Microchip Technology PICtail User Manual

 2004 Microchip Technology Inc. DS51523A

Mixed Signal

PICtail™ Demo Board

User’s Guide

DS51523A-page ii  2004 Microchip Technology Inc.

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and may be superseded by updates.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
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Printed on recycled paper.

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
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Microchip received ISO/TS-16949:2002 quality system certification for
its worldwide headquarters, design and wafer fabrication facilities in
Chandler and Tempe, Arizona and Mountain View, California in
October 2003. The Company’s quality system processes and
procedures are for its PICmicro

®

8-bit MCUs, 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.

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page iii

Table of Contents

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

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

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

1.2 Purpose and Utility of the Mixed Signal PICtail™ Demo Board ..................... 5

1.3 Contents of the Mixed Signal PICtail™ Demo Board Kit ................................ 5

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

2.1 Introduction ..................................................................................................... 7

2.2 Features ......................................................................................................... 7

2.3 Getting Started ............................................................................................... 7

2.4 Running the demos ...................................................................................... 13

Appendix A. Schematics and Layouts ...................................................................... 17

A.1 Introduction .................................................................................................. 17

Appendix B. Bill-Of-Materials (BOM) ......................................................................... 25

Appendix C. MixedSignal_V100.asm Description .................................................... 27

Appendix D. DAC_dtmf.asm Source Code ............................................................... 29

Appendix E. MixedSignal_16f767i.lkr Source Code ................................................. 39

Appendix F. DTMF Scope Captures .......................................................................... 41

Appendix G. Scope Probe Noise Captures ............................................................... 43

Appendix H. Sine Wave and Filtered DTMF Scope Captures ................................. 45

Appendix I. MPLAB® IDE Screen Capture ................................................................ 47

Worldwide Sales and Service .................................................................................... 48

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page iv  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 1

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the
Mixed Signal PICtail™ Demo Board. Items discussed in this chapter include:

• About This Guide

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

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.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 2  2004 Microchip Technology Inc.

ABOUT THIS GUIDE

Document Layout

This document describes how to use the Mixed Signal PICtail™ Demo Board. The
manual layout is as follows:

• Chapter 1. Product Overview – Important information about the Mixed Signal

PICtail™ Demo Board.

• Chapter 2. Installation and Operation – Includes instructions on how to get

started with this demo board and a detailed description of each function of the
demo board.

• Appendix A. Schematics and Layouts – Shows the schematic and layout

diagrams for the Mixed Signal PICtail™ Demo Board.

• Appendix B. Bill-Of-Materials (BOM) – Lists the parts used to build the Mixed

Signal PICtail™ Demo Board.

• Appendix C. MixedSignal_V100.asm Description – Example “Main” assembly

firmware for the PIC16F767-I/SS microcontroller used to demonstrate the various
features of the supported analog products.

• Appendix D. DAC_dtmf.asm Source Code – Example assembly source

firmware used to generate Dual Tone Multiple Frequency (DTMF) signals. This
firmware is utilized by the “Main” firmware, MixedSignal_v100.ASM.

• Appendix E. MixedSignal_16f767i.lkr Source Code – Linker script file used to

build the example PIC16F767 firmware.

• Appendix F. DTMF Scope Captures – Oscilloscope screen captures of the

various DTMF tones displaying their FFT to illustrate the quality of the DTMF
tones.

• Appendix G. Scope Probe Noise Captures – Isolating scope probe noise is

challenging. These scope captures illustrate the difference between using a
standard scope probe and using coaxial cable directly from the board into the
scope.

• Appendix H. Sine Wave and Filtered DTMF Scope Captures – Oscilloscope

screen capture of the 32-step sine wave routine and the DTMF waveform. The
DTMF waveform illustrates the non-filtered DAC output and a simple RC-filtered
output.

• Appendix I. MPLAB® IDE Screen Capture – MPLAB IDE 6.3x was used to gen-

erate the example source firmware. This screen capture illustrates the tool, the
project files and the included Watch windows.

Preface

 2004 Microchip Technology Inc. DS51523A-page 3

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog
A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

“Save project before build”

Underlined, italic text with
right angle bracket

A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

‘bnnnn A binary number where n is a

digit

‘b00100, ‘b10

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier font:

Plain Courier Sample source code #define START

Filenames autoexec.bat
File paths c:\mcc18\h
Keywords _asm, _endasm, static
Command-line options -Opa+, -Opa-
Bit values 0, 1

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

any valid filename

0xnnnn A hexadecimal number where

n is a hexadecimal digit

0xFFFF, 0x007A

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe
character: { | }

Choice of mutually exclusive
arguments; an OR selection

errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by
user

void main (void)
{ ...
}

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 4  2004 Microchip Technology Inc.

RECOMMENDED READING

This user's guide describes how to use the Mixed Signal PICtail™ Demo Board. Other
useful documents are listed below. The following Microchip documents are available
and recommended as supplemental reference resources.

MCP4921/22, “12-Bit DAC with SPI™ Interface” Data Sheet (DS21897)

Provides detailed information regarding the MCP492X devices.

TC1320, “8-Bit Digital-to-Analog Converter with Two-Wire Interface” Data Sheet
(DS21386)

Provides detailed information regarding the TC1320 device.

TC1321, “10-Bit Digital-to-Analog Converter with Two-Wire Interface” Data Sheet
(DS21387)

Provides detailed information regarding the TC1321 device.

MCP3302/3304, “13-Bit Plus Sign Differential Input 2.7V Low-Power A/D
Converter with SPI™ Serial Interface” Data Sheet (DS21697)

Provides detailed information regarding the MCP3302 and MCP3304 devices.

MCP3204/3208, “2.7V 12-Bit A/D Converters with SPI™ Serial Interface” Data
Sheet (DS21298)

Provides detailed information regarding the MCP3204 and MCP3208 devices.

MCP1525/1541, “2.5V and 4.096V Voltage Reference” Data Sheet (DS21653)

Provides detailed information regarding the MCP1525 and MCP1541 devices.

TC55, “1 µA Low-Dropout Positive Voltage Regulator” Data Sheet (DS21653)

Provides detailed information regarding the TC55 device.

MCP1700, “Low-Quiescent Current LDO” Data Sheet (DS21826)

Provides detailed information regarding the MCP1700 device.

MCP616/617/618/619, “2.3V to 5.5V Micropower Bi-CMOS Op Amps” Data Sheet
(DS21613)

Provides detailed information regarding the MCP616, MCP617, MCP618 and MCP619
devices.

PIC16F737, PIC16F747, PIC16F767, PIC16F777, “PIC16F7X7 Data Sheet”
(DS30498)

Provides detailed information regarding the PIC16F737, PIC16F747, PIC16F767 and
PIC16F777 devices.

Preface

 2004 Microchip Technology Inc. DS51523A-page 5

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 (FAQ), technical

support requests, online discussion groups and 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
(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

In addition, there is a Development Systems Information Line which lists the latest
versions of Microchip's development systems software products. This line also
provides information on how customers can receive currently available upgrade kits.

The Development Systems Information Line numbers are:

1-800-755-2345 – United States and most of Canada

1-480-792-7302 – Other International Locations

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 6  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 7

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the Mixed Signal PICtail™ Demo Board and
covers the following topics:.

• Purpose and utility of the Mixed Signal PICtail™ Demo Board

• Contents of the Mixed Signal PICtail™ Demo Board Kit

1.2 PURPOSE AND UTILITY OF THE MIXED SIGNAL PICtail™ DEMO BOARD

The Mixed Signal PICtail™ Demo Board allows the system designer to quickly evaluate
the suitability of several Microchip analog products for their product’s design.
Microchip’s Digital-to-Analog Converters (DACs), Analog-to-Digital Converters
(ADCs), V

REF

s, Low Dropout Output (LDO) regulators and the PIC16F7X7 devices are
supported. Evaluating precision analog products for specific applications can be
challenging for practical reasons. First, many products are only available in
surface-mount packages. Secondly, analog circuits tend to be affected adversely by
system noise. Common breadboarding techniques are not practical for these reasons.
The Mixed Signal PICtail™ Demo Board utilizes a 4-layer Printed Circuit Board (PCB),
with attention paid to reducing system noise.

The Mixed Signal PICtail™ Demo Board can isolate a specific device’s performance to
establish baseline performance. The board can be customized quickly for specific
system requirements.

1.3 CONTENTS OF THE MIXED SIGNAL PICtail DEMO BOARD KIT

This Mixed Signal PICtail™ Demo Board includes:

• The Mixed Signal PICtail™ Demo Board PCB

• PIC16F767 firmware that demonstrates how to configure and write to the

MCP492X, MCP482X and TC132X DAC products

• PIC16F767 firmware demonstrating DTMF generation using a DAC

• PIC16F767 firmware demonstrating sine-wave generation using a DAC

• PIC16F767 firmware to configure and read the MCP330X/320X SAR ADCs

• PIC16F767 firmware that configures and reads the MCP3551 Sigma-Delta ADC

• MCP617 dual op amp (standard 8-pin dual layout) that can be configured as an

input signal filter (ADC) or an output signal conditioning stage for the DACs

• Four DIP switches allow simple firmware mode selection

• Two indicator LEDs (red and green) for visual feedback

• PICkit™ 1 Flash Starter Kit’s 14-pin header provides an interface to Microchip’s

8- and 14-pin PICmicro

®

microcontroller devices

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 8  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 9

Chapter 2. Installation and Operation

2.1 INTRODUCTION

The Mixed Signal PICtail™ Demo Board demonstrates several Microchip analog
products in a signal chain configuration. The product families demonstrated include
DACs, ADCs, V

REF

s, LDOs and PICmicro® microcontroller devices. Evaluating
precision analog products for specific applications can be challenging due to noise
sources related to the PCB layout and not the silicon under evaluation. The Mixed Signal
PICtail™ Demo Board provides the necessary hardware and firmware to exercise each
of these devices in real-world applications. Users can quickly modify the existing
hardware and firmware to validate functionality for their specific system needs.

2.2 FEATURES

The Mixed Signal PICtail™ Demo Board has the following features:

• Printed Circuit Board (PCB) is a 4-layer board designed to minimize external

noise

• A 28-pin PICmicro (PIC16F767) microcontroller footprint is provided to permit

code development. In-Circuit Debugger is supported via the RJ11 connector

• The 14-pin header is designed to seamlessly interface to the PICkit™ 1 Flash

Starter Kit

• Firmware demonstrating DTMF generation on the MCP492X/482X DAC is

included

• Firmware demonstrating a precision sine-wave generation on the TC132X DAC is

included

• Firmware to configure and read the MCP330X/320X SAR ADCs is included

• Two precision voltage references (V

REF

s) are supported (can compare noise)

• Flexible amplifier circuit layout supports a dual op amp in multiple configurations

for either an input signal filter (ADC) or an output signal-conditioning stage for the
DACs

• Four DIP switches allow simple firmware mode selection are supported

• Two indicator LEDs (red and green) are supported

• Can be powered by either the PICkit™ 1 Flash Starter Kit or by an external 9V

supply

2.3 GETTING STARTED

The Mixed Signal PICtail™ Demo Board is assembled and tested for evaluation and
demonstration of the MCP492X, MCP482X, TC132X, MCP3551, MCP3302,
MCP3204, MCP1541, MCP1701, PIC16F767 and MCP617 features. Additional
product samples with footprints supported by this board are included. A block diagram
of the demo board is shown in Figure 2-1. Refer to Appendix A. “Schematics and
Layouts” and Appendix B. “Bill-Of-Materials (BOM)” for more detailed circuit
information.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 10  2004 Microchip Technology Inc.

FIGURE 2-1: Mixed Signal PICtail™ Demo Board Block Diagram.

S

1

Mode Switch

14

5

MCP1541
MCP1525

U9

V

REF

REF198G

U11

V

REF

(for debugging

MPLAB

®

ICD

J4

and programming)

PICkit™ 1

J1, J2, J3

Flash Starter Kit

TC55 (10V

V

IN

)

MCP1701 (10V

V

IN

)

MCP1700 (<6V

V

IN

)

V

DD2

V

IN

3

3

2

SPI™

CS0

SPI™
I

2

C™

CS1

3

SPI™

I2C™

V

OUTA

V

OUTB

V

OUTC

MCP4921 DAC

MCP4821 DAC
MCP4822 DAC

U5 & U10

MCP4922 DAC

TC1320 DAC
TC1321 DAC

U7

MCP3302/2304

ADC

U2

MCP617

Dual Op Amp

U12

MCP3551 ADC

U6/U8

U1

PICmicro

®

MCU

U4

Header

PIC16F767

Header

Installation and Operation

 2004 Microchip Technology Inc. DS51523A-page 11

2.3.1 The Hardware

Figure 2-2 shows the layout of the Mixed Signal PICtail™ Demo Board with indicators
to points of interest, while Table 2-1 details the PICkit™ 1 Flash Starter Kit Header
connections. Jumpers JP1-JP5 are fully described in Section 2.3.2 “The Embedded
System Firmware”.

FIGURE 2-2: Mixed Signal PICtail™ Demo Board.

MCP3551-I/MS

22-Bit ADC

MCP1541 4.1V
MCP1525 2.5V

Voltage Reference

Analog Devices REF198G

4.096V Voltage Reference

MCP3551-I/P

22-Bit ADC

MCP4821-I/SN
MCP4822-I/SN
MCP4921-I/SN

12-Bit SPI™ DAC

JP3 V

OUTB

Selector

JP5 – MCP4X9X Part Selector

MCP4922-I/SL
12-Bit SPI™ DAC

TC132X-I/MS
8-Bit/10-Bit I

2

C™ DAC

TC55RP5002 5.0V LDO (10V V

IN

)

MCP1701T-5002I/CB 5.0V LDO (10V V

IN

)

MCP1700T-5002I/CB 5.0V LDO (6V V

IN

)

Mode Selector DIP switches

Red and Green LEDs

PIC16F767-I/SS
28-pin Flash
PICmicro

®

Microcontroller

with Internal Oscillator

JP1 V

OUTC

Selector

JP2 V

OUTA

Selector

MCP3302-I/SL

MCP3204-I/SL

13-Bit Differential SPI™ ADC

12-Bit Single-ended SPI™ ADC

MCP617-I/SN Dual Op Amp
(can be any dual or single op amp
using the standard footprint)

V

OUTD

SMA Connector

JP4a ADC V

REF

Source Selector

JP4b DAC V

REF

Source Selector

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 12  2004 Microchip Technology Inc.

TABLE 2-1: PICkit™ 1 FLASH STARTER KIT 14-PIN HEADER INTERFACE

PINS

Pin Name

Pin

Number

Pin

Type

Buffer

Type

Description

V

SS

14 — — Electrical Ground. Both analog and digital.

V

IN

13 — — Power Supply Input. Refer to Note 2 in Appendix A

“Schematics and Layouts”. Do not plug in 9V
supply and connect to PICkit™ 1 Flash Starter Kit.

CS0 12 O — SPI™ Chip Select signal for the external ADCs. Do

not populate both the MCP3551 and the MCP3302
as they share the same CS0 signal.

SCK/SCL 11 O ST SPI Clock or I

2

C™ Clock Signal. Note that external

weak pull-up R

20

connects this signal to V

DD2

.

SDI/SDA 10 I/O ST SPI Data In or I

2

C Data signal (Data Out on ADC).
Note that external weak pull-up R14 connects this sig­nal to V

DD2

.

SDO 9 O — SPI Data Out Signal (Data In on DAC and ADC)

CS1 8 O — SPI Chip Select Signal for the External DACs. Do not

populate both the MCP492X and the MCP482X as
they share the same CS0 signal.

LDAC 7 O — Latches the DAC Output When Low. Note the weak

pull-down resistor R

5

if the firmware doesn’t drive the

pin to a desired state.

V

REF_ADC

6 I — JP4 selects the V

REF

source to use as the ADC
reference signal. The PICmicro® microcontroller on
the PICkit™ 1 Flash Starter Kit may use this for its
internal ADC’s V

REF

.

LED0/TX 5 O — Active High Red LED Signal. This I/O also has the

USART’s TX signal multiplexed on it.

LED1/RX 4 I/O — Active High Green LED Signal. This I/O also has the

USART’s RX signal multiplexed on it.

SW0 3 I — S1’s Switch 1. This pin uses the internal pull-up resis-

tor to determine when the switch is open.

SW1 2 I — S1’s Switch 2. This pin uses the internal pull-up resis-

tor to determine when the switch is open.

SW2 1 I — S1’s Switch 3. This pin uses the internal pull-up resis-

tor to determine when the switch is open.

Legend: TTL = TTL compatible input ST = Schmitt Trigger input with CMOS levels

I = Input O = Output

Installation and Operation

 2004 Microchip Technology Inc. DS51523A-page 13

2.3.2 The Embedded System Firmware

The Mixed Signal PICtail™ Demo Board firmware utilizes PICmicro® microcontroller
assembly language, Microchip MPASM™ assembler and MPLINK™ linker to build
the.HEX machine file. MixedSignal_v100.asm, DAC_dtmf.asm, p16F767.inc
and MCP492X_16f767i.lkr files are needed in your project to build the

MixedSignalPICtail.hex.
MixedSignal_v100.asm contains the main program and most of the subroutines.

After initialization of critical PICmicro microcontroller peripherals (including the internal
oscillator to 8 Mhz), the main loop polls the four DIP switches to determine the selected
mode of operation. The DIP switches create a 4-bit binary number from 0 to 15. If a
change of mode is detected for 100 ms during 500 ms of scanning, a new mode is
selected and the LEDs are alternately flashed for two seconds. Most of the modes will
time-out and re-scan the DIP switches periodically.

Refer to Appendix C. “MixedSignal_V100.asm Description” for the commented
source code further describing each mode.

Modes 0XXX primarily utilize the MCP492X DAC modes:

1. Mode0000: Use the DTMF generation subroutine (located in DAC_dtmf.asm)

to dial a phone number stored in memory. Analyze output on V

OUTB

or V

OUTD

’s

SMA connector. See Appendix F. “DTMF Scope Captures” for resulting
waveform frequency analysis.

2. Mode0001: Send 000h and FFFh commands to generate a 100 Hz R-R output

on the MCP492X. Probe V

OUTA

and V

OUTB

to see the resulting waveforms.

3. Mode0010: Send 400h and BFFh commands to generate a 100 Hz output on the

MCP492X. Probe V

OUTA

and V

OUTB

to see the resulting waveforms.

4. Mode0011: DACA = SHDN, DACB = SHDN, PIC = SLEEP. This mode demon-

strates the low-power nature of the DAC, the PICmicro microcontroller, the op
amp and the LDO. A power cycle is required after the mode switch is changed to
exit this mode.

5. Mode0100: DACB and DACA = 800h and Read w/PIC16F767 10b ADC, “broad-

cast on USART”. This mode is useful for evaluating the PICmicro microcontroller’s
ADC. A

IN_B

can be injected with an alternative signal and the result can be
analyzed through the 19200 baud async, 9-bit transmission. Microchip’s Data
View analysis tool, along with the MCP3551 USB evaluation board, provide a
“canned” analysis solution.

6. Mode0101: DACB = 801h, DACA = 800h and Read w/MCP3302 13b Dif, “broad-

cast on USART”. This mode is useful for evaluating the MCP3302 or the
MCP3204 ADC. A

IN_B

can be injected with an alternative signal and the result
can be analyzed through the 19200 baud async, 9-bit transmission. Microchip’s
Data View analysis tool, along with the MCP3551 USB evaluation board, provide
a “canned” analysis solution.

7. Mode0110: DACB and DACA = 800h and Read w/MCP3551, “broadcast on

USART”. This mode is useful for evaluating the MCP3551 ADC or the MCP1541
V

REF

. A

IN_B

can be injected with an alternative signal and the result can be
analyzed through the 19200 baud async, 9-bit transmission. Microchip’s Data
View analysis tool, along with the MCP3551 USB evaluation board, provide a
“canned” analysis solution.

8. Mode0111: Open for user to define their own routine.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 14  2004 Microchip Technology Inc.

Modes 1XXX primarily utilize TC132X DAC modes:

1. Mode1000: Generate a 100 Hz 32-step sine wave on the TC132X. Analyze

output on V

OUTC

. See Appendix H. “Sine Wave and Filtered DTMF Scope

Captures” for resulting unfiltered waveform.

2. Mode1001: Send 000h and FFFh commands to generate a 100 Hz R-R output

on the TC132X. Probe V

OUTC

to see the resulting waveforms.

3. Mode1010: Send 400h and BFFh commands to generate a 100 Hz output on the

TC132X. Probe V

OUTC

to see the resulting waveforms.

4. Mode1011: DAC = SHDN, PIC = SLEEP. This mode demonstrates the

low-power nature of the DAC, the PICmicro microcontroller, the op amp and the
LDO. A power cycle is required after the mode switch is changed to exit this
mode.

5. Mode1100: DAC = 200h and Read with PIC16F767 10b ADC, “broadcast on

USART”. A

IN_C

can be analyzed using Microchip’s Data View analysis tool,
which, along with the MCP3551 USB evaluation board, provides a “canned”
analysis solution.

6. Mode1101: DAC = 200h and Read with MCP3302 13b single-ended, “broadcast

on USART”. A

IN_C

can be analyzed using Microchip’s Data View analysis tool,
which, along with the MCP3551 USB evaluation board, provides a “canned”
analysis solution.

7. Mode1110: Open for user to define their own routine.

8. Mode1111: Open for user to define their own routine.

Refer to Appendix C. “MixedSignal_V100.asm Description” to view source code
and comments.

Refer to Appendix D. “DAC_dtmf.asm Source Code” to view source code and
comments.

Refer to Appendix E. “MixedSignal_16f767i.lkr Source Code” to view the script.
Refer to the p16F767.inc standard include file located in your

“\MPLAB IDE\MCHIP_Tools\” folder.

Installation and Operation

 2004 Microchip Technology Inc. DS51523A-page 15

2.4 RUNNING THE DEMOS

The Mixed Signal PICtail™ Demo Board was designed to utilize the PIC16F767
located on the PCB or a PICmicro microcontroller operating on the PICkit™ 1 Flash
Starter Kit board. This Mixed Signal PICtail™ Demo Board User’s Guide will only
discuss the stand-alone operation utilizing the PIC16F767.

2.4.1 Power

The Mixed Signal PICtail™ Demo Board can be powered by either the PICkit™ 1 Flash
Starter Kit’s V

DD

and VSS signals or by a DC power supply 9V (5V minimum and 10V
maximum). The onboard TC55 5.0V LDO produces a regulated 5.0V supply to operate
the analog devices under test. The Mixed Signal PICtail™ Demo Board User’s Guide
assumes the standard 9V power supply that comes with many of Microchip’s develop­ment tools (including the MPLAB

®

ICD 2) is utilized. The standard 9V DC connector is

provided for your convenience.

With the default firmware programmed into the PIC16F767, the LED’s should
alternately flash for approximately two seconds upon power-up.

2.4.2 Selecting the Mode

S1 is a 4-position DIP switch numerically labeled 1, 2, 3 and 4. These contact switches
have one terminal tied to V

SS

and one terminal connected to a 1 kΩ resister in series

with the PIC16F767 PORTB<4:7> I/O port. These pins have an internal weak pull-up
to prevent the I/O from floating when the corresponding DIP switch is open. The DIP
switch is labeled with an arrow indicating the “on” (or closed) position of the switch.
When the DIP switch is on, the I/O pin is pulled down to V

SS

. The default firmware will

interpret this as a “0”. The binary combination of these four DIP switches determine the
mode of operation.

Refer to Section 2.3.2 “The Embedded System Firmware” for operational details for
each mode.

2.4.3 Jumper JP1 Selection

Jumper JP1 is located in the center of the board closest to the PICmicro microcontroller
and its MPLAB ICD 2 connector. JP1 consists of three pairs of jumper pins. The
lower-two pins are connected to A

IN_C

. The two center pins are connected to V

OUTC

.

The top-two pins are connected to A

IN_D

.

Refer to Figure 2-2 and Appendix A. “Schematics and Layouts”.

If the user would like to read the output of Microchip’s TC132X DAC using either the
MCP3302 or MCP3204, place a jumper from one of the middle two pins to either of the
outer pins, depending on which ADC input channel you are using.

Note: Selecting the mode requires the user to not “read” the switches as a binary

number. Switch 1 is on the left, while switch 4 is on the right. Typically, the
most significant digit is on the left, unlike this configuration. In addition, the
“on” position represents a “0”, which is also counterintuitive. The user could
alter the default firmware to interpret the mode switches differently (change
the jump table’s order) or simply look at the board with the 14-pin header
located at the top.

Note: The default firmware Mode1101 requires JP1 to be connected to A

IN_C

.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 16  2004 Microchip Technology Inc.

2.4.4 Jumper JP2 Selection

Jumper JP2 is located in the center of the board above JP1. JP2 consists of three pairs
of jumper pins. The lower two pins are connected to A

IN_A

. The middle two pins are

connected to V

OUTA

. The top two pins are connected to A

IN_C

. Refer to Figure 2-2 and

Appendix A. “Schematics and Layouts”.

If the user would like to read Microchip’s MCP492X or MCP482X DAC A output with
either the MCP3302 or MCP3204, place a jumper from one of the middle two pins to
either of the outer pins, depending on which ADC input channel you are using.

2.4.5 Jumper JP3 Selection

Jumper JP3 is located in the center of the board just above the 8-pin, dual op amp
MCP617 and to the right of the SMA connector’s footprint. JP3 consists of three pairs
of jumper pins. The lower two pins are connected to A

IN_D

. The middle two pins are

connected to V

OUTB

. The top two pins are connected to A

IN_B

. Refer to Figure 2-2 and

Appendix A. “Schematics and Layouts” to view the schematic.

If the user would like to read Microchip’s MCP492X or MCP482X DAC B output with
either the MCP3302 or MCP3204, place a jumper from one of the middle two pins to
either of the outer pins, depending on which ADC input channel you are using.

2.4.6 Jumper JP4 Selection

Jumper JP4 is located in the center of the board, farthest away from the PICmicro
microcontroller and its MPLAB ICD 2 connector. JP4 consists of three pairs of jumper
pins. The lower two pins are connected to the MCP1541’s 4.1V V

REF

output. The top

two pins are connected to the REF198G’s 4.1V V

REF

output. The middle two pins are

NOT connected, similar to J1, J2 or J3. The middle left pin selects the V

REF_ADC

source while the middle right pin selects the V

REF_DAC

source. Refer to Figure 2-2 and

Appendix A. “Schematics and Layouts”.

If the user employs the REF19G as the V

REF

source for Microchip’s MCP492X or
TC132X DACs, a jumper connecting the top right pin with the middle right pin is
required. If the user would like to use the MCP1541 as the V

REF

source for Microchip’s
MCP492X, MCP482X or TC132X DACs, a jumper connecting the bottom right pin with
the middle right pin is required.

If the user employs the REF19G as the V

REF

source for Microchip’s MCP3302,
MCP3204 or PIC16F767 ADCs, a jumper connecting the top right pin with the middle
right pin is required. If the user employs the MCP1541 as the V

REF

source for
Microchip’s MCP492X, MCP482X or TC132X DACs, a jumper connecting the bottom
right pin with the middle right pin is required.

Note: The default firmware Mode0101 requires JP3 to be connected to A

IN_B

to

read V

OUTB

with the MCP3302 or MCP3204.

Note: The default firmware requires a V

REF_DAC

jumper to function for almost all

modes.

Note: The default firmware Modes0100, 0101, 1100 and 1101 require V

REF_ADC

to be selected in order to function.

Installation and Operation

 2004 Microchip Technology Inc. DS51523A-page 17

2.4.7 Jumper JP5 Selection

Jumper JP5 is located along the right side of the board, just above the 14-pin MCP492X
footprint. JP5 consists of three jumper pins.

JP5 is used to configure the board for the Microchip SPI DAC that gets soldered onto
the board. Refer to Figure 2-2 and Appendix A. “Schematics and Layouts”.

• If the MCP4922 is used, no jumper is required.

• If the MCP4921 is used, a jumper on the right two pins is required.

• If the MCP4822 is used, no jumper is required.

• If the MCP4821 is used, a jumper on the left two pins is required.

2.4.8 Probe Connections

The most commonly probed signals are available using the surface-mount test points
located along the sides of the board. These test points are labeled by the silk-screen.
Note that four of these test points are oversized (2x) and are on both sides of the board.
This is convenient for connecting probe ground “alligator” clips. These ground
connections are critical for minimizing probe noise. The MCP3551 22b ADC is sensitive
enough to “see” these noise signals enough to significantly reduce performance. J7 is
a SMA connector to allow a fully-shielded connection from the ADC input (V

OUTD

) to

your scope. Appendix G. “Scope Probe Noise Captures” illustrates the difference
between a normal probe connection and the SMA connection. As you can see, the
noise is a product of the scope connection, not the op amp buffer or ADC.

2.4.9 MPLAB ICD 2 Header J4

When using the PIC16F767 (or any other Flash, 28-pin, PICmicro microcontroller with
compatible footprint) the MPLAB ICD 2 is a low-cost development tool that can be
utilized for code development. The MPLAB ICD 2 has defined a standard connector to
simplify In-Circuit Debugging and In-Circuit Serial Programming (ICSP™) of the
PICmicro microcontroller.

The MPLAB ICD 2 system is particularly advantageous when developing mixed signal
solutions. The MPLAB ICD 2 does not introduce any stray inductance or capacitance
typical of emulators’ adapters, cables and interface boards. The PICmicro
microcontroller can be soldered onto the board just as it would for standard production.
The MPLAB ICD 2 signals remain static during normal operation, therefore adding no
noise to the system while executing code.

This RJ11 connector would not be used if the PICkit™ 1 Flash Starter Kit is used for
development.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 18  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 19

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layouts for the Mixed Signal PICtail™
Demo Board.

Diagrams included in this appendix:

• Board Schematic

• Board - Top + Silk Screen Layer

• Board - Power Layer

• Board - Top Layer

• Board - Bottom Layer

• Board - Ground Layer

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 20  2004 Microchip Technology Inc.

FIGURE A-1: BOARD SCHEMATIC - PAGE 1

M

Schematics and Layouts

 2004 Microchip Technology Inc. DS51523A-page 21

FIGURE A-1: BOARD SCHEMATIC - CONTINUED

M

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 22  2004 Microchip Technology Inc.

FIGURE A-2: BOARD LAYOUT - TOP + SILK-SCREEN LAYER

Schematics and Layouts

 2004 Microchip Technology Inc. DS51523A-page 23

FIGURE A-3: BOARD LAYOUT - POWER LAYER

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 24  2004 Microchip Technology Inc.

FIGURE A-4: BOARD LAYOUT - TOP LAYER

Schematics and Layouts

 2004 Microchip Technology Inc. DS51523A-page 25

FIGURE A-5: BOARD LAYOUT - BOTTOM LAYER

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 26  2004 Microchip Technology Inc.

FIGURE A-6: BOARD LAYOUT - GROUND LAYER

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 27

Appendix B. Bill-Of-Materials (BOM)

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

Qty Reference Description Manufacturer Part Number

1 C1 Capacitor, Ceramic, 1000 pf

50V, 5%, C0G 0805

Murata Electronics

®

North America

GRM2165C1H102JA01D

11 C4, C5, C9, C10, C12, C13,

C15, C21, C22, C27, C28

Capacitor, 10000 pf, 50V
Ceramic, X7R 0805

Kemet

®

C0805C103K5RACTU

6 C3, C8, C11, C16, C17, C24 Capacitor, .1 uf, 16V,

Ceramic X7R 0805

Panasonic® - ECG ECJ-2VB1C104K

4 C2, C14, C23, C26 Capacitor, 1 uf, 16V,

Ceramic Y5V 0805

Panasonic - ECG ECJ-2VF1C105Z

4 C6, C18, C19, C20 Capacitor, Ceramic 100 pf,

50V, NP0 0805

Kemet C0805C101J5GACTU

1 C25 Capacitor, 10 uf, 16V, SMT Panasonic VS series ECEV1CS100SR

1 D2 LED, Green, 565 nm, PLCC,

120 deg

Lite-On Trading
USA, Inc.

LTST-T670GKT

1 D1 LED, 2.8x3.2 mm, 635 nm,

Red, CLR SMD

Lumex

®

Opto/

Components Inc.

SML-LX2832IC-TR

2 J1, J2 Conn, Header, 14pos, .100

Vert Tin

Molex

®

/Waldom®

Electronics Corp.

22-28-4140

1 J4 Conn, Mod Jack, 6-6 R/A,

PCB 50AU

AMP/Tyco
Electronics

520470-3

1 J5 Conn, Power Jack, 2.5 mm,

PCB CIRC

CUI Inc PJ-102B

1 J7 Do Not Populate

Connectors, RF, Jack, SMA

SPC Technology SPC10611

4 JP1, JP2, JP3, JP4 Conn, Header, 6pos, .100,

Vert Gold

Molex/Waldom
Electronics Corp.

10-89-1061

1 JP5 Conn, Header, 3pos, .100,

Vert Tin

Molex/Waldom
Electronics Corp.

22-28-4030

1 L1 Inductor, Fixed, 10 uh,

Type 7BA

Toko America 144LY-100J

1 P1 Conn, Header, 14pos, .100,

R/A Tin

Molex/Waldom
Electronics Corp.

22-28-8140

3 R23, R29, R30 Resistor, 0.0Ω, 1/8w, 5%,

0805 SMD

Panasonic - ECG ERJ-6GEY0R00V

6 R1, R2, R3, R4, R11, R12 Resistor, 1.00 kΩ, 1/10w, 1%

0805 SMD

Panasonic - ECG ERJ-6ENF1001V

2 R18, R22 Resistor, 1.00 mΩ, 1/10w, 1%

0805 SMD

Panasonic - ECG ERJ-6ENF1004V

4 R25, R26, R27, R28 Resistor, 4.99 kΩ ,1/10w, 1%

0805 SMD

Panasonic - ECG ERJ-6ENF4991V

2 R10, R31 Do Not Populate

6 R5, R6, R14, R20, R24 Resistor, 10.0 kΩ, 1/10w, 1%

0805 SMD

Panasonic - ECG ERJ-6ENF1002V

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 28  2004 Microchip Technology Inc.

5 R9, R13, R15, R16, R17 Resistor, 100Ω, 1/10w, 1%

0805 SMD

Panasonic - ECG ERJ-6ENF1000V

2 R7, R8 Resistor, 470Ω, 1/8w, 5%

0805 SMD

Panasonic - ECG ERJ-6GEYJ471V

1 R21 Resistor, 0.0Ω, 1/4w, 5%

1206 SMD

Yageo America 9C12063A0R00JLHFT

1 S1 Switch, Dip 4-pos,

Top Slide SMT

CTS Corporation
Resistor/Electrocom
ponents

204-4ST

12 TP1, TP2, TP3, TP4, TP5,

TP6, TP7, TP8, TP9, TP10,
TP11, TP12

PC, Test Point, Miniature
SMT

Keystone
Electronics

®

5015

1 U1 Microcontroller, 8-bit, CMOS

Flash with 10-bit A/D

Microchip
Technology Inc.

MCP16F767-I/SS

1 U4 Low Dropout Positive Voltage

Regulator

Microchip
Technology Inc.

TC55RP5001ECB713

1 U7 10-bit Digital-to-Analog

Converter

Microchip
Technology Inc.

TC1321EUA

1 U9 Voltage Reference, 4.096V Microchip

Technology Inc.

MCP1541-I/TT

1 U11 IC Volt Ref, LDO, 4.096V,

8-pin SOIC

Analog Devices Inc. REF198GS

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

Qty Reference Description Manufacturer Part Number

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 29

Appendix C. MixedSignal_V100.asm Description

TABLE C-1: MIXEDSIGNAL_V100.ASM

TITLE “Mixed Signal PICtail(TM) Board Firmware”
;***************************************************************************************
; Author: Jim Simons
; Tools: MPLAB(R) IDE 6.62 using MPLINK(tm) Linker
; Editor: ComicSans 8pt w/8 character Tabs
; Files: MixedSignal_v100.asm
; DAC_dtmf.asm
; MixedSignal_16f767i.lkr
; p16f767inc
;
; Description: Use the DIP Switches to select the mode of operation. The PIC(R) MCU then
; polls for changes in the DIP switches. If a change is detected for 100mS during 500ms of
; scanning, a new mode is selected.
;
; MCP4922 DAC modes
; Mode0000: Flash LEDs and Dial a phone number stored in memory.
; Mode0001: Send 000h & FFFh commands to generate a 100Hz R-R output on the MCP4922.
; Mode0010: Send 400h & BFFh commands to generate a 100Hz output on the MCP4922.
; Mode0011: DACA = SHDN, DACB = SHDN, PIC = SLEEP
; Mode0100: DACB & DACA = 800h & Read w/PIC16F767 10b ADC, “broadcast on USART”
; Mode0101: DACB = 801h, DACA = 800h & Read w/MCP3302 13b Dif, “broadcast on USART”
; Mode0110: DACB & DACA = 800h & Read w/MCP3551, “broadcast on USART”
; Mode0111: Open for user to define their own routine.
; TC132X DAC modes (MUST DEFINE WHICH SPECIFIC DEVICE BELOW)
; Mode1000: Flash LEDs and generate a 100Hz 32step sine wave on the TC1321.
; Mode1001: Send 000h & FFFh commands to generate a 100Hz R-R output on the TC1321.
; Mode1010: Send 400h & BFFh commands to generate a 100Hz output on the TC1321.
; Mode1011: DAC = SHDN, PIC = SLEEP
; Mode1100: DAC = 200h & Read w/PIC16F767 10b ADC, “broadcast on USART”
; Mode1101: DAC = 200h & Read w/MCP3302 13b single-ended, “broadcast on USART”
; Mode1110: Open for user to define their own routine.
; Mode1111: Open for user to define their own routine.
;
;***************************************************************************************

Due to file size, only the first page of MixedSignal_V100.asm is shown in Table C-1. Please refer to the
Microchip web site at www.microchip.com to download and view the latest version of this firmware.

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated (the “Company”) is intended and supplied to you, the
Company’s customer, for use solely and exclusively with products manufactured by the Company.

The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved.
Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil
liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATU­TORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU­LAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 30  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 31

Appendix D. DAC_dtmf.asm Source Code

TABLE D-1: DAC_DTMF.ASM

#include “p16F767.inc”
;*************************************************************************
;
; DTMF SUBROUTINE using a Rolling Loop Timer
;
; Program memory = 149 words for 32 step tone subroutine
; = 133 words for 16 step tone subroutine
; Data memory = 12 registers for tone subroutine
;
;*************************************************************************
;
; THEORY OF OPERATION - ROLLING LOOP TIMER
; 2’s complement subtraction of a marked time and a continuous timer
; (overflows from 0FFh to 0h) provides an elapsed time which can then
; be compared to some threshold value (another subtraction). The
; result of the compare (<, > or =) can then be used to perform some
; periodic event. The fewest possible cycles per loop is desired to
; achieve the least amount of error from the “zero” cycle (when the
; result of the compare is “=”). One major advantages of this
; technique is the ability to use only one timer to keep track of
; several independent periodic events with relatively few instructions
; and instruction cycles.
;
; THEORY OF OPERATION - DISTORTION
; This routine works with relatively low distortion because the
; statistical distribution of the possible error cycles doesn’t peak
; at the “zero” cycle but at some repeatable value relative to the
; “zero” cycle. Error cycles will be +-X from the distribution’s
; peak instead of from the “zero” cycle.
;
; THEORY OF OPERATION - LOOP TIMING
; LOW - No update yet = 6 cycles
; - Update output w/o resetting Sine_Table = 18
; - Update output w/reset of Sine_Table = 19
; HIGH- No update yet = 6 cycles
; - Update output w/o resetting Sine_Table = 18
; - Update output w/reset of Sine_Table & ToneLength = 22
; (Note: end of Tone until Repeat_tone re-enters >11 cycles
; depending upon user’s code)

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated (the “Company”) is intended and supplied to you, the
Company’s customer, for use solely and exclusively with products manufactured by the Company.

The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved.
Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil
liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATU­TORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU­LAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 32  2004 Microchip Technology Inc.

; OUTPUT - 5 cycles
;
; THEORY OF OPERATION - CHOOSING # OF STEPS
; Using the above #s:
; Minimum loop = 17 cycles
; Maximum loop = 46 cycles
; Maximum Low distortion = 5 + 22 + 5 = 32
; Maximum High distortion = 5 + 19 + 5 = 29
;
; These numbers need to be taken into consideration when choosing Fosc
; and the # of steps. Obviously, there is a balance between adding
; more steps (doesn’t have to be 2^X # of steps) and the distortion
; caused by not executing the minimum loop very often. The user could
; model this with most mathematical software packages to determine
; what is best for their system.
;
;*************************************************************************
DTMF UDATA
F_Low RES 1 ;# of cycles for the low frequency
F_Low_Rolling RES 1 ;last value of TMR0 when F_Low_Out was updated
F_Low_Step RES 1 ;SINE table index
F_Low_Out RES 1 ;Output duty cycle for F_Low
F_High RES 1 ;# of cycles for the high frequency
F_High_Rolling RES 1 ;last value of TMR0 when F_High_Out was updated
F_High_Step RES 1 ;SINE table index
F_High_Out RES 1 ;Output duty cycle for F_High
DTMF_Out RES 1 ;Output for DAC
ToneLength RES 1 ;# of F_High cycles used for delay
Key_Value RES 1 ;what # to dial?

GLOBAL F_Low, F_Low_Rolling,F_Low_Step, F_Low_Out, F_High, F_High_Rolling
GLOBAL F_High_Step, F_High_Out, DTMF_Out, ToneLength, Key_Value
GLOBAL Tone, Repeat_tone
EXTERN DAC_MSB, DAC_LSB, WriteToMCP492X

DTMF_SUB CODE
;
; Conditional Assembly Control Words
; ;No = 0, Yes = 1
#DEFINE Fosc_8000000 1 ;8MHz oscillator
#DEFINE Fosc_4000000 0 ;4MHz oscillator
#DEFINE Fosc_3570000 0 ;3.57MHz oscillator

#DEFINE ToneLength_150 0 ;150 ms tone per subroutine call
#DEFINE ToneLength_100 0 ;100 ms tone per subroutine call
#DEFINE ToneLength_50 1 ;50 ms tone per subroutine call

if Fosc_8000000
#DEFINE _32_steps 0 ;32 steps per cycle
#DEFINE _16_steps 1 ;16 steps per cycle
endif
if Fosc_4000000 | Fosc_3570000
#DEFINE _32_steps 0 ;32 steps per cycle
#DEFINE _16_steps 1 ;16 steps per cycle
endif

if _32_steps
;
;*************************************************************************
; This is a 32 level lookup table of a 7 bit SINE wave

DAC_dtmf.asm Source Code

 2004 Microchip Technology Inc. DS51523A-page 33

; Y = 7 bit result X = step #
;
; Y = 63 + 64 * Sin (X * 360 / 32)
;
SINE_Table_7bit ;32 step
addwf PCL,F
nop ;this location is never used since W != 0
DT .63, .75, .87, .99, .108, .116, .122, .126
DT .127, .126, .122, .116, .108, .99, .87, .75
DT .63, .51, .39, .27, .18, .10, .4, .1
DT .0, .1, .4, .10, .18, .27, .39, .51
endif

; if _32_steps & _8_bit
;*************************************************************************************
**
; 32 step lookup table of an 8 bit SINE wave
; Y = 8 bit result
; X = step #
; Y = 127 + 128 * Sin (X * 360 / 32)
;
;SINE_Table_32step_8bit
; addwf PCL,F
; nop ;this location is never used since W != 0
; DT .127, .152, .176, .198, .218, .233, .245, .253
; DT .255, .253, .245, .233, .218, .198, .176, .152
; DT .127, .102, .78, .56, .36, .21, .9, .1
; DT .0, .1, .9, .21, .36, .56, .78, .102
; endif

if _16_steps
;
;*************************************************************************
; This is a 16 level lookup table of a 7 bit SINE wave
; Y = 7 bit result X = step #
;
; Y = 63 + 64 * Sin (X * 360 / 16)
;
SINE_Table_7bit ;16 step
addwf PCL,F
nop ;this location is never used since W != 0
DT .63, .87, .108, .122
DT .127, .122, .108, .87
DT .63, .39, .18, .4
DT .0, .4, .18, .39
endif

;
;*************************************************************************
;
; DTMF Frequency Tables
;
; Key Low High
; 0 941 1336
; 1 697 1209
; 2 697 1336
; 3 697 1477
; 4 770 1209
; 5 770 1336
; 6 770 1477

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 34  2004 Microchip Technology Inc.

; 7 852 1209
; 8 852 1336
; 9 852 1477
; A 697 1633
; B 770 1633
; C 852 1633
; D 941 1633
; * 941 1209
; # 941 1477

if ((_32_steps) & (Fosc_8000000)) | ((_16_steps) & (Fosc_4000000))
;
;*************************************************************************
;
; Delay Calculation for Frequency Generation
; Fosc = 8MHz #steps = 32
; OR
; Fosc = 4MHz #steps = 16
;
; X = Fosc / ( 4 * #steps * Ftone)
;
;
F_Low_table
addwf PCL,F
;X Actual Desired %Error
retlw .66 ;947.0 941 .63%
retlw .90 ;694.4 697 .37%
retlw .90 ;694.4 697 .37%
retlw .90 ;694.4 697 .37%
retlw .81 ;771.6 770 .21%
retlw .81 ;771.6 770 .21%
retlw .81 ;771.6 770 .21%
retlw .73 ;856.2 852 .49%
retlw .73 ;856.2 852 .49%
retlw .73 ;856.2 852 .49%
retlw .90 ;694.4 697 .37%
retlw .81 ;771.6 770 .21%
retlw .73 ;856.2 852 .49%
retlw .66 ;947.0 941 .63%
retlw .66 ;947.0 941 .63%
retlw .66 ;947.0 941 .63%

F_High_table
addwf PCL,F
;X Actual Desired %Error
retlw .47 ;1329.8 1336 .47%
retlw .52 ;1201.9 1209 .59%
retlw .47 ;1329.8 1336 .47%
retlw .42 ;1488.1 1477 .75%
retlw .52 ;1201.9 1209 .59%
retlw .47 ;1329.8 1336 .47%
retlw .42 ;1488.1 1477 .75%
retlw .52 ;1201.9 1209 .59%
retlw .47 ;1329.8 1336 .47%
retlw .42 ;1488.1 1477 .75%
retlw .38 ;1644.7 1633 .72%
retlw .38 ;1644.7 1633 .72%
retlw .38 ;1644.7 1633 .72%
retlw .38 ;1644.7 1633 .72%
retlw .52 ;1201.9 1209 .59%

DAC_dtmf.asm Source Code

 2004 Microchip Technology Inc. DS51523A-page 35

retlw .42 ;1488.1 1477 .75%
endif

if _16_steps & Fosc_8000000
;
;*************************************************************************
;
; Delay Calculation for Frequency Generation
; Fosc = 8MHz #steps = 16
;
; X = Fosc / ( 4 * #steps * Ftone)
;
;
F_Low_table
addwf PCL,F
;X Actual Desired %Error
retlw .133 ;939.8 941 .12%
retlw .179 ;698.3 697 .19%
retlw .179 ;698.3 697 .19%
retlw .179 ;698.3 697 .19%
retlw .162 ;771.6 770 .21%
retlw .162 ;771.6 770 .21%
retlw .162 ;771.6 770 .21%
retlw .147 ;850.3 852 .19%
retlw .147 ;850.3 852 .19%
retlw .147 ;850.3 852 .19%
retlw .179 ;698.3 697 .19%
retlw .162 ;771.6 770 .21%
retlw .147 ;850.3 852 .19%
retlw .133 ;939.8 941 .12%
retlw .133 ;939.8 941 .12%
retlw .133 ;939.8 941 .12%

F_High_table
addwf PCL,F
;X Actual Desired %Error
retlw .94 ;1329.8 1336 .47%
retlw .103 ;1213.6 1209 .37%
retlw .94 ;1329.8 1336 .47%
retlw .85 ;1470.6 1477 .43%
retlw .103 ;1213.6 1209 .37%
retlw .94 ;1329.8 1336 .47%
retlw .85 ;1470.6 1477 .43%
retlw .103 ;1213.6 1209 .37%
retlw .94 ;1329.8 1336 .47%
retlw .85 ;1470.6 1477 .43%
retlw .77 ;1623.4 1633 .59% ; may run out of tcy and be too slow
retlw .77 ;1623.4 1633 .59% ; may run out of tcy and be too slow
retlw .77 ;1623.4 1633 .59% ; may run out of tcy and be too slow
retlw .77 ;1623.4 1633 .59% ; may run out of tcy and be too slow
retlw .103 ;1213.6 1209 .37%
retlw .85 ;1470.6 1477 .43%
endif

if _16_steps & Fosc_3570000
;
;*************************************************************************
;
; Delay Calculation for Frequency Generation

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 36  2004 Microchip Technology Inc.

; Fosc = 3.57MHz #steps = 16
;
; X = Fosc / ( 4 * #steps * Ftone)
;
F_Low_table
addwf PCL,F
;X Actual Desired %Error
retlw .59 ;945.5 941 .47%
retlw .80 ;697.3 697 .04%
retlw .80 ;697.3 697 .04%
retlw .80 ;697.3 697 .04%
retlw .72 ;774.7 770 .72%
retlw .72 ;774.7 770 .72%
retlw .72 ;774.7 770 .72%
retlw .65 ;858.2 852 .65%
retlw .65 ;858.2 852 .65%
retlw .65 ;858.2 852 .65%
retlw .80 ;697.3 697 .04%
retlw .72 ;774.7 770 .72%
retlw .65 ;858.2 852 .65%
retlw .59 ;945.5 941 .47%
retlw .59 ;945.5 941 .47%
retlw .59 ;945.5 941 .47%

F_High_table
addwf PCL,F
;X Actual Desired %Error
retlw .42 ;1328.1 1336 .59%
retlw .46 ;1212.6 1209 .30%
retlw .42 ;1328.1 1336 .59%
retlw .38 ;1467.9 1477 .61%
retlw .46 ;1212.6 1209 .30%
retlw .42 ;1328.1 1336 .59%
retlw .38 ;1467.9 1477 .61%
retlw .46 ;1212.6 1209 .30%
retlw .42 ;1328.1 1336 .59%
retlw .38 ;1467.9 1477 .61%
retlw .34 ;1640.6 1633 .47%
retlw .34 ;1640.6 1633 .47%
retlw .34 ;1640.6 1633 .47%
retlw .34 ;1640.6 1633 .47%
retlw .46 ;1212.6 1209 .30%
retlw .38 ;1467.9 1477 .61%
endif

;*************************************************************************
; Tone Length Calculation
; How many high cycles does it take to meet the desired timeout?
;
; ToneLength = desired_length / (1/Freq_high)
;
if (ToneLength_150)
ToneLength_table
addwf PCL,F
retlw .200
retlw .181
retlw .200
retlw .222
retlw .181
retlw .200

DAC_dtmf.asm Source Code

 2004 Microchip Technology Inc. DS51523A-page 37

retlw .222
retlw .181
retlw .200
retlw .222
retlw .245
retlw .245
retlw .245
retlw .245
retlw .181
retlw .222
endif

if ToneLength_100
ToneLength_table
addwf PCL,F
retlw .134
retlw .121
retlw .134
retlw .148
retlw .121
retlw .134
retlw .148
retlw .121
retlw .133
retlw .148
retlw .163
retlw .163
retlw .163
retlw .163
retlw .121
retlw .148
endif

if ToneLength_50
ToneLength_table
addwf PCL,F
retlw .67
retlw .60
retlw .67
retlw .74
retlw .60
retlw .67
retlw .74
retlw .60
retlw .67
retlw .74
retlw .82
retlw .82
retlw .82
retlw .82
retlw .60
retlw .74
endif

;*************************************************************************
Tone ;The following Syncs the SINE wave and the Timer
;Initialize all registers for startup
movlw HIGH SINE_Table_7bit
movwf PCLATH
if _32_steps

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 38  2004 Microchip Technology Inc.

movlw .32
endif
if _16_steps
movlw .16
endif
movwf F_Low_Step
movwf F_High_Step
movlw 01Fh
movwf F_Low_Out
movwf F_High_Out
movf TMR0,W
movwf F_Low_Rolling
movwf F_High_Rolling
movlw 0Fh
andwf Key_Value,F
movf Key_Value,W
call F_Low_table
movwf F_Low
movf Key_Value,W
call F_High_table
movwf F_High
Repeat_tone ;Call here to repeat the tone for ToneLength
;The following inits the ToneLength delay reg’s
movf Key_Value,W
call ToneLength_table
movwf ToneLength

test_F_Low ;Low frequency tone loop timer
movf F_Low_Rolling,W
subwf TMR0,W ;result = time since last update
subwf F_Low,W ;Carry bit determines if enough time has elapsed
btfsc STATUS,C
goto test_F_High ;do not update the SINE wave yet
movf F_Low,W
addwf F_Low_Rolling,F ;Very Important to add to the last reference
;instead of using the actual timer value
decfsz F_Low_Step,F ;update the step count
goto no_reset_F_Low_Step
if _32_steps
movlw .32
endif
if _16_steps
movlw .16
endif
movwf F_Low_Step
no_reset_F_Low_Step
movf F_Low_Step,W
call SINE_Table_7bit ;fetch the corresponding Sin value
movwf F_Low_Out ;store result

test_F_High ;High frequency tone loop timer
movf F_High_Rolling,W
subwf TMR0,W ;result = time since last update
subwf F_High,W ;Carry bit determines if enough time has elapsed
btfsc STATUS,C
goto update_output ;do not update the SINE wave yet
movf F_High,W
addwf F_High_Rolling,F ;Very Important to add to the last reference
;instead of using the actual timer value
decfsz F_High_Step,F ;update the step count

DAC_dtmf.asm Source Code

 2004 Microchip Technology Inc. DS51523A-page 39

goto no_reset_F_High_Step
if _32_steps
movlw .32
endif
if _16_steps
movlw .16
endif
movwf F_High_Step
;ToneLength timer
decfsz ToneLength,F
goto no_reset_F_High_Step
;ToneLength time expired, Exit subroutine
retlw 00h

no_reset_F_High_Step
movf F_High_Step,W
call SINE_Table_7bit ;fetch the corresponding Sin value
movwf F_High_Out ;store result

update_output ;Sum the 2 7-bit SINE outputs & refresh the D/A converter
;We can output one frequency at a time for test purposes
;w/o changing any timing! (Notice the sine wave quality)
movf F_High_Out,W ;comment this line for Low frequency Only
; addwf F_High_Out,W ;uncomment this line for High frequency Only

; movf F_Low_Out,W ;uncomment this line for Low frequency Only
addwf F_Low_Out,W ;comment this line for High frequency Only
movwf DTMF_Out
xorwf DAC_LSB,W
btfsc STATUS,Z ; nothing changed so continue looping
goto test_F_Low

; movf DTMF_Out,W ; Use this if seeking an 8b result
; movwf PORTB ; Use this if R2R on PortB
; movwf CCPR1L ; Use this if utilizing a HW PWM... shifted R for speed.
swapf DTMF_Out,W ; Use this for L shift 8b -> 12b result
movwf DAC_LSB ; should mask the 4 LSBs... if we were getting picky
iorlw b’11110000’ ; Use this for 12b result , set DAC B, Vref Buffered,
; 1x Gain
movwf DAC_MSB ; Use this for 12b result, otherwise let it default to
; preload
call WriteToMCP492X ; takes 30 Tcy using HW SPI
goto test_F_Low

tone_done

end

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 40  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 41

Appendix E. MixedSignal_16f767i.lkr Source Code

TABLE E-1: MIXEDSIGNAL_16F767I.LKR

// Sample ICD2 linker command file for 16F767
LIBPATH .

CODEPAGE NAME=vectors START=0x0 END=0x3 PROTECTED
CODEPAGE NAME=interrupt START=0x4 END=0x0FF
CODEPAGE NAME=page0_1 START=0x100 END=0x1FF
CODEPAGE NAME=page0_2a START=0x200 END=0x22F
CODEPAGE NAME=page0_2b START=0x230 END=0x2FF
CODEPAGE NAME=page0_3 START=0x300 END=0x3FF
CODEPAGE NAME=page0_4 START=0x400 END=0x4FF
CODEPAGE NAME=page0_5 START=0x500 END=0x5FF
CODEPAGE NAME=page0_6_7 START=0x600 END=0x7FF
CODEPAGE NAME=page1 START=0x800 END=0xFFF
CODEPAGE NAME=page2 START=0x1000 END=0x17FF
CODEPAGE NAME=page3 START=0x1800 END=0x1EFF
CODEPAGE NAME=debug START=0x1F00 END=0x1FFF PROTECTED
CODEPAGE NAME=.idlocs START=0x2000 END=0x2003 PROTECTED
CODEPAGE NAME=.test_vect START=0x2004 END=0x2005 PROTECTED
CODEPAGE NAME=.device_id START=0x2006 END=0x2006 PROTECTED
CODEPAGE NAME=.config START=0x2007 END=0x2009 PROTECTED
CODEPAGE NAME=.test START=0x200A END=0x203F PROTECTED

DATABANK NAME=sfr0 START=0x0 END=0x1F PROTECTED
DATABANK NAME=sfr1 START=0x80 END=0x9F PROTECTED
DATABANK NAME=sfr2 START=0x100 END=0x10F PROTECTED
DATABANK NAME=sfr3 START=0x180 END=0x18F PROTECTED

DATABANK NAME=gpr0 START=0x20 END=0x5F
DATABANK NAME=DTMF START=0x60 END=0x6F
DATABANK NAME=gpr1 START=0xA0 END=0xEF
DATABANK NAME=gpr2 START=0x110 END=0x164
DATABANK NAME=dbgspr2 START=0x165 END=0x16F PROTECTED
DATABANK NAME=gpr3 START=0x190 END=0x1EF

SHAREBANK NAME=dbgspr START=0x70 END=0x70 PROTECTED
SHAREBANK NAME=dbgspr START=0xF0 END=0xF0 PROTECTED
SHAREBANK NAME=dbgspr START=0x170 END=0x170 PROTECTED
SHAREBANK NAME=dbgspr START=0x1F0 END=0x1F0 PROTECTED

Software License Agreement

The software supplied herewith by Microchip Technology Incorporated (the “Company”) is intended and supplied to you, the
Company’s customer, for use solely and exclusively with products manufactured by the Company.

The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved.
Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil
liability for the breach of the terms and conditions of this license.

THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATU­TORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICU­LAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR
SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 42  2004 Microchip Technology Inc.

SHAREBANK NAME=gprs START=0x71 END=0x7F
SHAREBANK NAME=gprs START=0xF1 END=0xFF
SHAREBANK NAME=gprs START=0x171 END=0x17F
SHAREBANK NAME=gprs START=0x1F1 END=0x1FF

SECTION NAME=RESET ROM=vectors // Reset vectors
SECTION NAME=INTERRUPT ROM=interrupt // ROM code space -interrupt
SECTION NAME=MAIN ROM=page0_1 // ROM code space
SECTION NAME=MODE0000 ROM=page0_2a // ROM code space
SECTION NAME=DTMF_SUB ROM=page0_2b // ROM code space
SECTION NAME=MODE0001 ROM=page0_3 // ROM code space
SECTION NAME=MODE1000 ROM=page0_4 // ROM code space
SECTION NAME=OPEN ROM=page0_5 // ROM code space
SECTION NAME=SUBROUTINES ROM=page0_6_7 // ROM code space
SECTION NAME=PROG1 ROM=page1 // ROM code space
SECTION NAME=PROG2 ROM=page2 // ROM code space
SECTION NAME=PROG3 ROM=page3 // ROM code space
SECTION NAME=IDLOCS ROM=.idlocs // ID locations
SECTION NAME=TEST_VECT ROM=.test_vect // Test vector
SECTION NAME=DEVICEID ROM=.device_id // Device ID
SECTION NAME=CONFIG ROM=.config // Configuration bits location
SECTION NAME=TEST ROM=.test // Test

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 43

Appendix F. DTMF Scope Captures

FIGURE F-1: DTMF Tone 0
(941 Hz, 1336 Hz).

FIGURE F-2: DTMF Tone 1
(697 Hz, 1209 Hz).

FIGURE F-3: DTMF Tone 2
(697 Hz, 1336 Hz).

FIGURE F-4: DTMF Tone 3
(697 Hz, 1477 Hz).

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 44  2004 Microchip Technology Inc.

FIGURE F-5: DTMF Tone 4
(770 Hz, 1209 Hz).

FIGURE F-6: DTMF Tone 5
(770 Hz, 1336 Hz).

FIGURE F-7: DTMF Tone 6
(770 Hz, 1477 Hz).

FIGURE F-8: DTMF Tone 7
(852 Hz, 1209 Hz).

FIGURE F-9: DTMF Tone 8
(852 Hz, 1336 Hz).

FIGURE F-10: DTMF Tone 9
(852 Hz, 1477 Hz).

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 45

Appendix G. Scope Probe Noise Captures

FIGURE G-1: Oscilloscope screen capture of V

OUT_B

using a standard scope probe and short

ground lead. This illustrates the noise picked up by the scope probe and ground lead.

FIGURE G-2: Oscilloscope screen capture of V

OUT_D

using the SMA connector and coaxial cable

directly to the scope. This is the same as Figure G-1, except the scope probe on V

OUT_B

is turned off.

This highlights how critical test connections are to properly evaluating the “real” noise in a system.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 46  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 47

Appendix H. Sine Wave and Filtered DTMF Scope Captures

FIGURE H-1: Mode1000b generates a 100 Hz, 32-step sine wave on V

OUT_C

using the TC132X.

FIGURE H-2: Mode0000b generates DTMF waveforms to repeatedly dial a phone number.
V

OUT_B

illustrates the MCP4922's unfiltered output while V

OUT_D

illustrates a simple low-pass filter's

ability to “clean” up the signal.

Mixed Signal PICtail™ Demo Board User’s Guide

DS51523A-page 48  2004 Microchip Technology Inc.

NOTES:

Mixed Signal PICtail™ Demo

Board User’s Guide

 2004 Microchip Technology Inc. DS51523A-page 49

Appendix I. MPLAB® IDE Screen Capture

FIGURE I-1: MPLAB® IDE v6.62 screen capture of an example project to build and debug the
included firmware. Note the required files in the project window and the two pre-defined Watch windows
that the user can open up.

DS51523A-page 50  2004 Microchip Technology Inc.

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