applications. 1.2.3 I2C Devices Available on the Board Table 1-1 identifies the I2C devices (master and slaves) available on the MCP2221 I2C Demonstration Board. TABLE 1-1: Device Name MCP2221 DS50002480A-page 12 I2C DEVICES AVAILABLE ON THE MCP2221 BOARD I2C Master/Slave Master Description USB to I2C/UART/SMBus Protocol Converter with GPIO (Master Mode) PAC1710 Slave Single High-Side Current Sense Monitor with Power Calculation 24LC128 Slave 128-Kbit EEPROM MCP9808 Slave Temperature Sensor MCP3221 Slave 1-Channel, 12-Bit Analog-to-Digital Converter (ADC) MCP4726 Slave 12-Bit Digital-to-Analog Converter (DAC) MCP23008 Slave 8-Bit I/O Expander PIC16F1509 Slave 8-Bit Microcontroller (preprogrammed to perform as I2C slave) 2016 Microchip Technology Inc. Figure 1-1 illustrates the components on the top view. FIGURE 1-1: MCP2221 TOP VIEW - I2C DEVICES ON THE BOARD 24LC128 PAC1710 MCP3221 MCP9808 MCP23008 MCP4726 MCP2221 1.3 PIC16F1509 WHAT THE MCP2221 I2C DEMONSTRATION BOARD KIT INCLUDES The MCP2221 I2C Demonstration Board Kit (ADM00678) includes: * * * * MCP2221 I2C Demonstration Board Preprogrammed PIC16F1509 Microcontroller Two Mini-USB Cables Important Information Sheet 2016 Microchip Technology Inc. DS50002480A-page 13 MCP2221 I2C Demonstration Board User's Guide NOTES: DS50002480A-page 14 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Chapter 2. Installation and Operation 2.1 MINIMUM SYSTEM REQUIREMENTS The MCP2221 I2C Demonstration Board is designed to be used in a Microsoft(R) Windows(R) XP (SP3 or later) environment, based on the Microsoft.NET Framework 4 (client profile). Users can utilize the Microsoft.NET Framework 4 web installer package to download and install the Microsoft.NET Framework 4 components. For USB connectivity, the minimal physical requirement for the PC is a standard USB 2.0 port. The board connects to the PC via the mini-USB connector (J4). In case the board connects to the PC through a USB hub, use a self-powered hub. 2.2 BOARD SETUP Before the MCP2221 I2C Demonstration Board can be used, a few steps must be performed to install the PC software and configure the board's hardware. 2.2.1 Software Installation Follow these steps to install the required software: 1. Download the support material (PC application) that can be found on the board's page at www.microchip.com. 2. Unzip the archive and install the .exe file. The setup process should also perform the USB driver installation, if needed. If there are driver-related issues, refer to Section 5.2 "USB Driver Installation Issues". 2.2.2 Hardware Setup Follow these steps to set up the hardware: 1. Check if the board is properly powered from USB by setting jumper J19 to either 5V or 3.3V; by default, it is set to 5V. 2. Connect the MCP2221 I2C Demonstration Board to a PC through the mini-USB port (J4). 2016 Microchip Technology Inc. DS50002480A-page 15 JUMPERS AND CONNECTORS DESCRIPTION Refer to Figure 2-1 to view the default settings for the jumpers and connectors. FIGURE 2-1: DEFAULT JUMPERS AND CONNECTORS CONFIGURATIONS 1 6 2 3 7 4 8 5 9 2016 Microchip Technology Inc. Legend: 1 = Enable potentiometer R13 for MCP3221 ADC I2 6 = Enable LEDs, LD2-LD9, for MCP23008 GPIO expander 2 = Enable board's C pull-up resistors, R10 and R11 7 = Enable SDA (data) line of PIC16F1509 for I2C connectivity 3 = Connect UART RX of PIC16F1509 to UART TX of MCP2221 8 = Enable SCL (clock) line of PIC16F1509 for I2C connectivity 4 = Connect UART RX of MCP2221 to UART TX of PIC16F1509 9 = Enable RGB LED (connect to PIC16F1509) 5 = Set board voltage (VDD) to 5V MCP2221 I2C Demonstration Board User's Guide DS50002480A-page 16 2.3 Installation and Operation Table 2-1 describes the functions of all the board's jumpers and connectors. TABLE 2-1: MCP2221 BOARD JUMPERS CONFIGURATION Jumper Designator Function Description J1 PDIP socket for PIC16F1509 microcontroller. J2 Female connector to the MCP4726 Digital-to-Analog Converter; one pin is the DAC output and the other connects to the ground. J3 Male connector to the MCP4726 Digital-to-Analog Converter; one pin is the DAC output and the other connects to the ground. J4 Mini-B type USB female connector for power and connectivity for MCP2221 from the PC. J5 RS-232 female connector. J6 Jumper connecting the I2C SDA (data) pin of the PIC16F1509 to the board's SDA line. This jumper is connected by default. J7 Female connector to the MCP3221 Analog-to-Digital Converter; one pin is the ADC custom input and the other connects to the ground; for custom input, disconnect jumper J18. J8 Male connector to the MCP3221 Analog-to-Digital Converter; one pin is the ADC custom input and the other connects to the ground; for custom input, disconnect jumper J18. J9 Jumper connecting the I2C SCL (clock) pin of the PIC16F1509 to the board's SCL line. This jumper is connected by default. J10 Female connector for the MCP9808 temperature sensor. One pin connects to the sensor's ALERT pin and the other to the ground. J11 Male connector for the MCP9808 temperature sensor. One pin connects to the sensor's ALERT pin and the other to the ground. J12 Jumper for configuring the UART/RS-232 traffic directions: * MCP2221 to PIC16F1509: Short-circuit (RX MCU) with (TX USB), then (TX MCU) with (RX USB). This is the default setting. * MCP2221 to RS232: Short-circuit (RX RS-232) with (RX USB), then (TX RS-232) with (TX USB). * PIC16F1509 to RS232: Short-circuit (RX RS-232) with (RX MCU), then (TX RS-232) with (TX MCU). J13 Female connector for measuring resistances and capacitances. The `-' (minus) sign indicates the ground pin in case of measuring polarized capacitors. J14 Jumper enabling the RGB LED LD1 that connects to the PIC16F1509. The jumper is connected by default. J15 Jumper allowing the possibility to connect the interrupt pin of the MCP23008 I/O expander to pin RA2 of the PIC16F1509. The jumper is not connected by default (not populated). J16 Female connector to the eight I/O pins of the MCP23008 I/O expander. When using the connector, consider disabling the LEDs connected to the I/O pins by removing jumper J20. J17 Male connector to the eight I/O pins of the MCP23008 I/O expander. When using the connector, consider disabling the LEDs connected to the I/O pins by removing jumper J20. J18 Jumper connecting the potentiometer R13 to the ADC input pin of the MCP3221 DAC. Disconnect jumper to allow custom voltage measurements via connectors J7/J8. The jumper is connected by default. J19 Jumper for selecting the voltage level (VDD) of the board: connect left hand side and middle pins for 3.3V or middle and right hand side pins for 5V. The default setting is for 5V. J20 Jumper enabling LEDs LD2-LD9 that are connected to the I/O pins of the MCP23008 I/O expander; consider removing it if using connectors J16 and J17. The jumper is connected by default. J21 Mini-B type USB female connector used for measuring current, voltage and power with the PAC1710. This side goes towards the USB voltage source, such as a PC. J22 A type USB female connector used for measuring current/voltage/power with the PAC1710. Connect the USB device (load) through this jumper. J23 In-Circuit Serial ProgrammingTM (ICSPTM) connector for the PIC16F1509, compatible with the PICkitTM 3 debugger/programmer; the white triangle indicates the first pin (MCLR/VPP). 2016 Microchip Technology Inc. DS50002480A-page 17 MCP2221 I2C Demonstration Board User's Guide TABLE 2-1: MCP2221 BOARD JUMPERS CONFIGURATION (CONTINUED) Jumper Designator Function Description J24 Jumper enabling the 4.7 pull-up resistors for the I2C data (SDA) and clock (SCL) lines on the board. Consider removing it if the demonstration board connects to an external I2C slave circuit which already has I2C pull-up resistors. The jumper is connected by default. J25 I2C female connector; similar to the PICkitTM Serial Analyzer connector; however, this one only has the power and I2C lines (VDD, GND, SDA, SCL). The white triangle indicates the first pin. Pins 1 and 6 are not connected. 2.4 TEST POINTS DESCRIPTION Table 2-2 describes the board's test points. TABLE 2-2: MCP2221 BOARD TEST POINTS CONFIGURATION Test Point Designator Description TP1 Test point for measuring resistance or capacitance. If required, connect the positive pin of the polarized capacitor to this test point. TP2 Test point (connected to ground) for measuring resistance or capacitance. If required, connect the negative pin of the polarized capacitor to this test point. TP3 Test point for the ALERT pin of the PAC1710. This test point is not used by the demonstration board's application. TP4 Test point for the load side (target USB device) of the PAC1710 measuring circuit. TP5 Test point for the source side (USB Host/PC) of the PAC1710 measuring circuit. TP6 Test point for the I2C SDA line of the board. TP7 Test point for the I2C SCL line of the board. TP8 Test point connected to ground. DS50002480A-page 18 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Chapter 3. Testing Board Features This section describes the working principles and limitations that should be taken into account when using the board with the dedicated PC application, as well as the actual steps to use all of the demonstration kit's features. It is assumed that the user has already successfully run the installation process described in Section 2.2 "Board Setup". 3.1 ABOUT THE MPC2221 I2C DEMO BOARD APPLICATION The PC application for the device is named the MCP2221 I2C Demo Board Application. The three main sections that can be observed in Figure 3-1 are the Feature tabs, General Information panel and Setup area. FIGURE 3-1: THE MCP2221 I2C DEMO BOARD APPLICATION - INITIAL VIEW Feature Tabs 2016 Microchip Technology Inc. General Information Panel Setup Area DS50002480A-page 19 MCP2221 I2C Demonstration Board User's Guide For more information on the General Information panel, see Section 3.2 "General Information Panel Description". The Feature tabs determine the content of the Setup area. For more information, see Section 3.3 "Feature Tabs". 3.2 GENERAL INFORMATION PANEL DESCRIPTION 3.2.1 The Device Status Label The Device status label displays whether the board is connected to the PC. One of the following messages is generated by the system: * MCP2221 Connected * MCP2221 not Connected 3.2.2 The Using Custom VID/PID... Button When clicking the Using Custom VID/PID... button, the Select VID & PID window is displayed. The window contains information on the VID/PID combination to find the drivers that are to be used for the USB device. FIGURE 3-2: THE SELECT VID & PID WINDOW By default, the values are 0x4D8 for the VID and 0xDD for the PID. New values can be inserted in the "Look for VID (Hexadecimal Form)" and the "Look for PID (Hexadecimal Form)" fields. After inserting the new values, click the Update Settings button. Users can return to the default values by clicking the Use Default Values button. 3.2.3 The I2C Communication Status Box By default, the "I2C Communication Status" text box is blank. It is populated when actions are performed in the Feature tabs. The information is system-generated and read-only. Message examples include: "EEPROM write successful", "Pins states updated", "Settings saved" and others. If errors are displayed, see Section 5.4 "PC Application Reports I2C Errors". 3.2.4 The Clear I2C Status Box Button Click the Clear I2C Status Box button to clear the I2C Communication Status box. Note that clearing the text in the box does not cancel or revert any previously performed action. DS50002480A-page 20 2016 Microchip Technology Inc. Testing Board Features 3.2.5 The About Button Click the About button to open a window that contains information on the application's version and legal disclaimers. Click the OK button to close the window. FIGURE 3-3: 3.3 THE ABOUT WINDOW FEATURE TABS The left panel of the application contains nine tabs that allow the user to explore all the board's features: * * * * * * * * * Measure R, C Measure USB Power Measure Temperature Read/Write EEPROM Read ADC Configure DAC GPIO Expander RGB LED Notifications UART Communication Each tab displays a dedicated setting area when selected. 3.3.1 Measure R, C Tab Capacitance is determined by measuring the capacitor's charging time. In case of large capacitors, the charging time is software limited to 10 seconds, after which, a mathematical formula is applied to determine the approximate capacitance. The charging current is provided by a digital output pin of the MCP2221 board and limited by a 470 k resistor. The Measure R, C tab also generates a charging graph for the capacitor, as well as an indicator of its voltage. Resistance is determined by placing the unknown resistor in series with another known one, thus creating a voltage divider where relative voltage values are sufficient to calculate the resistance. Prior to performing measurements, the pins must be correctly placed in the connector marked with J13 or use the test points, TP1 and TP2. 2016 Microchip Technology Inc. DS50002480A-page 21 MCP2221 I2C Demonstration Board User's Guide 3.3.1.1 TAB OPERATION To measure a resistor or capacitor, select the Measure R, C tab. * Click the Measure Resistance button to measure the resistance. The system displays the approximate resistance and a capacitor charging graph. * Click the Measure Capacitance button to measure capacitance. The system displays the approximate capacitance and a capacitor charging graph. Note: In case of a polarized capacitor, make sure the pins are correctly placed - the `+' (plus) and `-' (minus) signs on the board must be next to connectors, J13 and TP2. Figure 3-4 shows an example of measuring resistance. FIGURE 3-4: MEASURING RESISTANCE 3.3.1.2 CONSIDERATIONS AND WARNINGS * The minimum supported values are around 10 for resistors and 40 nF for capacitors. * To maintain a certain level of accuracy, the maximum recommended values to measure are ~1 M for resistors and 470 F for capacitors. * The measurement accuracy may be, in some cases, of about 10%, therefore the MCP2221 I2C Demonstration Board Kit is not recommended for precision measurements. * For both capacitor and resistance measurements, voltages are generated by digital output pins and measured using the analog input pins of the MCP2221 I2C Demonstration Board. DS50002480A-page 22 2016 Microchip Technology Inc. Testing Board Features 3.3.2 Measure USB Power Tab The Measure USB Power tab allows users to perform current, voltage or power measurements of a USB device. Prior to measuring the current/power of the USB device, make sure that: * The load to be measured (for example a USB mouse) is connected to the MCP2221 board's USB socket marked with J22 * The power source (such as the PC) is connected to the mini-USB socket marked with J21 3.3.2.1 TAB OPERATION Users can determine what measurements the system should perform by selecting at least one of the following check boxes: "Chart Voltage", "Chart Current" or "Chart Power". The "Show Numbers" check box determines whether numerical values for voltage, current and power will also be indicated in real time inside its corresponding text box. If the check box is selected, current and power will be indicated in real time. Generated data can be saved using the "Log into .CSV File ..." check box. When the check box is selected, the Open window opens to allow users to select the .csv file or create a new document, where the measured data can be logged. Figure 3-5 depicts this action. FIGURE 3-5: SELECTING A .csv FILE It is advisable to use comma separated values for the.csv file type to be Microsoft(R) Excel(R) compatible.The .csv file is generated by the application, with four columns, and each set of readings is placed on a row. The columns are: Data entry index, Voltage (in Volts), Current (in Amps), Power (in Watts). Logging can be turned off by clearing the check box. 2016 Microchip Technology Inc. DS50002480A-page 23 MCP2221 I2C Demonstration Board User's Guide Click the Start Measurement button for the system to start performing measurements. Pressing the Stop Measurement button interrupts the measurements.The Reset Measurement button clears all the previously generated data and prepares the system for new measurements. The Measure All One Time button is for the application to retrieve, in real time, just one set of numeric values (for voltage, current and power) and to write them in the corresponding text box below it. This can be used as an alternate solution to Start Measurement in order to save system resources. Figure 3-6 shows an example for measuring the current, voltage and power of a USB Flash drive when connected to the PC via the measuring circuit. FIGURE 3-6: DS50002480A-page 24 MEASURING CURRENT, VOLTAGE AND POWER OF A USB DEVICE 2016 Microchip Technology Inc. Testing Board Features 3.3.2.2 WARNINGS AND CONSIDERATIONS * When measuring the current/power consumption, it is recommended to connect the loads (devices) that do not draw a current above ~2.5A. * A shunt resistor of 0.025 is used, which sets the PAC1710 chip's full-scale current value to 3.2A. However, current limitations are also imposed by the MCP2221 board's design. * In case of continuous measurement, samples are taken once every 100 milliseconds, so higher frequency variations may not be noticed by the application. * The software provides the option not to display specific variations (such as populating the voltage graph, for example) to reduce the amount of tasks that the PC must perform. This is especially useful when the PC is running low on system resources (like processor usage or memory filling). * Even when switching to a different tab (such as measuring resistors), if the monitoring is enabled, then it will not be automatically halted unless the board is physically disconnected from the PC. Therefore, it is recommended to stop performing the measurements when they are no longer required. 3.3.2.3 NOTIFICATIONS FUNCTIONALITY The MCP2221 board also provides three access points (TP3, TP4 and TP5), described in Section 2.3 "Jumpers and Connectors Description". The PAC1710 chip can be configured to signal notifications via the ALERT pin that's connected to the TP3 test point of the MCP2221 I2C Demonstration Board. For custom measurements, it's highly recommended to read the data sheet for the PAC1710 chip, as well as view the schematic and layouts of the board, available in Appendix A. "Schematics and Layouts" of this document. 3.3.3 Measure Temperature Tab The temperature sensor is built into the MCP9808 chip. The sensor's accuracy depends on the temperature value intervals, as seen in the following table: Temperature Value Intervals Accuracy -40C to +125C -20C to +100C -40C to +125C 0.25 (typical) 0.5C (maximum) 1C (maximum) In the case of continuous monitoring, samples are taken once every 100 milliseconds, so higher frequency variations may not be noticed by the software. The software provides the option not to display specific variations (for example, populating the temperature graph) to reduce the amount of tasks that the PC must perform. This is especially useful when the PC is running low on system resources (such as processor usage or memory filling). Even when switching to a different application tab, if the monitoring is enabled, then it will not be automatically halted unless the board is physically disconnected from the PC. Therefore, it is recommended to stop performing the measurements when they are no longer required. 2016 Microchip Technology Inc. DS50002480A-page 25 MCP2221 I2C Demonstration Board User's Guide 3.3.3.1 TAB OPERATION The Measure Temperature tab allows users to perform temperature measurements. The "Show in Chart" check box determines if a graph is displayed during the real-time measurements. Users can choose the measuring unit (Fahrenheit or Celsius) inside the "Unit" radio button group. The functionalities of the "Show Numbers" and the "Log into .CSV File..." check boxes are similar to the ones described in Section 3.3.2 "Measure USB Power Tab". However, the .csv file contains two columns and each set of readings is placed on a row. The columns are: Data entry index and Temperature. The functionalities of the Start Measurement, Stop Measurement and Reset Measurement buttons are similar to the ones described in Section 3.3.2 "Measure USB Power Tab". Click the Measure Temperature Once button for the application to retrieve, in real time, just one set of numeric values (for temperature) and to write them in the corresponding text box below it. This can be used as an alternate solution to Measure Temperature, in order to save system resources. For example, the application can be set so that temperatures exceeding 26C will result in an orange LED blinking on the board. Custom LED notifications are described in Section 3.3.8 "RGB LED Notifications Tab". Figure 3-7 shows an example for measuring the temperature in C. FIGURE 3-7: DS50002480A-page 26 TEMPERATURE MEASUREMENT 2016 Microchip Technology Inc. Testing Board Features 3.3.3.2 NOTIFICATIONS FUNCTIONALITY The MCP9808 temperature sensor can be configured to output an alert signal when the temperature changes beyond the specified boundary limits. The signal can be read on the MCP2221 board through the pin extensions marked with J10 and J11. More information is available in Section 2.3 "Jumpers and Connectors Description". 3.3.4 Read/Write EEPROM Tab The 24LC128 EEPROM is organized into 256 pages of memory (numbered from 0 to 255), each containing 64 bytes of data. The MCP2221 I2C Demo Board Application displays the memory content per page, organized in a matrix of 16 rows and 4 columns. Data and addresses are displayed in hexadecimal form. The last page of the EEPROM, page 255, is also used to store the LED notifications configuration that is described in Section 3.3.8 "RGB LED Notifications Tab". By default, all the memory bytes are set as 0xFF. Writing to a data cell will cause the EEPROM to rewrite the cell's entire page. 3.3.4.1 TAB OPERATION Follow these steps to write to a specific cell or page of the EEPROM: 1. Select the Read/Write EEPROM tab. 2. From the "Select Page" drop-down, choose the EEPROM memory page you want to read or write. 3. The address of the cell can be determined by adding the column and row indexes in the matrix table below. Edit a cell by double-clicking on it and entering the 8-bit value in hexadecimal form (example: for 0x1C, write 1C). Users must enter a valid number in hexadecimal form, between 0x00 and 0xFF. 4. To update the EEPROM content, click the Write Page button. Figure 3-8 shows an example of writing the 0x1A value to address 0x1D0 (Memory Page Number 7). 2016 Microchip Technology Inc. DS50002480A-page 27 MCP2221 I2C Demonstration Board User's Guide FIGURE 3-8: WRITING INTO THE EEPROM To read an EEPROM page: 1. Select the desired page number from the "Select Page" drop-down. 2. Click the Read Page button. The Erase All EEPROM Data button resets the entire content of the EEPROM to 0xFF. The Reset Entire Table to 0xFF button only affects the displayed matrix, not the actual EEPROM memory. DS50002480A-page 28 2016 Microchip Technology Inc. Testing Board Features 3.3.5 Read ADC Tab The MCP3221 Analog-to-Digital Converter uses both a fixed 2.5V voltage reference and the power supply from an MCP1525 voltage reference chip, which allows the conversion to be independent of the demo board's power line: 3.3V/5V. Therefore, the analog voltage to be measured must be between 0 and 2.5V. The board can be used to measure the voltage from: * Potentiometer R13, from the 2.5V supply that's also powering the MCP3221 if jumper J18 is connected (the default setting); or * An external source (via J7 and J8) if jumper J18 is disconnected. In case of continuous monitoring, samples are taken once per 100 milliseconds, so higher frequency variations may not be noticed by the PC application. The software provides the option not to display specific variations (such as populating the ADC graph) to reduce the amount of tasks that the PC must perform. This is especially useful when the PC is running low on system resources (such as processor usage or memory filling). Even when switching to a different application tab, if the monitoring is enabled, then it will not be automatically halted unless the board is physically disconnected from the PC. Therefore, it is recommended to stop performing the measurements when they are no longer required. Prior to performing measurements, make sure to select the analog voltage source by connecting or removing jumper J18. See Table 2-1 for more information. 3.3.5.1 TAB OPERATION Select the Read ADC tab to perform ADC measurements. The "Show in Chart" check box determines whether a chart is generated by the system to illustrate the measured values. The functionalities of the "Show numbers" and the "Log into .CSV File..." check boxes are similar to the ones described in Section 3.3.2 "Measure USB Power Tab". However, the .csv file contains two columns and each set of readings is placed on a row. The columns are: Data entry index, Voltage (in Volts). The functionalities of the Start Measurement, Stop Measurement and Reset Measurement buttons are similar to the ones described in Section 3.3.2 "Measure USB Power Tab". The Measure ADC Voltage Once button is for the application to retrieve, in real time, just one set of numeric values (for voltage) and to write them inside the text box below it. This can be used as an alternate solution to Start Measurement in order to save system resources. Custom LED notifications (for example: voltage readings above 2.31V results in a green LED blinking on the board) are described in Section 3.3.8 "RGB LED Notifications Tab". 2016 Microchip Technology Inc. DS50002480A-page 29 MCP2221 I2C Demonstration Board User's Guide Figure 3-9 shows an example for measuring the voltage: FIGURE 3-9: DS50002480A-page 30 VOLTAGE MEASUREMENT 2016 Microchip Technology Inc. Testing Board Features 3.3.6 Configure DAC Tab The MCP4726 DAC (Digital-to-Analog Converter) uses an MCP1525 as a 2.5V voltage reference, thus allowing it to generate a fixed voltage no matter if the board's power (VDD) is set to 3.3V or 5V. The MCP4726 also has the option to set a 2x reference gain, which means that only if the MCP2221 I2C Demonstration Board works at 5V (jumper J19 is set to 5V), then the analog voltage output can be as high as 5V. This option can be enabled from the PC application. 3.3.6.1 TAB OPERATION Follow these steps to set the voltage value for the DAC: 1. Select the Configure DAC tab. 2. From the Select Reference Voltage radio button group, choose the preferred voltage. The default value is 2.5V. Note that users should only select 5V if the VDD value is 5V. 3. To set the output voltage, use one of the following formats: - Inside the text box corresponding to the "Write Value in Volts" text box, type in the numeric value; or - Select the "Set Voltage in Real Time" check box, then adjust the slider. The resulting values will be shown in the text box corresponding to "Write Value in Volts (Example: 2.35)" label. Use a period (.) and not a comma (,) to write the value. 4. Regardless of the method used to set the output voltage, the voltages are only submitted to the board after the user clicks the Set Voltage button. The value is also displayed below the "Current Voltage" label, inside the corresponding read-only text box. 5. To read the output voltage value back from the chip's register, click the Read Voltage Data button. The value is displayed in the read-only text box, below the "Current Voltage" label. 2016 Microchip Technology Inc. DS50002480A-page 31 MCP2221 I2C Demonstration Board User's Guide Figure 3-10 shows how to configure the DAC to output 1.45V. FIGURE 3-10: CONFIGURING THE DIGITAL-TO-ANALOG CONVERTER 3.3.7 Digital I/O Pins Tab The MCP23008 pin expander provides access to eight configurable digital input/output pins. Short-circuiting jumper J20 connects LEDs, LD2, LD3,...,LD9, to the eight pins. The eight general purpose pins are also accessible via connectors J16 and J17. For example, if a pin is configured as an output and intended to be connected to an external circuit or component via J16 or J17, it may help to remove jumper J20 in order to preserve the pin's current driving strength. In case a pin is used as a digital input, a logical high input signal should match the demonstration board's power level (3.3V or 5V, determined via jumper J19). For more information on voltage tolerances, see the "MCP23008/MCP23S08 Data Sheet" (DS21919). Even when switching to a different application tab (such as for measuring resistors), if the pin state monitoring (auto-read) is enabled, then it will not be automatically halted unless the board is physically disconnected from the PC. Therefore, it is recommended to stop performing the readings when they are no longer required. Custom LED notifications for pin GP0 (for example: the pin having a logical high state results in a yellow LED blinking on the board) are described in Section 3.3.8 "RGB LED Notifications Tab". DS50002480A-page 32 2016 Microchip Technology Inc. Testing Board Features 3.3.7.1 TAB OPERATION To control the digital I/O pins, follow these steps: 1. Select the GPIO Expander tab. 2. Configure the pin directions (input or output) under the "Set GPIO Direction" section. The configuration only becomes active after the user clicks the Submit Pin Directions button. 3. For the pins that are set as outputs, the "Configure Pin State (if Output)" section allows the user to change their state in one of the following ways: - All at once, if the "Instant Command" check box is cleared and when clicking the Submit Pin States button; or - Individually (real-time state toggling), the "Instant Command" check box is selected. In case a pin is configured as an input, these pin state control commands are ignored. Reading the states for all eight general purpose pins can be done by either: * Automatically (continuously, every 100 milliseconds), in case the "Auto Read Every 100ms" check box is selected; or * Manually, by clicking on the Read Pin States button. Figure 3-11 shows an example of using the GPIO Expander tab. FIGURE 3-11: INTERFACING THE GPIO EXPANDER 2016 Microchip Technology Inc. DS50002480A-page 33 MCP2221 I2C Demonstration Board User's Guide 3.3.7.2 UNIMPLEMENTED FEATURES The MCP23008 also has a separate interrupt output pin which can be used to signal to the I2C master, a logical state change of one of its input pins. By default, the interrupt pin is not connected to the MCP3221. It can be connected to the RA2 pin of the PIC16F1509 by short-circuiting jumper J15, in case of a custom application, where, for example, the PIC16F1509 is programmed to perform as an I2C master. 3.3.8 RGB LED Notifications Tab LED notifications can be configured to indicate certain events related to the readings described in the previous sections. The LED can indicate events every 500 milliseconds (including 100 milliseconds of specific color) allocated per I2C device: * * * * PAC1710 USB voltage, current or power consumption MCP9808 temperature sensor MCP3221 analog voltage value MCP23008 GP0 pin state change In the remaining 100 milliseconds from one time period, the LED will be powered off. In case a device does not have notifications enabled for its corresponding time interval, the LED will also be powered off. As a general observation, higher frequency events may not be noticed in time to be signaled by the LED. Notifications are done using the RGB LED LD1, that is fully controlled by three Pulse-Width Modulation (PWM) pins of the PIC16F1509, which receives commands (as I2C slave) from the MCP2221 DLL through the MCP2221 board. The LED color and brightness are configured from the PC application. It is recommended to avoid light color tones, because they can translate into very intense LED brightness. Prior to attempting to configure the LED notifications, make sure that: * The PIC16F1509 microcontroller is present in socket J1 and that it can communicate via I2C (jumpers J6 and J9 must be connected) * Jumper 14 is connected to enable the RGB LED LD1 DS50002480A-page 34 2016 Microchip Technology Inc. Testing Board Features 3.3.8.1 TAB OPERATION Follow these steps to enable a notification: 1. Open the RGB LED Notifications tab. 2. The Preview Color... button brings up the Color window, allowing users to choose colors. FIGURE 3-12: COLOR WINDOW 3. After selecting the desired colors, click the OK button and the system changes the LED color accordingly. 4. To enable a specific notification, select the color you want in the "Blink" radio button group corresponding to the notification. You can either: - Select the default color (blue, red, green or white) available for each of the four notifications; or - Set any color by selecting the "custom color..." radio button. In the Color window (Figure 3-12), choose one of the basic colors or define a new color and click OK. 5. Set the notification conditions, including the numeric value for comparison, if applicable. 6. Click the corresponding "Enable" check box. 7. Optional. Users can also click the Save Preferences into EERPROM button to save the current created configuration inside the 24LC128 EEPROM that's on the MCP2221 board (data is stored inside its last memory page, 255). Also, the Load Preferences from EEPROM button can be used to restore configurations from the EEPROM. Note: 2016 Microchip Technology Inc. Changing a numeric value used for the comparison will clear the "Enable" check box. DS50002480A-page 35 MCP2221 I2C Demonstration Board User's Guide Figure 3-13 shows how the LED is configured to blink (blue color) in case the measured USB current exceeds 85 mA. FIGURE 3-13: DS50002480A-page 36 CONFIGURING LED NOTIFICATIONS 2016 Microchip Technology Inc. Testing Board Features 3.3.9 UART Communication Tab There are several combinations of connectivity, which are determined through jumper J12: * (Default Setting): MCP2221 (from PC) to PIC16F1509. Every time the PIC(R) microcontroller receives a character from the MCP2221, it increments its value and sends it back. * MCP2221 (from PC) to RS-232 connector. * PIC16F1509 to RS-232. Unless the PIC microcontroller is reprogrammed, it will behave the same as in Case 1 described above. For the first two cases, data loss (sent or received) may be noticed inside the PC application's text box due to the nature of the .NET Framework that is used by the application. A work around is to use a third-party PC application for COM port bridging. 3.3.9.1 TAB OPERATION To receive information on the COM ports present in the system, follow these steps: 1. Open the UART Communication tab. 2. Click the Get COM Ports Info button for the system to display information (in the text box below it) about the COM ports present in the system; this can be used to determine the COM port number of the MCP2221 USB to I2C/UART converter from the demonstration board. 3. Select the COM port number from the drop-down box. The system will populate the "Baud:", "Data Bits:" and "Stop Bits:" fields. For example, the settings in the case of communication between MCP2221 and PIC16F1509 (determined through jumper J12) are: Baud: 9600, Data Bits: 8, Stop Bits: 1. 4. Open the COM port by clicking the Open Port button. 5. Received data is automatically added inside the read-only text box on the right-hand side as red colored text. To send data, follow these steps: 1. Open the UART Communication tab. 2. Enter the information you want to communicate in the text boxes corresponding to the Text 1, Text Line 2 and Text Line 3 buttons, under the "Send data:" section. 3. "Sent data:" can be seen inside the read-only text box on the right-hand side (combined with the received data) if the "Show Sent Data" check box is selected. 4. The buttons, Text Line 2 and Text Line 3, place the sent/received data on a new line inside the text box. 5. To clear the text box, click the Clear Serial Data Box button. 2016 Microchip Technology Inc. DS50002480A-page 37 MCP2221 I2C Demonstration Board User's Guide Figure 3-14 shows an example of sending the text `12' to the PIC microcontroller and receiving `23' back. FIGURE 3-14: DS50002480A-page 38 UART COMMUNICATION WITH THE PIC16F1509 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Chapter 4. Creating Custom I2C Software Applications This chapter provides a few suggestions on how to get started in developing custom applications that involve I2C communication, using the MCP2221 I2C Demonstration Board. Section 4.1 "USB to I2C": The MCP2221 is the I2C master and the Graphical User Interface (GUI) lies on a USB Host (such as a PC or Android device). Section 4.2 "PIC16F1509 as I2C Master": The PIC16F1509 which is available on the board (or a pin-compatible PIC(R) microcontroller) is presumed to be the I2C master, while also using (or not) the MCP2221. Section 4.3 "I2C Slave Addresses": Lists the I2C slave addresses of the devices found on the demonstration board. 4.1 USB TO I2C This section discusses two aspects of a USB to I2C custom application: * Interfacing the MCP2221 I2C Demonstration Board from a different PC application, or even, an operating system. * Connecting external I2C slaves to the MCP2221 I2C Demonstration Board. 4.1.1 Using a Different Operating System or Application The MCP2221 can be accessed via USB from several types of operating systems: Windows(R), Linux(R), Mac(R) or Android. The required USB drivers and related information are available on the MCP2221 official web site. Also available for download are several applications that can be used for I2C transfer and for GPIO pin configuration, such as the MCP2221 I2C/SMBus Terminal for Windows or the MCP2221 Terminal Android Application for Android. In order to create a custom application (GUI), the user can call the MCP2221 associated functions (for its configuration or actual data transfer) through the DLL files that can be downloaded from the same location. For Android, the source code for the application and the available libraries can be used as a basis for developing a new application. See the "Recommended Reading" section for more information on the I2C slave devices. 4.1.2 Connecting External I2C Slaves to the Board The MCP2221 I2C Demonstration Board also provides the possibility to connect external I2C slave devices using the female connector J25. This is same as the one from the PICkitTM Serial Analyzer in terms of I2C connectivity. The white colored triangle indicates the first pin of the socket. 2016 Microchip Technology Inc. DS50002480A-page 39 MCP2221 I2C Demonstration Board User's Guide These are the pin designations: - Pin 1: Not connected - Pin 2: VDD (power) must be provided by the I2C demonstration board and it is user-selectable (3.3V or 5V via jumper J19) - Pin 3: GND (ground connection) - Pin 4: SDA (I2C data line) - Pin 5: SCL (I2C clock line) - Pin 6: Not connected Additional test points are available in the case, for example, of connecting a logical analyzer to the demo board's I2C bus: - TP6: Test point connected to the I2C data line - TP7: Test point connected to the I2C clock line - TP8: Test point connected to ground Note: 4.2 If the externally connected I2C slave already has its own pull-up resistors connected to the I2C data and clock lines, the ones available on the demo board can be disconnected by removing jumper J24. PIC16F1509 AS I2C MASTER There may be the case where it is desirable to have the PIC16F1509 microcontroller as the I2C master with no required USB communication. This section contains information related to the hardware connectivity (power supply and I2C communication), as well as programming the PIC16F1509. 4.2.1 Hardware Connectivity For powering the board, there are two possibilities: 1. From the PC, via the mini-USB connector J4 (USB Host) or a from a USB charger adapter that provides a constant 5V (DC) and at a recommended minimum of 200 mA. In this case, the board's voltage level can be set to either 3.3V or 5V, depending on how jumper J19 is connected. 2. By connecting an external power supply (between 3.3V and 5V) to the board's VDD power line, ideally through: * The VDD pin that is available on the ICSPTM (In-Circuit Serial ProgrammingTM) connector marked with J23; or * The VDD pin that is available on the female connector J25. Note: In case a power supply is connected directly to the VDD line, jumper J19 should be completely disconnected to avoid unwanted current flow. This flow could affect the board's MCP1825 voltage regulator or the USB connector marked with J4. To enable I2C communication, make sure that: * The PIC16F1509 connects to the I2C bus by short-circuiting jumpers J6 and J9. * The I2C data and clock lines' pull-up resistors are connected; if no pull-up resistors are externally connected to the board, then jumper J24 must be connected. DS50000000A-page 40 2016 Microchip Technology Inc. Creating Custom I2C Software Applications 4.2.2 Programming the PIC16F1509 The PIC16F1509 can be programmed via the ICSP (In-Circuit Serial Programming) connector marked with J23, with tools such as the PICkitTM 3 or compatible debuggers/programmers. In case there are programming issues, consult Chapter 5. "Troubleshooting" in this document. The source code for the PIC microcontroller can be written using MPLAB(R) X IDE and the XC8 C compiler that are available for download at http://www.microchip.com. Part of the code, including for the I2C master, can be generated automatically using the MPLAB Code Configurator plug-in. 4.3 I2C SLAVE ADDRESSES This section lists the addresses of the I2C slave devices that are available on the demonstration board. The values displayed in Table 4-1 are in the 8-bit form and can be used directly as parameters during application development when calling the MCP2221.DLL functions. The 8-bit equivalent (write address) of a 7-bit I2C address is the result of a left-shift-once (or multiplication by 2) of the 7-bit address. TABLE 4-1: LIST OF I2C SLAVE ADDRESSES Device I2C Write 8-Bit Address I2C Read 8-Bit Address 24LC128 0xA0 0xA1 MCP23008 0x40 0x41 MCP3221 0x9A 0x9B MCP4726 0xC0 0xC1 MCP9808 0x32 0x33 PAC1710 0x5C 0x5D PIC16F1509 0x10 0x11 2016 Microchip Technology Inc. DS50000000A-page 41 MCP2221 I2C Demonstration Board User's Guide NOTES: DS50000000A-page 42 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Chapter 5. Troubleshooting This chapter handles a number of possible scenarios that may occur when the MCP2221 I2C Demonstration Board does not function as expected. 5.1 BOARD NOT DETECTED BY PC In case the PC does not signal, either visually or acoustically, that the MCP2221 board has been connected, perform the following actions: * Check the board's power selection jumper. Make sure jumper J19 is connected and that its default position is for 5V operation. * Connect the PC to the correct on-board mini-USB socket. The board communicates with the PC and it is also powered using the mini-USB connector marked with J4, not J21. * Verify that enough power is provided to the board. If the board connects through a USB hub, then the hub should be self-powered. 5.2 USB DRIVER INSTALLATION ISSUES When connecting the MCP2221 board to a PC running a Windows(R) operating system, the USB driver should install automatically. In case the process is not successful, the driver can be downloaded from http://www.microchip.com/mcp2221, extracted to a folder on the local drive and then installed manually, as described below. 1. From the Start menu, select Control Panel>Device Manager. Connect the board to the PC and see what device is added to the list under Ports. 2. Right-click on the device and click the Update Driver Software... button. 3. Manually select the folder where the driver has been extracted. 4. Click OK. After the driver installs, a system restart may be required. 5.3 PC APPLICATION REPORTS "MCP2221 NOT CONNECTED" When a USB device (such as the MCP2221) connects to the USB Host (such as the PC), the host will ask for the device's Product and Vendor IDs (VID & PID). The default values for the MCP2221 are 0x4D8 and 0xDD. In case any of these values has been changed by the user, and the USB.inf driver file has been customized accordingly and has been installed properly, then the PC application will report the "MCP2221 not connected" error message. In such a case, the application can be configured to look for a device with custom values by clicking the Using Custom VID/PID... button. Note: 2016 Microchip Technology Inc. The MCP2221 I2C Demo Board Application does not rewrite the VID & PID inside the MCP2221 board. This can be done using the MCP2221 Utility which can be downloaded from http://www.microchip.com. However, extra knowledge in terms of legal and technical implications is required. DS50002480A-page 43 MCP2221 I2C Demonstration Board User's Guide 5.4 PC APPLICATION REPORTS I2C ERRORS If the text box corresponding to the I2C Communication Status label indicates an error followed by a number, then the physical and logical setup of the I2C bus should be checked. Perform the following verifications: * Check the pull-up resistors. External I2C circuits connected to the MCP2221 I2C Demonstration Board may have their own pull-up resistors for the I2C data and clock lines, in which case, jumper J24 should be removed depending on the resulting resistances; otherwise, J24 must be connected. * Check for slave address conflicts. In case there are external I2C slaves connected to the board, make sure there are no overlapping addresses. The list of addresses of the devices available on the board is detailed in Section 4.3 "I2C Slave Addresses of this document. * Check the I2C error codes. The codes are available inside the "MCP2221 Breakout Module User's Guide" (DS50002282, package version 06/17/2015) available at www.microchip.com. 5.5 ISSUES PROGRAMMING THE PIC(R) MICROCONTROLLER In case the PICkitTM 3 (or another Microchip debugger/programmer compatible to the PIC microcontroller) is configured to provide power to the target device, but reports that PIC16F1509 cannot be programmed, the cause may be that the PICkit 3 cannot provide enough power to the PIC device. In such a case, it is recommended to power the MCP2221 board externally through: * The mini-USB connector marked as J19 (as opposed to powering from the PICkit 3) from the PC; or * A USB charger that provides a constant 5V (DC) at a recommended minimum of 200 mA if the microcontroller supports this voltage level. DS50002480A-page 44 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Appendix A. Schematics and Layouts A.1 INTRODUCTION This appendix contains the schematics and layouts for the following devices which are included in the MCP2221 I2C Demonstration Board Kit (ADM00678): * * * * * * * * Board - Interface Schematic Board - Slaves Schematic Board - Top Silk Board - Top Copper and Silk Board - Top Copper Board - Bottom Copper Board - Bottom Copper and Silk Board - Bottom Silk 2016 Microchip Technology Inc. DS50002480A-page 45 BOARD - INTERFACE SCHEMATIC USB connector for MCP2221 VDD 10k 0603 5% GP0 GP1 RESET RX_MCP TX_MCP C14 0.1uF 16V 0603 GP2 VDD GP0 GP1 RST UART RX UART TX GP2 VSS D+ DVUSB SCL SDA GP3 14 13 12 11 10 9 8 5V D_P D_N VUSB SCL SDA GP3 GND 10k 0603 1% R6 10k 0603 1% J4 1 2 3 4 5 VBUS DD+ ID GND C15 4.7uF 10V 0603 0.47uF 6.3V 0603 USB Mini-B GND GND 1 MCP1825 VIN C16 VOUT GND 2 0.1uF 16V 0603 GND GND 3 5V VDD TP8 VUSB SCL SDA TP LOOP Black C17 4.7uF 10V 0603 I2C Pull-Up Resistors VDD VDD U2 5V I2C bus pinouts GND J19 SCL HDR-2.54 Male 1x3 TP7 TP LOOP Black GND SDA 6 5 4 3 2 1 J25 J24 2 1 HDR-2.54 Male 1x2 HDR-2.54 Female 1x6 TP6 TP LOOP Black R10 R11 SCL SDA 4.7k 0603 5% GND GND R4 R5 D_N D_P C2 MCP2221 R3 10k 0603 1% GND U3 0 1 2 3 4 5 6 7 R2 Power module 1 2 3 MCP2221 and R/C measurement circuit VDD 4.7k 0603 5% 470k 0603 1% TP1 TP LOOP Black PIC16F1509 microcontroller ICSP connector TP2 GND TP LOOP Black 1 2 VDD GND HDR-2.54 Female 1x2 J1 J13 C21 R1 0.1uF 16V 0603 GND MAX3232 UART adapter and RS-232 connector J23 1 VDD 2 RA5 3 RA4 MCLR/RA3 4 5 RC5 6 RC4 7 RC3 8 RC6 9 RC7 TX_PIC/RB7 10 20 19 18 17 16 15 14 13 12 11 10k 0603 5% VSS RA0/ICSPDAT RA1/ICSPCLK RA2 RC0 RC1 RC2 RB4 RX_PIC/RB5 RB6 1 2 3 4 5 6 GND SDA 1 2 MCLR/RA3 VDD VSS RA0/ICSPDAT RA1/ICSPCLK HDR-2.54 Male 1x6 J6 HDR-2.54 Male 1x2 SCL UART connectivity selection jumpers MCP23008 interrupt pin to PIC 1 2 J9 0.1uF 16V 0603 C5 2016 Microchip Technology Inc. 0.1uF 16V 0603 GND 1 2 3 4 5 6 7 8 U1 16 C1+ VCC 15 V+ GND 14 C1DOUT1 13 C2+ RIN1 12 C2ROUT1 11 VDIN1 10 DOUT2 DIN2 9 RIN2 ROUT2 4 5 6 HDR-2.54 Male 2x4 1 6 2 7 3 8 4 9 5 GND RX_MAX TX_MAX MAX3232 GND J5 DE-9 Female 1 2 HDR-2.54 Male 1x2 R9 2.7k 0603 5% RA2 J15 LD1 LED_RGB CLX6A-FKB-CK1P1G1BB7R3R3 GND HDR-2.54 Male 1x2 J14 IO_INT 1 2 3 0.1uF 16V 0603 3.3k 0603 5% 2 C3 C1 TX_MCP TX_PIC/RB7 TX_MAX R8 1.5k 0603 5% GREEN 0.1uF 16V 0603 R7 7 5 3 1 1 0.1uF 16V 0603 RX_PIC/RB5 RX_MCP RX_MAX C6 C4 8 6 4 2 BLUE VDD J12 RED VDD HDR-2.54 Male 1x2 MCP2221 I2C Demonstration Board User's Guide DS50002480A-page 46 A.2 BOARD - SLAVES SCHEMATIC GND TP LOOP Black GND TP LOOP Black 10 9 8 7 6 GND SCL SDA R21 20k 0603 5% U6 VDD SMCLK SMDATA ALERT# ADDR_SEL SENSE+ SENSENC1 NC2 GND PAC1710 R17 SENSE_N 0.025R 2512 1% TP4 TP LOOP Black 1 2 3 4 5 1 2 3 4 5 VBUS DD+ ID GND SENSE_P SENSE_N 1 VBUS 2 D3 D+ 4 GND C8 GND 8 0.1uF 16V 0603 USB-A Female USB Mini-B 1 A0 2 A1 3 A2 VDD WP 6 SCL 5 SDA VCC GND GND 7 VSS U5 MCP9808 1 SDA 2 SCL TMP_ALERT3 SCL SDA 4 SDA SCL Alert GND 4 VDD 8 VDD 7 A0 6 A1 5 A2 GND GND J10 C7 0.1uF 16V 0603 HDR-2.54 Female 1x2 GND GND J11 TMP_ALERT 1 2 SENSE_P 24LC128 0 TP3 1uF 10V 0603 GND1 0.1uF 16V 0603 C19 MCP9808 Temperature sensor U4 J22 0 TP5 C18 24LC128 EEPROM J21 1 2 PAC1710 USB current and power measurer VDD 11 2016 Microchip Technology Inc. A.3 HDR-2.54 Male 1x2 GND GND GND MCP3221 ADC MCP4726 DAC U7 1uF 10V 0603 U9 MCP3221 GND GND 1 2 3 R13 ANALOG_IN 10k 3386F 10% 1 2 J7 1 5 VDD SCL 2 VSS 3 4 AIN SDA SCL SDA J8 ANALOG_IN HDR-2.54 Female 1x2 C11 0.1uF 16V 0603 HDR-2.54 Male 1x2 GND GND GND J18 HDR-2.54 Male 1x2 GND DAC_OUT VDD C10 3 0.1uF 16V 0603 1 6 VOUT VREF 2 5 VSS SCL 3 4 VDD SDA SCL SDA J2 GND VDD C12 0.1uF 16V 0603 GND HDR-2.54 Female 1x2 U10 1 MCP1525 VIN J3 DAC_OUT VOUT VSS 3 2 1 2 2 VOUT VSS 1 2 VIN C9 U8 MCP4726 1 2 1 MCP1525 1 2 VDD HDR-2.54 Male 1x2 GND C13 1uF 10V 0603 GND MCP23008 GPIO Expander R12 IO_GP0 VDD SCL SDA VDD C20 0.1uF 16V 0603 IO_INT 1 SCL 2 SDA 3 4 5 6 8 A2 A1 A0 RESET INT 20 VDD 9 VSS GND GP0 GP1 GP2 GP3 GP4 GP5 GP6 GP7 12 13 14 15 16 17 18 19 IO_GP2 1k GREEN 0603 LD4 5% R15 J16 1k GREEN 0603 LD5 IO_GP3 IO_GP4 IO_GP5 IO_GP6 R16 5% 1k GREEN 0603 LD6 5% R18 1k GREEN 0603 LD7 R19 5% 7 NC 10 NC 11 NC DS50002480A-page 47 1k GREEN 0603 LD8 5% R20 GND 1k GREEN 0603 LD9 IO_GP7 R22 5% 1k 0603 5% GREEN 1 2 GND HDR-2.54 Male 1x2 J20 J17 IO_GP0 IO_GP1 IO_GP2 IO_GP3 IO_GP4 IO_GP5 IO_GP6 IO_GP7 1 2 3 4 5 6 7 8 MCP23008 1 2 3 4 5 6 7 8 U11 HDR-2.54 Female 1x8 HDR-2.54 Male 1x8 Schematics and Layouts IO_GP1 LD2 1k GREEN 0603 LD3 R14 5% MCP2221 I2C Demonstration Board User's Guide A.4 BOARD - TOP SILK A.5 BOARD - TOP COPPER AND SILK DS50002480A-page 48 2016 Microchip Technology Inc. Schematics and Layouts A.6 BOARD - TOP COPPER A.7 BOARD - BOTTOM COPPER 2016 Microchip Technology Inc. DS50002480A-page 49 MCP2221 I2C Demonstration Board User's Guide A.8 BOARD - BOTTOM COPPER AND SILK A.9 BOARD - BOTTOM SILK DS50002480A-page 50 2016 Microchip Technology Inc. MCP2221 I2C DEMONSTRATION BOARD USER'S GUIDE Appendix B. Bill of Materials (BOM) TABLE B-1: Qty BILL OF MATERIALS (BOM)(1) Reference Description Manufacturer Part Number 15 C1, C3, C4, C5, Cap. Ceramic, 0.1 F, 16V, 10%, X7R SMD, C6, C7, C8, C9, 0603 C11, C12, C14, C16, C18, C20, C21 AVX Corporation 0603YC104KAT2A 1 C2 Murata Electronics(R) GRM188R60J474KA01D 3 C10, C13, C19 Cap. Ceramic, 1 F, 10V, 20%, Y5V SMD, 0603 Murata Electronics GRM188F51A105ZA01D 2 C15, C17 Cap. Ceramic, 4.7 F, 10V, 10%, X5R SMD, 0603 Taiyo Yuden Co., Ltd. LMK107BJ475KA-T 1 J1 Socket IC, Push, DIP 20, TH Mill-Max Mfg. Corporation 110-99-320-41-001 4 J2, J7, J10, J13 Conn. Header-2.54, Female, 1x2, Gold, TH, Vertical Samtec, Inc. SSW-102-01-T-S 10 J3, J6, J8, J9, J11, J14, J15, J18, J20, J24 Conn. Header-2.54, Male, 1x2, Gold, 5.84 MH TH, Vertical FCI 77311-118-02LF 2 J4, J21 Conn. USB Mini-B, Female, SMD, R/A Molex(R) 0548190572 1 J5 Conn. DSUB DE-9, Female, TH, R/A Fuk Hing Industries Co., Ltd DR-9S 1 J12 Conn. Header-2.54, Male, 2x4, Tin, 5.84 MH TH, Vertical FCI 67996-408HLF 1 J16 Conn. Header-2.54, Female, 1x8, Tin, TH, Vertical Sullins Connector Solutions PPTC081LFBN-RC 1 J17 Conn. Header-2.54, Male, 1x8, Gold, 5.84 MH TH FCI 68001-108HLF 1 J19 Conn. Header-2.54, Male, 1x3, Gold, 5.84 MH TH, Vertical FCI 68000-103HLF 1 J22 Conn. USB, USB-A, Female, SMD, R/A Assmann Electronics Inc. AU-Y1006-R 1 J23 Conn. Header-2.54, Male, 1x6, Gold, 5.84 MH TH, R/A FCI 68016-106HLF 1 J25 Conn. Header-2.54, Female, 1x6, Gold, TH, R/A Sullins Connector Solutions PPPC061LGBN-RC 1 LD1 LED, RGB, 3.5x3.4 MM, 6PLCC Cree, Inc. CLX6A-FKB-CJNNRFJBB7A363 8 LD2, LD3, LD4, Diode LED, Green, 2.2V, 25 mA, 15 mcd, LD5, LD6, LD7, Clear, SMD, 0603 LD8, LD9 Kingbright Corp. APT1608SGC Note 1: Cap. Ceramic, 0.47 F, 6.3V, 10%, X5R SMD, 0603 The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components. 2016 Microchip Technology Inc. DS50002480A-page 51 MCP2221 I2C Demonstration Board User's Guide TABLE B-1: Qty BILL OF MATERIALS (BOM)(1) (CONTINUED) Reference Description 4 PAD1, PAD2, PAD3, PAD4 Mechanical HW, Rubber Pad, Cylindrical, D12.7, H3.5, Gray 1 PCB MCP2221 Printed Circuit Board 2 R1, R2 Resistor TKF, 10k, 5%, 1/10W, SMD, 0603 Panasonic(R) ERJ-3GEYJ103V 3 R3, R4, R5 Resistor TF, 10k, 1%, 1/8W, SMD, 0603 Vishay Intertechnology, Inc. MCT06030C1002FP500 1 R6 Resistor TKF, 470k, 1%, 1/10W, SMD, 0603 Vishay Intertechnology, Inc. CRCW0603470KFKEA 1 R7 Resistor TKF, 1.5k, 5%, 1/10W, SMD, 0603 Panasonic ERJ-3GEYJ152V 1 R8 Resistor TKF, 3.3k, 5%, 1/10W, SMD, 0603 Panasonic ERJ-3GSYJ332V 1 R9 Resistor TKF, 3.3k, 5%, 1/10W, SMD, 0603 Panasonic ERJ-3GSYJ272V 2 R10, R11 Resistor TKF, 4.7k, 5%, 1/10W, SMD, 0603 Yageo Corporation RC0603JR-074K7L 8 R12, R14, R15, Resistor TKF, 1k, 5%, 1/10W, SMD, 0603 R16, R18, R19, R20, R22 Panasonic ERJ-3GEYJ102V 1 R13 Resistor Trimmer Cermet, 10k, 10%, 500 m, TH, 3386F Bourns(R), Inc. 3386F-1-103TLF 1 R17 Resistor Ceramic, 0.025R, 1%, 2W, SMD, 2512 TT Electronics Plc. LRF2512-R025FW 1 R21 Resistor TKF, 20k, 5%, 1/10W, SMD, 0603 Yageo Corporation RC0603JR-0720KL 8 TP1, TP2, TP3, Misc, Test Point, Multi-Purpose, Mini, Black TP4, TP5, TP6, TP7, TP8 Keystone Electronics Corp. 5001 1 U1 In-Circuit Transceiver, MAX3232, SSOP-16 Texas Instruments MAX3232CDBR 1 U2 Microchip Analog LDO, 3.3V, MCP1825ST-3302E/DB, SOT-223-3 Microchip Technology Inc MCP1825S-3302E/DB 1 U3 Microchip Interface, USB, I2C, UART, MCP2221-I/ST, TSSOP-14 Microchip Technology Inc MCP2221-I/ST 1 U4 Microchip Memory Serial EEPROM, 128k, I2C, Microchip 24LC128-I/SN, SOIC-8 Technology Inc 24LC128T-I/SN 1 U5 Microchip Analog Temperature Sensor, -40C to +125C, MCP9808-E/MS, MSOP-8 Microchip Technology Inc MCP9808-E/MS 1 U6 Microchip Analog Current Sense Monitor, PAC1710-1-AIA-TR, DFN-10 Microchip Technology Inc PAC1710-1-AIA-TR 2 U7, U10 Microchip Analog VREF, 2.5V, MCP1525-I/TTG, Microchip SOT-23-3 Technology Inc MCP1525T-I/TT 1 U8 Microchip Analog DAC, 1-Ch, 12-Bit, MCP4726A0T-E/CH, SOT-23-6 Microchip Technology Inc MCP4726A0T-E/CH 1 U9 Microchip Analog ADC-SAR, 12-Bit, MCP3221A5T-E/OT, SOT-23-5 Microchip Technology Inc MCP3221A5T-E/OT 1 U11 Microchip Interface GPIO-Port, Expand, I2C, 8-Port, MCP23008T-E/SS, SSOP-20 Microchip Technology Inc MCP23008T-E/SS Note 1: Manufacturer 3M Part Number SJ-5012 -- 04-10437-R2 The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components. DS50002480A-page 52 2016 Microchip Technology Inc. Bill of Materials (BOM) TABLE B-2: Qty BILL OF MATERIALS (BOM) - MECHANICAL PARTS(1) Reference Description 1 CBL1, CBL2 2 JP6, JP9, JP12a, Mech. HW Jumper, 2.54 mm, 1x2, JP12b, JP14, JP18, Handle, Gold JP19, JP20, JP24 Note 1: Mech. HW Cable, USB-A Male to USB Mini-B Male, 3 ft, Black Manufacturer Part Number Katerno 10UM-02103BK TE Connectivity, Ltd. 881545-2 The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM used in manufacturing uses all RoHS-compliant components. 2016 Microchip Technology Inc. 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