MCP1630 Automotive Input, Tri-Output Converter Demo Board

MCP1630 Automotive Input
Triple Output Converter
Demo Board
User’s Guide
© 2006 Microchip Technology Inc.
DS51627A
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DS51627A-page ii
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD 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 MCP1630 Automotive Input Triple Output Converter
Demo Board? ........................................................................................... 6
1.3 What the MCP1630 Automotive Input Triple Output Converter
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 ..................................................................................... 12
A.3 Board – Top Silk Layer ............................................................................... 13
A.4 Board – Top Metal Layer ............................................................................ 14
A.5 Board – Bottom Metal Layer ...................................................................... 15
Appendix B. Bill Of Materials (BOM) ......................................................................... 17
Appendix C. Demo Board Firmware .......................................................................... 19
C.1 Device Firmware .......................................................................................... 19
Worldwide Sales and Service .................................................................................... 20
© 2006 Microchip Technology Inc.
DS51627A-page iii
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
NOTES:
DS51627A-page iv
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
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 Automotive Input Triple Output Converter 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 Automotive Input Triple Output
Converter Demo Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP1630
Automotive Input Triple Output Converter Demo 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 MCP1630 Automotive Input Triple Output Converter Demo
Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP1630 Automotive Input Triple Output Converter Demo Board.
• Appendix C. “Demo Board Firmware” – Provides information about the application firmware and where the source code can be found.
© 2006 Microchip Technology Inc.
DS51627A-page 1
MCP1630 Automotive Input Triple Output Converter 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
‘bnnnn
Text in angle brackets < >
Courier font:
Plain Courier
Italic Courier
0xnnnn
Square brackets [ ]
Curly brackets and pipe
character: { | }
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 binary number where n is a
digit
A key on the keyboard
Click OK
Click the Power tab
‘b00100, ‘b10
File>Save
Press <Enter>, <F1>
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
A variable argument
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
file.o, where file can be
any valid filename
A hexadecimal number where 0xFFFF, 0x007A
n is a hexadecimal digit
Optional arguments
mcc18 [options] file
[options]
Choice of mutually exclusive errorlevel {0|1}
arguments; an OR selection
RECOMMENDED READING
This user's guide describes how to use MCP1630 Automotive Input Triple Output Converter Demo Board. The following Microchip documents are available on our web site
(www.microchip.com) 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.
PIC12F683 Data Sheet, "8-Pin Flash-Based, 8-Bit CMOS Microcontrollers with
Nano Watt Technology" (DS41211)
This data sheet provides detailed information regarding the PIC12F683 product family
DS51627A-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
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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 A (September 2006)
• Initial Release of this Document.
© 2006 Microchip Technology Inc.
DS51627A-page 3
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
NOTES:
DS51627A-page 4
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
The proliferation of distributed power supplies is expected to accelerate their use in
future generation cars and continue to incorporate increasingly complex electronic
systems. Distributed power supplies or "point-of-load" power supplies are being used
increasingly through out. These power supply units (PSUs) are responsible for
stepping up (or down) the input bus voltage, to power a multitude of electronic
subsystems. Examples of these electronic systems are collision avoidance radar,
adaptive cruise control, tire pressure monitoring, navigation systems, hands-free
cellular phones, and other wireless connectivity.
The majority of mid- to high-end automobiles produced today come with a DVD-based
GPS navigation system as standard equipment. However, designing a power supply to
handle all the different voltage rails within such a system can prove to be as complex
as designing the power-supply system for a notebook PC. The 5V and 3.3V rails are
typically the system bus. The 1.5V and 1.2V rails are used to power the CPU and
DSP-core voltages, respectively. The power levels of these two rails are usually
between 3W and 5W each.
Automotive subsystems with their inherent high voltage transients and high efficiency
requirements place increasing demands on power supply designs. These supplies
must provide high power, high efficiency and low noise from a very compact footprint
and must maintain a high efficiency over a wide range of operational input voltages.
The MCP1630/MCP1630V High-Speed, Microcontroller-Adaptable Pulse Width
Modulator is capable of maintaining output regulation with no adverse effects on system performance or reliability. The MCP1630 Automotive Input Triple Output Converter
Demo Board provides a better choice for automotive application design and providing
high efficiency and also providing a tight Line, Load and Cross regulation for the three
outputs.
This chapter covers the following topics.
• What is the MCP1630 Automotive Input Triple Output Converter Demo Board?
• What the MCP1630 Automotive Input Triple Output Converter Demo Board Kit
includes.
Input
Voltage
6.5V to 40V
Voltage
Regulator
MCP1630/V HighSpeed, Microcontroller Adaptable, Pulse width
Modulator
PIC12F683 for Osc Pulses, Reference
Voltage and ON/OFF Control
FIGURE 1-1:
Block Diagram.
© 2006 Microchip Technology Inc.
Feedback
Loop
SEPIC
Converter
Load
3.3V/1.2AV
1.2V/600 mA
4.7V/150 mA
MCP1630 Automotive Input Triple Output Converter Demo Board
DS51627A-page 5
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
1.2
WHAT IS THE MCP1630 AUTOMOTIVE INPUT TRIPLE OUTPUT CONVERTER
DEMO BOARD?
The MCP1630 Automotive Input Triple Output Converter Demo Board demonstrates
the use of a SEPIC topology for Automotive applications. The board also serves as a
platform to evaluate the MCP1630 device.
The MCP1630 inputs were developed to be easily attached to the I/O of a MCU. The
MCU supplies the oscillator pulses and reference voltage (VREF) to the MCP1630 to
provide the most flexible and adaptable power system. The power system switching
frequency and maximum duty cycle are set using the I/O of the MCU. The reference
input to high speed PWM can be external, a D/A Converter (DCA) output or as simple
as an I/O output from the MCU. This enables the power system to adapt to, many
external signals and variables in order to optimize performance and facilitate
calibration.
This board utilizes Microchip's MCP1630 (High-Speed, Microcontroller-Adaptable,
PWM MSOP8) integrated with PIC12F683 (Flash MCU SOIC8) in automotive
application. Under normal operation, the supply lines can range between 6.5V - 40V.
The converter is capable of delivering three different output voltages of 3.3V at 1.2A
load current, 1.2V at 600 mA load current and 4.7V at 150 mA load current, respectively. The Line regulation, Load regulation and Cross regulation is within ± 5% on
VOUT1, ± 5% on VOUT2 and ± 10% on VOUT3 for the variation in load from 50% to 100%.
1.3
WHAT THE MCP1630 AUTOMOTIVE INPUT TRIPLE OUTPUT CONVERTER
DEMO BOARD KIT INCLUDES
This MCP1630 Automotive Input Triple Output Converter Demo Board Kit includes:
• MCP1630 Automotive Input Triple Output Converter Demo Board (102-00067)
• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)
- MCP1630 Automotive Input Triple Output Converter Demo Board User’s
Guide (DS51627)
DS51627A-page 6
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP1630 Automotive Input Triple Output Converter Demo Board demonstrates
Microchip's high speed pulse width modulator (PWM) used for Automotive application.
When used in conjunction with a microcontroller, the MCP1630 will control the power
system duty cycle to provide regulated output voltage. The PIC12F683 microcontroller
is used to provide oscillator pulses at switching frequency of 250 kHz and set maximum
duty cycle. The MCP1630 generates duty cycle based on various external inputs.
External signals include the input oscillator pulses from PIC12F683, the reference
voltage and the feed back voltage. The output signal is a square-wave pulse given to
drive the MOSFET.
The PIC12F683 microcontroller is programmable, allowing the user to modify or
develop their own firmware routines to further evaluate the MCP1630 in this
application.
2.2
FEATURES
The MCP1630 Automotive Input Triple Output Converter Demo Board has the following
features:
•
•
•
•
•
•
•
•
Compact size for a Triple output Converter
Wide Input voltage range from 6.5V to 40V
Programmable output voltage and ON/OFF control using the PIC microcontroller
Provide line regulation, load regulation and cross regulation of ± 5% on VOUT1
(3.3V), ± 5% on VOUT2 (1.2V) and ± 10% on VOUT3 (4.7V) for load variation from
50% to 100%
High efficiency over entire operating input voltage range
PIC12F683 is used to generate reference Voltage and Oscillator signal at 250 kHz
frequency at maximum duty cycle
Proprietary features can be added by modifying the firmware contained in the
PIC12F683
Factory programmed source code is available
© 2006 Microchip Technology Inc.
DS51627A-page 7
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
2.3
GETTING STARTED
The MCP1630 Automotive Input Triple Output Converter Demo Board is fully
assembled and tested for Automotive Input. The board requires the use of an external
input voltage source (+6.5V to 40V) and external load for three outputs.
2.3.1
Power Input and Output Connection
2.3.1.1
POWERING THE MCP1630 AUTOMOTIVE INPUT TRIPLE OUTPUT
CONVERTER DEMO BOARD
1. Connect the positive side of the input source (+) to TP2. Connect the negative or
return side (-) of input source to TP1 Refer to figure 2-1. The input voltage should
be limited from 6.5V to 40V range.As the input voltage is applied and the system
powers up, the firmware program of the PIC12F683 device will initialize and help
the converter remain in low-power sleep mode (<0.1 uA) until the SW1 push
button is pressed by the user.
2. Once the SW1 push button is pressed, the MCP1630 Automotive Input Triple
Output Converter Demo Board is powered on delivering the three output voltages of 3.3V at 1.2A (Maximum current), 1.2V at 600 mA (Maximum current) and
4.7V at 150 mA (Maximum current) respectively.
3. Again, a subsequent pressing of the SW1 push button during normal operation
of the MCP1630 Automotive Input Triple Output Converter Demo Board will
power-off the converter.
GND
+Vout3
TP5
TP6
GND
T1
D3
D2
C15
TP8
C14
C9
D4
TP7
1
TP2
+Vin
+Vout2
Q2
CPROV
C1
L2
TP1
D1
TP4
GND
C2
1
C6
C5
U1
R5
U2
R3 R18
1
C13
R14 R15
D8
U3
R16
R13
C18
C10
GND
BOARD
C12 C8 C7 R1
TP3
R8
C16
R2 R10
C11
R9
C4 C3
R7
R6
1
R4
Q1
+Vout1
SW1
J1
R17
102-00067
MCP1630 Automotive Input Triple Output Converter
FIGURE 2-1:
DS51627A-page 8
Setup Configuration Diagram.
© 2006 Microchip Technology Inc.
Installation and Operation
2.3.1.2
APPLYING LOAD TO MCP1630 AUTOMOTIVE INPUT TRIPLE OUTPUT
CONVERTER DEMO BOARD
A variable resistive load can be used to verify the line regulation, load regulation and
cross regulation. The load resistance for the three outputs can be connected
accordingly. Note that the currents should not exceed the maximum current limit of
individual outputs i.e: 1.2A (maximum) for VOUT1, 600 mA (maximum) for VOUT2 and
150 mA (maximum) for VOUT3, respectively. The load resistance is connected between
the test points TP3 and TP4 for VOUT1, between test points TP7 and TP8 for VOUT2 and
between test points TP5 and TP6 for VOUT3. To measure the output voltage, connect
the common point of multimeter to TP3 and the positive terminal to TP4 for VOUT1. Similarly, to measure the output voltages of VOUT2 and VOUT3, connect the common point
of multimeter to TP8 for VOUT2 and TP6 for VOUT3 and the positive terminal to TP7 for
VOUT2 and TP5 for VOUT3.
The load regulation and cross regulation can be verified by varying the load from 50%
to 100%, with different combination of loads on all the outputs. Similarly, by varying the
line voltage from 6.5V to 40V and checking the output voltage, the line regulation can
be calculated.
Evaluating the Application
The best way to evaluate the MCP1630 Automotive Input Triple Output Converter
Demo Board is to dig into the circuit. Measure voltages and currents with a DVM and
probe the board with an oscilloscope.
The firmware program in the PIC12F683 can also be edited to modify the operation of
the application.
Firmware
The PIC12F683 comes pre programmed with firmware to operate the system as
described above. The file listing and firmware flow diagram are shown in Appendix
C. “Demo Board Firmware”.
The program is fairly simple and straight forward. There is an initialization routine at the
beginning of the program.
The internal oscillator clock is set to 8 MHz.The TRISIO is configured to set GP2
(Oscillator pulses to the MCP1630) and GP4 (VREF Voltage to MCP1630) as an output
port and GP3 (Switch SW1) as Input Port.The OPTION register is configured to
wake-up on Port pin change of GP3.
The Capture/Compare/PWM (CCP) module contains a 16-bit register which can
operate in PWM mode. The PWM period can be calculated by writing to the PR2
register. The PWM duty cycle is specified by writing to the CCPR1L register and to the
CCP1CON <5:4> bits. Up to 10-bit resolution is available. The CCPR1L contains the
eight MSbs and the CCP1CON <5:4> contains the two LSbs. This 10-bit value is
represented by CCPR1L:CCP1CON<5:4>. The switching frequency is set to 250 kHz.
Upon powering on, the processor enters into SLEEP mode after the ports are initialized
and registers configured. The processor wakes-up from SLEEP mode, if the Switch
SW1 on GP3 is pressed.
Once the processor is on after the switch SW1 is pressed, the three output voltages of
3.3V, 1.2V and 4.7V are generated by set by generating VREF voltage and the PWM
signal. TMR0 is configured to generate the VREF voltage.
During normal operation, a subsequent pressing of switch SW1 will make the converter
to go into SLEEP mode.
The switch SW1 is used to perform a simple ON/OFF operation.
© 2006 Microchip Technology Inc.
DS51627A-page 9
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
Programming
Header J1 is provided for in-circuit programming. This is an optional feature since the
demo board comes preprogrammed with firmware to operate the system. The
PIC12F683 can be reprogrammed with the Baseline Flash Microcontroller Programmer
(BFMP)
DS51627A-page 10
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP1630 Automotive Input Triple Output Converter Demo Board:
•
•
•
•
Board – Schematic
Board – Top Silk Layer
Board – Top Metal Layer
Board – Bottom Metal Layer
© 2006 Microchip Technology Inc.
DS51627A-page 11
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
BOARD – SCHEMATIC
3
2
3
1
2
1
M
A.2
DS51627A-page 12
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.3
BOARD – TOP SILK LAYER
BOARD
© 2006 Microchip Technology Inc.
DS51627A-page 13
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
A.4
BOARD – TOP METAL LAYER
DS51627A-page 14
© 2006 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD – BOTTOM METAL LAYER
© 2006 Microchip Technology Inc.
DS51627A-page 15
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
NOTES:
DS51627A-page 16
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
2
BILL OF MATERIALS (BOM)
Reference
C1,C17
Description
Manufacturer
DNP
—
Cap 10UF 50V Ceramic F 1210
Panasonic®
Part Number
—
2
C2, C5
5
C3, C4, C9,C14, Cap 10UF 6.3V Ceramic X5R 0805
C15
Panasonic - ECG
ECJ-2FB0J106M
2
C6, C16
Cap 1UF 10V Ceramic 0603 X5R
Panasonic - ECG
ECJ-1VB1A105K
1
C7
Cap Ceramic 47PF 50V 0603 SMD
Panasonic - ECG
ECJ-1VC1H470J
1
C8
Cap Ceramic 1000PF 50V NP0 0603
Panasonic - ECG
ECJ-1VC1H102J
1
C10
Cap .1UF 50V Ceramic Y5V 0603
Panasonic - ECG
ECJ-1VF1H104Z
1
C11
Cap Ceramic 22PF 50V 0603 SMD
Panasonic - ECG
ECJ-1VC1H220J
2
C12, C18
Cap .10UF 10V Ceramic X7R 0603
Kemet® Electronics Corp
C0603C104K8RACTU
1
C13
Cap 10UF 10V Ceramic 1206 X5R
Panasonic - ECG
ECJ-3YB1A106M
1
CPROV
Cap Cer 1UF 50V X7R 10% 1206
TDK Corporation
C3216X7R1H105K
2
D1, D4
Diode Schottky 30V 3A SMA
Diodes Inc
B330A-13
2
D2,D5
DNP
1
D3
Diode Schottky 60V 1A SMA
Diodes Inc
B160-13
1
D6
Diode Zener Dual CA 18V SOT-23
Diodes Inc
AZ23C18-7
1
D7
Diode Zener 350MW 6.2V SOT23
Diodes Inc
BZX84C6V2-7-F
Lumex®
- ECG
ECJ-4YF1H106Z
1
D8
LED 660NM Super Red Diff 0603SMD
/ Opto
Components Inc
SML-LX0603SRW-TR
1
J1
Conn Mod Jack 6-6 R/A PCB 50AU
Tyco® Electronics/Amp
555165-1
1
L2
Inductor Shield PWR 15UH SMD
Coiltronics/Div of
Cooper/Bussmann
DR74-150-R
1
Q1
MOSFET N-CH 60V 2.5A SOT-23-6
Zetex Inc
ZXMN6A08E6TA
1
Q2
MOSFET N-CH 20V 6A 8-MSOP
Zetex Inc
ZXMN2A02X8TA
3
R1, R2, R3
Res 30.1K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF3012V
1
R4
RES 14.7K Ohm 1/10W 1% 0603
SMD
Panasonic - ECG
ERJ-3EKF1472V
4
R5, R6, R9, R16 Res 2.00K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF2001V
2
R7,R8
Res 0.22 Ohm 1/4W 1% 1206 SMD
Panasonic - ECG
ERJ-8RQFR22V
1
R10
Res 10.0 Ohm 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF10R0V
3
R11, R12, R15
DNP
—
—
1
R13
Res 8.06K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF8061V
1
R14
Res 78.7K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF7872V
1
R17
Res 47.5K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF4752V
1
R18
Res 4.99K Ohm 1/10W 1% 0603 SMD Panasonic - ECG
ERJ-3EKF4991V
1
SW1
Switch Tact 6MM 260GF SMT
TL3301NF260QG
Note 1:
E-Switch
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.
© 2006 Microchip Technology Inc.
DS51627A-page 17
MCP1630 Automotive Input Triple Output Converter Demo Board User’s Guide
TABLE B-1:
Qty
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Description
Manufacturer
Part Number
®
8
TP1,TP2,TP3,T
P4,TP5,TP6,TP
7,TP8
PC Test point compact SMT
Keystone Electronics
1
T1
Inductor / Transformer 5.7uH SMD
Coiltronics/Div of
Cooper/Bussmann
1
U1
IC PWM HS MCU-Adaptable 8MSOP
Microchip Technology Inc MCP1630-E/MS
1
U2
IC Regulator Ultra -LO 5V 8-MSOP
National Semiconductor® LM2936MM-5.0
1
U3
IC MCU Flash 2KX14 8SOIC
Microchip Technology Inc PIC12F683-I/SNG
Note 1:
5016
VP2-0116-R
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.
DS51627A-page 18
© 2006 Microchip Technology Inc.
MCP1630 AUTOMOTIVE INPUT
TRIPLE OUTPUT CONVERTER
DEMO BOARD USER’S GUIDE
Appendix C. Demo Board Firmware
C.1
DEVICE FIRMWARE
For the latest version of the MCP1630 Automotive Input Triple Output Converter Demo
Board firmware, visit our web site at www.microchip.com.
START
Initialize Registers and Osc Clock to 8 MHz
Configure GPIO<3> as Input and Enable Port Change Interrupt for this Pin,
Configure GPIO<2,4> as Output Ports
Configure PWM.
A
Goto sleep mode
Check for Switch Press
Wake up from SLEEP
on Switch Press
No
Yes
Start the PWM Pulses at 250 kHz
Frequency
Start the Vref Signal
If Switch is pressed
No
Yes
A
FIGURE C-1:
© 2006 Microchip Technology Inc.
Firmware Flowchart.
DS51627A-page 19
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08/29/06
DS51627A-page 20
© 2006 Microchip Technology Inc.
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Authorized Distributor
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