MCP1630 NiMH
Battery Charger Demo Board
User’s Guide
© 2006 Microchip Technology Inc.
DS51505B
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DS51505B-page ii
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview ....................................................................................... 5
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP1630 NiMH Battery Charger Demo Board? ......................... 6
1.3 What the MCP1630 NiMH Battery Charger Demo Board Kit Includes ........... 6
Chapter 2. Installation and Operation ......................................................................... 7
2.1 Introduction ..................................................................................................... 7
2.2 Features ......................................................................................................... 7
2.3 Getting Started ............................................................................................... 8
Appendix A. Schematic and Layouts ........................................................................ 11
A.1 Introduction .................................................................................................. 11
A.2 Board Schematic - Page 1 ......................................................................... 12
A.3 Board Schematic - Page 2 ......................................................................... 13
A.4 Board - Top Layer ...................................................................................... 14
A.5 Board - Bottom Layer ................................................................................. 15
A.6 Board - Mid-Layer 1 ................................................................................... 16
A.7 Board - Mid-Layer 2 ................................................................................... 17
Appendix B. Bill Of Materials (BOM) ......................................................................... 19
Appendix C. Evaluation Board Firmware .................................................................. 21
C.1 Device Firmware .......................................................................................... 21
Worldwide Sales and Service .................................................................................... 24
© 2006 Microchip Technology Inc.
DS51505B-page iii
MCP1630 NiMH Battery Charger Demo Board User’s Guide
NOTES:
DS51505B-page iv
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO 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
“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
MCP1630 NiMH Battery Charger Demo 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 MCP1630 NiMH Battery Charger Demo
Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1630
NiMH Battery Charger Demo Board.
• Chapter 2. “Installation and Operation” – This chapter includes instructions on
how to get started, as well as a description of the MCP1630 NiMH Battery
Charger Demo Board.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP1630 NiMH Battery Charger Demo Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1630 NiMH Battery Charger Demo Board.
• Appendix C. “Evaluation Board Firmware” – Provides information about the
application firmware and where the source code can be found.
© 2006 Microchip Technology Inc.
DS51505B-page 1
MCP1630 NiMH Battery Charger Demo 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
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® 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
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)
{ ...
}
RECOMMENDED READING
This user's guide describes how to use the MCP1630 NiMH Battery Charger Demo
Board. The following Microchip documents are available and recommended as
supplemental reference resources.
MCP1630 Data Sheet, “High-Speed, Microcontroller-Adaptable, Pulse Width
Modulator” (DS21896)
This data sheet provides detailed information regarding the MCP1630 product family.
DS51505B-page 2
© 2006 Microchip Technology Inc.
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
Development Systems Information Line
Customers should contact their distributor, representative or field application engineer
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 B (March 2006)
• Updated Bill of Materials (BOM) to show RoHS-compliant part numbers.
Revision A (September 2004)
• Initial Release of this Document.
© 2006 Microchip Technology Inc.
DS51505B-page 3
MCP1630 NiMH Battery Charger Demo Board User’s Guide
NOTES:
DS51505B-page 4
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP1630 NiMH Battery Charger Demo Board is used to evaluate the Microchip
MCP1630 used in a SEPIC power-converter application. The evaluation board is a
complete stand-alone 4-cell NiMH battery charger that utilizes an 8V to 15V input
capable of charging 4 NiMH batteries in series.
MCP1630 NiMH Battery Charger and Fuel Gauge Application Diagram
CC
+VBATT
SEPIC Converter
+8V to +15V Input Voltage
4 NiMH Cells
+5V Bias
Cout
CIN
MCP1630
Linear
Regulator
1:1
VIN
N-Channel
MOSFET
COMP VEXT
IBATT
FB
OSC IN
VREF
+VBATT
CS
ISW
GND
+5V Bias
+
–
3V
0V
PIC16LF818
PWM OUT
MCP1700
3.0V
SOT-23
VDD
VDD
–
A/D
1/2 MCP6042
+
VDD
I2C™ Interface
To System
I/O
A/D
+
A/D
1/2 MCP6042
–
TC1047A
FIGURE 1-1:
NiMH Charger Block Diagram.
© 2006 Microchip Technology Inc.
DS51505B-page 5
MCP1630 NiMH Battery Charger Demo Board User’s Guide
1.2
WHAT IS THE MCP1630 NIMH BATTERY CHARGER DEMO BOARD?
The MCP1630 NiMH Battery Charger Demo Board is a complete stand-alone constant
current battery charger and simple fuel gauge for four NiMH series batteries. This
board utilizes Microchip’s MCP1630 (high-speed PIC® MCU PWM MSOP-8),
MCP1700T (LDO Regulator SOT-23), MCP6042T (Op Amp MSOP-8), PIC16LF818
(MCU Flash SSOP-20), TC54 (Voltage Detector SOT-23A) and TC1047A (Temp-Volt
Converter SOT-23B). The input voltage range for the demo board is 8V to 15V. The
output is capable of charging four NiMH batteries with up to 1.6V per cell at a fast
charge rate of 500 mA contant current.
Input terminals are provided to apply an intput voltage to the charger. Output terminals
are also provided as a way to connect the external NiMH batteries or a simulated
battery load.
1.3
WHAT THE MCP1630 NIMH BATTERY CHARGER DEMO BOARD KIT
INCLUDES
This MCP1630 NiMH Battery Charger Demo Board Kit includes:
• The MCP1630 NiMH Battery Charger Demo Board
• MCP1630 NiMH Battery Charger Demo Board User’s Guide (DS51505)
• MCP1630 Data Sheet, “High-Speed, Microcontroller-Adaptable, Pulse Width
Modulator” (DS21896)
DS51505B-page 6
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1630 NiMH Battery Charger Demo Board demonstrates Microchip’s
MCP1630 high-speed Pulse Width Modulator (PWM) used in a smart battery charger
application. The MCP1630 is a high-speed, microcontroller-adaptable PWM that, when
used in conjunction with a microcontroller, will control the power system duty cycle to
provide output voltage or current regulation. The PIC16LF818 microcontroller can be
used to regulate output voltage or current, switching frequency and maximum duty
cycle. The MCP1630 generates pulse-by-pulse duty cycle, provides fast overcurrent
protection and utilizes variable external inputs. External signals include the input
oscillator and the reference voltage. The power train signals include the current sense
and the feedback voltage; the output signal is a square-wave pulse. The power train
used for the MCP1630 NiMH Battery Charger Demo Board is a Single-Ended Primary
Inductive Converter (SEPIC).
2.2
FEATURES
The MCP1630 NiMH Battery Charger Demo Board has the following features:
• Programmed charge currents:
- Fast Charge = 500 mA
- Trickle Charge = 50 mA
- Top-Off Charge = 25 mA
• Overvoltage protection (battery removed)
• Overcharge protection to prevent the battery from becoming dangerously
overcharged
• Overdischarge protection to prevent the battery from being damaged
• Overcurrent protection in the event of a shorted battery
• Battery reversal protection
• Input short circuit protection
• Fast charge termination if the battery or ambient temperature is too high
• Soft-start capability by holding the reference voltage low during power-up
• The MCP1630 NiMH Battery Charger Demo Board terminates charge by detecting a predefined change in voltage with respect to time, a specified temperature or
specified elapsed time
• A simple fuel gauge that has a dual MCP6042 amplifier, a 1-channel sense
voltage and a 1-channel sense current
• The MCP1630 NiMH Battery Charger Demo Board has the flexibility to optimize
the charging algorithm for new battery technology and add proprietary features by
coding the microcontroller
• Ability to adapt to environmental effects, such as ambient temperature
• Uses a very low standby current of 29 μA
© 2006 Microchip Technology Inc.
DS51505B-page 7
MCP1630 NiMH Battery Charger Demo Board User’s Guide
2.3
GETTING STARTED
The MCP1630 NiMH Battery Charger Demo Board is fully assembled and tested for
charging four 1,000 mA/hour NiMH batteries in series from 3.2V to 6V in accordance
with the recommended charge profile for NiMH batteries. This board requires the use
of an external input voltage source (+8V to +15V) and external load (battery or simulated battery load). It is recommended that four NiMH cells connected in series to act
as a load or the recommended simulated load be used.
2.3.1
Power Input and Output Connections
2.3.1.1
POWERING THE MCP1630 NiMH BATTERY CHARGER DEMO BOARD.
1. Apply the input voltage to the surface mount test points provided. The input
voltage source should be limited to the 0V to +15V range. For normal operation,
the input voltage should be between +8V and +15V. However, the input voltage
must not exceed +15V maximum. The source current necessary to regulate the
output voltage to 6.4V at 500 mA should be a minimum of approximately 800 mA.
2. Connect the positive side of the input source (+) to test point TP2. Connect the
negative (or return side) (–) of the input source to the GND test point TP3. TP2
is located just above TP3 in the upper-left corner of the board.
2.3.1.2
APPLYING THE LOAD TO THE MCP1630 NiMH BATTERY CHARGER
DEMO BOARD.
1. To apply a load to the MCP1630 NiMH Battery Charger Demo Board, the positive
side of the load (+) should be connected to test point TP1. The negative side of
the load (–) should be connected to test point TP4. Care should be taken when
using electronic or ground-referenced loads, and never connect TP4 to ground.
The battery current sense is referenced in the return leg, so connecting TP4 to
ground will short out the current sense. The typical charge current is 50 mA while
the battery is in the Trickle Charge mode or the battery voltage is below 0.8V/cell.
The current is typically 500 mA when the battery is in the Fast Charge mode and
typically 25 mA when the battery is in the Top-off Charge mode. The charge
current is automatically regulated by the MCP1630.
2. The code will prevent the board from entering the 500 mA Fast Charge mode if
the battery terminal voltage is less than 3.2V (0.8V / Cell). During power up, the
board will always trickle charge first, so using a purely resistive load will not work
for trickle and fast charge currents. The best way to evaluate the charger is to
use four series NiMH batteries or the recommended simulated battery load.
TP1
+
Charger
–
+
1,000 μF
–
10V Al
+
10Ω
5 Watt
–
4V Lab Supply
TP4
FIGURE 2-1:
DS51505B-page 8
Simulated Battery Load.
© 2006 Microchip Technology Inc.
Installation and Operation
2.3.1.3
STATUS LEDS
The MCP1630 NiMH Battery Charger Demo Board has two LEDs. D1 is a red LED that
is used to indicate when input power is available. When the +12V input is connected,
D1 will be illuminated. The other LED (D9) has two LEDs built into a SOT-23 package.
These can be off, red, green or both on (amber). To conserve energy, D9 is never
illuminated when there is no input power. If both LEDs are off, that is an indication there
is no power supplied to the board input.
Under normal power-up conditions, the charger will begin with a 50 mA trickle charge.
The microcontroller will then check the status of the batteries to ensure that they are
present, their temperature is within range and the series voltage is within specified
charging limits. For visual LED charge status, a dual-color SOT-23 LED is used (D9).
- D9 Status Indication Normal Charge Modes:
Normal Charge Mode
Board Status
Red LED
Green LED
Initial Trickle Charge (50 mA)
ON (Solid)
OFF
Fast Charge (500 mA)
ON (Solid)
ON (Solid)
Final Trickle Charge (50 mA)
OFF
ON (Solid)
Top Off Charge (25 mA)
OFF
ON (Solid)
Charge Complete (0 mA)
OFF
ON (Blinking, 1 sec)
ON (Solid)
OFF
Red LED
Green LED
ON (Blinking)
OFF
ON (Blinking Faster)
OFF
ON Blinking
OFF
Initial Trickle Charge (50 mA)
- D9 Status Indication for Fault Modes:
Fault Mode Board Status
Overvoltage Initial
(Restart Initiated)
Overvoltage
(Persistent, Latched-off after 9
attempts)
Overcurrent
With no input connected and 4 NiMH batteries used as a load, the MCP1630 NiMH
Battery Charger Demo Board will consume approximately 29 μA from the battery.
A temperature sensor is provided for charge termination. The sensor (U2) is located on
the back of the printed circuit board. To utilize this feature, batteries should be in
physical contact with the temperature sensor.
Programming:
- J1 can be used as a Flash programming port to modify the code for prototype applications. The pinout of J1 matches the required pinout for the
MPLAB® ICD 2 programmer.
© 2006 Microchip Technology Inc.
DS51505B-page 9
MCP1630 NiMH Battery Charger Demo Board User’s Guide
NOTES:
DS51505B-page 10
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the schematics and layouts for the MCP1630 NiMH Battery
Charger Demo Board. The diagrams included in this appendix include:
•
•
•
•
•
Board Schematic
Board - Top Layer
Board - Bottom Layer
Board - Mid-Layer 1
Board - Mid-Layer 2
© 2006 Microchip Technology Inc.
DS51505B-page 11
MCP1630 NiMH Battery Charger Demo Board User’s Guide
BOARD SCHEMATIC - PAGE 1
(BACK)
(BACK)
A.2
DS51505B-page 12
© 2006 Microchip Technology Inc.
Schematic and Layouts
D
BOARD SCHEMATIC - PAGE 2
(BACK)
(BACK)
(BACK)
(BACK)
G
S
A.3
1
(BACK)
(BACK)
(BACK)
2
3
© 2006 Microchip Technology Inc.
DS51505B-page 13
MCP1630 NiMH Battery Charger Demo Board User’s Guide
A.4
BOARD - TOP LAYER
TOP LAYER
DS51505B-page 14
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD - BOTTOM LAYER
© 2006 Microchip Technology Inc.
DS51505B-page 15
MCP1630 NiMH Battery Charger Demo Board User’s Guide
A.6
BOARD - MID-LAYER 1
DS51505B-page 16
© 2006 Microchip Technology Inc.
Schematic and Layouts
BOARD - MID-LAYER 2
MID2
A.7
© 2006 Microchip Technology Inc.
DS51505B-page 17
MCP1630 NiMH Battery Charger Demo Board User’s Guide
NOTES:
DS51505B-page 18
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
6
C1, C2, C4,
“Do Not Populate” DNP0603
C10, C13, C22
—
—
8
C3, C5, C6,
C7, C14, C15,
C17, C24
CAP .10UF 10V CERAMIC X7R 0603
Kemet® Electronics
C0603C104K8RACTU
2
C8, C9
CAP CERAMIC 4.7UF 16V X5R 0805
Panasonic® - ECG
ECJ-2FB1C475K
1
C11
CAP CERAMIC 470PF 50V NP0 0603
Panasonic - ECG
ECJ-1VC1H471J
3
C12, C19, C20 CAP CER 1.0UF 10V 10% X5R 0603
Murata Electronics®
North America
GRM188R61A105KA61
D
2
C16,C21
CAP CERAMIC 22PF 50V NP0 0603
Kemet Electronics
C0603C220J5GACTU
1
C18
CAP 10000PF 50V CERAMIC X7R 0603
Kemet Electronics
C0603C103K5RACTU
1
C23
CAP CERAMIC 1UF 25V X5R 0805
Panasonic - ECG
ECJ-2FB1E105K
1
D1
LED 660NM SUPER RED DIFF 0603SMD Lumex® Opto/
Components Inc.
SML-LX0603SRW-TR
1
D4
DIODE SWITCH 75V 200MW SOT-323
Diodes Inc.
BAS16W-7
1
D5
DIODE SCHOTTKY 25V 1.0A MINI-2P
Panasonic - SSG
MA2YD2300L
2
D6, D8
“Do Not Populate” SOT-323
—
—
Semiconductor®
1
D7
DIODE SWITCH DUAL CC 50V SOT-23
ON
1
D9
LED DUAL RED/GREEN CLEAR SOT-23
Lumex Opto/
Components Inc.
SML-LX15IGC-RP-TR
1
J1
CONN MOD JACK 6-6 R/A PCB 50AU
AMP®/Tyco®
Electronics
5520470-3
1
J2
CONN HEADER VERT 3POS .100 TIN
AMP/Tyco Electronics 640454-3
1
J3
CONN HEADER VERT 2POS .100 TIN
AMP/Tyco Electronics 640454-2
1
Q1
HEX/MOS N-CH 20V 4.2A SOT-23
International Rectifier
IRLML2502TR
1
Q3
MOSFET N-CH 30V 1.7A 3-SSOT
Fairchild
Semiconductor®
NDS355AN
2
R1, R2
RES 200 OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF2000V
9
R3, R5, R6
RES 47.5K OHM 1/16W 1% 0603 SMD
R7, R8, R9
R10, R11, R12
Panasonic - ECG
ERJ-3EKF4752V
1
R4
Panasonic - ECG
ERJ-3EKF2491V
5
R13, R14, R29, “Do Not Populate” 0603
R30, R37
-
-
1
R15
RES 20K OHM 1/16W .1% 0603 SMD
Panasonic - ECG
ERA-3YEB203V
1
R16
RES ZERO OHM 1/10W 5% 0603 SMD
Panasonic - ECG
ERJ-3GEY0R00V
2
R17, R34
RES 301K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF3013V
3
R18, R35, R36 RES 30.1K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF3012V
3
R19, R20, R27 RES 1.00K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1001V
1
R21
Panasonic - ECG
ERJ-8RQFR39V
RES 2.49K OHM 1/16W 1% 0603 SMD
RES .39 OHM 1/4W 1% 1206 SMD
© 2006 Microchip Technology Inc.
BAV74LT1
DS51505B-page 19
MCP1630 NiMH Battery Charger Demo Board User’s Guide
TABLE B-1:
Qty
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Description
Manufacturer
Part Number
1
R22
RES .15 OHM 1/8W 5% 0805 SMD
Panasonic - ECG
ERJ-6RSJR15V
1
R23
RES 4.3K OHM 1/16W .5% 0603 SMD
Susumu Co Ltd
RR0816P-432-D
1
R24
RES 243K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF2433V
1
R25
RES 150K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1503V
1
R26
RES 16.0K OHM 1/16W .5% 0603 SMD
Susumu Co Ltd
RR0816P-163-D
1
R28
RES 10.0K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1002V
1
R31
RES 107K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1073V
2
R32, R33
RES 61.9K OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF6192V
1
R38
RES 249 OHM 1/16W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF2490V
3
S1, S2, S3
SWITCH TACT 6MM 260GF SMT
E-Switch, Inc.
TL3301NF260QG
BH Electronics
L11-1016
1
T1
4
TP1, TP2, TP3, PC TEST POINT COMPACT SMT
TP4
Keystone Electronics® 5016
1
U1
IC MCU FLASH 1KX14 EEPROM
20-SSOP
Microchip Technology, PIC16LF818-I/SS
Inc.
1
U2
IC TEMP-VOLT CONV PREC SOT-23B
Microchip Technology, TC1047AVNBTR
Inc.
1
U3
High-Speed PIC PWM MSOP8
Microchip Technology, MCP1630-E/MS
Inc.
1
U4
IC OPAMP 1UA 1.4V DUAL R-R 8MSOP
Microchip Technology, MCP6042T-I/MS
Inc.
1
U5
IC VREG MINI 5V 50MA SOT-23
Zetex Inc.
ZMR500FTA
1
U6
IC COMPARATOR R-R OUT SC-70-5
National
Semiconductor®
LMV7219M7
1
U7
IC LDO REG 250MA 3.0V SOT-23
Microchip Technology, MCP1700T-3002E/TT
Inc.
1
U8
IC VOLT DETECTOR 2.9V SOT23A
Microchip Technology, TC54VC2902ECB713
Inc.
DS51505B-page 20
8th-PAK SMT Dual Inductor
®
© 2006 Microchip Technology Inc.
MCP1630 NiMH BATTERY CHARGER
DEMO BOARD USER’S GUIDE
Appendix C. Evaluation Board Firmware
C.1
DEVICE FIRMWARE
For the latest version of the MCP1630 NiMH Battery Charger Demo Board User’s
Guide firmware, visit the Microchip web site at www.microchip.com.
Power-Up
Initialize:
Ports, Clocks, A/D,
PWM, IIC, and
Interrupts
Yes
Is Input
Present?
No
Is Battery
> 3.2V ?
No
Sleep Mode
Yes
Trickle Charge:
Turn-on RED LED,
Start PWM, Soft-start
C/20 Rate
No
No
Is Input
Present?
Yes
Is Input
Present?
Yes
Is Battery
> 3.2V ?
No
No
Timer
Expired?
Yes
In Overvoltage?
Yes
Yes
Hiccup Restart:
Stop PWM
No
Fast Charge:
Turn-on GREEN
LED, C/2 Rate
Persistent?
No
Yes
No
Is Input
Present?
Yes
In Overvoltage?
Yes
No
Full
Charge?
No
No
Timer
Expired?
Yes
Yes
A
FIGURE C-1:
B
C
D
E
Firmware Flowcharge - Page 1.
© 2006 Microchip Technology Inc.
DS51505B-page 21
Evaluation Board Firmware
A
B
C
D
Top-off Charge:
Turn-off RED LED,
C/20 Rate Followed
BSy C/40 Rate
No
Fault:
Flash RED LED
Yes
Is Input
Present?
Yes
In Overvoltage?
E
Is Input
Present?
No
Yes
No
Recharge?
Yes
No
Timer
Expired?
No
Yes
Charge Complete:
Flash GREEN LED,
C/40 Rate
No
Is Input
Present?
Yes
Recharge?
Yes
No
Timer
Expired?
No
Yes
FIGURE C-2:
Firmware Flowchart - Page 2.
© 2006 Microchip Technology Inc.
DS51505B-page 22
Evaluation Board Firmware
NOTES:
© 2006 Microchip Technology Inc.
DS51505B-page 23
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Fax: 886-2-2508-0102
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Tel: 66-2-694-1351
Fax: 66-2-694-1350
02/16/06
DS51505B-page 24
© 2006 Microchip Technology Inc.