MCP73871 Demo Board with Voltage Proportional
Contents
1. 4 SEL Hi Low 43 RPROG1 10KO FIGURE 1 1 MCP73871 With System Power Path and Voltage Proportional Current Control VPCC Management Typical Application HF 110 KQ PROG1 JAM z AR U az O Q N Low Lowi TE PROG3 Low Hi 2009 Microchip Technology Inc DS51812B page 9 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide 1 2 WHAT IS THE MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL CURRENT CONTROL The MCP73871 Demo Board with Voltage Proportional Current Control demonstrates the features of Microchip s MCP73871 Stand Alone System Load Sharing and Li lon Li Poly Battery Charge Management Controller The MCP73871 Demo Board with Voltage Proportional Current Control is designed to deliver minimum 1 5A total current to system load and to a single cell Li lon battery at 4 2V preset voltage regulation 4 1V 4 35V and 4 4V options are also available for MCP73871 The MCP73871 Demo Board with Voltage Proportional Current Control has one dip switch S1 with four poles to control input current limits enable charge timer and enable charging The first switch decides the input power source between AC DC wall adapter and USB port AC USB The second switch of S1 determines the 500 mA high power USB port or the 100 mA low power USB port High Low if the first switch of S1 is enabled ON The input current limit is governed b2. MICROCHIP MCP73871 Demo Board with Voltage Proportional Current Control User s Guide HEEENENNEEE R 2009 Microchip Technology Inc Note the following details of the code protection feature on Microchip devices Microchip products meet the specification contained in their particular Microchip Data Sheet Microchip believes that its family of products is one of the most secure families of its kind on the market today when used in the intended manner and under normal conditions There are dishonest and possibly illegal methods used to breach the code protection feature All of these methods to our knowledge require using the Microchip products in a manner outside the operating specifications contained in Microchip s Data Sheets Most likely the person doing so is engaged in theft of intellectual property Microchip is willing to work with the customer who is concerned about the integrity of their code Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code Code protection does not mean that we are guaranteeing the product as unbreakable Code protection is constantly evolving We at Microchip
3. INTRODUCTION This chapter contains general information that will be useful to know before using the MCP73871 Demo Board with Voltage Proportional Current Control 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 MCP73871 Demo Board with Voltage Proportional Current Control as a linear Li lon battery charge controller that can share a load The manual layout is as follows Chapter 1 Product Overview Important information about the MCP73871 Demo Board with Voltage Proportional Current Control 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 MCP73871 Demo Board with Voltage Proportional Current Control Appendix B Bill of Materials BOM Lists the parts used to build the MCP73871 Demo Board with Voltage Proportional Current Control 2009 Microchip Technology Inc DS51812B page 5 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions DOCUMENTATION CONVENTIONS Description Repr
4. Top Silk and Pads ion a e a a Hee 15 A 4 Board Top Metal Layer 355 e ob es ax et tie fet tiadedt 16 AS Board Bottom Layer aor beoe ee cb te E gno Ea ipa etat edad 17 Appendix B Bill of Materials BOM Worldwide Sales and Service 0 ecco ie er L eee Ce creux cune cre roa e arena ua K AKANA KAKAA Kaa 20 2009 Microchip Technology Inc DS51812B page 3 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide NOTES DS51812B page 4 2009 Microchip Technology Inc MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL MICROCHIP CURRENT CONTROL 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 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
5. VBAT R5 u R R3 Emulation E B El TP5 Circuit LED3 LED2 LED Im PG STAT2 STAT1 LB FIGURE 2 3 MCP73871 Top Board and Application Circuit TABLE 2 1 MCP73871 CHARGE STATUS OUTPUTS Charge Cycle State STAT1 Green STAT2 Red PG Blue Shutdown OFF OFF OFF Standby OFF OFF ON Charge in Progress ON OFF ON Charge Complete EOC OFF ON ON Temperature Fault ON ON ON Timer Fault ON ON ON Low Battery Indicator LBO ON OFF OFF No Battery Present OFF OFF ON No Input Power OFF OFF OFF Note LED Status Outputs are given for the battery connected at Vga and GND TABLE 2 2 MCP73871 DEMO BOARD DIP SWITCH CONFIGURATION State Function Switch Name Observations OFF ON 1 SEL AC DC Adapter Power from USB 2 PROG2 USB maximum 500 mA USB max 100 mA Only if SEL is ON 3 TE Timer Enable OFF Timer Enable activated Factory preset at 4h 6h and 8h 4 CE Charge is enabled Charge function OFF CE Chip Enable DS51812B page 14 2009 Microchip Technology Inc Installation and Operation 2 3 3 Voltage Proportional Charge Control VPCC Function If the input voltage drops to a preset value determined by the threshold established at the VPCC input 1 23V at pin 2 due to a limited amount of input current or input source impedance the battery charging current is reduced The VPCC control tries to reach a steady state condition where the system load has priority and the battery is
6. Board with Voltage Proportional Current Control Other useful documents are listed below The following Microchip documents are available and recommended as supplemental reference resources e MCP73871 Data Sheet Stand Alone System Load Sharing and Li lon Li Polymer Battery Charge Management Controller DS22090 This data sheet provides detailed information regarding the MCP73871 product family 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 Techn
7. IY gir lea oi F Yy SE yan y a ly S vu9L I001 VWAOL lt OL c9 ds N N 3jue4Jn uonpuiuue ebubu ZY TH mes HOLL gt 904d w w y ve SY La yat zi i908d ogv uvis g T 18A ZIVIS ia vl T 8SOHvOVOS 1V8A 3 1 1Y8A 9d m FT o iS lolo lo WaA Wa3HL 33 d 9y l JOjSIUJSu 3T Em zooa E 3 m 39 z908d 7 zooa D eopjd pup gurasoa XOLL OLE XOLL MOLL NI ms dl 9dl Ld 9dL 8i TTF ZLA LLN OLY 63 Ae zn NI Ida z Gan az ino 1no i an Ole OZNJO 1Z48 4d2W gy Jn v 19 jn v 9 Zdl E dL ie GGA ino Gana aaa NO 440 jjO quasaig Wapi ON 440 440 NO puj fiejbg MoT NO NO NO noy Jou dwa NO NO 440 ajajdwo9 abspyo NO 440 NO Buibsoy 330 430 430 4amod 3ndu ON 440 440 440 umopynys anja od pey Z1VLS uaa19 LIWLS snojs puoog 21 6 80 ubiseq jonuul d AHT s ndyno snjejs e321euj5 1LeELdON add uondus seqg Ady a 9 g V MCP73871 Demo Board with Voltage Proportional Current Control User s Guide A 2 DS51812B page 18 Schematic and Layouts A 3 BOARD TOP SILK AND PADS MCP73871DM 102 00244 Voltage Proportional Current Control T2 MICROCHIP TP6 LED3 LED2 LED PG STAT2 STAT1 LB o OQ 2009 Microchip Technology Inc DS51812B page 19 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide A4 BOARD TOP METAL LAYER DS51812B page 20 2009 Microchip Technology Inc S
8. 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 QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV ISO TS 16949 2002 Trademarks The Microchip name and logo the Microchip logo dsPIC KEELOQ KEELOQ logo MPLAB PIC PICmicro PICSTART r
9. charged with the remaining current Therefore if the system demands more current that the input can provide the MCP73871 changes its status and the battery is able to supplement the input current to the system load The VPCC function sustains the system load as its highest priority It does this by reducing the noncritical charge current while maintaining the maximum power output of the adapter Further demand from the system is supported by the battery if possible The VPCC feature functions are identical for USB port or AC DC adapter inputs This feature can be disabled by removing resistor R7 and replacing Rg with a zero ohms 0603 resistor The demo board is designed to operate with 5 5V with 0 5V tolerance input voltage by setting accordingly the voltage on VPCC pin by R7 and R8 resistors see A 2 Board Schematic Additional information on the configuration of the VPCC function is available in the MCP73871 Data Sheet 2 3 3 1 EXAMPLE A system is designed with a 5 0V rated DC power supply with 0 5V tolerance The worst condition of 4 5V is selected which is used to calculate the VPCC supply voltage with divider The voltage divider equation is shown below R7 VPCC gZ Rg DDmin 110k R8 292 43kQ The calculated Rg equals to 292 43 kQ when 110 kQ is selected for R7 The 294 kQ resistor is selected for Rg to build the voltage divider for VPCC pin Figure 2 4 illustrates the influence of various input v
10. manufacturer typical at 1C or less or 1A for safety and performance concerns 6 You should initiate the battery charging cycle when turning CE switch of S1 OFF Turning the CE switch ON disables the Li lon battery charger function 7 The S1 switch 1 in OFF position SEL AC DC allows maximum input current of 1 8A to support both system load and Li lon battery charger at 1000 mA fast charge current rate 8 The S1 switch 1 in ON position SEL USB limits the input current to meet USB specifications 9 If switch SEL is in ON position PROG2 the user has two options for switch 2 OFF limits the total input current to 500 mA ON for maximum input current at 100 mA Note 1 For setup configuration follow the information in Table 2 2 2 Fast Charge Current and Termination Current can be easily programmed with various resistors based on Figure 2 1 3 TheLi lon battery pack can be replaced with test circuit or electronic load that can sink current with DC power supply Refer to Figure 2 2 for details 10 If DC power is removed the load should be supported by the Li lon battery 2 3 2 Programming Resistors The resistors that connected at RpgocG4 and Rprogs pins select the maximum charge current in constant current mode from ac dc adapter and termination current respectively The relationship between fast charge current and value of Rpgoc1 resistor is illustrated in Figure 2 1 The correspondence of R
11. 1 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 86 24 2334 2393 China Shenzhen Tel 86 755 8203 2660 Fax 86 755 8203 1760 China Wuhan Tel 86 27 5980 5300 Fax 86 27 5980 5118 China Xiamen Tel 86 592 2388138 Fax 86 592 2388130 China Xian Tel 86 29 8833 7252 Fax 86 29 8833 7256 China Zhuhai Tel 86 756 3210040 Fax 86 756 3210049 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 Fax 91 80 3090 4080 India New Delhi Tel 91 11 4160 8631 Fax 91 11 4160 8632 India Pune Tel 91 20 2566 1512 Fax 91 20 2566 1513 Japan Yokohama Tel 81 45 471 6166 Fax 81 45 471 6122 Korea Daegu Tel 82 53 744 4301 Fax 82 53 744 4302 Korea Seoul Tel 82 2 554 7200 Fax 82 2 558 5932 or 82 2 558 5934 Malaysia Kuala Lumpur Tel 60 3 6201 9857 Fax 60 3 6201 9859 Malaysia Penang Tel 60 4 227 8870 Fax 60 4 227 4068 Philippines Manila Tel 63 2 634 9065 Fax 63 2 634 9069 Singapore Tel 65 6334 8870 Fax 65 6334 8850 Taiwan Hsin Chu Tel 886 3 657
12. 1 Charge Profile in Constant Voltage Mode for a 900 mAh Li lon Cell DS51812B page 16 2009 Microchip Technology Inc MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL MICROCHIP CURRENT CONTROL USER S GUIDE Appendix A Schematic and Layouts A 1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP73871 Demo Board with Voltage Proportional Current Control Board Schematic Board Top Silk and Pads Board Top Metal Layer Board Bottom Layer 2009 Microchip Technology Inc DS51812B page 17 BOARD SCHEMATIC 2009 Microchip Technology Inc a 9 g Y l 40 Jasusi HOS L8N v00 0 auuduUa 5 jub3suo2 A Kq UMD 91 6 8002 9100 unuisuoo amp Suj diH2OHOJIIA Aiddns 3ue un2 440 veas NO vwal ASN zooud g iddns 1eog 440 43 d0PY Od Ov NO 8SN 73S L NV e qpu3 diu 35 wey rd vvc00 e0F ezis 9Iqou3 awil 31 Y NOILVMR9IJNOO 7 dNLIS IId NWA L LEELA yp youms did SSA SSA 2 aan dan tdl SdL N3349 034 ama vUJ9Q L 401 vu99gL L OgV uvis Zivis ad abuby9 S04 4e dDpy 30 2v ek 9 1504 Jeydopy OG Ov
13. 8 300 Fax 886 3 6578 370 Taiwan Kaohsiung Tel 886 7 536 4818 Fax 886 7 536 4803 Taiwan Taipei Tel 886 2 2500 6610 Fax 886 2 2508 0102 Thailand Bangkok Tel 66 2 694 1351 Fax 66 2 694 1350 EUROPE Austria Wels Tel 43 7242 2244 39 Fax 43 7242 2244 393 Denmark Copenhagen Tel 45 4450 2828 Fax 45 4485 2829 France Paris Tel 33 1 69 53 63 20 Fax 33 1 69 30 90 79 Germany Munich Tel 49 89 627 144 0 Fax 49 89 627 144 44 Italy Milan Tel 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 03 26 09 DS51812B page 24 2009 Microchip Technology Inc
14. NAL MICROCHIP CURRENT CONTROL USER S GUIDE Chapter 2 Installation and Operation 2 1 INTRODUCTION The MCP73871 Demo Board with Voltage Proportional Current Control demonstrates Microchip s standalone linear Li lon battery charger with system power path and load sharing management control solution The system load is also powered by the Li lon battery when the input power is disconnected A number of device options allow the MCP73871 to be utilized in a variety of applications Please refer to the MCP73871 Data Sheet DS22090 and or contact local Microchip supports for additional device options Typical applications for the reference design are in Smart Phones PDA Portable Media Players MP3 Players Digital Cameras Handheld Medical devices Bluetooth headsets Ultra Mobile PC and Portable Communicators 2 2 FEATURES The MCP73871 Demo Board with Voltage Proportional Current Control has the following features Integrated System Load Sharing Voltage Proportional Current Control VPCC Input voltage 5 5V with 0 5V tolerance additional information available in the MCP73871 Data Sheet Input Current Limit Control hardware selected typical 1650 mA USB High maximum 500 mA and USB Low maximum 100 mA Three LEDs to indicate charge status low battery and power good signal Preset Li lon battery charge voltage 4 2V 0 5 Temperature monitoring is disabled by default but can be enabled to use with a NTC thermister tied at
15. TP6 and TP7 and removing R6 Factory preset 0 1C preconditioning current of deeply depleted cells Factory preset Safety Timer with Timer Enable feature by S1 switch Constant Current Constant Voltage CC CV charge algorithm Resistor programmed maximum charge current Rppogg 1A Resistor programmed termination set point Rpgogc3 100 mA Automatic Charge Termination Automatic Recharge Internal Thermal Regulation Exposed Pad with extra via underneath for better heat dissipations 2009 Microchip Technology Inc DS51812B page 11 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide 2 3 GETTING STARTED The MCP73871 Demo Board with Voltage Proportional Current Control is fully assembled and tested for charging a single cell Li lon or Li Polymer battery with or without system load 2 3 1 Power Input and Output Connection 2 3 1 1 POWERING THE MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL CURRENT CONTROL 1 Connect the positive battery terminal to Vgar TP4 and negative battery terminal to GND TP1 or TP5 2 Connect the 5V 6V DC power supply Negative Terminal to GND TP1 or TP5 3 Connect the 5V 6V DC power supply Positive Terminal to Vpp TP2 4 Connect positive of load to OUT TP3 on the board and negative of load to GND TP1 or TP5 The system load can be a power resistor or E Load 5 The maximum current that system load requires should not violate the specification of Li lon battery
16. chematic and Layouts A 5 BOARD BOTTOM LAYER CA AALOO AOT 2009 Microchip Technology Inc DS51812B page 21 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide NOTES DS51812B page 22 2009 Microchip Technology Inc MICROCHIP MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL CURRENT CONTROL USER S GUIDE Appendix B Bill of Materials BOM TABLE B 1 BILL OF MATERIALS BOM Qty Reference Description Manufacturer Part Number 3 C1 C2 C3 CAP CERAMIC 4 7 uF 10 X5R 0603 Taiyo Yuden LMK107BJ475KA T 1 LED1 True Green Water Clear 0603 SMD Para Light USA L C191LGCT U1 LED 1 LED2 Super Red Water Clear 0603 SMD Para Light USA L C191KRCT U1 LED 1 LED3 Blue Water Clear 0603 SMD LED Para Light USA L C191LBCT U1 1 PCB RoHS Compliant Bare PCB Advanced Circuits 104 00244 MCP73871 Demo Board w Voltage Proportional Current Control 4 R1 R3 R4 R5 RES 1K OHM 1 10W 1 0603 SMD Panasonic ECG ERJ 3EKF1001V 2 R2 R6 RES 10K OHM 1 10W 196 0603 SMD Panasonic ECG ERJ 3EKF 1002V 5 R7 R9 R10 RES 110K OHM 1 10W 1 0603 Panasonic ECG ERJ 3EKF 1103V R11 R12 SMD 1 R8 RES 330K OHM 1 10W 5 0603 Panasonic ECG ERJ 3GEYJ334V SMD 1 S1 SWITCH DIP TAPE SEALED 4POS C amp K Components SDAO4HOSB SMD 5 TP1 TP2 TP3 PC Test Point Compact SMT Keystone 5016 TP4 TP5 Electronics 1 U1 Stand Alone System Load Sha
17. esents Examples Arial font Italic characters Referenced books MPLAB IDE User s Guide Emphasized text is the only compiler 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 or Save project before build dialog Underlined italic text with A menu path File Save right angle bracket Bold characters A dialog button Click OK A tab Click the Power tab N Rnnnn A number in verilog format 4 b0010 2 hF1 where N is the total number of digits R is the radix and nisa digit 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 Mncc18 Nh 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 mcc18 options file options Curly brackets and pipe Choice of mutually exclusive errorlevel 011 character arguments an OR selection Ellipses Replaces repeated text var_name var_name Represents code supplied by void main void user DS51812B page 6 2009 Microchip Technology Inc Preface RECOMMENDED READING This user s guide describes how to use MCP73871 Demo
18. fPIC and UNI O are registered trademarks of Microchip Technology Incorporated in the U S A and other countries FilterLab Hampshire HI TECH C Linear Active Thermistor MXDEV MXLAB SEEVAL and The Embedded Control Solutions Company 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 HI TIDE In Circuit Serial Programming ICSP Mindi MiWi MPASM MPLAB Certified logo MPLIB MPLINK mTouch Octopus Omniscient Code Generation PICC PICC 18 PICDEM PICDEM net PICkit PICtail PIC32 logo REAL ICE rfLAB Select Mode Total Endurance TSHARC UniWinDriver 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 2009 Microchip Technology Incorporated Printed in the U S A All Rights Reserved LI 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 KEELOQ code hopping devices Seria
19. ical 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 2009 Microchip Technology Inc DS51812B page 7 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide DOCUMENT REVISION HISTORY Revision B November 2009 Initial Release of this Document Updated Section 2 2 Features with information on the Voltage Proportional Current Control Input Voltage Added footnote to Table 2 1 Updated Section 2 3 3 Voltage Proportional Charge Control VPCC Function Added Section 2 3 3 1 Example Revision A April 2009 nitial Release of this Document HEEEENNNEEEE Nn DS51812B page 8 2009 Microchip Technology Inc MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL MICROCHIP CURRENT CONTROL USER S GUIDE Chapter 1 Product Overview 1 1 INTRODUCTION The MCP73871 Demo Board with Vo
20. l 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 DS51812B page 2 2009 Microchip Technology Inc MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL CURRENT MICROCHIP CONTROL USER S GUIDE Table of Contents dris e 1 IMtFOGD UCTION ess 1 Document hayo e T E 1 Conventions Used in this Guide eesesssssesssssssssseseseeereee enne 2 Recommended Reading i eio edente ce IS ta d eae d eta ese be 3 The Microchip Web Site seserian MA Ia 3 Customer SUP POM seeds Auceiedsicecectecedaccuicarsieacctandecttacchaesseinceedaaccibavachatecessacateaectes 3 Document Revision History 2 esee eterne nennen nne nnns acer dokn 3 Chapter 1 Product Overview 1 1 Introduction icio e ee tack Eod esa Eau WA 5 1 2 What is the MCP73871 Demo Board with Voltage Proportional Current Control iis AWA AA AAA MAA ULIWA MAKKA WA TA EK HUA 6 1 3 What the MCP73871 Demo Board with Voltage Proportional Current Control kit rre Io TE 6 Chapter 2 Installation and Operation ZA Introduction rt Pe RR ERR ERROR RT SERA nA kaaa 7 2 2 SEMI ICT E EE A EA E EEA lain 7 2 9 G ellitig SIarted EE t AA AAA 8 Appendix A Schematic and Layouts AT Introd ctlon ki t ertet re he Re P LEE E TERRE Te Ted 13 A 2 Board e ELAN LO E E memes 14 A 3 Board
21. ltage Proportional Current Control is designed to demonstrate Microchip s stand alone linear Li lon battery charger with system power path and load sharing management control solution The MCP73871 integrates the required elements to meet design challenges when developing new Li lon Li Polymer batteries powered products The MCP73871 requires minimum external components to power the system load and charge single cell Li lon batteries independently When input power is absent or insufficient the Li lon battery becomes the primary power source and supports the required system load current The MCP73871 Demo Board with Voltage Proportional Current Control feature added is developed to assist engineers in reducing product design cycle and time by utilizing Microchip s favorite stand alone Li lon battery charger and system load sharing management controller This chapter provides an overview of the MCP73871 Demo Board with Voltage Proportional Current Control and covers the following topics What is the MCP73871 Demo Board with Voltage Proportional Current Control What the MCP73871 Demo Board with Voltage Proportional Current Control Kit includes AC DC Adapter MCP73871 or USB Port 18 19 1 20 Oo e e IN OUT e System Load 10 pF A 4700 6 4 7 uF PG V 14 15 16 FF 4700 7 SAT STAT2 VBAT SENSE 4 7 uF 330 KQ com p A 8 STAT1 5 LBO THERM TC 2 Single Cell e VPCC Li lon 3 Battery FaE
22. oltages 4 5 0 9 m 0 8 ey 3 5 07 Be 3 0 6 G o 9 2 5 0 5 E gt 2 0 46 6515 0 3 5 S 2 1 0 2 gt 0 5 0 1 0 ry 0 3 5 4 4 5 5 5 5 Input Voltage V FIGURE 2 4 Input and Output Parameters when Input Voltage is Variable from 2 5V to 5 5V See the Influence of VPCC Pin 2009 Microchip Technology Inc DS51812B page 15 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide 2 3 4 Temperature Monitoring Option The MCP73871 device monitors continuously the battery temperature during a charge cycle by measuring the voltage between the THERM and Vss pins An internal current source provides the bias for most common 10 KQ negative temperature coefficient thermistors NTC The MCP73871 device compares the voltage at the THERM pin to factory set thresholds of 1 24V and 0 25V typically Once a voltage outside the thresholds is detected during a charge cycle the MCP73871 device immediately suspends the charge cycle by turning off the charge and holding the timer value The charge cycle resumes when the voltage at the THERM pin returns to the normal range To activate this feature remove R6 resistor and connect a 10 kQ NTC thermistor to TP6 and TP7 test points 5 2 SI 4 lt o 55 S Ss E o o 2 gt so o XE z z oo 1 O O 0 0 25 50 75 100 125 150 Time min FIGURE 2 5 MCP7387
23. pgoc4 on MCP73871 Demo Board with Voltage Proportional Current Control is R4 The default value is 1 kQ which sets the maximum charge current at 1A For Rpnogs the correspondent resistor is R2 A 10 KQ resistor sets the charge termination current at 100 mA and a 100 kO value results a 10 mA termination point Read carefully the additional information on the schematic in A 2 Board Sche matic The boards comes with R2 210 kQ DS51812B page 12 2009 Microchip Technology Inc Installation and Operation 1000 _ 900 800 700 3 600 amp 500 2 400 D 300 lt 200 100 1 3 5 7 9 11 13 15 17 19 Programming Resistor kQ FIGURE 2 1 MCP73871 Charge Current Ioy7 vs Programming Resistor Rprogi ov 5V H Amp VaBar Power Meter l Microchip Source R a Battery Volt sQ Ll Charge Meter 10W 100 uF Management Controller GND VBAT FIGURE 2 2 Simulated Battery Load 2009 Microchip Technology Inc DS51812B page 13 MCP73871 Demo Board with Voltage Proportional Current Control User s Guide MCP73871DM P 102 00244 Voltage Proportional Current Control E MICROCHIP i m 5V DC OUT Resistive Load Power Supply um on min 2A C1 T E Load R1 Battery or R2 Jg na
24. ring Microchip MCP73871 2CCI ML and Li lon Li Polymer Battery Technology Inc Charge Management Controller 4 Bump BUMPON HEMISPHERE 44X 20 3M J5003 9 ND WHITE 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 2009 Microchip Technology Inc DS51812B page 23 MICROCHIP 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 Cleveland Independence OH Tel 216 447 0464 Fax 216 447 0643 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 343
25. y the USB specification when selecting USB on S1 switch The maximum fast current when AC is selected on S1 is programmed by the resistor Rproci at 1A and the termination current is set at 100 mA by Rprog3 see Figure 1 1 The MCP73871 Demo Board with Voltage Proportional Current Control offers three status LED for charge status outputs and a power good indicator Note Refer to Table 2 1 for charge status outputs and Figure 2 1 for charge current setups The MCP73871 Demo Board with Voltage Proportional Current Control comes with a factory preset low battery indicator LBO when input is absent The preset value is 3 2V and STAT1 LED Green will turn ON if the battery voltage is below the threshold voltage The MCP73871 Demo Board with Voltage Proportional Current Control is designed to cover all the features of the MCP73871 device A thermistor can be added at test points TP6 and TP7 but resistor R6 must be removed see the A 2 Board Schematic The board layout easily permit to change the two programmable resistors RpRog1 and Rproc3 1 3 WHAT THE MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIONAL CURRENT CONTROL KIT INCLUDES This MCP73871 Demo Board with Voltage Proportional Current Control kit includes One MCP73871 Demo Board with Voltage Proportional Current Control 102 00244 Important Information Read First DS51812B page 10 2009 Microchip Technology Inc MCP73871 DEMO BOARD WITH VOLTAGE PROPORTIO
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