Datenblatt für MCP6S2X Evaluation Board Users Guide von Microchip Technology

6‘ MICRDCHIP
2004 Microchip Technology Inc. DS51327B
MCP6S2X Evaluation Board (Rev. 4)
User’s Guide
QUALITY MANAGEMENT SYSTEM CERTIFIED BY DNV = ISO/TS 169492002 =
DS51327B-page ii 2004 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical
components in life support systems is not authorized except
with express written approval by Microchip. No licenses are
conveyed, implicitly or otherwise, under any intellectual
property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro,
PICSTART, PRO MATE, PowerSmart, rfPIC, and
SmartShunt are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
AmpLab, FilterLab, MXDEV, MXLAB, PICMASTER, 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, dsPICDEM,
dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR,
FanSense, FlexROM, fuzzyLAB, In-Circuit Serial
Programming, ICSP, ICEPIC, Migratable Memory, MPASM,
MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net,
PICLAB, PICtail, PowerCal, PowerInfo, PowerMate,
PowerTool, rfLAB, rfPICDEM, Select Mode, Smart Serial,
SmartTel and Total Endurance 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.
© 2004, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
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
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
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.
6‘ MICROCHIP
2004 Microchip Technology Inc. DS51327A-page iii
MCP6S2X Evaluation
Board (Rev.4) User’s Guide
Table of Contents
Preface ........................................................................................................1
Introduction................................................................................................ 1
About This Guide....................................................................................... 2
Recommended Reading............................................................................ 4
The Microchip Internet Web Site ............................................................... 4
Customer Support ..................................................................................... 5
Chapter 1. MCP6S2X Evaluation Board (Rev. 4)....................................7
1.1 Introduction ..................................................................................... 7
1.2 Evaluation Board Description ......................................................... 8
1.3 How it is used ................................................................................. 9
1.4 How it works ................................................................................. 10
Appendix A. Schematic and Board Layouts ....................................... 15
A.1 Introduction ................................................................................... 12
A.2 Schematic ................................................................................... 16
A.3 Top Silk Screen ........................................................................... 17
A.4 Top Metal Layer .......................................................................... 18
A.5 Ground Plane Layer .................................................................... 19
A.6 Power Plane Layer ...................................................................... 20
A.7 Bottom Metal Layer ..................................................................... 21
A.8 Bottom Silk Screen Layer (Top View) ......................................... 22
Appendix B. Bill of Materials (BOM) .................................................... 23
B.1 Introduction ................................................................................... 23
Appendix C. Evaluation Board Firmware ............................................ 25
‘MCPGSZX Evaluation Board (Rev.4) User’s Guide
MCP6S2X Evaluation Board (Rev.4) User’s Guide
DS51327A-page iv 2004 Microchip Technology Inc.
Appendix D. Setup Conditions............................................................. 29
D.1 DIP Switch Configurations (Stand-Alone Mode) ...........................29
D.2 Momentary Push Button Switch ....................................................30
D.3 SMA Connectors ...........................................................................30
D.4 Test Points ....................................................................................31
D.5 Reference Voltage Jumper positions ............................................31
Worldwide Sales and Service .................................................................32
6‘ MICROCHIP
MCP6S2X Evaluation Board
(Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 1
Preface
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP6S2X Evaluation Board (Rev. 4). Items discussed in this chapter include:
• About This Guide
• Warranty Registration
• Recommended Reading
• Troubleshooting
• The Microchip Web Site
• Development Systems Customer Change Notification Service
• 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.
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 2 2004 Microchip Technology Inc.
ABOUT THIS GUIDE
Document Layout
This document describes how to use MCP6S2X Evaluation Board (Rev. 4) as a devel-
opment tool to emulate and debug firmware on a target board. The manual layout is as
follows:
•Chapter 1: MCP6S2X Evaluation Board (Rev. 4) - this section describes how to
use the various features of the MCP6S2X Evaluation Board (Rev. 4).
•Appendix A: Schematic – shows the schematic and printed circuit board (PCB)
layout diagrams for the MCP6S2X Evaluation Board (Rev. 4).
•Appendix B: Bill of Materials (BOM) – shows the parts used to build the
MCP6S2X Evaluation Board (Rev. 4).
•Appendix C: Evaluation Board Firmware – shows the firmware for the
PIC16C505 source code used on the MCP6S2X Evaluation Board (Rev. 4).
•Appendix D: Setup Conditions – shows configuration tables for the DIP switch
settings and connections used for the MCP6S2X Evaluation Board (Rev. 4).
FIIe>Sa vs
Preface
2004 Microchip Technology Inc. DS51327B-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)
{ ...
}
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 4 2004 Microchip Technology Inc.
RECOMMENDED READING
This user's guide describes how to use MCP6S2X Evaluation Board (Rev. 4). Other
useful documents are listed below. The following Microchip documents are available
and recommended as supplemental reference resources.
MCP6S2X PGA Data Sheet (DS21117)
This data sheet provides detailed information regarding the MCP6S21/2/6/8 family of
PGAs.
THE MICROCHIP WEB SITE
Microchip provides online support via our WWW 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, 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
DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE
Microchip’s customer notification service helps keep customers current on Microchip
products. Subscribers will receive e-mail notification whenever there are changes,
updates, revisions or errata related to a specified product family or development tool of
interest.
To register, access the Microchip web site at www.microchip.com, click on Customer
Change Notification and follow the registration instructions.
The Development Systems product group categories are:
•Compilers – The latest information on Microchip C compilers and other language
tools. These include the MPLAB C17, MPLAB C18 and MPLAB C30 C compilers;
MPASM™ and MPLAB ASM30 assemblers; MPLINK™ and MPLAB LINK30
object linkers; and MPLIB™ and MPLAB LIB30 object librarians.
•Emulators – The latest information on Microchip in-circuit emulators.This
includes the MPLAB ICE 2000 and MPLAB ICE 4000.
•In-Circuit Debuggers – The latest information on the Microchip in-circuit
debugger, MPLAB ICD 2.
•MPLAB IDE – The latest information on Microchip MPLAB IDE, the Windows®
Integrated Development Environment for development systems tools. This list is
focused on the MPLAB IDE, MPLAB SIM and MPLAB SIM30 simulators, MPLAB
IDE Project Manager and general editing and debugging features.
•Programmers – The latest information on Microchip programmers. These include
the MPLAB PM3 and PRO MATE® II device programmers and the PICSTART®
Plus development programmer.
Preface
2004 Microchip Technology Inc. DS51327B-page 5
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
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 6 2004 Microchip Technology Inc.
NOTES:
6‘ MICROCHIP
MCP6S2X Evaluation Board
(Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 7
Chapter 1. MCP6S2X Evaluation Board (Rev. 4)
1.1 INTRODUCTION
The MCP6S21/2/6/8 family of Programmable Gain Amplifiers (PGA) is available with
one, two, six or eight signal input channels, respectively. The user can digitally select
a specific input channel and set the gain. This family of PGAs can be evaluated using
the MCP6S2X Evaluation Board (Rev. 4). The evaluation board schematic is shown in
Figure 1-1. This board uses the MCP6S21 and MCP6S26 to allow the user to connect
two signal sources to evaluate the PGAs. The 10 kΩ pull-up resistors provide noise
immunity for the PGA digital input pins.
FIGURE 1-1: MCP6S2X Evaluation Board (Rev. 4) simplified schematic.
VDD
CH5
CH4
CH3
CH2
CH1
CH0
VOUT
CS
SCK
SI
SO
VDD VDD
VREF
2.5V
ADJ. VREF
READ
JP1
RA3 RA5
RA2
RC0
RC1
RC2
RC3
RC4
RC5
VIN_1
VIN_0
VOUT_1
VOUT_2
PIC16F676
MCP6S26
MCP6S21
DIP Switch
VOUT
CH0
VREF CS
SCK
SI
Switch
VREF
RA1
RA0
ICSP™
VPP
VDD
GND
PGD
PGC
LVP
J6
Connector
Switch
20 kΩ
MCLR
VDD
470Ω
0.1 µF
JP2
J1
VDD
VDD Select
VDD
GND
10 kΩ
VDD
10 kΩ
VDD
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 8 2004 Microchip Technology Inc.
1.2 EVALUATION BOARD DESCRIPTION
The single-channel MCP6S21 and six-channel MCP6S26 have been selected for this
evaluation board. The PIC16F676 microcontroller is used to program the PGAs accord-
ing to the user inputs. User inputs are selected using the on-board DIP switch settings
that are configured according to the table printed on the evaluation board. This allows
the user to program the channel, gain and shutdown of each PGA. Either PGA or both
PGAs can be shut down. The six channels of the MCP6S26 and the PGA gains of 1, 2,
4, 5, 8, 10, 16 and 32 V/V can be configured. Refer to Appendix D.”Setup Conditions”,
for additional information.
When the momentary READ push button switch is pressed, the microcontroller reads
the DIP switch configuration through the I/O ports. The controller determines the proper
command and data bytes to be transmitted to the PGAs and the transmits a 16 or 32-bit
word through the Serial Peripheral Interface (SPI™) port.
When the momentary MCLR push button switch is pressed, the microcontroller Master
Clear is activated. This resets the microcontroller to a known initial state.
The ICSP connector provides the capability of programming the PIC16F676 from a PC.
This requires additional hardware, such as MPLAB® ICD 2.
The two PGAs are cascaded, while the signal output of the MCP6S26 is directly
connected to the analog input of the MCP6S21. This configuration outputs a maximum
signal gain of 1024 V/V.
The digital lines of the PGA are daisy chained. The MCP6S26 has a Serial-Out (SO)
line that can be used to serially program another device. Therefore, the SO line is con-
nected to the Serial-In (SI) line of the MCP6S21. If the MCP6S26 is removed from the
socket, the MCP6S21 cannot be programmed.
The MCP6S2X family of PGAs has a reference voltage input pin to offset the output
signal. There are three reference voltage options on the board: 2.5V, adjustable refer-
ence voltage (0V to 5V) and ground. These options can be selected using the on-board
jumper (JP1).
A prototype area is available for user circuit interface. The inputs, outputs and refer-
ence voltage traces of the PGAs conveniently pass near the prototype area for ease
of connection. Test point connectors are available to interface with external circuits.
The signals VIN_0, VIN_1, VOUT_1 and VOUT_2 can use SMA connectors that slide hor-
izontally onto the board. 50Ω termination resistors can be added to VIN_O and VIN_1.
Refer to Appendix A.”Schematic and Board Layouts” and Appendix D.”Setup
Conditions”, for additional information.
Do NOT
2004 Microchip Technology Inc. DS51327B-page 9
1.3 HOW IT IS USED
1.3.1 Application Procedure - Stand-Alone Mode
1. Apply a 2.5V to 5.5V supply voltage to the VDD and ground (GND) terminals of
J1. Place the VDD SELECT jumper (JP2) at the bottom (nearest J1).
For additional information on powering-up the MCP6S2X Evaluation Board (Rev.
4), refer to Section 1.4.2 “Applying Power”. During power-up, the MCP6S2X
PGA's default settings are Channel 0 (CH0) and gain = 1 V/V.
2. Connect a voltage-measuring device (such as an oscilloscope) to VOUT_1 for the
MCP6S26 and/or VOUT_2 for the MCP6S21.
3. Select the desired reference voltage using JP1. If the adjustable reference
voltage is selected, adjust this voltage using the potentiometer (ADJ_VREF). A
test point is available to measure the reference voltage.
Refer to Section 1.4.5 “Reference Voltage” for additional information.
4. Apply the input signal source at VIN_0 and/or VIN_1. VIN_0 is connected to
Channel 0 and VIN_1 is connected to Channel 1 of the MCP6S26 (refer to
Section 1.4.4 “Analog Interface”). Make sure that the input signal range is at
the proper level to avoid railing the amplifier output when the signal is gained.
Refer to Section 1.4.5 “Reference Voltage” for additional information.
5. Refer to the Table 1-1 and select the desired gain, channel or shutdown using the
on-board DIP switch. Press and release the READ push button switch to pro-
gram the PGA and notice the change in the output voltage. Refer to
Section 1.4.6 “Programming The PGA” for further explanation.
TABLE 1-1: DIP SWITCH CONFIGURATION TABLE
Note: If jumper JP2 is incorrectly placed, there may be a conflict between power
supplies.
Note: Do NOT use the ICSP connector while in this mode (disconnect the cable).
The results may be unpredictable and damage might occur due to
conflicting voltage sources.
Note: There are soldering pads available across each input terminal for termina-
tion resistors (R4 and R5). If these resistors (e.g., 50Ω) are needed for your
application, solder them across the pads.
Register MCP6S26
MSB → LSB MCP6S21
MSB → LSB
Gain 1 00000 01000
Gain 2 00001 01001
Gain 4 00010 01010
Gain 5 00011 01011
Gain 8 00100 01100
Gain 10 00101 01101
Gain 16 00110 01110
Gain 32 00111 01111
Channel 0 10000 —
Channel 1 10001 —
Channel 2 10010 —
Channel 3 10011 —
Channel 4 10100 —
Channel 5 10101 —
SHDN 11000 —
SHDN — 11001
SHDN 11010 11010
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 10 2004 Microchip Technology Inc.
1.3.2 Application Procedure - Program Mode
1. Place the VDD SELECT jumper (JP2) at the top (away from J1). The MPLAB
ICD 2 will provide 5V to the PGAs and to the microcontroller. Disconnect any
external power supply from J1.
2. Configure the MPLAB ICD 2 to provide power to the evaluation board through
the ICSP connector. This is accomplished by changing the MPLAB ICD 2
configuration in MPLAB IDE. The MPLAB ICD 2 needs to be powered by an
external power source.
3. Connect the MPLAB ICD 2 to the ICSP connector and update the PIC16F676
firmware from a PC using MPLAB ICD 2.
4. Follow steps 3 thru 5 in 1.3.1 “Application Procedure - Stand-Alone Mode”.
1.4 HOW IT WORKS
1.4.1 PGA Functions
The PGA has an internal precision operational amplifier in a non-inverting configura-
tion. The gain of this operational amplifier is set using resistive ladders in the feedback
loop. The resistor ratio is set using analog switches that are configured according to the
instructions stored in the memory registers.
The MCP6S21/2/6/8 family of PGAs provide various input channel options: one, two,
six or eight channel inputs, respectively. The non-inverting input of the internal preci-
sion operational amplifier is directly connected to the input channels through a multi-
plexer. The multiplexer is also configured according to the command stored in the
memory registers. Figure 1-2 shows a block diagram of the MCP6S26 with six input
channels. For the single-channel MCP6S21, the non-inverting input is directly con-
nected to the input pin without a multiplexer.
FIGURE 1-2: The six-channel MCP6S26 PGA Block Diagram. The
single-channel MCP6S21 does not have an input multiplexer.
Note: The ICSP™ connector can only be used to program the PIC16F676. In
order to debug the firmware, use the MPLAB ICD 2 header. Refer to the
MPLAB ICD 2 Header Installation Information (DS51292) for more
information.
Note: Do not change either of the manual push button switches (MCLR and
READ) while debugging the firmware. The results of this action would be
unpredictable, and may cause damage due to conflicting voltage sources.
VOUT
VREF
VDD
CS
SI
SO
SCK
CH1
CH0
CH3
CH2
CH5
CH4
VSS
8
RF
RG
MUX
SPI™
Logic
POR
Gain
Switches
Resistor Ladder (RLAD)
MCP6S26
2004 Microchip Technology Inc. DS51327B-page 11
1.4.2 Applying Power
The VDD SELECT jumper (JP2) connects the power plane (VDD) to either an external
power supply (through J1) or to MPLAB ICD 2 (via the ICSP connector (J6)). It selects
between two modes of operation:
1. Stand-Alone Mode - The MCP6S2X Evaluation Board (Rev. 4) is configured
using the on-board switches. Power is brought in to connector J1 from an exter-
nal supply and the VDD SELECT jumper selects J1. The external supply can be
between 2.5V and 5.5V. When the PIC16F676 is in a valid operating voltage, the
device will run the program stored in the device’s program memory (the
firmware).
2. Program Mode - The MCP6S2X Evaluation Board (Rev. 4) is connected to the
MPLAB ICD 2, which is connected to a PC. Power is brought in via the ICSP
connector and the VDD SELECT jumper selects the ICSP source. VDD is 5.0V.
The PIC16F676 firmware is reprogrammed by MPLAB IDE (application on PC).
1.4.3 Digital Interface
The memory registers are programmed using the SPI™ interface from a PIC16F676
microcontroller. The digital interface uses a standard 3-wire SPI protocol with Chip
Select (CS), Serial Clock (SCK) and Serial In (SI) lines. These lines are directly
connected to the MCP6S26 and have pull-up resistors. These pull-up resistors provide
noise immunity for the PGA from the PICmicro® microcontroller’s I/O pins. The two
PGAs are daisy chained with the SO pin from the MCP6S26 and connected to the SI
pin of the MCP6S21. The SCK and CS lines are also connected to the MCP6S21.
In order to program the MCP6S21 through the daisy chain, the microcontroller pulls CS
low and sends the 32-bit word through the SPI line. The first 16-bit word contains the
command and data bytes for the MCP6S21, while the next 16-bit word contains the
command and data bytes for the MCP6S26. The second 16-bit word can be zeros or a
NOP command. At the end of the 32nd clock cycle, the first 16-bit word is pushed out of
the MCP6S26 (through the SO line) and into the MCP6S21 (through the SI line). When
CS toggles high, the bytes are latched in the registers. Instructions in the registers are
then executed.
1.4.4 Analog Interface
The input channel 0 of the MCP6S26 is connected to VIN_0. The input channels 1, 2 and
3 are connected to VIN_1. Input channel 4 is connected to ground and input channel 5
is connected to the reference voltage. The user can connect two signal sources to
channel 0 and channel 1 at VIN_0 and VIN_1. .
The output pin of the MCP6S26 is connected to VOUT_1. This pin is also connected to
Channel 0 of the MCP6S21. The MCP6S21 can be used to gain the signal from the
MCP6S26 by gains of 1, 2, 4, 5, 8, 10, 16 and 32 V/V. If both PGAs are configured for
a gain of 32 V/V, the total signal gain is 1024 V/V. This illustrates the fact that the user
can cascade several PGAs to get higher gains. The output pin of the MCP6S21 is
connected to VOUT_2. The outputs of both PGAs are loaded with 10 kΩ resistors and
56 pF capacitors in parallel. These loads can be changed by the user.
Note: There are soldering pads available across each input terminal for termina-
tion resistors (R4 and R5). If these resistors (e.g., 50Ω) are needed for your
application, solder them across the pads.
Note: The signals VIN_0, VIN_1, VOUT_1 and VOUT_2 can be setup for test points
(surface-mount on top) or for SMA connectors (slide onto board
horizontally). Refer to Appendix D, D.3 “SMA Connectors” for more
information.
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 12 2004 Microchip Technology Inc.
1.4.5 Reference Voltage
The MCP6S2X Evaluation Board (Rev. 4) has three reference-voltage settings, as
shown in Figure 1-3. The MCP1525, a precision reference voltage device, is used to
provide a 2.5V reference. The minimum supply voltage for this device is 2.7V.
Therefore, this device will not operate when the evaluation board supply voltage (VDD)
is below 2.7V. An adjustable reference voltage (0V to 5V) is also available using a
mechanical potentiometer. Since the reference voltage input of the PGA requires a
low-impedance source, these reference voltages are buffered using the MCP6022, a
10 MHz operational amplifier. The PGA reference voltage input can also be connected
to ground. All of these options can be selected using the on-board jumper connector
JP1 (refer to Appendix D.”Setup Conditions” and D.5 “Reference Voltage Jumper
Positions” for more information).
FIGURE 1-3: Simplified Reference Voltage Schematic.
The input and output of this PGA can swing rail-to-rail (VDD and GND supply voltages).
However, in order to keep linearity, the output voltage should not exceed the Maximum
Output Voltage Swing, referred to in the electrical specifications of the MCP6S21/2/6/8
Data Sheet (DS21117). The reference voltage must be adjusted so that the maximum
output would not exceed the specified limit.
The PGA output voltage, with respect to the input and reference voltages, can be
determined using the following equation:
EQUATION 1-1:
VREF
JP1
VDD
1/2 MCP6022
VDD
1/2 MCP6022
VDD
VDD
10 kΩ
Pot.
+
+
-
-
MCP1525
Where: GMCP6S26 = gain of 1, 2, 4, 5, 8, 10, 16 or 32 V/V
GMCP6S21 = gain of 1, 2, 4, 5, 8, 10, 16 or 32 V/V
VIN_X = signal at the MCP6S26’s selected channel
VREF = Reference Voltage at VREF pin.
VOUT_1 GMCP6S26 VIN_X VREF
–()VREF
+=
VOUT_2 GMCP6S26 GMCP6S21
×VIN_X VREF
–()VREF
+=
2004 Microchip Technology Inc. DS51327B-page 13
1.4.6 Programming The PGA
The DIP switch lines are connected to the five microcontroller I/O lines (RA5, RA2,
RC0, RC1 and RC2) with pull-down resistors (Refer to Figure 1-1 and Appendix
A. “Schematic and Board Layouts”). The extreme top switch is the Most Significant
Bit (MSB) and the extreme bottom switch is the Least Significant Bit (LSB). Pushing the
switches right corresponds to the ‘1’, as shown on Table 1-1. Once the DIP switch is
configured to the desired setting, the READ push-button switch must be pressed and
released. When the button is released, the microcontroller reads the DIP switch
settings and transmits the corresponding command and data bytes to the PGAs. The
microcontroller remains in a loop to continuously monitor the READ push button switch.
Refer to Table 1-1 for the settings.
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 14 2004 Microchip Technology Inc.
NOTES:
6‘ MICROCHIP
MCP6S2X Evaluation
Board (Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 15
Appendix A. Schematic and Board Layouts
A.1 INTRODUCTION
This appendix contains the schematic and printed circuit board (PCB) layout diagrams
for the MCP6S2X Evaluation Board (Rev. 4).
A.1.1 Highlights
The MCP6S2X Evaluation Board (Rev. 4) is constructed using a four-layer PCB. The
top and bottom layers are for components and traces. The second layer is the ground
plane and the third layer is (VDD) the power plane.
Diagrams included in this appendix include:
•Schematic
• Top Silk Screen Layer
• Top Metal Layer
• Ground Plane Layer
• Power Plane Layer
• Bottom Metal Layer
• Bottom Silk Screen Layer
Note: The bottom metal layer (A.7) is missing a connection between pin 8 of the
PIC16F676 (U2 in A.2) and pin 6 of the DIP switch (DSW1 in A.2) and with
the pull-down resistor (R11). These traces have been corrected prior to
shipping by making a solder bridge between these pins.
W is”: H H h H
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 16 2004 Microchip Technology Inc.
A.2 SCHEMATIC
123456
A
B
C
D
6
54321
D
C
B
A
Title
Number RevisionSize
B
Date: 14-Jul-2004 Sheet of
File: C:\Protel Projects\Kumen Work\MCP6S2X Demo Bd\MCP682X Demo Db.ddbDrawn By:
Vout
1
CH0
2
Vref
3
Vss
4CS 5
SI 6
SCK 7
Vdd 8
U1
MC P6S21
C5
0.1uF
J1
FB1
C3
10µF/16V
VDDGND
R2
10K
C2 56pF
R4
49.9
R5
49.9
R1
10K
C1 56pF
VDD
MCP6S2X Demo Bd.
103-00018R4
A
1 2
43
SW1
READ
C13
0.1uF
VDD
C14
0.1uF
MICROCHIP LOGO
R10
10K
VDD
R18
10K
R17
10K
R16
10K
out A
1
-INA
2
+INA
3
Vss
4+INB 5
- INB 6
out B 7
Vdd 8
U4
MCP6022
Vi n
1Vout 3
Vss
2
U3
MCP1525
JP1
C12
0.1uF
C6
0.1uF
C11
2.2uF
C10
2.2uF
R8
100K
R7
100K
VR1
10K POT
VDD
C8
1.0 µF
C9
0.1 uF
R9
100K
MSB
LSB
R15
10K
R14
10K
R13
10K
R11
10K
R12
10K
VOUT 2
VOUT 1
VIN 0
VIN 1
VDD
VDD
1
2
3
4
56
7
8
9
9
10
OFFON
OFFON
OFFON
OFFON
OFFON
DSW1
VDD
1
0
C4
0.1uF
VDD
C7
0.1uF
VDD
Proto Area
Breadboard Area
Bypass Cap
Extra Test Points
VDD
Vout
1
CH0
2
CH1
3
CH2
4
CH3
5
CH4
6
CH5
7Vref 8
Vss 9
CS 10
SI 11
SO 12
SCK 13
Vdd 14
U5
MC P6S26
C16
0.1uF
PROTOAREA1
PROTOAREA SMA 6X6
PROTOAREA2
PROTOAREA SMA 6X6
PROTOAREA3
PROTOAREA SMA 6X6
PROTOAREA4
PROTOAREA SMA 6X6
TP6
TP7
TP11
SCK
TP12
CS
TP16
TP17
TP19
SI_1
TP20
VREF
PGC
5PGD
4GND
3VDD
2VPP
1
LV P
6
J6
ICSP CONNECTOR
TP18
SI_2
TP15
TP14
16F676
VDD
1
RA5
2
RA4
3
RA3
4
RC5
5
RC4
6
RC3
7RC2 8
RC1 9
RC0 10
RA2 11
RA1 12
RA0 13
Vss 14
U2
PIC16F676
TP5
JP2
VDD
R6
20K
R3
10K
C18
0.1uF
R19
10k
R20
470
1 2
43
SW2
MCLR
SELECT
VDD
2.5V
Adj _Vr ef
Gnd
W UOUT 2 UOUT l m E U1 CH N c1|:| |:| H' a) m D 2. 59 E “J ncpsszl GND (:13 x DE %L_Ju m um C2R2 ._. |—‘ Ad' 0) z UDD ‘37 UrJef U 0|:le g 9171: CD UREF “18‘: E R5 [:3 ._- J6 I‘1CP6826 ._. UDD HSB MED: 133738 8 I: :5, o S E H 0\ 08m 31. L88 : GND
2004 Microchip Technology Inc. DS51327B-page 17
A.3 TOP SILK SCREEN
lullslatfllit
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 18 2004 Microchip Technology Inc.
A.4 TOP METAL LAYER
OOOOOO Dooooo oomoooo O ODOOOOOO \J m o O 0 mo 00
2004 Microchip Technology Inc. DS51327B-page 19
A.5 GROUND PLANE LAYER
0000000 0 O O DOOOOOOO
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 20 2004 Microchip Technology Inc.
A.6 POWER PLANE LAYER
apoo tooooo ooanw, : E v 3 I 0 5.. 0 0 0 I 8 q A.
2004 Microchip Technology Inc. DS51327B-page 21
A.7 BOTTOM METAL LAYER
IOS-OOOISbé HCbQBSX EASI BQ' WICBOCHID QB C10 sflfifl L- n3 ea |:| S I L) [:l fil 4; ? JD Clan |:||:| Dom US 819 8;: an |:|a|:]m [:hm [:1819 Elm“ SUB mm
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 22 2004 Microchip Technology Inc.
A.8 BOTTOM SILK SCREEN LAYER (TOP VIEW)
6‘ MICROCHIP
MCP6S2X Evaluation
Board (Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 23
Appendix B. Bill of Materials (BOM)
B.1 INTRODUCTION
TABLE B-1: BILL OF MATERIALS
Reference Designator Qty Description Manufacturer Manufacturer Part
Number
C1,C2 2 Capacitor, 56 pF, 0805 Digi-Key PCC560CGCT
C3 1 Capacitor, 10 µF/16V, SMT Jameco 192997
C4-C7,C9,C12-C14,C16,
C18
10 Capacitor, 0.1 µF, 0805 Digi-Key PCC1828CT-ND
C8 1 Capacitor, 1.0 µF, 0805 Digi-Key PCC1849CT-ND
C10,C11 2 Capacitor, 2.2 µF, 0805 Digi-Key PCC1851CT-ND
C15, C17 Note 4 ——
DSW1 1 DIP Switch, DIP10 Digi-Key CKN1289-ND
FB1 1 Ferrite Chip, 0805 Digi-Key 240-1018-1-ND
J1 1 2-pin Terminal Block, Connector Digi-Key ED1623-ND
J2-J5 (Note 1) 0 SMA Board Connectors, Female Newark SPC10611
J6 1 ICSP™ Connector, 6x6 Jack, R/A Digi-Key A9049-ND
JP1 1 Jumper, 3x2 Jameco 115035
JP2 1 Jumper, 1x3 Jameco 109575
2 Shorting block for JP1, JP2 Jameco 152670
R1-R3,R10-R19 13 Resistor, 10 kΩ, 0805 Digi-Key P10.0KCCT-ND
R4,R5 (Note 2) 2 Resistor, 49.9 Ω, 0805 Digi-Key P49.9CCT-ND
R6 1 Resistor, 20 kΩ, 0805 Digi-Key P20.0KCCT-ND
R7-R9 3 Resistor, 100 kΩ, 0805 Digi-Key P100KCCT-ND
R20 1 Resistor, 470 Ω, 0805 Digi-Key P475CCT-ND
SW1,SW2 2 Momentary push button switch Digi-Key SW400-ND
TP5-TP7, TP11, TP12,
TP18-TP20
8 Testpoint, SMT Digi-Key 5016K-ND
TP14-TP17 (Note 3) 4 Testpoint, SMT Digi-Key 5016K-ND
TP1-TP4, TP8-TP10, TP13 Note 4 ——
U1 1 MCP6S21, PDIP-8 Microchip
Technology Inc.
MCP6S21
U2 1 PIC16F676, PDIP-14 Microchip
Technology Inc.
PIC16F676
U3 1 MCP1525, SOT23-3 Microchip
Technology Inc.
MCP1525
U4 1 MCP6022, SOIC-8 Microchip
Technology Inc.
MC6022
U5 1 MCP6S26, PDIP-14 Microchip
Technology Inc.
MCP6S26
VR1 1 10 kΩ Potentiometer Digi-Key 3296W-103-ND
1 8-pin DIP socket (for U1) Jameco 51625
2 14-pin DIP socket (for U2, U5) Jameco 37196
Note 1: Optional; supplied by customer (use J2-J5 or TP14-TP17).
2: Optional; in kit of parts.
3: Optional; in kit of parts (use J2-J5 or TP14-TP17).
4: These capacitors and test points do not exist on the board; they are gaps in the numbering sequence.
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 24 2004 Microchip Technology Inc.
NOTES:
6‘ MICROCHIP
MCP6S2X Evaluation Board
(Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 25
Appendix C. Evaluation Board Firmware
;--------------------------------------------------------------------------
; This firmware is developed for the MCP6S2X PGA demo board.
;
; The firmware reads the user interface dip and push-button switch
; settings and programs the PGA accordingly.
;
;
; File name: pga_demo.asm
; Date: 08/09/04
; File Version: 1.00
;
; Programmer: MPLAB ICE 2
; File Required: PIC16F676.inc
;
; Demo Board:
; Name: MCP6S2X Eval. Bd.
; Number: 102-00018R4
; Rev.: R4
; PGAs: MCP6S21 (or MCP6S91), MCP6S26
;
; Author: Ezana Haile
; Company: Microchip Technology, Inc.
;
;--------------------------------------------------------------------------
ERRORLEVEL -302
ERRORLEVEL -305
#INCLUDE <P16F676.INC>
__CONFIG _MCLRE_ON & _WDT_OFF & _INTRC_OSC_NOCLKOUT & _PWRTE_OFF & _BODEN_OFF &
_CPD_OFF
; definitions
#DEFINE CS PORTC, 4 ; CHIP SELECT
#DEFINE SCK PORTC, 5 ; CLOCK
#DEFINE DO PORTC, 3 ; DATA OUT
#DEFINE PUSH PORTA, 0 ; READ PUSH BUTTON
#DEFINE SW1 PORTC, 2 ; SWITCH 1
#DEFINE SW2 PORTC, 1 ; SWITCH 2
#DEFINE SW3 PORTC, 0 ; SWITCH 3
#DEFINE SW4 PORTA, 2 ; SWITCH 4
#DEFINE SW5 PORTA, 5 ; SWITCH 5
#DEFINE PRG_GAIN B’01000000’ ; PROGRAM GAIN
#DEFINE PRG_CHANNEL B’01000001’ ; PROGRAM CHANNEL
#DEFINE PGA_SHDN B’00100000’ ; SHUTDOWN PGA
Software License Agreement
This software is supplied herewith by Microchip Technology Incorporated (the “Company”) is supplied to you, the
Company’s customer, for use solely and exclusively on Microchip’s products manufactured by the Company.
This 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.
THE 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 PUPORSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY
CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REA
-
SON WHATSOEVER.
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 26 2004 Microchip Technology Inc.
; reserve memory byte
CBLOCK 0X20
COUNTER, BUFFER
ENDC
;============================================================
;========== PROGRAM =============================
;============================================================
PGA_DEMO ; CODE NAME
ORG 0X00
GOTO START
START ORG 0X05
BCF STATUS, RP0 ; BANK 0
MOVLW H’07’
MOVWF CMCON ; DIGITAL I/O
BSF STATUS, RP0 ; BANK 1
CLRF ANSEL ; DIGITAL I/O
CLRF WPUA
MOVLW H’3F’
MOVWF TRISA ; SET PORT A AS INPUT
MOVLW H’07’ ; SET RC<5,4,3> OUTPUT AND RC<2,1,0> INPUT
MOVWF TRISC ; SET PORT C AS INPUT
BCF STATUS, RP0 ; BANK 0
READ BTFSC PUSH ; CHECK TO SEE IF THE READ BUTTON IS PRESSED
GOTO READ
RDING BTFSS PUSH ; WAIT UNTIL THE BUTTON IS RELEASED
GOTO RDING ; LOOP
BSF CS ; UNSELECT THE DEVICES
BCF DO ; KEEP THE DATAOUT (DO) LOW
BCF SCK ; SET CLOCK
CLRF BUFFER ; CLEAR BUFFER
BTFSC SW5
GOTO CHANNEL_SHDN ; DETERMINE IF IT’S FOR CHANNEL OR
; SHUTDOWN OTHERWISE PROGRAM GAIN
; PROGRAM THE GAIN OF PGA 1 (MCP6S26) OR PGA 2 (MCP6S21)
BTFSC SW4
GOTO PGA_2_GAIN ; DETERMINE THE DEVICE
PGA_1_GAIN
BCF CS ; SELECT PGA
MOVLW PRG_GAIN ; PROGRAM GAIN CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THROUGH SPI
CALL READ_SWITCH ; READ SWITCH SETTINGS
CALL BITBANG ; SEND IT THROUGH SPI AND PROGRAM PGA
BSF CS ; UNSELECT THE DEVICES
GOTO READ
PGA_2_GAIN
BCF CS ; SELECT PGA
MOVLW PRG_GAIN ; PROGRAM GAIN CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THROUGH SPI AND PROGRAM PGA
CALL READ_SWITCH ; READ SWITCH SETTINGS
CALL BITBANG ; SEND IT THROUGH SPI
CLRF BUFFER ; SEND ZEROS TO PUSH OUT THE DATA TO PGA 2
CALL BITBANG ; SEND 8 DUMMY BITS
CALL BITBANG ; SEND 8 DUMMY BITS
BSF CS ; UNSELECT THE DEVICES
GOTO READ
; PROGRAM THE CHANNEL OR SHUTDOWN PGA 1 (MCP6S26) OR PGA 2 (MCP6S21)
CHANNEL_SHDN
BTFSC SW4
GOTO SHDN ; GOTO SHUTDOWN
CHANNEL
BCF CS ; SELECT PGA
MOVLW PRG_CHANNEL ; PROGRAM CHANNEL CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THROUGH SPI
CALL READ_SWITCH ; READ SWITCH SETTINGS
CALL BITBANG ; SEND IT THROUGH SPI AND PROGRAM PGA
2004 Microchip Technology Inc. DS51327B-page 27
BSF CS ; UNSELECT THE DEVICES
GOTO READ
SHDN
BTFSC SW3 ; IF THE 3RD SWITCH IS HIGH THEN DON’T SHUTDOWN
GOTO READ
BTFSC SW2 ; DETERMINE WHICH DEVICE
GOTO SHDN_BOTH ; SHUTDOWN BOTH PGAS
BTFSC SW1
GOTO SHDN_PGA_2 ; IF THE 1RD SWITCH IS HIGH THEN DON’T SHUTDOWN
SHDN_PGA_1 ; SHUTDOWN THE FIRST PGA
BCF CS ; SELECT PGA
MOVLW PGA_SHDN ; PROGRAM SHUTDOWN CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THROUGH SPI AND PROGRAM PGA
CALL BITBANG ; SEND 8 DUMMY BITS
BSF CS ; UNSELECT THE DEVICES
GOTO READ
SHDN_PGA_2 ; SHUTDOWN THE SECOND PGA
BCF CS ; SELECT PGA
MOVLW PGA_SHDN ; PROGRAM SHUTDOWN CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THROUGH SPI AND PROGRAM PGA
CALL BITBANG ; SEND 8 DUMMY BITS
CLRF BUFFER
CALL BITBANG ; SEND 8 DUMMY BITS
CALL BITBANG ; SEND 8 DUMMY BITS
BSF CS ; UNSELECT THE DEVICES
GOTO READ
SHDN_BOTH ; SHUTDOWN BOTH PGAs
BCF CS ; SELECT PGA
MOVLW PGA_SHDN ; PROGRAM SHUTDOWN CONFIGURATION
MOVWF BUFFER
CALL BITBANG ; SEND IT THRU SPI AND SHUTDOWN PGA
CALL BITBANG ; SEND 8 DUMMY BITS
CALL BITBANG ; SEND IT THRU SPI AND SHUTDOWN PGA
CALL BITBANG ; SEND 8 DUMMY BITS
BSF CS ; UNSELECT THE DEVICES
GOTO READ
;--------------------------------------------------------------------------
;--- READ THE SWITCH SETTINGS
;--------------------------------------------------------------------------
READ_SWITCH
CLRF BUFFER ; PROGRAM BUFFER FROM SWITCHES
BTFSC SW3 ; CHECK THE 3RD SWITCH
BSF BUFFER, 2
BTFSC SW2 ; CHECK THE 2RD SWITCH
BSF BUFFER, 1
BTFSC SW1 ; CHECK THE 1RD SWITCH
BSF BUFFER, 0
RETURN
;--------------------------------------------------------------------------
;---- BIT BANG SPI COMMUNICATION
;--------------------------------------------------------------------------
BITBANG
CLRC
MOVLW H’08’
MOVWF COUNTER ; SET THE BIT BANG COUNTER
SEND BTFSC BUFFER, 7 ; SEE THE LAST BIT OF THE BUFFER
BSF DO ; THE SWITCH IS SET, THEN SET THE BUFFER HIGH
BSF SCK ; SET CLOCK
BCF SCK ; CLEAR CLOCK
BCF DO ; CLEAR THE DATA
RLF BUFFER,F ; ROLL THE BITS
DECFSZ COUNTER, F ; CHECK END OF COUNTER
GOTO SEND ; LOOP
RETURN
;--------------------------------------------------------------------------
END
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 28 2004 Microchip Technology Inc.
NOTES:
6‘ MICROCHIP
MCP6S2X Evaluation
Board (Rev. 4) User’s Guide
2004 Microchip Technology Inc. DS51327B-page 29
Appendix D. Setup Conditions
D.1 DIP SWITCH CONFIGURATIONS (STAND-ALONE MODE)
TABLE D-1: DIP SWITCH CONFIGURATION FOR MCP6S21 ONLY
TABLE D-2: DIP SWITCH CONFIGURATION FOR MCP6S26 ONLY
TABLE D-3: DIP SWITCH CONFIGURATION FOR MCP6S21 AND MCP6S26
Register MCP6S21
MSB → LSB
Gain 1 01000
Gain 2 01001
Gain 4 01010
Gain 5 01011
Gain 8 01100
Gain 10 01101
Gain 16 01110
Gain 32 01111
SHDN (Shutdown) 11001
Register MCP6S26
MSB → LSB
Gain 1 00000
Gain 2 00001
Gain 4 00010
Gain 5 00011
Gain 8 00100
Gain 10 00101
Gain 16 00110
Gain 32 00111
Channel 0 10000
Channel 1 10001
Channel 2 10010
Channel 3 10011
Channel 4 10100
Channel 5 10101
SHDN (Shutdown) 11000
Register MCP6S21/MCP6S26
MSB → LSB
SHDN (Shutdown) 11010
MCP6S2X Evaluation Board (Rev. 4) User’s Guide
DS51327B-page 30 2004 Microchip Technology Inc.
D.2 MOMENTARY PUSH BUTTON SWITCH
D.2.1 Read Function
To change the PGA settings:
1. Stand-alone Mode - Configure the DIP Switch according to the tables in
Appendix D.1. Press and release the READ switch; the microcontroller
immediately updates the PGA's configuration.
2. Program Mode - The change in PGA configuration needs to be provided in
customer-supplied firmware.
D.2.2 Master Clear Function
To re-initialize the microcontroller:
1. Stand-alone Mode - Press and release the MCLR switch.
2. Program Mode - Do not use the MCLR switch. Disconnect from MPLAB ICD 2
and reconnect.
D.3 SMA CONNECTORS
The illustration below shows how the SMA connectors are slid onto the board at test
points VIN_0, VIN_1, VOUT_1, and VOUT_2. The round center conductor goes over the
test pad and two of the square lugs go underneath the board on the unmasked ground
fill (bottom metal). Solder the lugs and center conductor to the board.
FIGURE D-1: SMA Connectors.
top of board Board
round center conductor
square lugs (ground)
square lugs (ground)
SMA Connector and Board (side view)
2004 Microchip Technology Inc. DS51327B-page 31
D.4 TEST POINTS
TABLE D-4: TEST POINT CONNECTORS
D.5 REFERENCE VOLTAGE JUMPER POSITIONS
TABLE D-5: JUMPER POSITIONS
Name Reference
Designator Description
VIN_0 TP16 Input Voltage to Channel 0 (MCP6S26)
VIN_1 TP17 Input Voltage to Channel 1 (MCP6S26)
VOUT_1 TP15 Output Voltage from MCP6S26
(Input Voltage to MCP6S21)
VOUT_2 TP14 Output Voltage from MCP6S21
VREF TP20 Reference Voltage (for MCP6S26 and MCP6S21)
VDD TP6 Positive Supply Voltage
GND TP5, TP7 Ground (Negative Supply Voltage)
CS TP12 SPI™ Chip Select
SCK TP11 SPI Serial Clock
SI_1 TP19 SPI Serial Data In (MCP6S26)
SI_2 TP18 SPI Serial Data In (MCP6S21);
SPI Serial Data Out (MCP6S26)
Jumper Position Function
JP1 Top 2.5V
Middle Adjustable Reference Voltage
Bottom Ground
JP2 Top VDD supplied by ICSP™ Connector J6
Bottom VDD supplied by Terminal Block J1
Q ‘MICROCHIP
DS51327B-page 32 2004 Microchip Technology Inc.
AMERICAS
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
480-792-7627
Web Address:
www.microchip.com
Atlanta
Alpharetta, GA
Tel: 770-640-0034
Fax: 770-640-0307
Boston
Westford, MA
Tel: 978-692-3848
Fax: 978-692-3821
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
San Jose
Mountain View, CA
Tel: 650-215-1444
Fax: 650-961-0286
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
ASIA/PACIFIC
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: 86-28-8676-6200
Fax: 86-28-8676-6599
China - Fuzhou
Tel: 86-591-750-3506
Fax: 86-591-750-3521
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
China - Shanghai
Tel: 86-21-6275-5700
Fax: 86-21-6275-5060
China - Shenzhen
Tel: 86-755-8290-1380
Fax: 86-755-8295-1393
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
China - Qingdao
Tel: 86-532-502-7355
Fax: 86-532-502-7205
ASIA/PACIFIC
India - Bangalore
Tel: 91-80-2229-0061
Fax: 91-80-2229-0062
India - New Delhi
Tel: 91-11-5160-8632
Fax: 91-11-5160-8632
Japan - Kanagawa
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Kaohsiung
Tel: 886-7-536-4816
Fax: 886-7-536-4817
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Taiwan - Hsinchu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
EUROPE
Austria - Weis
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark - Ballerup
Tel: 45-4420-9895
Fax: 45-4420-9910
France - Massy
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Ismaning
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
England - Berkshire
Tel: 44-118-921-5869
Fax: 44-118-921-5820
WORLDWIDE SALES AND SERVICE
08/24/04