MCP7381X Low-Cost Li-Ion Battery Charger Evaluation
Contents
1. MICROCHIP MCP7381X Low Cost Li Ion Battery Charger Evaluation Board User s Guide 2008 Microchip Technology DS51729A 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 copyr2. WORLDWIDE SALES AND SERVICE AMERICAS Corporate Office 2355 West Chandler Blvd Chandler AZ 85224 6199 Tel 480 792 7200 Fax 480 792 7277 Technical Support http support microchip com Web Address www microchip com Atlanta Duluth GA Tel 678 957 9614 Fax 678 957 1455 Boston Westborough MA Tel 774 760 0087 Fax 774 760 0088 Chicago Itasca IL Tel 630 285 0071 Fax 630 285 0075 Dallas Addison TX Tel 972 818 7423 Fax 972 818 2924 Detroit Farmington Hills MI Tel 248 538 2250 Fax 248 538 2260 Kokomo Kokomo IN Tel 765 864 8360 Fax 765 864 8387 Los Angeles Mission Viejo CA Tel 949 462 9523 Fax 949 462 9608 Santa Clara Santa Clara CA Tel 408 961 6444 Fax 408 961 6445 Toronto Mississauga Ontario Canada Tel 905 673 0699 Fax 905 673 6509 ASIA PACIFIC Asia Pacific Office Suites 3707 14 37th Floor Tower 6 The Gateway Harbour City Kowloon Hong Kong Tel 852 2401 1200 Fax 852 2401 3431 Australia Sydney Tel 61 2 9868 6733 Fax 61 2 9868 6755 China Beijing Tel 86 10 8528 2100 Fax 86 10 8528 2104 China Chengdu Tel 86 28 8665 5511 Fax 86 28 8665 7889 China Hong Kong SAR Tel 852 2401 1200 Fax 852 2401 3431 China Nanjing Tel 86 25 8473 2460 Fax 86 25 8473 2470 China Qingdao Tel 86 532 8502 7355 Fax 86 532 8502 7205 China Shanghai Tel 86 21 5407 5533 Fax 86 21 5407 5066 China Shenyang Tel 86 24 2334 2829 Fax
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4. HEEENEENNEEE 2008 Microchip Technology Inc DS51729A page 3 MCP7381X Li lon Battery Charger Evaluation Board User s Guide NOTES DS51729A page 4 2008 Microchip Technology Inc MCP7381X LI ION BATTERY CHARGER MICROCHIP EVALUATION BOARD USER S GUIDE Chapter 1 Product Overview 1 4 INTRODUCTION The MCP7381X Li lon Battery Charger Evaluation Board demonstrates the features and abilities for Microchip s MCP7381X Li lon Battery Charger Evaluation Board Sim ple Miniature Single Cell Fully Integrated Li lon Li Polymer Charge Management Controllers The MCP73811 2 are standalone highly integrated linear Li lon battery chargers that employ a constant current constant voltage CCCV charge algorithm for cost sensitive and space limited applications The MCP7381X Li lon Battery Charger Evaluation Board has two independent circuits that are available to evaluate an USB port powered Li lon Li Polymer battery charger and an ac dc wall adapter powered Li lon Li Polymer battery charger For an ac dc wall adapter powered battery charger an external resistor Rppog sets the magnitude of the cha
5. Evaluation Board as a development tool to emulate and debug firmware on a target board The manual layout is as follows Chapter 1 Product Overview Important information about the MCP7381X Li lon Battery Charger Evaluation Board Chapter 2 Installation and Operation Includes instructions on how to get started with this user s guide and a description of the user s guide Appendix A Schematic and Layouts Shows the schematic and layout diagrams for the MCP7381X Li lon Battery Charger Evaluation Board Appendix B Bill Of Materials BOM Lists the parts used to build the MCP7381X Li lon Battery Charger Evaluation Board 2008 Microchip Technology Inc DS51729A page 1 DS51729A page 2 CONVENTIONS USED IN THIS GUIDE MCP7381X Li lon Battery Charger Evaluation Board User s Guide This manual uses the following documentation conventions DOCUMENTATION CONVENTIONS Description Represents Examples Arial font Italic characters Referenced books MPLAB IDE User s Guide Emphasized text is the only compiler dialog Initial caps A window the Output window A dialog the Settings dialog A menu selection select Enable Programmer Quotes A field name in a window Save project before build N Rnnnn Underlined italic text with A menu path File gt Save right angle bracket Bold characters A dialog button Click OK A tab
6. of the DC power supply is not set below the charge current 4 The battery charge cycle initiates when minimum supply voltage is present The charge current can be measured by placing a current meter in series between Vpat pin on the evaluation board and positive battery terminal 5 Position the DIP Switch to USB Hi for a maximum charge rate up to 500 mA and USB Low for maximum charge rate up to 100 mA Note Remove protection film before using the DIP Switch This may be done by the manufacturer prior shipping DS51729A page 10 2008 Microchip Technology Inc Installation and Operation 6 Fast Charge Current for MCP73812 can be programmed with various resistors that based on the Figure 2 1 Rppog is represented as R1 on the evaluation board Note The battery can be replaced with test circuit or electronic load that can sink current with DC power supply 7 Pull CE pin on the evaluation board Low to disable the system or terminate the charge R1 Actual Circuit v WA TER AC DC Adapter MCP7381X Low Cost Li lon Battery Charger Evaluation Board MICROCHIP MCP7381XEV e 102 00172 FIGURE 2 2 MCP7831X Low Cost Li lon Battery Charger Evaluation Board Top Silk Layout 2008 Microchip Technology Inc DS51729A page 11 MCP7381X Li lon Battery Charger Evaluation Board User s Guide NOTES DS51729A page 12 2008 Microchip Technology Inc AN MCP7381X LI ION BATTERY CHARG
7. 1X LI ION BATTERY CHARGER MICROCHIP EVALUATION BOARD USER S GUIDE Table of Contents inire me rnc T EM 1 INTROGUGTION ER Et 1 D c me nt Lay ii ee tend 1 Conventions Used in this Guide ete pcnc E ln anc 2 Recommended Reading 2 TING Microchip WE ING iiio te Goa eter ple eoa eed Ra E Dru qud ead Eu 3 SPORT i aedes redet edere E Mi 3 Document Revision History 3 Chapter 1 Product Overview 1 1 Introductions erre Mex e RR EH RE 5 1 2 What is the MCP7381X Li lon Battery Charger Evaluation Board 7 1 3 What the MCP7381X Li lon Battery Charger Evaluation Board Kit Includes 7 Chapter 2 Installation and Operation 2 ac e t ot e bri ert E Leva PES 9 2 2 d n d ette 9 2 3 Getting Started C 10 Appendix A Schematic and Layouts Aid Introductio nna Feed see EE YET ea da Led ler 13 A 2 Board Schematic eeessssssseeeenenenenennmenenn nennen nnn nnn nnns 14 AS Board Top Lay Ol uere AR nn ete tuia piede 15 AA Board Metal Layer nine ne tre annees ten tels et 15 5 Board Bottom Layer assume ennemie Ries entes 16 Appendix B Bill Of Materials BOM Worldwide Sales and Service 11leeeeeeieeeeeeeeeeese eene nnns n nnns annua nnn 18 2008 Microchip Technology Inc DS51729A page iii MCP7381X Li lon B
8. 39 0331 742611 Fax 39 0331 466781 Netherlands Drunen Tel 31 416 690399 Fax 31 416 690340 Spain Madrid Tel 34 91 708 08 90 Fax 34 91 708 08 91 UK Wokingham Tel 44 118 921 5869 Fax 44 118 921 5820 01 02 08 DS51729A page 18 2008 Microchip Technology Inc
9. A number in verilog format where N is the total number of digits R is the radix and n is a digit Click the Power tab 4 b0010 2 hF1 Text in angle brackets gt A key on the keyboard Press Enter F1 Courier New font Plain Courier New Sample source code define START Filenames autoexec bat File paths c mcec18 h Keywords _asm _endasm static Command line options Opa Opa Bit values 0 1 Constants OxFF A Italic Courier New A variable argument file o Where file can be any valid filename Square brackets Optional arguments mcci8 options file options Curly brackets and pipe character Choice of mutually exclusive arguments an OR selection errorlevel 011 Ellipses Replaces repeated text var name var name Represents code supplied by user void main void RECOMMENDED READING This user s guide describes how to use MCP7381X Li lon Battery Charger Evaluation Board The following Microchip documents are available and recommended as supplemental reference resources MCP73811 2 Data Sheet Simple Miniature Single Cell Fully Integrated Li lon Li Polymer Charge Management Controllers DS22036 This data sheet provides detailed information regarding the MCP73811 2 product family 2008 Microchip Technology Inc Preface THE MICROCHIP WEB SITE
10. ER MICROCHIP EVALUATION BOARD USER S GUIDE Appendix A Schematic and Layouts A 1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP7381X Low Cost Li lon Battery Charger Evaluation Board Board Schematic Board Top Layer Board Top Metal Layer Board Bottom Layer 2008 Microchip Technology Inc DS51729A page 13 MCP7381X Li lon Battery Charger Evaluation Board User s Guide BOARD SCHEMATIC A 2 30 12945 UMDIQ H9S 13 24100 0 L00c 0c 8 nyo a eeuibu3 dIHIOXIIW 4100 9014 T P4DOg D 3 XI8 dONW ou pees ubiseg ubisag SO ON UOISIAOY Loot 81 L a V c T ET 3 c9 zl a amp lt B 5 AZ NN Ld zaon c D se O E m x I gut lt gt dl za N LOGA gs zn cu SE Rs 100A 8 V 2008 Microchip Technology Inc DS51729A page 14 Schematic and Layouts A 3 BOARD TOP LAYER R2 R1 Actual Circuit AC DC Adapter MCP7381X Low Cost Li lon Battery Charger Evaluation Board MICROCHIP MCP7381 XEV e 102 00172 4 BOARD METAL LAYER 2008 Microchip Technolog
11. IGURE 1 3 Typical MCP73811 Applications DS51729A page 6 2008 Microchip Technology Inc Product Overview 1 2 WHAT IS THE MCP7381X LI ION BATTERY CHARGER EVALUATION BOARD The MCP7381X Li lon Battery Charger Evaluation Board demonstrates the use of the MCP73811 2 Simple Miniature Single Cell Fully Integrated Li lon Li Polymer Charger Management Controllers The MCP7381X Li lon Battery Charger Evaluation Board is setup to evaluate low cost single cell Li lon Li Polymer battery chargers This board utilizes Microchip s MCP7381X Li lon Battery Charger Evaluation Board that efficiently charge Li lon Li Polymer batteries with a preset 196 voltage accuracy regulation at 4 2V The MCP7381X Li lon Battery Charger Evaluation Board comes with two pre installed cir cuits An ac dc adapter powered Li lon Li Polymer battery charger and an USB port powered Li lon Li Polymer battery charger The MCP73811 is available for the USB port powered circuit while the MCP73812 is designed for the ac dc wall adapter powered circuit A SOT 23 5 MCP73811 is pre installed on the evaluation board with a mechanical dip switch which selects charge current High 450 mA or Low 85 mA for the USB port powered battery charger system A SOT23 5 MCP73812 is pre installed on the evaluation board with a pro gramming resistor Rppog which delivers 500 mA from the ac dc wall adapter source When the Chip Enable CE pin is in High condition that particular ci
12. 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 support microchip com DOCUMENT REVISION HISTORY Revision A April 2008 nitial Release of this Document
13. attery Charger Evaluation Board User s Guide NOTES DS51729A page iv 2008 Microchip Technology Inc MCP7381X LI ION BATTERY CHARGER MICROCHIP EVALUATION BOARD USER S GUIDE Preface NOTICE TO CUSTOMERS 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 DSXXXXXA where XXXXX 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 IDE on line help Select the Help menu and then Topics to open a list of available on line help files INTRODUCTION This chapter contains general information that will be useful to know before using the MCP7381X Li lon Battery Charger Evaluation 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 MCP7381X Li lon Battery Charger
14. ighted 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 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 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV ISO TS 16949 2002 Trademarks The Microchip name and logo the Microchip logo Accuron dsPIC KEELOQ logo MPLAB PIC PICSTART PRO MATE rfPIC and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U S A and other countries FilterLab Linear Active Thermistor MXDEV MXLAB SEEVAL SmartSensor and The Embedded Control Solutions Compa
15. ing the proper connections Red for Vpp and Black for GND amp VBar White for CE Chip Enable 2 position Dip Switch for charge current selections between USB Low and USB High Chip Enable CE Pin to disable the system when drive Low Evaluating different charge current rates by changing Rppog Programming Resistor values See Figure 2 1 2008 Microchip Technology Inc DS51729A page 9 MCP7381X Li lon Battery Charger Evaluation Board User s Guide 550 500 450 400 350 300 250 200 150 100 50 Charge Current mA 2 4 6 8 10 12 14 16 18 20 Programming Resistor FIGURE 2 1 Charge Current lour vs Programming Resistor 2 3 GETTING STARTED The MCP7381X Low Cost Li lon Battery Charger Evaluation Board is fully assembled and tested for charging single cell Li lon Li Polymer batteries with a regulated 5V DC source or USB port 2 3 1 Power Input and Output Connection 2 311 POWERING THE MCP7381X LOW COST LI ION BATTERY CHARGER EVALUATION BOARD 1 Connect the negative battery terminal to Vgar pin on the evaluation board and positive battery terminal to VBar pin on the evaluation board 2 Connect 5V DC power supply negative terminal to GND pin on the evaluation board 3 Connect 5V DC power supply positive terminal to Vpp pin on the evaluation board Slowly increase the supply voltage to 5V Note Make sure the current limit
16. ny are registered trademarks of Microchip Technology Incorporated in the U S A Analog for the Digital Age Application Maestro CodeGuard dsPICDEM dsPICDEM net dsPICworks dsSPEAK ECAN ECONOMONITOR FanSense In Circuit Serial Programming ICSP ICEPIC Mindi MiWi MPASM MPLAB Certified logo MPLIB MPLINK mTouch PICkit PICDEM PICDEM net PICtail PIC3 logo PowerCal Powerlnfo PowerMate PowerTool REAL ICE rfLAB Select Mode Total Endurance UNI O WiperLock 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 All other trademarks mentioned herein are property of their respective companies 2008 Microchip Technology Incorporated Printed in the U S A All Rights Reserved I Printed on recycled paper Microchip received ISO TS 16949 2002 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 009 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 DS51729A page ii 2008 Microchip Technology Inc MCP738
17. ochip Technology Inc MCP7381X LI ION BATTERY CHARGER MICROCHIP EVALUATION BOARD USER S GUIDE Chapter 2 Installation and Operation 2 1 INTRODUCTION The MCP7381X Low Cost Li lon Battery Charger Evaluation Board demonstrates Microchip s Simple Miniature Single Cell Fully Integrated Li lon Li Polymer Charge Management Controllers MCP73811 and MCP73812 The MCP73811 is powered from USB port to charge Li lon Li Polymer batteries The charge current is logic selectable between High 500 mA and Low 100 mA The MCP73812 is designed to charge Li lon Li Polymer batteries with programmable charging current up to 500 mA by a single resistor from a regulated 5V ac dc wall adapter The MCP73811 2 require only minimum components to implement a completed circuit of Li lon Li Polymer battery charge management in any systems The development of MCP73811 2 meets the challenges of today s cost sensitive and space limited applica tions The MCP7381X Low Cost Li lon Battery Charger Evaluation Board comes with a pre installed 5 Lead SOT 23 MCP73811 and a pre installed 5 Lead SOT 23 MCP73812 Typical applications for MCP73811 2 are Rechargeable Toys Low Cost Lithium lon Lithium Polymer Battery Chargers Electronic Cigarettes Rechargeable Portable Electronic Devices Bluetooth Headsets or USB Chargers 2 2 FEATURES The MCP7381X Low Cost Li lon Battery Charger Evaluation Board has the following features Color coded test points ensur
18. rcuit is ready to charge single cell Li lon batteries Note The systems are designed in operation mode with CE pin High and can be disabled when driving CE pin Low The two dashed silk screen areas on the evaluation board show the required circuit size for the printed circuit board PCB layout and provide system product designers a visual aid prior design the system The MCP7381X Li lon Battery Charger Evaluation Board is designed to observe the performance and features via multiple test points that are available on the circuits Users are able to discover the compact size of the layout in addition to the device itself The circuit can also be implemented into suitable applications without any additional works 1 3 WHAT THE MCP7381X LI ION BATTERY CHARGER EVALUATION BOARD KIT INCLUDES The MCP7381X Li lon Battery Charger Evaluation Board kit includes MCP7381X Li lon Battery Charger Evaluation Board 102 00172 Pre installed 5 Lead SOT 23 MCP73811 5 Lead SOT 23 MCP73812 and required components Analog and Interface Products Demonstration Boards CD ROM DS21912 MCP7381X Li lon Battery Charger Evaluation Board User s Guide DS51729 MCP73811 2 Data Sheet Simple Miniature Single Cell Fully Integrated Li lon Li Polymer Charge Management Controllers DS22036 2008 Microchip Technology Inc DS51729A page 7 MCP7381X Li lon Battery Charger Evaluation Board User s Guide NOTES DS51729A page 8 2008 Micr
19. rge current up to 500 mA When the USB port provides power to the battery charger the MCP73811 specifically adheres to the current limits governed by the USB specification The PROG pin selects two preset charge current rates of typical 85 mA Low or 450 mA High and does not exceed 100 mA Low or 500 mA High maximum charge current As for USB regulation a device may draw either low power at one unit load or high power at 5 unit loads A unit load is defined to be 100 mA The drawn current per unit load is an absolute maximum value not an average over time This chapter covers the following topics What is the MCP7381X Li lon Battery Charger Evaluation Board What the MCP7381X Li lon Battery Charger Evaluation Board Kit includes Li lon Battery Charger REGULATED WALL CUBE MCP73812 FIGURE 1 1 MCP73812 Typical Application 2008 Microchip Technology Inc DS51729A page 5 MCP7381X Li lon Battery Charger Evaluation Board User s Guide 5 0 500 S 4 0 q A 400 E 3 0 c 300 2 gt 5 gt 2 0 200 p d 1 0 100 S Von O 2 0 0 0 1 O 1 O O O OFT OR D 10 O o r Time Minutes FIGURE 1 2 Typical MCP73812 Charge Profile 950 mAh Li lon Battery Pack 500 mA Li lon Battery Charger Single Li lon Cell MCP73811 F
20. y Inc DS51729A page 15 MCP7381X Li lon Battery Charger Evaluation Board User s Guide A 5 BOARD BOTTOM LAYER SNTGS hGT DS51729A page 16 2008 Microchip Technology Inc MCP7381X LI ION BATTERY CHARGER MICROCHIP EVALUATION BOARD USER S GUIDE Appendix B Bill Of Materials BOM TABLE 1 BILL OF MATERIALS BOM QTY Reference Description Manufacture MFG PART 4 C1 C2 C4 CAP CERAMIC 2 2 uF 10V X5R 0603 Taiyo Yuden LMK107BJ225KA T SMD R1 RES 2K OHM 1 10W 1 0603 SMD Yageo Corp RCO603FR 072KL 2 R2 R3 RES 100K OHM 1 10W 196 0603 Panasonic ECG ERJ 3EKF1003V SMD 1 SW1 SWITCH SLIDE SPDT SMD J LEAD ELECTRONICS CJS 1200TA INC 4 Bump BUMPON HEMISPHERE 44X 20 3M J5003 9 ND WHITE 1 U1 Simple Miniature Single Cell Fully Microchip Technology Inc MCP73812T 4201 0T Integrated Li lon Li Polymer Charge Management controllers Programma ble Charge Current 1 U2 Simple Miniature Single Cell Fully Microchip Technology Inc MCP73811T 420l OT Integrated Li lon Li Polymer Charge Management controllers Selectable Charge Current 1 PCB Printed Circuit Board 104 00172 R1 Note 1 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 2008 Microchip Technology Inc DS51729A page 17 MICROCHIP
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