MCP1630 Automotive Input Triple Output Converter Demo Board User's Guide (c) 2006 Microchip Technology Inc. DS51627A 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. 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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 (c) 2006 Microchip Technology Inc. DS51627A-page iii MCP1630 Automotive Input Triple Output Converter Demo Board User's Guide NOTES: DS51627A-page iv (c) 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(R) 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. (c) 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(R) 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 (c) 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 A (September 2006) * Initial Release of this Document. (c) 2006 Microchip Technology Inc. DS51627A-page 3 MCP1630 Automotive Input Triple Output Converter Demo Board User's Guide NOTES: DS51627A-page 4 (c) 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. (c) 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 (c) 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 (c) 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. (c) 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. (c) 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 (c) 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 (c) 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 (c) 2006 Microchip Technology Inc. Schematic and Layouts A.3 BOARD - TOP SILK LAYER BOARD (c) 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 (c) 2006 Microchip Technology Inc. Schematic and Layouts A.5 BOARD - BOTTOM METAL LAYER (c) 2006 Microchip Technology Inc. DS51627A-page 15 MCP1630 Automotive Input Triple Output Converter Demo Board User's Guide NOTES: DS51627A-page 16 (c) 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(R) 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(R) 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(R) - 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(R) 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. (c) 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 (R) 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(R) 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 (c) 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: (c) 2006 Microchip Technology Inc. Firmware Flowchart. 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