MCP3909
ADC Evaluation Board
for 16-Bit MCUs
User’s Guide
© 2008 Microchip Technology Inc.
DS51777A
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
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Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB,
SEEVAL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2008, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS51777A-page ii
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Introduction............................................................................................................ 1
Document Layout .................................................................................................. 1
Conventions Used in this Guide ............................................................................ 2
Recommended Reading........................................................................................ 3
The Microchip Web Site ........................................................................................ 3
Customer Support ................................................................................................. 3
Document Revision History ................................................................................... 3
Chapter 1. Hardware Description
1.1 Overview ........................................................................................................ 5
1.2 PIM Module / MCP3909 Connection and Peripheral Usage Overview .......... 7
1.3 MCP3909 Delta-Sigma Sampling / MCLK Options ........................................ 8
1.4 Analog Input Structure .................................................................................... 9
1.5 Universal Serial Bus (USB) ............................................................................ 9
Chapter 2. Firmware
2.1 DSPIC33 Firmware Description ................................................................... 11
2.2 Display Mode Control - SW2 ........................................................................ 13
2.3 Sampling Speed Rate Control - SW3 ........................................................... 13
2.4 Data Acquisition ........................................................................................... 13
2.5 Data Transmission ....................................................................................... 15
Chapter 3. MCP3909 PC Software Tool
3.1 Software Overview ....................................................................................... 17
3.2 Setting the Sample Rate .............................................................................. 18
3.3 Connectivity, Recording Length and Calibration of Data .............................. 18
3.4 Scope Plot Window - Time Domain Analysis ............................................... 18
3.5 Histogram Window - Noise Analysis ............................................................ 19
3.6 FFT Window - Frequency Domain Analysis ................................................. 19
3.7 Auxiliary Data Window ................................................................................. 19
© 2008 Microchip Technology Inc.
DS51777A-page iii
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
Appendix A. Schematics and Layouts
A.1 Introduction .................................................................................................. 21
A.2 Schematic - Analog ...................................................................................... 22
A.3 Schematic - LCD And UART ....................................................................... 23
A.4 Schematic - USB And Memory .................................................................... 24
A.5 Schematic - Microcontroller (MCU) .............................................................. 25
A.6 Schematic - PIM Module .............................................................................. 26
A.7 Schematic - Power ....................................................................................... 27
A.8 Board - Top Trace and Top Silk ................................................................... 28
A.9 Board - Bottom Trace and Bottom Silk ........................................................ 28
A.10 Board - Layer #2 VDD ................................................................................ 29
A.11 Board - Layer #3 GND ............................................................................... 29
A.12 Board -Top Silk and Pads .......................................................................... 30
A.13 Board - Bottom Silk and Pads .................................................................... 30
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service .....................................................................................34
DS51777A-page iv
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs 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
MCP3909 ADC Evaluation Board for 16-Bit MCUs. 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 MCP3909 ADC Evaluation Board for 16-Bit
MCUs as a development tool to emulate and debug firmware on a target board. The
manual layout is as follows:
• Chapter 1. “Hardware Description”– Provides important information about the
MCP3909 ADC Evaluation Board for 16-Bit MCUs hardware.
• Chapter 2. “Firmware”– Describes the MCP3909 ADC Evaluation Board for
16-Bit MCUs firmware.
• Chapter 3. “MCP3909 PC Software Tool” – Provides detailed information about
board’s PC software tool.
• Appendix A. “Schematics and Layouts”– Shows the schematic and board
layouts for the MCP3909 ADC Evaluation Board for 16-Bit MCUs.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP3909 ADC Evaluation Board for 16-Bit MCUs.
© 2008 Microchip Technology Inc.
DS51777A-page 1
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
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
#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}
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 code supplied by
user
DS51777A-page 2
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2008 Microchip Technology Inc.
Preface
RECOMMENDED READING
This user's guide describes how to use MCP3909 ADC Evaluation Board for 16-Bit
MCUs. Other useful documents are listed below. The following Microchip document is
available and recommended as supplemental reference resources:
• MCP3909 Data Sheet - “Energy Metering IC with SPI Interface and Active
Power Pulse Output” (DS22025)
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 2008)
• Initial Release of this Document.
© 2008 Microchip Technology Inc.
DS51777A-page 3
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
NOTES:
DS51777A-page 4
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Chapter 1. Hardware Description
1.1
OVERVIEW
The MCP3909 ADC Evaluation Board for 16-Bit MCUs system provides the ability to
evaluate the performance of the MCP3909 dual channel ADC. It also provides a development platform for 16-bit PIC based applications, using existing 100-pin PIM systems
compatible with the Explorer-16 and other high pincount PIC demo boards. The system
comes with programmed PIC24FJ128GA010 and dsPIC33FJ256GP710 PIM modules
that communicate both to on-board LCD and a LabView GUI for both in-circuit and PC
signal processing.
1.1.1
Feature Highlights
• Dual 16-bit ADC MCP3909 output display using Serial communication to
PC Software Interface
• Simultaneous 15 ksps at 81 dB SINAD performance on dual 16-Bit MCP3909
channels
• Spectral Analysis using DFT dsPIC33F calculations, resolution of TBDAH
• System and ADC performance analysis through graphical PC tools showing Noise
Histogram, Frequency Domain (FFT), Time domain scope plot, and statistical
numerical analysis
• Robust hardware design with analog grounding and analog/digital separation,
allowing low noise evaluation of MCP3909 devices. Separate power supplies and
power planes - 4 layer board
• Pigtail Plus connectors for Explorer-16 daughter board compatibility
© 2008 Microchip Technology Inc.
DS51777A-page 5
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
HFOUT
G
CH1+
GND
CH1-
+ MCP3909
G
-
+
-
EXT +5V
CH0+
GND
CH0-
+
-
Serial Connector
EXT +5V
+9V IN
USB
PIM RESET
MCP3909
Digital I/O
SW2
SW3
SW4
RA9
USB
+3V
REG
PWR LED
(Blue)
PIC18F86J65
PIC18 AUX I/O
SRAM
PICtail Plus
PIC18 ICD
PIC18 ICD
9V EXT. IN
+5V
REG
RA10
PIM (100-PIN)
PIC18 EXTERNAL I/O
MCP3909 ADC Evaluation Board for 16-bit MCU
FIGURE 1-1:
DS51777A-page 6
Evaluation Board Block Diagram.
© 2008 Microchip Technology Inc.
Hardware Description
1.2
PIM MODULE / MCP3909 CONNECTION AND PERIPHERAL USAGE
OVERVIEW
The MCP3909 ADC Evaluation Board for 16-Bit MCUs contains a 100-pin PIM socket
compatible with Microchip’s PIM modules. The system comes with 2 PIM modules: the
PIC24FJ128GA010 and dsPIC33FJ256GA710.
A complete description of the firmware programmed with these two modules see in
Chapter 1. “Hardware Description”.
RA9/10
D6 D7
RB8/9/10
(Green)
CONTROL SWITCHES (X3)
RF2/U1RX
UART SERIAL TO PC COMMUNICATION
RF3/U1TX
RD10
RD11
OC1/RD0
CLKIN
RA5
RA4
SCK1/RF6
SDO1/RF8
SDI1/RF7
T2CK/RC1
PIM Module
FIGURE 1-2:
MCLR
Clock
Generation
CS
SCK
SDI
G1
HPF
G0
HPF1
16-bit
Multi-level
ΔΣ ADC
+
PGA
‚
CH0+
CH0-
HPF1
16-bit
Multi-level
ΔΣ ADC
+
‚
CH1+
CH1-
Serial
Interface
Block
SDO
HFOUT
Digital to
Frequency
Converter
MCP3909
Digital Connection Overview PIM/MCP3909 connections.
Ports A, B, and D are used for signals such as push buttons, output LEDs, CS and
MCLR (for MCP3909 data mode setting). Output Capture 1 is used for MCP3909’s
clock generation. Serial communication is achieved through the MSSP module 1, and
the Timer2 Capture Compare can be used to measure MCP3909 active power output
frequency (HFOUT).
© 2008 Microchip Technology Inc.
DS51777A-page 7
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
1.3
MCP3909 DELTA-SIGMA SAMPLING / MCLK OPTIONS
The MCP3909 device is an ADC with a second order modulator and a third order sinc
filter. This Delta-Sigma A/D converter has an oversampling ratio of 64. The CLKIN pin
of the MCP3909 is the oversampling clock (MCLK) input and the output data rate is
MCLK/256. The MCP3909 ADC Evaluation Board for 16-Bit MCUs offers two different
options for the MCP3909 master clock (MCLK).
1.3.1
Using the Crystal X2
The MCP3909 ADC Evaluation Board for 16-Bit MCUs is populated with a 3.58 MHz
crystal, being used as a clock source by placing jumpers in the following position on the
MCP3909 Digital I/O header block:
XTAL
XTAL
PIM OC1
CLKOUT
CLKIN
CLKIN
FIGURE 1-3:
1.3.2
ADC Clock Selection Jumpers - External Crystal.
Driving the clock with the PIM module
The PIC MCU can be used to generate the CLKIN (MCLK) signal for the MCP3909,
setting the ADC sample rate through the use of the output compare module OC1. To
use this, make the following jumper change to the MCP3909 Digital I/O header block:
XTAL
XTAL
PIM OC1
CLKOUT
CLKIN
CLKIN
FIGURE 1-4:
ADC Clock Selection Jumpers - Clock from MCU.
The frequency of the OC1 output is based on the PR1 bits settings in the firmware
(for both PIC24 and dsPIC33 PIM modules supplied with this system). These settings
can be cycled through by pressing SW2 of the PIM AUX Switches. The Table 1-1
shows the settings that are immediately available by changing PR2, the timer period
register:
TABLE 1-1:
DS51777A-page 8
SAMPLE RATES
Gear
PR Bit Setting
OC1 Frequency
MCP3909 Data Rate
1
48
164.96 kHz
644.2 sps
2
14
758.7 kHz
2.96 ksps
3
8
1264.36 kHz
4.94 ksps
4
4
2.2755 MHz
8.89 ksps
5
2
3.7921 MHz
14.81 ksps
© 2008 Microchip Technology Inc.
Hardware Description
1.4
ANALOG INPUT STRUCTURE
Two differential input paths allow external signal sources to be easily connected to the
MCP3909 input. Edge connectors P1 and P2 are 3-pin connectors that act as both
crew type and clip on post connectors.
Note:
To use an edge connector as a post connector, pull up the blue plastic top
to access posts.
JP1 and JP2 can be used to force either channel from a differential to single-ended
configuration. R3 and R4 (on CH0), and R1 and R2 (on CH2) act as locations for
burden resistor connectors for any current transformer inputs.
1.5
UNIVERSAL SERIAL BUS (USB)
The MCP3909 ADC Evaluation Board for 16-Bit MCUs also contains a USB connection
for higher speed sampling and data collection. The circuit includes a 512 x 8 SRAM for
data collection. The following figure summarizes the connections between the ADC, 2
micros, and memory.
Note:
For this board release, no USB firmware is supplied. The PIC18F86J55 is
blank and only included for development purposes.
SRAM
512x8
USB
PIC18F86J55
8
RD6/SCK2
© 2008 Microchip Technology Inc.
SCK2/RG6
MCP3909
ADC
RF6/SCK1
SCK
RD4/SDO2
SDI2/RG7
RF7/SDI1
SDO
RD5/SDI2
SDO2/RG8
RF8/SDO1
SDI
RD7/SS2
SS2/RG9
USB
FIGURE 1-5:
PIM
Module
SERIAL
USB Block Diagram.
DS51777A-page 9
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
NOTES:
DS51777A-page 10
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Chapter 2. Firmware
2.1
DSPIC33 FIRMWARE DESCRIPTION
2.1.1
Reset and Initialization
After reset, the code jumps to line 305 from main.c file, where the initialization routine
is called: Initialization(). First, the nested interrupts are disabled. External
interrupt 3 is enabled on the negative edge. Timer 2 is running on the Output
Compare 1, being used to generate the clock for the MCP3909. In addition, some initial
values are set up for the MCP3909 clock frequency.
Timer 5 is enabled and set to generate an interrupt at compare mach; the time period
between two interrupts is a few hundred milliseconds.
Note:
The time period can be changed from PR5 register.
The SPI module is initialized and started, but the corresponding interrupt is not
enabled. UART transmitter is initialized, but the corresponding interrupt is not enabled.
Communication speed is set for 115200 baud. The UART receiver is not used.
Pins with analogue alternate function are setup as digital-input outputs. Initial values
for different variables are being set at the end of the initialization routine.
Back in the void main() routine the nested interrupts are enabled. Then the routine
that starts the MCP3909 is called: startMCP3909().
2.1.2
startMCP3909()
During this routine the MCP3909 is put into a test mode, according to the MCP3909
data sheet. At the beginning CS and MCP3909 reset pins (MCLR) have high values.
After a slight delay, MCLR is toggled low, and then the serial command b10100100 is
sent to the device. This means that the ADC is placed into “Dual Channel Output PRE
HPF1” mode. Then, a short positive pulse is sent to CS.
2.1.3
Main()
In the main() file, the LCD will display the samples values.
At this point, the Main routine will enter an infinite loop. All the other tasks are being
done during the interrupt routines.
2.1.4
Timer 5 Compare Mach Interrupt
All events that don't need to take place to a repeated, constant period of time are
processed during this interrupt. One event that is happening at the time of this routine
is the blinking of LED D7 - as a life sign for the system. This routine is monitoring the
buttons state (pressed or not pressed), and also counts how many times each of them
have been pressed.
© 2008 Microchip Technology Inc.
DS51777A-page 11
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
START
Initialization
LCD: “Samples Value”
SW2 pressed?
NO
YES
Adjust value of: But1Cont
SW2 pressed
once
YES
Copy CH0 samples in signal[] buffer;
Compute FFT;
Indicate on LCD FFT results: magnitude
and frequency;
NO
SW2 pressed
twice
YES
Copy CH1 samples in signal[] buffer;
Compute FFT;
Indicate on LCD FFT results: magnitude
and frequency;
NO
SW2 pressed
3rd time
YES
Copy CH0 samples in signal[] buffer;
Compute Autocorrelation function;
Indicate on the LCD the signal frequency
and the index of maximum value
NO
SW3 pressed?
YES
Adjust value of: But2Cont
NO
SW3 pressed
once
YES
Set sampling speed: gear 1
NO
SW3 pressed
twice
YES
Set sampling speed: gear 2
NO
SW3 pressed
3rd time
YES
Set sampling speed: gear 3
NO
SW3 pressed
4th time
YES
Set sampling speed: gear 4
NO
SW3 pressed
5th time
YES
Set sampling speed: gear 5
NO
FIGURE 2-1:
DS51777A-page 12
LCD Control Flowchart.
© 2008 Microchip Technology Inc.
Firmware
2.2
DISPLAY MODE CONTROL - SW2
Table 2-1 describes the actions made to the SW2 button, and the results shown on the
LCD.
TABLE 2-1:
LCD MESSAGE DURING SW2 MANIPULATION
Type of Operation
NEVER PRESSED
LCD indicates the same message as the one during the reset
time: samples values.
1st Time
LCD shows the results of the FFT performed on CH0.
2nd
LCD shows the results of the FFT performed on samples
recorded from CH1.
Time
3rd Time
2.3
LCD Screen Results
LCD indicates the results form the auto-correlation function:
signal frequency and the index of maximum of the
auto-correlation function.
SAMPLING SPEED RATE CONTROL - SW3
SW3 button is used to control the sampling speed rate of the ADC by changing the
frequency of the MCP3909 clock signal.
The initial sampling frequency rate is around 640 sps. For a 64 sample buffer it means
a 0.1s recording buffer.
Table indicates estimated values for the sampling frequency when operating the SW3
button:
TABLE 2-2:
RESULTS DURING SW3 MANIPULATION
Type of Operation
Pressed
1st
time
Pressed
2nd
Sampling Frequency Rate Estimation
The sampling speed rate is to 2000 sps.
time
The sampling frequency rate is 3800 sps.
Pressed 3rd time
The sampling frequency rate is 7600 sps.
Pressed 4th time
The sampling speed rate is 15000 sps.
These higher sampling rates can be used when the measured signal has a high
frequency, or when a signal doesn't have a stable frequency and we want to measure
its amplitude. For higher sampling rate the measurement error induced by the Sinc filter
is reduced.
Note:
2.4
Important! When using the GUI for evaluation, the ‘gear’ on the GUI must
be set to the speed on the board, i.e. 1st, 2nd, 3rd, etc.
DATA ACQUISITION
External interrupt 3 is used for detecting the end of conversion on MCP3909. Because
this line is the same with the SPI data output, the first thing done after the detection of
an external interrupt is to disable this particular interrupt. Otherwise an interrupt will be
generated on each falling edges of the SPI signal.
Then the setup for the SPI is changed: it will be used in 16-bit mode, and the interrupt
is activated. The SPIBUF register is being read to clear the SPI interrupt flag. For the
first 16 periods of SPI clock, 0 value will be send to the MCP3909.
The SPI interrupt takes place after each successful data transfer between master and
slave on SPI. As in any interrupt, first thing to do is to clear the interrupt flag, otherwise
a new interrupt will happen again, for no reason.
© 2008 Microchip Technology Inc.
DS51777A-page 13
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
The CCSPI global value is the counter that indicates if the SPI happens soon after the
INT3, and the value present in the SPI is CH0, or if a previous SPI interrupt happened
and now is time to save value of CH1. After saving the samples into MCU, a small pulse
is sent on CS, to the MCP3909, to prepare it for a new conversion. The acquired data
is saved in form of two vectors in SRAM, one for CH0 and ne for CH1.
Finally, the Timer 5 interrupt and UART TX interrupt are enabled. The first Character
sent to UARt is:!.
External Interrupt 3
Disable INT3;
Set SPI on 16 bit Mode;
Enable SPI;
ccspi=0?
NO
YES
Read CH0;
Save word;
Increment ccspi;
ccspi=1?
YES
Read CH1;
Save word;
Increment ccspi;
NO
ccspi=2;
YES
Disable SPI interrupt;
Enable INT3;
ccspi=0;
Save data in buffer
Buffer Full?
YES
Enable timer 5
interrupt;
Enable UART TX
interrupt;
Sent char 0d33;
FIGURE 2-2:
DS51777A-page 14
ADC Communication Flowchart.
© 2008 Microchip Technology Inc.
Firmware
2.5
DATA TRANSMISSION
When UART TX interrupt takes place, data is extracted from SRAM as a 16-bit number,
then translated into STRING. Each word is converted into a five digit number without
sign.
During transmission, the digits with the values of CH0 are sent first, then the
character ‘,’. Next are the five digits of the CH1, and last, the character Carriage
return. This is done 512 times.
After the transmission of the acquired samples, the FFT value must be sent on UART.
To delimit the buffer of the acquired samples from FFT values, character ‘;’ is being
sent.
The FFT information is sent in the same manner as the stored samples (five digit
numbers delimited by ‘,’ and CR), but the FFT length is limited to 128 values. These
values are used by the GUI to compare the FFT computed into the MCU to the one
computed on the PC.
UART TX Interrupt
contrd<=511
NO
YES
Get CH0 from buffer;
Change INT into 5 digit string;
Sent the 5 characters;
Sent character: ,
Get CH1 from Buffer;
Change the value in 5 digit string;
Sent the 5 characters;
Sent character Carriage Return
Increment contrd;
FIGURE 2-3:
contrd<=512+FFT
length?
NO
YES
Get Voltage FFT value;
Change value into 5 digit string;
Sent the 5 characters;
Sent character: ,
Get Current FFT value;
Change the value in 5 digit string;
Sent the 5 characters;
Sent character Carriage Return
Increment contrd;
UART TX disable;
contwr=0;
Serial Transmission Flowchart.
© 2008 Microchip Technology Inc.
DS51777A-page 15
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
NOTES:
DS51777A-page 16
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Chapter 3. MCP3909 PC Software Tool
3.1
SOFTWARE OVERVIEW
The MCP3909 ADC Evaluation Board for 16-Bit MCUs includes a PC graphical user
interface (GUI) that performs data analysis for easier system debugging and device
evaluation. The following figure a sample of the software’s GUI.
FIGURE 3-1:
Data View Interface.
© 2008 Microchip Technology Inc.
DS51777A-page 17
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
3.2
SETTING THE SAMPLE RATE
On the MCP3909 ADC Evaluation Board for 16-Bit MCUs is possible to select from five
different sampling rates, referred here as gears. The control is placed in the up left
areas of the GUI.
The value of the sampling rate for each gear is as follows:
•
•
•
•
•
1st gear
2nd gear
3th gear
4th gear
5th gear
- 644.2 sps
- 2963 sps
- 4938 sps
- 8888 sps
- 14813 sps
Once the gear is changed, the actualized value of the sampling rate is indicated on the
“Sampling Frequency (sps)” field. The “Frequency Resolution” field will indicate the
space between spectral lines of the sampled signal, at the indicated sample rate.
Changing the sampling rate in the GUI will not automatically change the one on the
MCP3909 ADC Evaluation Board for 16-Bit MCUs. For this to happen it is necessary
to manually change the gear, by pressing the RB9 button placed on the board.
3.3
CONNECTIVITY, RECORDING LENGTH AND CALIBRATION OF DATA
The PC is connected to the MCP3909 ADC Evaluation Board for 16-Bit MCUs through
the RS232 cable. It is important to have a COM port on the PC. It is possible to use a
USB to RS232 adaptor cable, for this case being necessary to write the number of the
virtual COM port. To do this, right-click on My computer > Manage > Device Manager
> Port (COM and LPT), and read the number in the parenthesis, after the device name.
The COM port number must be selected in the “VISA Resource Name” field.
The MCU is sending a big packet of data to the PC. If the user need to see only to a
small part of the buffer, he will write the desired buffer length in the “Buffer length” field.
The maximum length is 512 samples.
The user have the option to choose between Calibrate and Not Calibrate tab from the
up-right corner of the window. The calibration is possible for an AC signal
measurement, calibrating the scale and selecting the desired unit of measure for the
processed data.
When selecting the Calibrate tab, two fields are shown: the “Amplitude CH0” and the
“Amplitude CH1”, with the corresponding Calibration buttons. The user must write the
peak-to-peak value in the two fields, and then press the Calibration button for each,
or use the shortcuts (<F2> for CH0 and <F3> for CH1). If the Calibration button is not
pressed, or the shortcut is not applied, plot screens will be empty.
If the Not Calibrated tab is selected, the “Amplitude” fields and Calibration buttons are
not visible, and the data plotted on the screen will be indicated in LSBs (in ADC code).
To stop the GUI it is necessary to press the STOP button, or the <F4> shortcut key.
3.4
SCOPE PLOT WINDOW - TIME DOMAIN ANALYSIS
The recorded samples from a buffer are indicated on the “Waveform Graphs” screens.
The size of the X scale is given by the number showed in the “Buffer Length” field.
If the Not Calibrated tab is selected, the value on Y axis will be given by the LSBs. If
the data is calibrated, and calibration value is 0.5, for example, the data on the
waveform graphs will have an amplitude peak-to-peak of 2x0.5. It is important to note
that the offset is not removed.
DS51777A-page 18
© 2008 Microchip Technology Inc.
MCP3909 PC Software Tool
3.5
HISTOGRAM WINDOW - NOISE ANALYSIS
For the evaluation of the Effective Number Of Bits (ENOB) the GUI will compute some
statistical parameters: “mean” value, “standard deviation” and “variance”, for each
channel. These parameters can be seen at the bottom of the GUI, right under the
Histogram Graph screens. The formula used for the ENOB is:
EQUATION 3-1:
ENOB = 16 – log 2 ( σ )
The right value for the acquired ENOB is correct only when the DC signal is applied on
the inputs.
The distribution of noise from the acquired signal can be seen on the Histogram Graph
screens.These graphs are indicating how many transitions took place in between two
codes. In the case of a noiseless signal (a straight line), the histogram graphs will show
nothing. If the signal is a digital noise signal (transition between two values) the
histogram will indicate just one vertical bar.
3.6
FFT WINDOW - FREQUENCY DOMAIN ANALYSIS
The spectrum of the acquired signal is visible in the Signal Spectrum screen. Above
these graphics there is a button that can be used to set the Y scale to be linear or
logarithmic. A logarithmic scale on Y axis is useful to see the level of low harmonics, or
the noise floor.
The length of the FFT is given by the buffer length and the sampling speed. The X axis
is directly scaled in Hz units. Do remember when changing the sampling speed in the
GUI, to manually change the sampling speed on the MCP3909 ADC Evaluation Board
for 16-Bit MCUs.
Another feature of the software is the window selection for the FFT computation. This
is done from the “Window” fields, in the lower region of the GUI, right above the
Current FFT screens. The user can select from a large number of windows.
Since GUI is performing the spectral analysis of the acquired signal, it is possible to
compute AC performance parameters of the ADC: “THD” and “SINAD” are shown on
the indicators, right under the Histogram Graph screens.
3.7
AUXILIARY DATA WINDOW
At the bottom of the GUI there are two screens called Current FFT and Voltage FFT.
These graphics are used to compare the FFT computed on the MCU (the green FFT)
with the one computed on the PC (the red FFT). The Current channel is CH0, and the
Voltage channel is CH1.
In the beginning these graphs do not indicate anything. For a correct use it is necessary
to have the same window used on both MCU and PC. In addition, on the PC, the Linear
scale for the FFT must be used.
Because on the MCU the FFT has 128 points in length, the buffer length should be the
same.
The MCU is not sending the data to the PC simultaneously. To choose which view to
see (Current FFT or Voltage FFT), press SW3 placed on the board.
© 2008 Microchip Technology Inc.
DS51777A-page 19
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
NOTES:
DS51777A-page 20
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Appendix A. Schematics and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics of the MCP3909 ADC Evaluation
Board for 16-Bit MCUs.
•
•
•
•
•
•
•
•
•
•
•
•
Schematic - Analog
Schematic - LCD and UART
Schematic - USB and Memory
Schematic - Microcontroller (MCU)
Schematic - PIM Module
Schematic - Power
Board - Top Trace and Top Silk
Board - Bottom Trace and Bottom Silk
Board - Layer #2 VDD
Board - Layer #3 GND
Board - Top Silk and Pads
Board - Bottom Silk and Pads
© 2008 Microchip Technology Inc.
DS51777A-page 21
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
SCHEMATIC - ANALOG
Lynium
A.2
DS51777A-page 22
© 2008 Microchip Technology Inc.
Schematics and Layouts
SCHEMATIC - LCD AND UART
Lynium
A.3
© 2008 Microchip Technology Inc.
DS51777A-page 23
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
SCHEMATIC - USB AND MEMORY
Lynium
A.4
DS51777A-page 24
© 2008 Microchip Technology Inc.
Schematics and Layouts
SCHEMATIC - MICROCONTROLLER (MCU)
Lynium
A.5
© 2008 Microchip Technology Inc.
DS51777A-page 25
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
SCHEMATIC - PIM MODULE
Lynium
A.6
DS51777A-page 26
© 2008 Microchip Technology Inc.
Schematics and Layouts
SCHEMATIC - POWER
Lynium
A.7
© 2008 Microchip Technology Inc.
DS51777A-page 27
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
A.8
BOARD - TOP TRACE AND TOP SILK
MCP3909 ADC Eval Board for 16-bit MCU
A.9
BOARD - BOTTOM TRACE AND BOTTOM SILK
DS51777A-page 28
© 2008 Microchip Technology Inc.
Schematics and Layouts
A.10 BOARD - LAYER #2 VDD
A.11 BOARD - LAYER #3 GND
© 2008 Microchip Technology Inc.
DS51777A-page 29
MCP3909 ADC Evaluation Board for 16-Bit MCUs User’s Guide
A.12 BOARD -TOP SILK AND PADS
MCP3909 ADC Eval Board for 16-bit MCU
A.13 BOARD - BOTTOM SILK AND PADS
DS51777A-page 30
© 2008 Microchip Technology Inc.
MCP3909 ADC EVALUATION BOARD
FOR 16-BIT MCUs USER’S GUIDE
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
2
C1, C4
CAP CER 10UF 16V X5R 0805
Murata Electronics®
GRM21BR61C106KE15L
2
C2, C6
CAP CER 4.7UF 25V X5R 0805
Murata Electronics
GRM21BR61E475KA12L
5
C3, C5, C44, C45, CAP CER .1UF 25V 10% X7R 0805
C46
Murata Electronics
GRM21BR71E104KA01L
4
C7, C8, C9, C10
CAP CER 68000PF 50V C0G 1206
Murata Electronics
GRM31C5C1H683JA01L
1
C23
CAPACITOR TANT 47UF 6.3V 20% SMD
Kemet Electronics®
T491A476M006AT
30
C11, C12, C13,
C14, C15, C16,
C17, C18, C19,
C20, C21, C22,
C24, C25, C26,
C27, C28, C29,
C30, C33, C34,
C35, C36, C39,
C40, C43, C47,
C48, C49, C50
CAP CER .1UF 25V 10% X7R 0603
Murata Electronics
GRM188R71E104KA01D
6
C31, C32, C37,
C38, C41, C42
CAP CER 18PF 50V 5% C0G 0603
Murata Electronics
GRM1885C1H180JA01D
2
D1, D6
LED 570NM GRN WHT/DIFF 0603 SMD
Rohm
3
D2, D4, D7
LED RED 470NM CLEAR LENS (0603 Red) PARA Light
1
D3
DIODE SCHOTTKY 20V 0.5A SOD123
ON Semiconductor®
MBR0520LT1G
1
D5
LED BLUE 470NM CLEAR LENS (0603
Blue)
PARA Light
L-C191LBCT-U1
1
J1
CONN POWERJACK MINI .08" R/A T/H
Switchcraft Inc.
RAPC722X
1
J2
Mini USB Type B Surface Mount
Samtec
MUSB-05-S-B-SM-A
®
SML-512MWT86
L-C192KRCT-U1
1
J3
CONN D-SUB RCPT R/A 9POS 15GOLD
Tyco Electronics
Amp
1734354-2
1
J4
DO NOT INSTALL
120-pin MINI EDGE CARD SOCKET
Samtec
MEC1-160-02-L-D-A
3
JP1, JP2, JP3
3 X 2 Header 2.54mm on center 6
mm/2.5mm
Samtec
TSW-103-07-G-D
1
JP4
4 X 2 Header 2.54mm on center 6
mm/2.5mm
Samtec
TSW-104-07-G-D
1
JP5, JP6, JP7,
P7, P8
18 X 2 Header 2.54mm on center 6
mm/2.5mm
Samtec
TSW-118-07-G-D
1
L1
Shielded 10uH Power Inductor 0805
Coilcraft
0805PS-103KLC
1
LCD1
DO NOT INSTALL
—
—
1
LCD2
16X2 FTN Reflective No. BLWT COG 3V
TianMa.
TM162JCAWG1
4
MOD1
25 X1 Header 1.27mm on center
Samtec
MTMS-125-01-G-S-230
1
P1, P2
CONN TERM BLK PLUG 6A 3.5MM 3POS
Keystone Electronics®
8723
1
P3
CONN TERM BLK PLUG 6A 3.5MM 2POS
Keystone Electronics
8722
Note 1:
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOMused in manufacturing uses all RoHS-compliant components.
© 2008 Microchip Technology Inc.
DS51777A-page 31
Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Description
Manufacturer
Part Number
1
P3
TERM BLK PIN HEADER 24Pin Pos
One 24 Pin Header is enough for 3 Boards
Keystone Electronics
8724
1
P5
10 X2 Header 2.54mm on center 6
mm/2.5mm
Samtec
TSW-110-07-G-D
1
P9
DO NOT INSTALL
—
—
1
PCB
RoHS Compliant Bare PCB, MCP3909 ADC
Evaluation Board for 16-Bit MCUs
Microchip Technology
Inc.
104-000189
13
R1, R2, R3, R4,
R6, R8, R9, R10,
R17, R18, R25,
R29, R35
DO NOT INSTALL
—
—
4
R5, R7, R11, R12
RES 1.0K OHM .1% 1/4W 0805 SMD
Susumu Co Ltd
RGH2012-2E-P-102-B
4
R13, R19, R23,
R30
RES 4.70K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX4701
8
R14, R20, R24,
R31, R32, R33,
R36, R37
RES 1.00K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1001
4
R15, R21, R61,
R73
RES 10.0K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1002
1
R16
RES 1.30K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1301
2
R22, R26
RES 0.0 OHM 1/10W 5% 0603 SMD
Rohm
MCR03EZPJ000
2
R27, R28
RES 2.20K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX2201
3
R34, R40, R51
RES 1.00M OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1004
28
R38, R39, R41,
R42, R43, R45,
R46, R47, R48,
R49, R50, R52,
R53, R54, R55,
R56, R57, R58,
R62, R63, R64,
R65, R66, R67,
R68, R69, R77,
R78
RES 100 OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1000
7
R44, R70, R71,
R72, R74, R75,
R76
RES 100K OHM 1/10W 1% 0603 SMD
Rohm
MCR03EZPFX1003
MCR10EZHF10R0
2
R59, R60
RES 10.0 OHM 1/8W 1% 0805 SMD
Rohm
4
SW1,SW2, SW3,
SW4
SWITCH TACT 6MM 230GF H=4.3MM
Omron Electronics Inc B3S-1002P
- ECB Div
1
TP1
Wire Test Point 0.3" Length
Component
Corporation
PJ-202-30
1
U1
IC REG LDO 800MA 5.0V SOT-223
National
Semiconductor
LM1117MP-5.0/NOPB
1
U2
IC PIC USB MCU FLASH 48KX16 80TQFP
Microchip Technology PIC18F86J55-I/PT
Inc
1
U3
IC REG LDO 800MA 3.3V SOT-223
National
Semiconductor
1
U4
IC ENERGY METER 24SSOP
Microchip Technology MCP3909-I/SS
Inc
1
U5
IC SRAM 4MB ASYNC 44-TSOPII
ISSI, Integrated
Silicon Solution Inc
IS61LV5128AL-10TLI
1
U6
IC DRVR/RCVR MLTCH RS232 20TSSOP
Texas Instruments
MAX3223IPWR
1
U7
DO NOT INSTALL
—
—
Note 1:
LM1117MP-3.3/NOPB
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOMused in manufacturing uses all RoHS-compliant components.
© 2008 Microchip Technology Inc.
DS51777A-page 32
Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Description
Manufacturer
Part Number
1
U8
2.7V Voltage Supervisor SOT-23-3
Microchip Technology MCP130T-270I/TT
Inc
1
X1
CRYSTAL 48.0000MHZ 10PF SMD
Abracon Corporation
1
X2
CRYSTAL 3.579545MHZ 18PFFUND SMD
Abracon Corporation
ABLS-3.579545MHZ-B2-T
1
X3
CRYSTAL 8.000MHZ 18PF FUND SMD
Abracon Corporation
ABLS-8.000MHZ-B2-T
9
Jumpper Shunt
CONN JUMPER SHORTING TIN
Sullins Connector
Solutions
STC02SYAN
4
Ea. Conner of
PCB
STANDOFF HEX .500/4-40THR NYLON
Keystone Electronics
1902C
4
Ea. Conner of
PCB
SCREW MACH PHIL 4-40X3/8 NYLON
Building Fasteners
NY PMS 440 0038 PH
Note 1:
ABM3B-48.000MHZ-10-1-U-T
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOMused in manufacturing uses all RoHS-compliant components.
© 2008 Microchip Technology Inc.
DS51777A-page 33
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-4182-8400
Fax: 91-80-4182-8422
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
01/02/08
DS51777A-page 34
© 2008 Microchip Technology Inc.