MCP1630DM-LED2 - Microchip Technology

MCP1630V

Bidirectional 4 Cell

Li-Ion Charger Reference Design

User’s Guide

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MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Table of Contents

Preface ........................................................................................................................... 1

Introduction............................................................................................................ 1

Document Layout .................................................................................................. 1

Conventions Used in this Guide ............................................................................ 2

Recommended Reading........................................................................................ 2

The Microchip Web Site ........................................................................................ 3

Customer Support ................................................................................................. 3

Document Revision History ................................................................................... 3

Chapter 1. Product Overview ........................................................................................ 5

1.1 Introduction ..................................................................................................... 5

1.2 What is the MCP1630V Bidirectional 4 Cell Li-Ion Charger

Reference Design? ................................................................................... 6

1.3 What the MCP1630V Bidirectional 4 Cell Li-Ion Charger

Reference Design kit includes .................................................................. 6

Chapter 2. Installation and Operation .......................................................................... 7

2.4 Introduction ..................................................................................................... 7

2.5 Features ......................................................................................................... 7

2.6 Getting Started ............................................................................................... 8

Appendix A. Schematics and Board Layouts............................................................ 11

A.1 Introduction .................................................................................................. 11

A.2 Schematic - Sheet 1 ................................................................................... 12

A.3 Schematic - Sheet 2 ................................................................................... 13

A.4 Board – Top Silk Layer ............................................................................... 14

A.5 Board – Top Metal Layer ............................................................................ 15

A.6 Board – Mid Layer1 .................................................................................... 16

A.7 Board – Mid Layer2 .................................................................................... 17

A.8 Board – Metal Layer ................................................................................... 18

A.9 Board – Bottom Silk Layer ......................................................................... 19

Appendix B. Bill Of Materials (BOM) .......................................................................... 21

Appendix C. Firmware ................................................................................................. 23

C.1 Device Firmware - Flowchart ....................................................................... 23

C.2 Device Firmware - Flowchart (Continued) ................................................... 24

Worldwide Sales and Service .................................................................................... 26

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

NOTES:

MCP1630V BIDIRECTIONAL 4 CELL
LI-ION CHARGER REFERENCE
DESIGN USER’S GUIDE
© 2006 Microchip Technology Inc. DS51641A-page 1
Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the 
MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design. 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 MCP1630V Bidirectional 4 Cell Li-Ion Charger 
Reference Design 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 MCP1630V 
Bidirectional 4 Cell Li-Ion Charger Reference Design.
•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. “Schematics and Board Layouts” – Shows the schematic and 
layout diagrams for the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference 
Design.
•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the 
MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design.
•Appendix C. “Firmware” – Provides information about the application firmware 
and where the source code can be found.
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.

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

RECOMMENDED READING

This user's guide describes how to use MCP1630V Bidirectional 4 Cell Li-Ion Charger

Reference Design. The following Microchip documents are available and

recommended as supplemental reference resources.

MCP1630/MCP1630V Data Sheet, "High-Speed, Microcontroller-Adaptable, Pulse

Width Modulator" (DS21896)

This data sheet provides detailed information regarding the MCP1630/MCP1630V,

product family.

PIC16F88 Data Sheet, "20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with

Nano Watt Technology” (DS30487)

This data sheet provides detailed information regarding the PIC16F88 product family.

APEC Conference Paper, "Bi-Directional Power System for Laptop Computers",

2005

This paper provides detailed information about powering laptop computers using 4

series cell Li-Ion batteries with a bidirectional laptop computer.

DOCUMENTATION CONVENTIONS

Description Represents 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

dialog

“Save project before build”

Underlined, italic text with

right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > 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:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Preface

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://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (November 2006)

• Initial Release of this Document.

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

NOTES:

MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

As high power portable applications continue to gain in popularity, more innovative

techniques are needed to charge the batteries while also providing a low regulated

voltage to the system’s high end digital electronics. For example, laptop computers,

portable test equipment, portable printers, etc., all require more power than a single or

two cell Li-Ion battery pack can efficiently store. As a result, three or four series Li-Ion

cell packs are used to store the necessary that power these high end applications. The

result is a high dc voltage used to store the energy requiring a difficult high voltage to

low voltage dc-dc conversion. The MCP1630V Bidirectional 4 Cell Li-Ion Charger Ref-

erence Design can be used to evaluate a design that boosts a low source voltage to

charge four Li-Ion series cells while providing energy to the system simultaneously.

When the source is removed, the same power train used to charge the battery pack

provides a low regulated voltage to operate the system.

This chapter covers the following topics.

• What is the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design?

• What the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design Kit

includes.

FIGURE 1-1: MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design

shown in Laptop Computer system level block diagram.

AC/DC

Converter

Wide Range

ac Input

(85 Vrms to 240 Vrms)

Low Voltage

dc Output (+7.0V)

+3.3V

DC/DC

Converter

+1.XV

DC/DC

Converter

Bidirectional

Charger and

DC/DC Converter

4 Cell Li-Ion

Battery Pack

dc-Bus

MCP1630V

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

1.2 WHAT IS THE MCP1630V BIDIRECTIONAL 4 CELL LI-ION CHARGER

REFERENCE DESIGN?

The MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design demonstrates

the use of a bidirectional buck-boost converter used to charge multiple series cell Li-Ion

batteries with the presence of an input source (boost) and provide a regulated output

voltage when the input source is removed (buck). The board also serves as a platform

to evaluate the MCP1630V device.

The MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design inputs were

developed to be easily attached to the I/O of a PIC® Microcontroller. The MCU supplies

the oscillator (OSC_IN) and reference voltage (VREF) to the MCP1630V creating a

flexible and adaptable power system. The power system switching frequency and

maximum duty cycle are set using the hardware PWM of the MCU. The reference input

to the high speed analog PWM can be external, a D/A Converter (DAC) output or as

simple as an I/O output from the MCU. This enables the power system to adapt to

external signals and variables in order to optimize performance and facilitate

calibration.

This board utilizes Microchip's MCP1630V (high-speed PIC MCU PWM MSOP8) with

the PIC16F88 (Flash MCU) in a four cell Li-Ion charger combined with a synchronous

buck regulator. Under normal operation, the input supply can range between 6.5V and

7.0V. The converter is capable of charging four Li-Ion cells connected in series when

the 6.5V input is present and regulating the bulk input voltage to 6.0V when the input

source voltage is removed by stepping, (bucking), down the battery pack voltage.

1.3 WHAT THE MCP1630V BIDIRECTIONAL 4 CELL LI-ION CHARGER

REFERENCE DESIGN KIT INCLUDES

This MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design kit includes:

• MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s

Guide (DS51641)

MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Chapter 2. Installation and Operation

2.4 INTRODUCTION

The MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design demonstrates

Microchip's high speed pulse width modulator (PWM) used in a four cell Li-Ion battery

charger combined power supply application. When used in conjunction with a micro-

controller, the MCP1630V will control the power system duty cycle to provide regulated

output voltage or current. The PIC16F88 microcontroller oscillator output is used to pro-

vide pulses at switching frequency of 500 kHz. The MCP1630V generates duty cycle

based on various external inputs. External signals include the input oscillator pulses

from PIC16F88, the reference voltage and the feed back voltage. The output signal is

a square wave pulse provided to the synchronous gate drive input. They synchronous

gate driver is used to turn on and off the upper buck MOSFET and lower synchronous

MOSFET.

The PIC16F88 microcontroller is programmable, allowing the user to modify or develop

their own firmware routines to further evaluate the MCP1630V in this application.

2.5 FEATURES

The MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design has the following

features:

• Four Cell Li-Ion Battery Charger, operates stand alone. (Additional firmware

added allows the charger to communicate with smart battery packs)

• Charges four cell Li-Ion battery pack from 6.5V to 7.0V Input (complete

precondition, constant current and constant voltage charge algorithm in firmware)

• Regulates input dc bus voltage, (steps battery pack voltage down), to 6.0V when

input source is removed (providing uninterrupted power source for system)

• ON/OFF button used to enable and disable system, low IQ drain on the battery

when disabled (< 10 µA)

• Output over-voltage protection in the event of open battery connections

• High efficiency over entire operating input voltage range (94% typical)

• PIC16F88 is used to generate ref Voltage and Oscillator signal at 500 kHz

frequency at maximum duty cycle

• Proprietary features can be added by modifying the firmware contained in the

PIC16F88

• Factory programmed source code is available

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

2.6 GETTING STARTED

The MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design is fully

assembled and tested for charging a four series cell Li-Ion battery pack (Battery Pack

should have internal overvoltage, overcurrent and overtemperature protection). The

board requires the use of an external input voltage source (+7.0V) for charging.

2.6.1 Power Input and Output Connection

2.6.1.1 POWERING THE MCP1630V BIDIRECTIONAL 4 CELL LI-ION

CHARGER REFERENCE DESIGN

1. Connect the positive side of the +6.5V to +7.0V input to J2 Pin 2, connect the

negative side (or ground) to Pin 1 of J2. This source voltage should not exceed

7.0 and be rated for 8A minimum supply current.

2. Connect the positive side of the Four cell Li-Ion battery pack voltage to J1 Pin 1,

connect the battery pack return to the negative side of J1 Pin 2.

3. Once the SW1 push button is pressed, the MCP1630V Bidirectional 4 Cell Li-Ion

Charger Reference Design is powered. When powered, a charge cycle will start

automatically if the 7.0V is connected and all preconditions are meet, (see

Appendix C. “Firmware”).

4. LED D3 will be illuminated when the board is running, (charging or bucking).

5. LED D5 will flash only when a charge cycle is in progress.

6. Again, a subsequent pressing of the SW1 push button during normal operation

of the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design will

power-off the converter.

FIGURE 2-2: Board Top Assembly and Connections

Note: Both supplies should have a separate isolated return (ground), there is a

current sense resistor between the +7.0V (VBULK) and +14V(VBATT) supply

returns. If the returns are connected, the charge current can not be

controlled.

LOCATIONS

FOR

D3 D5

CONN

ICD 2

SW1

SWITCH

+14 VBAT

+7V

Installation and Operation

2.6.1.2 APPLYING BATTERY TO MCP1630V BIDIRECTIONAL 4 CELL LI-ION

CHARGER REFERENCE DESIGN

A four cell battery pack (with internal protection) is connected to the J1 connector

before applying input power and pressing SW1 to start the charge cycle. Once the

battery pack is connected, SW1 can be pressed to start the synchronous buck

converter (assuming there is no 7.0V input applied to J2). With the battery pack

connected, the source for J2 can be “hot” plugged in and out, a voltage will always be

present on J2 until SW1 is pressed shutting off the converter.

2.6.1.3 ALTERNATIVE BATTERY PACK SIMULATOR

As an alternative to the four cell Li-Ion battery pack, a battery pack simulation circuit

can be used, (Figure 2-3). This simulation circuit consists of an adjustable metal wound

power load resistor (10Ω, 100W), Aluminum Electrolytic Capacitor (3,300 µF 25V) and

Schottky Diode (10V, 30V). For evaluating the bidirectional converter design, the bat-

tery simulator circuit is recommended. When using the battery pack simulator, the

operating point for charging and discharging can be easily be adjusted using the VBATT

power supply and load resistor value.

2.6.1.4 LED STATUS INDICATION

Two LED’s are connected to the I/O of the PIC16F88 to provide status of the charger.

LED D3 provides indication that the converter is running while LED D5 flashing

provides indication that the converter is charging. With a 6.5V to 7.0V source applied

to J2 while the converter is running, a charge cycle is initiated. Once the charge cycle

is complete, the charger will continue to operate providing 0 mA of current to the

battery. If the source is removed from J2, the converter will regulate the VBULK voltage

to 6.0V with a load up to 6A.

Evaluating the Application

The best way to evaluate the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference

Design is to operate the bidirectional power system over a wide range using the battery

pack simulator. The simulator consists of a 10Ω power resistor, diode and variable

voltage source. When configured as shown in Figure 2-3, the circuit will simulate a

battery. The load resistor is used to sink current from the charger while a large capacitor

is used to simulate the battery voltage (VSIM). By adjusting the VSIM voltage, different

operating points in the charge cycle can be evaluated.

Once evaluated using the battery pack simulator, the bi-directional reference design

can be used to run charge and discharge cycles using a four cell Li-ion battery pack. If

using an actual Li-ion battery pack, it must have the proper protection features

including, (overvoltage, overcurrent, overtemperature, etc.).

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

FIGURE 2-3: Battery Simulator Circuit.

Firmware

The PIC16F88 comes pre programmed with firmware to operate the system as

described above. The file listing and firmware flow diagram are shown in Appendix

C. “Firmware”.

Programming

Header J4 is provided for In-Circuit Serial Programming™ (ICSP™). This is an optional

feature since the demo board comes preprogrammed with firmware to operate the

system. The PIC16F88 can be reprogrammed with the Baseline Flash Microcontroller

Programmer (BFMP).

10Ω

3,300 µF VSIM

+VBATT

J1-1

-VBATT

J1-2

+12V to +17.5V

MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Appendix A. Schematics and Board Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP1630V Bidi-

rectional 4 Cell Li-Ion Charger Reference Design:

• Board – Schematic Sheet 1

• Board – Schematic Sheet 2

• Board – Top Silk Layer

• Board – Top Metal Layer

• Board – Internal MidLayer 1

• Board – Internal MidLayer 2

• Board – Metal Layer

• Board – Bottom Silk Layer

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

A.2 SCHEMATIC - SHEET 1

Schematics and Board Layouts

A.3 SCHEMATIC - SHEET 2

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

A.4 BOARD – TOP SILK LAYER

BOARD

Schematics and Board Layouts

A.5 BOARD – TOP METAL LAYER

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

A.6 BOARD – MID LAYER1

Schematics and Board Layouts

A.7 BOARD – MID LAYER2

MIDLAYER2

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

A.8 BOARD – METAL LAYER

Schematics and Board Layouts

A.9 BOARD – BOTTOM SILK LAYER

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

NOTES:

MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

QTY Reference

Designator Description Manufacturer Part Number

2 C1, C2 CAP CER 10UF 25V X5R 1210 Taiyo Yuden®TMK325BJ106MN-T

2 C3, C17 CAP CERM.22UF 10% 10V X7R 0603 AVX Corporation 0603ZC224KAT2A

2 C4, C29 CAP CERAMIC 1.0UF 10V X5R 0603 Kemet® Electronics Corp C0603C105K8PACTU

2 C5, C6 CAP TANT 100UF 10V 20% POLY SMD EPCOS Inc. B76010V1079M055

12 C7, C11, C13,

C16, C18, C19,

C20, C21, C22,

C26, C28

CAP .10UF 10V CERAMIC X7R 0603 Kemet Electronics Corp C0603C104K8RACTU

1 C8 CAP CERM 8200PF 10% 50V X7R

0603

AVX Corporation 06035C822KAT2A

1 C9 CAP CER 2200PF 50V C0G 5% 0603 TDK Corporation C1608C0G1H222J

1 C10 CAP CERAMIC 330PF 50V NP0 0603 Kemet Electronics Corp C0603C331J5GACT

1 C12 CAP 3300PF 50V CERAMIC X7R 0603 Kemet Electronics Corp C0603C332K5RACTU

2 C14 CAP CERAMIC 120PF 50V NP0 0603 Kemet Electronics Corp C0603C121J5GACTU

1 C15 CAP CERAMIC 100PF 50V NP0 0603 Kemet Electronics Corp C0603C101J5GACTU

1 C23 CAP CERAMIC 180PF 50V NP0 0603 Kemet Electronics Corp C0603C181J5GACTU

1 C24 CAP CERAMIC 10PF 50V NP0 0603 Kemet Electronics Corp C0603C100J5GACTU

1 C30 CAP 10000PF 50V CERAMIC X7R

0603

Kemet Electronics Corp C0603C103K5RACTU

1 C31 CAP 1500PF 50V CERAMIC X7R 0603 Kemet Electronics Corp C0603C152K5RACTU

2 D1 DIODE SCHOTTKY 30V 200MW

SOD123

Diodes Inc. BAT42W-7-F

1 D2 IC ADJ SHUNT REGULATOR

SOT-23-5

Texas Instruments TL431IDBVR

2 D3, D5 LED 660NM SUPER RED DIFF

0603SMD

Lumex® Opto/

Components Inc

SML-LX0603SRW-TR

1 F1 FUSE 5.0A 32V FAST SMD 0603 Tyco® Electronics/

Raychem Circuit

Protection

0603SFF500F/32-2

2 J1, J2 CONN TERM BLOCK 2POS 5MM PCB Phoenix Contact 1715022

1 J3 CONN MOD JACK 6-6 RT/A PCB 50AU Tyco Electronics/Amp 5555165-1

1 J4 CONN HEADER VERT 3POS.100 TIN Tyco Electronics/Amp 640454-3

1 L1 INDUCTOR POWER HI CURR 10UH

SMD

Coiltronics/Div of

Cooper/Bussmann

HC1-100-R

1 Q1 MOSFET N-CH 30V 35A DPAK International Rectifier IRLR3303PBF

1 Q2 MOSFET N-CH 30V 91A DPAK International Rectifier IRLR8103VPBF

4 Q3, Q6, Q7,

MOSFET N-CH 30V 1.2A SSOT3 Fairchild Semiconductor NDS351AN

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.

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

1 Q4 MOSFET P-CH 30V 610MA SOT-23 International Rectifier IRLML5103TRPBF

1 Q5 TRANSISTOR GP NPN AMP SOT-23 Fairchild Semiconductor®MMBT3904

0 R1, R21 SMT0603 RESISTOR

DO NOT POPULATE

——

1 R2 RES 499K OHM 1/10W 1% 0603 SMD Panasonic® - ECG ERJ-3EKF4993V

2 R3, R33 RES 9.53K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF9531V

2 R4, R5 RESISTOR .100 OHM 1W 1% 2512 Panasonic - ECG ERJ-L1WKF10CU

5 R6, R7, R13,

R29, R39

RES 10.0K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1002V

1 R8 RES 1.50K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1501V

6 R9, R15, R19,

R22, R38

RES 10.0K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1002V

1 R10 RES 1.00K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1001V

3 R11, R42, R43 RES 47.5K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4752V

1 R12, R17 RES 15.0K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1502V

1 R14 RES 6.98K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF6981V

2 R16, R32 RES 49.9K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4992V

3 R18, R40, R45 RES 2.00K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2001V

1 R20 RES 150 OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1500V

3 R23, R34, R37 RES 7.87K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF7871V

1 R24 RESISTOR 1.20M OHM 1/10W 1%

0603

Panasonic - ECG ERJ-3EKF1204V

1 R25 RES 30.1K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF3012V

3 R26, R27 RES 4.99K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4991V

1 R28 RES 43.2K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF4322V

1 R30 RES 14.7K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1472V

1 R31 RES 24.9K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2492V

1 R35 RES 1.62K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF1621V

1 R36 RES 221K OHM 1/10W 1% 0603 SMD Panasonic - ECG ERJ-3EKF2213V

1 R44 RES 3.3 OHM 1W 1% 2512 SMD Panasonic - ECG ERJ-1TRQF3R3U

1 SW1 SWITCH TACT 6MM 260GF SMT E-Switch TL3301NF260QG

6 TP1, TP2, TP3,

TP4, TP5, TP6

PC TEST POINT COMPACT SMT Keystone Electronics®5016

1 U1 IC DRIVER MOSFET DUAL SYNC

8SOIC

Intersil ISL6207CBZ

1 U2 MCP1630V HIGH SPEED ANALOG

PWM

Microchip Technology Inc. MCP1630V-E/MS

2 U3, U4 DUAL10MHz AMPLIFIER 8 PIN

TSSOP PACKAGE

Microchip Technology Inc. MCP6022-I/ST

1 U5 IC MCU FLASH 4KX14 EEPROM

20SSOP

Microchip Technology Inc. PIC16F88T-I/SS

1 U7 IC DGTL THERM SENSOR 5V

SOT23A-5

Microchip Technology Inc. TC74A5-5.0VCTTR

TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)

QTY Reference

Designator Description Manufacturer Part Number

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.

MCP1630V BIDIRECTIONAL 4 CELL

LI-ION CHARGER REFERENCE

DESIGN USER’S GUIDE

Appendix C. Firmware

C.1 DEVICE FIRMWARE - FLOWCHART

For the latest copy of the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference

Design User’s Guide firmware, visit our web site at www.microchip.com.

FIGURE C-1: Firmware Flowchart, page 1.

START

Initialize Ports, ADC, PWM, etc.

Read ADC Inputs

VBATT and VBULK

Is Charge

State @ Idle?

Yes

VBATT>12.8V

Yes

Set State to

P. C .

Is Charge

State @ C.C.

VBATT > 12.8V

Set State to

C.C

Yes

Inc. IBATT

VBATT>16.8V

Yes

Set State to

C.V.

Is Charge

State @ C.V.

VBATT > 16.8V

Dec. IBATT

VBATT<16.3V

Yes

to IMAX

Charge States

Idle = 0 mA

P.C. = Pre-Charge

C.C. = Constant Current

C.V. = Constant Voltage

Is Charge

State @ P.C.?

MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference Design User’s Guide

C.2 DEVICE FIRMWARE - FLOWCHART (CONTINUED)

For the latest copy of the MCP1630V Bidirectional 4 Cell Li-Ion Charger Reference

Design User’s Guide firmware, visit our web site atwww.microchip.com

FIGURE C-2: Firmware Flowchart, page 2.

IBATT < 100 mA

Is SW1

Pressed?

Yes

Shutdown

Set Charge

to Idle

Yes

End

VBATT<12.8V

VBULK<6.5V

Yes

Firmware

NOTES:

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10/19/06