MCP401X/2X
Digital Potentiometer
Evaluation Board
User’s Guide
© 2005 Microchip Technology Inc.
DS51546B
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DS51546B-page ii
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Table of Contents
Preface ........................................................................................................................... 1
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 5
1.2 What is the MCP402X Digital Potentiometer Evaluation Board? ................... 5
1.3 What the MCP402X Digital Potentiometer Evaluation Board Kit Includes ..... 6
Chapter 2. Installation and Operation
2.1 Introduction ..................................................................................................... 7
2.2 PCB Description ............................................................................................. 7
2.3 Test and Operating Instructions ................................................................... 10
2.4 Firmware Description ................................................................................... 17
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 19
A.2 Schematic .................................................................................................. 20
A.3 MCP402X Board Layout – Top Layer + Silk-screen ................................. 21
A.4 MCP402X Board Layout – Bottom Layer ................................................. 21
A.5 MCP402X Board Layout – Top Silkscreen ............................................... 22
A.6 MCP402X Board Layout – Bottom Layer + Silk-screen
........................... 22
Appendix B. Bill Of Materials (BOM)
Appendix C. Using the BFMP Programmer to Power the Board
C.1 Powering the Board Using the BFMP Programmer ..................................... 25
Appendix D. Potential Programming Issue of the MCP402XEV
D.1 Introduction .................................................................................................. 27
Appendix E. 00066_MCP402XEV.ASM Source Code
E.1 Introduction .................................................................................................. 29
Worldwide Sales and Service .................................................................................... 42
© 2005 Microchip Technology Inc.
DS51546B-page iii
MCP401X/2X Evaluation Board User’s Guide
NOTES:
DS51546B-page iv
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Preface
NOTICE TO CUSTOMERS
All documentation becomes dated, and this manual is no exception. Microchip tools and
documentation are constantly evolving to meet customer needs, so some actual dialogs
and/or tool descriptions may differ from those in this document. Please refer to our web site
(www.microchip.com) to obtain the latest documentation available.
Documents are identified with a “DS” number. This number is located on the bottom of each
page, in front of the page number. The numbering convention for the DS number is
“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the
document.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP402X Digital Potentiometer Evaluation Board. Items discussed in this chapter
include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP402X Digital Potentiometer Evaluation
Board. The manual layout is as follows:
• Chapter 1. “Product Overview” – Important information about the MCP402X
Digital Potentiometer Evaluation Board.
• Chapter 2. “Installation and Operation” – Includes instructions on how to get
started with this evaluation board.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams for the MCP402X Digital Potentiometer Evaluation Board.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP402X Digital Potentiometer Evaluation Board.
• Appendix C. “Using the BFMP Programmer to Power the Board” – Shows
how to interface the BFMP board with the MCP402X Digital Potentiometer Evaluation Board.
• Appendix D. “Potential Programming Issue of the MCP402XEV” – Discusses
possible programming issues with Rev 1 and Rev 2 of the MCP402X Digital
Potentiometer Evaluation Board.
• Appendix E. “00066_MCP402XEV.ASM Source Code” – Provides information
about the application firmware, as well as the location of the source code.
© 2005 Microchip Technology Inc.
DS51546B-page 1
MCP401X/2X Evaluation Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
‘bnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Italic Courier New
0xnnnn
Square brackets [ ]
Curly brackets and pipe
character: { | }
Ellipses...
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A binary number where n is a
digit
A key on the keyboard
Click OK
Click the Power tab
‘b00100, ‘b10
File>Save
Press <Enter>, <F1>
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
A variable argument
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
file.o, where file can be
any valid filename
A hexadecimal number where 0xFFFF, 0x007A
n is a hexadecimal digit
Optional arguments
mcc18 [options] file
[options]
Choice of mutually exclusive errorlevel {0|1}
arguments; an OR selection
Replaces repeated text
var_name [,
var_name...]
Represents code supplied by void main (void)
user
{ ...
}
RECOMMENDED READING
This user's guide describes how to use the MCP402X Digital Potentiometer Evaluation
Board. The following Microchip documents are available and recommended as
supplemental reference resources.
MCP4011/2/3/4, “Low-Cost, 64-Step Volatile Digital POT in SOT-23” Data Sheet
(DS21978).
MCP4021/2/3/4, “Low-Cost NV Digital POT in SOT-23 with WiperLock™ Technology”
Data Sheet (DS21945).
PIC10F200/202/204/206, “6-Pin, 8-Bit Flash Microcontrollers” Data Sheet (DS41239)
DS51546B-page 2
© 2005 Microchip Technology Inc.
Preface
THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
•
•
•
•
•
Distributor or Representative
Local Sales Office
Field Application Engineer (FAE)
Technical Support
Development Systems Information Line
Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision B (December 2005)
• Updated to include MCP401X devices
• Enhancement of Operation Description
• Added Appendix C. “Using the BFMP Programmer to Power the Board” Programming the MCP402X Digital Potentiometer Evaluation Board
• Added Appendix D. “Potential Programming Issue of the MCP402XEV”- A
description of potential programming issues (and their solutions) with the
MCP402X Digital Potentiometer Evaluation Board
Revision A (April 2005)
• Initial Release of this Document
© 2005 Microchip Technology Inc.
DS51546B-page 3
MCP401X/2X Evaluation Board User’s Guide
NOTES:
DS51546B-page 4
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Chapter 1. Product Overview
1.1
INTRODUCTION
This chapter provides an overview of the MCP402X Digital Potentiometer Evaluation
Board and covers the following topics:
• What is the MCP402X Digital Potentiometer Evaluation Board?
• What the MCP402X Digital Potentiometer Evaluation Board includes
1.2
WHAT IS THE MCP402X DIGITAL POTENTIOMETER EVALUATION BOARD?
The MCP402X Digital Potentiometer Evaluation Board (MCP402XEV) allows the
system designer to quickly evaluate the operation of Microchip Technology’s
MCP401X/2X Digital Potentiometer products.
The MCP402X Digital Potentiometer Evaluation Board PCB was designed to support:
•
•
•
•
•
•
•
•
8-pin, 150 mil SOIC MCP4021-XXX/SN devices
SOT-23-6 MCP4022-XXX/OT devices
SOT-23-6 MCP4023-XXX/OT devices
SOT-23-5 MCP4024-XXX/OT devices
8-pin, 150 mil SOIC MCP4011-XXX/SN devices
SOT-23-6 MCP4012-XXX/OT devices
SOT-23-6 MCP4013-XXX/OT devices
SOT-23-5 MCP4014-XXX/OT devices
In addition to supporting the MCP401X/2X, the MCP402XEV also utilizes the SOT-23-6
PIC10F20X microcontroller.
The PIC10F20X is supplied with example firmware that debounces the INCR and
DECR push buttons and generates the simple U/D protocol required by the
MCP401X/2X to increment and decrement the potentiometer’s wiper. It also generates
the simple U/D protocol required by the MCP402X to lock and unlock the
potentiometer’s wiper.
© 2005 Microchip Technology Inc.
DS51546B-page 5
MCP401X/2X Evaluation Board User’s Guide
1.3
WHAT THE MCP402X DIGITAL POTENTIOMETER EVALUATION BOARD KIT
INCLUDES
This MCP402X Digital Potentiometer Evaluation Board Kit includes:
• One populated Printed Circuit Board (PCB)
- MCP4021-103/OT
- PIC10F206-I/OT with 00066_MCP402XEV.HEX programmed into memory
- Two push button switches: one for Increment commands (INCR), one for
Decrement commands (DECR)
- Decoupling capacitors
- 5 resistors to isolate the switches and create a voltage divider with the
MCP4021-103/OT
• One blank PCB to allow rapid prototyping of a specific digital potentiometer
configuration
• 2 samples each of the MCP4021-202/OT, MCP4021-502/OT, MCP4021-103/OT
and MCP4021-503/OT
• 1 PIC10F20X-I/OT sample
• MCP401X/2X Digital Potentiometer Evaluation Board User’s Guide
(electronic version on CD) (DS51546)
DS51546B-page 6
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Chapter 2. Installation and Operation
2.1
INTRODUCTION
The MCP402X Digital Potentiometer Evaluation Board provides a tested,
out-of-the-box example of a MCP401X/2X application. The circuit description is
described in Section 2.2 “PCB Description”, while the test and operating instructions
are described in Section 2.3 “Test and Operating Instructions”. A supplied blank
PCB allows rapid prototyping of the designer’s specific MCP401X/2X device, along
with other desired passive components (resistor and capacitors) and connection posts.
2.2
PCB DESCRIPTION
The MCP402X Digital Potentiometer Evaluation Board has the following features:
•
•
•
•
150 mil, 8-pin SOIC pinout (U1) supports the MCP4021 and MCP4011 devices
SOT-23-6 pinout (U2) supports the MCP4022/23/24 and MCP4012/13/14 devices
SOT-23-6 pinout (U3) supports the PIC10F20X devices
Connection terminals can be left unpopulated for easy connection using small
alligator clip leads (clamped across the edge of the board) or populated with either
through-hole or surface-mount terminals
• Footprints for optional passive components for:
- Power supply filtering
- Device bypass capacitor
- Terminal “A” pull-up resistor
- Terminal “B” pull-down resistor
• Footprints for two switches:
- INCR button operation can be detected by the PIC10F20X to generate
Increment commands (move wiper toward terminal A)
- DECR button operation can be detected by the PIC10F20X to generate
Decrement commands (move wiper toward terminal B)
• Button sequence instructions are printed on the back of the PCB
Appendix A.2 “Schematic” illustrates the schematic for the MCP402XEV.
Note:
© 2005 Microchip Technology Inc.
The PIC10F20X firmware (00066_MCP402XEV.HEX) must be
programmed into the microcontroller before the MCP402XEV is functional.
DS51546B-page 7
MCP401X/2X Evaluation Board User’s Guide
2.2.1
Evaluating the MCP4021 and MCP4011
The MCP4021/11-XXXI/SN is an 8-pin digital potentiometer device with terminals A, B
and W available on the device pins. Footprint U1 supports the 150 mil SOIC package.
Resistors R2 and R3 are 2.5 kΩ on the populated PCB, along with the 10 kΩ
MCP4021-103I/SN digital potentiometer. This creates a “windowed” voltage divider
with a transfer function illustrated in Equation 2-1.
EQUATION 2-1:
WINDOWED POTENTIOMETER – VOLTAGE DIVIDER
CALCULATION
VDD ⋅ ( R wb + R3 ) 5.0V ⋅ ( ( d ⋅ 10k ) ⁄ 63 + 2.5k )
V wiper = ------------------------------------------- = --------------------------------------------------------------------R2 + R3 + R nom
2.5k + 2.5k + 10k
Where:
d = the wiper setting (0 to 63)
Note 1:
2:
2.2.2
DO NOT populate U2 if using U1.
The MCP4011 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
Evaluating the MCP4022 and MCP4012
The MCP4022/12-XXXI/OT is a 6-pin, stand-alone digital rheostat with terminals A and
W available on the device pins. Footprint U2 supports the SOT-23-6 package. An
“INCR” command moves the wiper toward terminal A, thus causing the resistance
across the rheostat to decrease. A “DECR” command moves the wiper toward terminal
B, thus causing the resistance across the rheostat to increase.
Note 1:
DS51546B-page 8
DO NOT populate U1 if using U2.
2:
The included MCP4021 digital potentiometer samples could be used to
evaluate the MCP4022 simply by not populating R3 and letting terminal
B float.
3:
The MCP4012 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
© 2005 Microchip Technology Inc.
Installation and Operation
2.2.3
Evaluating the MCP4023 and MCP4013
The MCP4023/13-XXXI/OT is a 6-pin, grounded digital potentiometer with terminals A
and W available on the device pins. Footprint U2 supports the SOT-23-6 package.
Populating R2 will create a voltage divider with a transfer function illustrated in
Equation 2-2.
EQUATION 2-2:
GROUNDED POTENTIOMETER – VOLTAGE DIVIDER
CALCULATION
V DD ⋅ Rwb 5.0V ⋅ ( d ⋅ 10k ⁄ 63 )
Vwiper = -------------------------- = ----------------------------------------------R2 + R nom
2.5k + 10k
Where:
d = the wiper setting (0 to 63)
Note 1:
DO NOT populate U1 if using U2.
2:
The included MCP4021 digital potentiometer samples could be used to
evaluate the MCP4023 simply by shorting terminal B to GND.
3:
The MCP4013 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
2.2.4
Evaluating the MCP4024 and MCP4014
The MCP4024/14-xxxI/OT is a 5-pin, grounded digital rheostat with the W terminals
available on the device pins. Footprint U2 supports the SOT-23-5 package. An “INCR”
command moves the wiper toward terminal A, thus causing the resistance across the
rheostat to increase. A “DECR” command moves the wiper toward terminal B, thus
causing the resistance across the rheostat to decrease.
Note 1:
© 2005 Microchip Technology Inc.
DO NOT populate U1 if using U2.
2:
The included MCP4021 digital potentiometer samples could be used to
evaluate the MCP4024 simply by not populating R2, letting terminal A
float and by shorting terminal B to GND.
3:
The MCP4014 has high-voltage tolerant pins and, therefore, accepts
high-voltage Increment and Decrement commands. Since this device is
nonvolatile, the WiperLock™ Technology feature is not present.
DS51546B-page 9
MCP401X/2X Evaluation Board User’s Guide
2.3
TEST AND OPERATING INSTRUCTIONS
The populated PCB is configured to create a voltage divider from VDD to VSS using a
2.5 kΩ pull-up resistor (R2), the MCP4021-103I/SN (10 kΩ) and a 2.5 kΩ pull-down
resistor (R3). To quickly evaluate the digital potentiometer’s performance, the following
test equipment is required:
• 2.7V to 5.5V power supply
• Voltmeter or Digital Multimeter (DMM)
Figure 2-1 shows the Digital Potentiometer Evaluation Board PCB, components and
the connection points that will be used in the step-by-step demonstration.
Increment (INCR)
Switch
Resistor R2
(A to VDD)
Baseline Flash MCU
Programmer (BFMP)
Interface
Resistor R3
(B to GND)
Decrement (DECR)
Switch
FIGURE 2-1:
DS51546B-page 10
Digital
Potentiometer
Node A Pad
Digital
Potentiometer
Node B Pad
Digital
Potentiometer
Wiper W Pad
Digital Potentiometer Evaluation Board Overview.
© 2005 Microchip Technology Inc.
Installation and Operation
2.3.1
Test Setup
1. Connect the power supply “+” to VDD and the “–” to GND.
2. Connect the voltmeter to the W terminal and GND.
The voltmeter should reflect the wiper setting with respect to Equation 2-3.
EQUATION 2-3:
POPULATED PCB – VOLTAGE DIVIDER CALCULATION
VDD ⋅ ( R wb + R3 ) 5.0V ⋅ ( ( d ⋅ 10k ) ⁄ 63 + 2.5k )
V wiper = ------------------------------------------- = --------------------------------------------------------------------R2 + R3 + R AB
2.5k + 2.5k + 10k
Where:
d = the wiper setting (0 to 63)
Using R2 and R3 = 2.5 kΩ:
• If a 2 kΩ MCP4021 is utilized, the output range will be approximately 1.79V to
3.21V.
• If a 5 kΩ MCP4021 is utilized, the output range will be approximately 1.25V to
3.75V.
• If a 10 kΩ MCP4021 is utilized, the output range will be approximately 0.83V to
4.17V.
• If a 50 kΩ MCP4021 is utilized, the output range will be approximately 0.23V to
4.77V.
© 2005 Microchip Technology Inc.
DS51546B-page 11
MCP401X/2X Evaluation Board User’s Guide
2.3.2
MCP402X Digital Potentiometer Evaluation Board Firmware
Operation
The 00066_MCP402XEV.HEX firmware programmed into the PIC10F20X provides a
very simple interface to operate the MCP402X digital potentiometer. There are ten
basic commands supported for the user to exercise the MCP402X digital
potentiometer.
Table 2-1 shows the firmware commands of the Digital Potentiometer Evaluation
Board.
DS51546B-page 12
© 2005 Microchip Technology Inc.
DECR
7
6:
Note 1:
2:
3:
4:
5:
64(4)
- (High Voltage)(6)
Yes
Yes
Yes
- (High
64(4)
Yes
- (Low Voltage)
Voltage)(6)
1(3)
- (High
Yes
1(3)
Voltage)(6)
- (Low Voltage)
1(3)
Yes
- (High
Yes
64(2)
Voltage)(6)
- (Low Voltage)
64(2)
Yes
1(1)
Yes
Yes
- (High Voltage)(6)
- (High
1(1)
1(1)
Voltage)(6)
- (Low Voltage)
# of
Steps
High Voltage on
No
CS and U/D pins?
Yes
No
Yes
Yes
No
Yes
No
Yes
Yes
After
Command
Wiper is
—
—
Yes
—
—
—
—
Yes
—
—
—
Yes
—
—
Yes
—
Yes
—
—
Yes
Yes
No
Yes
Yes
No
Yes
No
Yes
Yes
No
Works when
Wiper is “locked”
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
—
DECREMENT
(for > 2 sec)
—
DECREMENT
(for < 2 sec)
DECREMENT
(for < 2 sec)
—
#2
(Depress)(5)
—
DECR (for < 2 sec) INCR (for > 2 sec)
DECR (for > 2 sec)
DECR (for < 2 sec) INCR (for < 2 sec)
DECR (for < 2 sec) INCR (for < 2 sec)
DECR (for < 2 sec)
INCR (for < 2 sec)
INCR (for > 2 sec)
INCR (for < 2 sec)
INCR (for < 2 sec)
INCR (for < 2 sec)
#1
(Depress)(5)
Button Sequence
DECR
—
INCR
DECR
—
INCR
—
DECR
INCR
—
#3
(Release)
INCR
—
DECR
INCR
—
DECR
—
INCR
DECR
—
#4
(Release)
Move wiper W towards node A (Increment wiper 1 step).
Move wiper W to node A (Increment wiper 64 steps). Forces the wiper setting to “full-scale” (wiper W = node A).
Move wiper W towards node B (Decrement wiper 1 step).
Move wiper W to node B (Decrement wiper 64 steps). Forces the wiper setting to “zero scale” (wiper W = node B).
If there is more than one sequence, the button sequence #1 must continue to be held down while progressing to sequence #2. Example: Command # 2.
requires the INCR button to be depressed. Then, before 2 seconds elapses, the DECR button must be depressed. Next, before 2 seconds elapses, the INCR
button must be released. The DECR button can then be released.
High-voltage commands require a system voltage (VDD) greater than 5.0V to allow the simple charge pump to generate the VIHH MIN voltage for the CS pin.
DECR
DECR
6
10
INCR
5
DECR
INCR
4
DECR
INCR
3
9
INCR
2
8
INCR
Increment/Decrement (Low Voltage/High Voltage)
1
#
Saves Wiper
Value in EEPROM
Command
MCP401x will
INCR/DECR
DIGITAL POTENTIOMETER EVALUATION BOARD FIRMWARE INCREMENT/DECREMENT COMMANDS
“locked”
DS51546B-page 13
“unlocked”
TABLE 2-1:
MCP401X/2X Evaluation Board User’s Guide
© 2005 Microchip Technology Inc.
MCP401X/2X Evaluation Board User’s Guide
2.3.3
Running the Ratiometric Voltage Demo
Table 2-2 provides step-by-step instructions to perform a demonstration of the
MCP402X Digital Potentiometer Evaluation Board. Measuring Ratiometric Voltage
TABLE 2-2:
MEASURING RATIOMETRIC VOLTAGE
Step Action
Result
1
—
Power up the populated Digital Potentiometer
Evaluation Board.
Voltage calculations use a system voltage of 5V.
Board can be powered via a valid voltage (such as 5V)
on the VDD and GND PCB Pads, or by connecting a
BFMP programmer that is connected to an active PC’s
USB port (powered via the USB connection).
2
Set DMM to measure the required voltage range
(0V to 5.5V).
Connect the DMM ground connection to the
evaluation board GND terminal and the DMM V/Ω
connection to terminal W of the evaluation board.
—
3
Turn on DMM.
On DMM:
DMM will display the voltage determined by the
current non-volatile setting of the wiper.
4
On the Digital Potentiometer Evaluation Board:
Implement Command #5 (see Table 2-1).
On the Digital Potentiometer Evaluation Board:
WiperLock™ Technology is disabled and the wiper is
incremented from power-on position.
On DMM:
Voltage increments approximately 0.05V.
5
On the Digital Potentiometer Evaluation Board:
Implement Command #4 (see Table 2-1).
On the Digital Potentiometer Evaluation Board:
Wiper is forced to the full-scale position
(Wiper W = node A).
On DMM:
Voltage equals approximately 4.17V.
6
On the Digital Potentiometer Evaluation Board:
Implement Command #6 (see Table 2-1).
On the Digital Potentiometer Evaluation Board:
Wiper is decremented one position from the full-scale
position.
On DMM:
Voltage equals approximately 4.12V.
7
On the Digital Potentiometer Evaluation Board:
Implement Command #6 (see Table 2-1) 15 more
times.
On the Digital Potentiometer Evaluation Board:
Wiper is decremented to the 25% position from
node A (full-scale) to node B (zero-scale).
On DMM:
Voltage equals approximately 3.33V.
8
On the Digital Potentiometer Evaluation Board:
Turn off/disconnect power supply.
On DMM:
Voltage equals approximately 0V.
9
On the Digital Potentiometer Evaluation Board:
Reapply power to Digital Potentiometer Evaluation
Board.
On DMM:
Voltage equals approximately 3.33V. This shows that
the MCP4021 retained the last selected wiper setting.
10
On the Digital Potentiometer Evaluation Board:
Implement Command #3 (see Table 2-1).
On the Digital Potentiometer Evaluation Board:
Wiper is incremented one position and the wiper is
locked (WiperLock Technology is enabled).
On DMM:
Voltage equals approximately 3.38V.
DS51546B-page 14
© 2005 Microchip Technology Inc.
Installation and Operation
TABLE 2-2:
MEASURING RATIOMETRIC VOLTAGE (CONTINUED)
Step Action
Result
11
On the Digital Potentiometer Evaluation Board:
Wiper is NOT moved due to the wiper being locked
(WiperLock™ Technology is enabled).
On the Digital Potentiometer Evaluation Board:
Implement Command #1 (see Table 2-1).
On DMM:
Voltage equals approximately 3.38V.
12
On the Digital Potentiometer Evaluation Board:
Turn off/disconnect power supply.
On DMM:
Voltage equals approximately 0V.
13
On the Digital Potentiometer Evaluation Board:
Re-apply power to Digital Potentiometer Evaluation
Board.
On DMM:
Voltage equals approximately 3.38V. This shows that
the MCP4021 retained the last saved wiper setting.
© 2005 Microchip Technology Inc.
DS51546B-page 15
MCP401X/2X Evaluation Board User’s Guide
2.3.4
Wiper Voltages
Table 2-3 shows the relation between the wiper position and the voltage on the wiper
when 5.0 volts is applied to the MCP402X Digital Potentiometer Evaluation Board
where the resistors R2 and R3 are 2500Ω and the MCP4011 resistor value (RAB) is
10 kΩ. Equation 2-4 shows the formula for these calculations.
EQUATION 2-4:
CALCULATING THE VOLTAGE ON THE MCP402X DIGITAL
POTENTIOMETER EVALUATION BOARD
( R3 + ( Wiper Position • ( R AB ) ⁄ 63 ) )
Voltage at Wiper = System V DD • ----------------------------------------------------------------------------------------R3 + R AB + R2
Where:
System VDD = 5.0V
R2 = 2.5 kΩ
R3 = 2.5 kΩ
RAB = 10 kΩ
The typical step resistance for the 10 kΩ MCP4021 is approximately 158.73Ω. With a
5V supply and a 15 kΩ total resistance (2.5 kΩ + 2.5 kΩ + 10 kΩ), the delta voltage per
step is approximately 0.053V.
TABLE 2-3:
WIPER POSITION AND CORRESPONDING VOLTAGE
Wiper
Wiper
Wiper
Voltage
(V)
Position
Voltage
(V)
Position
Voltage
(V)
Position
00(1)
0.833
16
1.680
32
2.526
48
3.373
01
0.866
17
1.733
33
2.579
49
3.426
02
0.939
18
1.786
34
2.632
50
3.479
03
0.992
19
1.839
35
2.685
51
3.532
04
1.045
20
1.892
36
2.738
52
3.585
05
1.098
21
1.944
37
2.791
53
3.638
06
1.151
22
1.997
38
2.844
54
3.690
07
1.204
23
2.050
39
2.897
55
3.743
08
1.257
24
2.103
40
2.950
56
3.796
09
1.310
25
2.156
41
3.003
57
3.849
10
1.362
26
2.209
42
3.056
58
3.902
11
1.415
27
2.262
43
3.108
59
3.955
12
1.468
28
2.315
44
3.161
60
4.008
13
1.521
29
2.368
45
3.214
61
4.061
14
1.574
30
2.421
46
3.267
62
4.114
15
1.627
31
2.474
47
3.320
63(2)
4.167
Position
Note 1:
2:
DS51546B-page 16
Wiper
Voltage
(V)
This is zero-scale, wiper is connected to terminal B.
This is full-scale, wiper is connected to terminal A.
© 2005 Microchip Technology Inc.
Installation and Operation
2.4
FIRMWARE DESCRIPTION
The 000066_MCP402XEV.ASM source code was written using assembly language for
the PIC10F206 microcontroller. Refer to Appendix E. “00066_MCP402XEV.ASM
Source Code”. The firmware initializes its I/O so that it can poll the INCR and DECR
buttons every millisecond. If the button has been depressed for 40 out of 50 ms, it is
considered to be debounced and asserted. The button state is used to determine if a
new “Action State” is desired. This simple state machine then decodes the desired
action. Once the desired command has been determined, a subroutine that performs
the desired command is executed. The low-voltage commands are driven directly from
the PIC10F206 I/O, but the high-voltage commands require some additional hardware
to generate the required 8V signal.
When a high-voltage command is required, the PIC10F206’s unique OSCOUT feature
is utilized. The OSCOUT function allows the instruction clock to be driven on
GP2/OSCOUT under software control. A simple charge pump consisting of 2 – 0.01 µF
capacitors and a BAV99 dual diode is constructed as seen in Appendix
A.2 “Schematic”. When the OSCOUT is enabled, a 1 MHz clock drives the charge
pump that produces an 8.4V signal on the MCP401X/2X’s CS pin (assuming
VDD = 5.0V). Utilizing such a charge pump requires special attention to the timing of the
CS & U/D signals.
Refer to the comments in the 00066_MCP402XEV.ASM source code for more details
on the firmware’s operation. Refer to Appendix E. “00066_MCP402XEV.ASM Source
Code”.
© 2005 Microchip Technology Inc.
DS51546B-page 17
MCP401X/2X Evaluation Board User’s Guide
NOTES:
DS51546B-page 18
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layout diagrams for the MCP402X
Digital Potentiometer Evaluation Board.
• Schematic – Shows the schematic of the MCP402X Digital Potentiometer Evaluation Board. The populated PCB was built using this schematic.
• Board Layout – Top Layer + Silk-screen
• Board Layout – Top Silk-Screen
• Board Layout – Bottom Layer + Silk-screen
• Board Layout – Bottom Layer
© 2005 Microchip Technology Inc.
DS51546B-page 19
MCP401X/2X Evaluation Board User’s Guide
SCHEMATIC
M
A.2
DS51546B-page 20
© 2005 Microchip Technology Inc.
Schematic and Layouts
A.3
MCP402X BOARD LAYOUT – TOP LAYER + SILK-SCREEN
A.4
MCP402X BOARD LAYOUT – BOTTOM LAYER
© 2005 Microchip Technology Inc.
DS51546B-page 21
MCP401X/2X Evaluation Board User’s Guide
A.5
MCP402X BOARD LAYOUT – TOP SILK-SCREEN
A.6
MCP402X BOARD LAYOUT – BOTTOM LAYER + SILK-SCREEN
DS51546B-page 22
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Appendix B. Bill Of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS
Reference
Description
Manufacturer
®
Part Number
C0805C103K5RACTU
2
C1,C2,C3
Cap 0.01 µF 50V CERAMIC
X7R 0805
Kemet
1
C4
Cap .1 µF 25V CERAMIC
X7R 0805
Panasonic® Corporation –
ECG
ECJ-2VB1E104K
1
D1
Dual Diode, SOT-23-3,
May substitute with
Fairchild® BAV99
ON Semiconductor®
BAV99LT1
2
INCR, DECR
Switch LT Touch 6X3.5
100 GF SMD
Panasonic Corporation –
ECG
EVQ-PJS04K
1
J1
Conn Header 6pos .100 VERT TIN Molex®/Waldom®
Electronics Corp
(Optional)
22-28-4061
1
R1
Res 7.5 kΩ 1/10W 1%
0805 SMD
Panasonic Corporation –
ECG
ERJ-6ENF5111V
2
R2,R3
Res 2.5 kΩ 1/10W 1%
0805 SMD
Panasonic Corporation –
ECG
ERJ-6ENF5111V
2
R4,R5
Res 2.5 kΩ 1/10W 1%
0805 SMD
Panasonic Corporation –
ECG
ERJ-6ENF5111V
1
U1
MCP4021-103/SN 10 kΩ
Digital Potentiometer
Microchip Technology Inc.
MCP4021-103/SN
1
U3
PIC10F206, 6-Pin,
8-Bit Flash Microcontrollers
Microchip Technology Inc.
PIC10F206-I/OT
1
U2
MCP4022/23/24 5/6 Pin Digital
Potentiometer (Optional)
Microchip Technology Inc.
MCP4024-502/OT
7
A,B,W,VDD,GND,
U/D,CS
Test Point PC Compact SMT
(Optional)
Keystone® Electronics
5016
© 2005 Microchip Technology Inc.
DS51546B-page 23
MCP401X/2X Evaluation Board User’s Guide
NOTES:
DS51546B-page 24
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Appendix C. Using the BFMP Programmer to Power the Board
C.1
POWERING THE BOARD USING THE BFMP PROGRAMMER
The BFMP programmer (PG164101) uses a 6-pin interface for programming. The
PICkit™ 2 Flash Starter Kit (PG164120 or DV164120) uses the same interface.
The MCP402X Digital Potentiometer Evaluation Board (MCP402XEV) plugs into the
BFMP (or PICkit™ 2 Flash Starter Kit) in the orientation shown in Figure C-1.
USB Cable to PC
BFMP Header connector
MCP402XEV
Board
(Bottom-side)
BFMP Board
(Top-side)
Pin #1
FIGURE C-1:
Board.
© 2005 Microchip Technology Inc.
Pin #1
BFMP Hardware and MCP402X Digital Potentiometer Evaluation
DS51546B-page 25
MCP401X/2X Evaluation Board User’s Guide
These programmers use the PICkit™ 1 Baseline Flash Programmer software. This GUI
should be configured as shown in Figure C-2. Selecting Device Power causes the
BFMP to power the attached board all the time (not just during programming). This
allows the MCP402X Digital Potentiometer Evaluation Board to be easily demonstrated
without needing to carry a power supply (although a DMM is still required).
Select PIC10F206
FIGURE C-2:
Ensure Device Power IS checked and
2.5 kHz Osc is NOT checked.
PICkit™ 1 Baseline Flash Programmer - Configuration #2.
Note:
DS51546B-page 26
When programming the MCP402X Digital Potentiometer Evaluation Board,
under “Board Controls”, DO NOT check Device Power. This ensures that
the PIC10F206 is only powered during the programming cycle.
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Appendix D. Potential Programming Issue of the MCP402XEV
D.1
INTRODUCTION
When programming the MCP402XEV with a Microchip programmer (such as the BPMF
or MPLAB® ICD 2), the PIC10F206 may not program correctly due to the load on the
ICSPDAT pin. This issue relates to PCBs marked 104-00066 and 104-00066R2.
Due to the current path to ground that is present with the D1 and R1 components
through capacitor C2, the programming voltage on the ICSPDAT signal may not meet
the voltage requirements of the PIC10F206 GP1 pin.
To address this when programming the board, lift up one of the terminals of capacitor
C2 (see Figure D-1). This will stop the ICSPDAT signal voltage from being loaded down
while capacitor C2 is charging. The schematic is shown in Figure D-2.
After programming, capacitor C2 must be reconnected to the circuit. This is because
this circuit generates the high voltage for the high voltage commands.
This capacitor connection needs
to be opened for programming.
After programming has been
completed, this capacitor needs
to be reconnected in the circuit.
lift this end
FIGURE D-1:
MCP402XEV R2 PCB Layout – ECN #1.
© 2005 Microchip Technology Inc.
DS51546B-page 27
M
MCP401X/2X Evaluation Board User’s Guide
This is the node that needs to
be open when programming.
JP1
C2
FIGURE D-2:
DS51546B-page 28
MCP402XEV R2 Schematic PCB R2, ECN #1.
© 2005 Microchip Technology Inc.
MCP401X/2X EVALUATION
BOARD USER’S GUIDE
Appendix E. 00066_MCP402XEV.ASM Source Code
E.1
INTRODUCTION
This appendix documents the example PIC10F20X source code used on the populated
PCB. The source code is described in detail by the comments within the.ASM file. The
00066_MCP402XEV.ASM, PIC10F206.INC and MCP402XEV.HEX files can be found
on the Microchip web site (www.microchip.com) and on the included CD.
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.
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE
TITLE “MCP402XEV Firmware”
;********************************************************************************************
; Author:
Jim Simons
; Tools:
MPLAB(r) 7.10 using MPLINK(tm)
; Editor:
ComicSans 8pt w/8 character Tabs
; Files:
00066_MCP402XEV.asm
;
p10f206.inc
;
; Description: Exercise the MCP402x devices using the MCP402x EV board.
;
Simply use the INCR & DECR buttons to execute the INCR & DECR serial commands.
;
; Serial Commands
Action
State
; _______________
______
_____
; LV Increment w/EE
Depress UP, Release UP
LVwEE = 1
3
; LV Decrement w/EE
Depress DOWN, Release DOWN LVwEE = 1
4
; LV Increment w/o EE Depress UP, Release UP
LVwEE = x
3
; LV Decrement w/o EE Depress DOWN, Release DOWN LVwEE = x
4
; LV 64 Increments
Depress UP, Hold for 2s, Release UP
1
; LV 64 Decrements
Depress DOWN, Hold for 2s, Release DOWN
2
; HV Incr w/o WL
Depress UP, Depress DOWN, Release UP, Release DOWN
11
; HV Decr w/o WL
Depress DOWN, Depress UP, Release DOWN, Release UP
12
; HV 64 Incr w/o WL
Depress UP, Depress DOWN, Hold for 2s, Release UP, Release DOWN
5
; HV 64 Decr w/o WL
Depress DOWN, Depress UP, Hold for 2s, Release DOWN, Release UP
6
; HV Incr w/WL
Depress UP, Depress DOWN, Release DOWN, Release UP
13
; HV Decr w/WL
Depress DOWN, Depress UP, Release UP, Release DOWN
14
;
© 2005 Microchip Technology Inc.
DS51546B-page 29
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;**********************************************************************************************
; Connections/Schematic
;**********************************************************************************************
;
; MCP pin
MCP4021
MCP4022
MCP4023
MCP4024
; _______
_______
_______
_______
_______
; 1
Vdd
Vdd
Vdd
Vdd
; 2
Vss
Vss
Vss
Vss
; 3
A
U/D
U/D
U/D
; 4
W
CS
CS
CS
; 5
CS
W
W
W
; 6
B
A
A
; 7
; 8
U/D
;
; MCP402x
PIC10F206
Ext Components
; _______
_________
______________
; Vdd
Vdd
0.1uF - Vss
; Vss
Vss
; A
2.5k - Vdd
; W
; B
2.5k - Vss
; CS
GP0/ICSPDAT (int pu)
2.5k - DECR - Vss, 7.5k - CS & BAV99
; U/D
GP1/ICSPCLK (int pu)
2.5k - INCR - Vss
; GP2/OSCOUT
0.01uF - BAV99 - 0.01uF - Vss
; GP3/Vpp (int pu)
optional SW or Jumper put on BFMP header pins 4 & 6
;
;**********************************************************************************************
; Assemble Time Variables
SaveWiper
equ
1
; comment this line prevent LV commands from Saving the Wiper
;
;**********************************************************************************************
; Configure the PIC
;**********************************************************************************************
list
p=10F206
; list directive to define processor
#include <p10F206.inc> ; processor specific variable definitions
__CONFIG
_MCLRE_OFF & _CP_OFF & _WDT_ON
ERRORLEVEL -302
© 2005 Microchip Technology Inc.
DS51546B-page 30
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;**********************************************************************************************
; General Pupose Register Definitions
;**********************************************************************************************
GPRS
UDATA
State
res
1
; variable to track the “state” value
; this code functions as a state machine
; bits 3:0 stores the state 0-15 indicator
; bits 7:6 stores the debounced button states
OldState
res
1
; allows program to see if State changed
Exit
res
1
; variable to count the number ms to test for a button press
DebounceUP
res
1
; variable to count the number of ms UP was pressed
DebounceDOWN res
1
; variable to count the number of ms DOWN was pressed
DLYCNT1
res
1
; variable for the delay subroutines
DLYCNT2
res
1
; variable for the delay subroutines
#define
#define
#define
#define
#define
#define
UD
GPIO,1
CS
GPIO,0
UP
GPIO,1
DOWN
GPIO,0
CP
GPIO,2
PowerDown GPIO,3
#define
HV_CS
#define
#define
UP_State
State,7
DOWN_State State,6
;
;
;
;
;
;
OSCCAL,FOSC4
GP1 tied to UD & has “INCR” switch connected via 2.2k resistor
GP0 tied to CS & has “DECR” switch connected via 2.2k resistor
Momentary switch UP
Momentary switch DOWN
OSCOUT pin for Charge Pump
Vpp for programming & PowerDown input to put uC to SLEEP
; Drives CS to HVDD (drive CS high first)
; Debounced UP State - using bits 5:4 are critical
; Debounced DOWN State - using bits 5:4 are critical
;***********************************************************************************************
; Reset Code
;***********************************************************************************************
RESET
CODE
; processor reset vector + 1
;ResetVector
; Device resets to 0x1FF to get the factory calibration
goto
Start
; Lower half of memory reserved for subroutines
;***********************************************************************************************
; Main Code
;***********************************************************************************************
MAIN
CODE
Start
Init_Oscillator
; Internal RC calibration value is placed at location 0xFF by Microchip
; as a movlw k, where the k is a literal value.
movwf
OSCCAL
; update register with factory cal value
;
bcf
OSCCAL,FOSC4 ; make sure the FOSC4 is disabled to shut charge pump off
StateMachineReset
movlw
b’11110011’
; Disable the Comparator & make inputs digital
movwf
CMCON0
;
bcf
CMCON0, CMPON ; needs to be on to get GP2 as a General Purpose Output
movlw
b’10011010’
; disable Wake-Up on Pin Change,
; enable weak pullups for button inputs
; T0CS must be 0 for GP2 TRIS to be active
; set up for 72ms WDT
option
Init
clrf
State
clrf
OldState
call
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
© 2005 Microchip Technology Inc.
DS51546B-page 31
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
ButtonCheck
; Debounce Buttons
btfss
PowerDown
; If pulled low, put uC to SLEEP
goto
LowPowerMode
bsf
UP_State
bsf
DOWN_State
; initialize Button_State to indicate no button pressed
movlw
.50
; debounce the buttosns for 50mS to see if pressed
movwf
Exit
movlw
.40
; if pushed for 40 of 50 tests, then valid UP
movwf
DebounceUP
movwf
DebounceDOWN
DebounceLoop
call
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
movlw
.99
call
VAR5TcyDELAY ; 5 + (99*5) = 500us
btfss
UP
decfsz DebounceUP,f
goto
CheckDOWN
bcf
UP_State
; UP Button Pressed
CheckDOWN
call
GPIO_TestDOWN ; make GP0/DECR/CS an input (w/pu enabled)
movlw
.99
call
VAR5TcyDELAY ; 5 + (99*5) = 500us
btfss
DOWN
decfsz DebounceDOWN,f
goto
DebounceLoopTest
bcf
DOWN_State
; DOWN Button Pressed
DebounceLoopTest
decfsz Exit,f
goto
DebounceLoop
call
movf
call
movwf
xorwf
btfss
call
movlw
call
movf
movwf
goto
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
State,w
DetermineState
; subroutine to determine the next state
State
OldState,w
STATUS,Z
PerformState
;State changed, now do something
.5
VAR1000TcyDELAY
; Make sure EE Write Cycle has finished
State,w
OldState
ButtonCheck
; Loop for button presses
;***********************************************************************************************
; State Machine Code
;***********************************************************************************************
State0
goto
StateMachineReset ; State 0, no action, shouldn’t get here
State1
movlw
movwf
.200
Exit
© 2005 Microchip Technology Inc.
; UP button pressed
; 200x10mS = 2s
DS51546B-page 32
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
Loop1_2sec
call
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
movlw
.5
; 5ms delay
call
VAR1000TcyDELAY
btfss
DOWN
; if DOWN gets pressed, exit
retlw
.1
call
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
movlw
.5
; 5ms delay
call
VAR1000TcyDELAY
btfsc
UP
; if UP gets released, exit
retlw
.1
decfsz Exit,f
goto
Loop1_2sec
call
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
movlw
.64
call
LV_Increment
;
movlw
.4
;
call
VAR1000TcyDELAY
; add a 4mS delay for E/W cycle
call
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
LV_IncrExit
clrwdt
btfss
UP
; if UP gets released, exit
goto
LV_IncrExit
clrf
State
retlw
.1
State2
; DOWN button pressed
movlw
.200
; 200x10mS = 2s
movwf
Exit
Loop2_2sec
call
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
movlw
.5
; 5ms delay
call
VAR1000TcyDELAY
btfss
UP
; if UP gets pressed, exit
retlw
.2
call
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
movlw
.5
; 5ms delay
call
VAR1000TcyDELAY
btfsc
DOWN
; if DOWN gets released, exit
retlw
.2
decfsz Exit,f
goto
Loop2_2sec
call
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
undesired U/D commands
movlw
.64
call
LV_Decrement
;
movlw
.4
;
call
VAR1000TcyDELAY ; add a 4mS delay for E/W cycle
call
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
LV_DecrExit
clrwdt
btfss
DOWN
; if DOWN gets released, exit
goto
LV_DecrExit
clrf
State
retlw
.2
State3
; LV Increment
call
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
movlw
.1
call
LV_Increment
clrf
State
retlw
.3
© 2005 Microchip Technology Inc.
DS51546B-page 33
00066_MCP402XEV.ASM Source Code
TABLE E-1:
State4
call
movlw
call
clrf
retlw
State5
movlw
movwf
Loop5_2sec
call
movlw
call
btfsc
retlw
call
movlw
call
btfsc
retlw
decfsz
goto
call
movlw
call
;
movlw
;
call
HV_IncrExit
call
movlw
call
btfss
goto
call
movlw
call
btfss
goto
clrf
retlw
State6
movlw
movwf
Loop6_2sec
call
movlw
call
btfsc
retlw
call
movlw
call
btfsc
retlw
decfsz
goto
call
movlw
call
;
movlw
;
call
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
InitGPIO
.1
LV_Decrement
State
.4
.200
Exit
; LV Decrement
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
; Both buttons pressed
; 200x10mS = 2s
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
.5
; 5ms delay
VAR1000TcyDELAY
UP
; if UP gets released, exit
.5
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
.5
; 5ms delay
VAR1000TcyDELAY
DOWN
; if DOWN gets released, exit
.5
Exit,f
Loop5_2sec
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
.64
HV_Increment_WL_Disable
.4
VAR1000TcyDELAY ; add a 4mS delay for E/W cycle
clrwdt
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
.10
VAR1000TcyDELAY ; add a 10mS delay for settling time
DOWN
; if DOWN gets released, exit
HV_IncrExit
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
.10
VAR1000TcyDELAY ; add a 10mS delay for settling time
UP
; if UP gets released, exit
HV_IncrExit
State
.5
.200
Exit
; 200x10mS = 2s
GPIO_TestUP
; make GP1/INCR/UD an input (w/pu enabled)
.5
; 5ms delay
VAR1000TcyDELAY
UP
; if UP gets released, exit
.6
GPIO_TestDOWN
; make GP0/DECR/CS an input (w/pu enabled)
.5
; 5ms delay
VAR1000TcyDELAY
DOWN
; if DOWN gets released, exit
.6
Exit,f
Loop6_2sec
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
.64
HV_Decrement_WL_Disable
.4
VAR1000TcyDELAY
; add a 4mS delay for E/W cycle
© 2005 Microchip Technology Inc.
DS51546B-page 34
00066_MCP402XEV.ASM Source Code
TABLE E-1:
HV_DecrExit
call
movlw
call
btfss
goto
call
movlw
call
btfss
goto
clrf
retlw
State7
State8
State9
State10
State11
call
movlw
call
clrf
retlw
State12
call
movlw
call
clrf
retlw
State13
call
call
clrf
retlw
State14
call
call
clrf
retlw
State15
goto
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
clrwdt
GPIO_TestUP
.10
VAR1000TcyDELAY
UP
HV_DecrExit
GPIO_TestDOWN
.10
VAR1000TcyDELAY
DOWN
HV_DecrExit
State
.6
; make GP1/INCR/UD an input (w/pu enabled)
; add a 10mS delay for settling time
; if UP gets released, exit
; make GP0/DECR/CS an input (w/pu enabled)
; add a 10mS delay for settling time
; if DOWN gets released, exit
; HV Increment w/o WL
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD
.1
HV_Increment_WL_Disable
State
.11
; HV Increment w/o WL
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD
.1
HV_Decrement_WL_Disable
State
.12
; HV Decrement w/WL
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD
HV_Increment_WL_Enable
State
.13
; HV Decrement w/WL
InitGPIO
; make GP0/DECR/CS & GP1/INCR/UD
HV_Decrement_WL_Enable
State
.14
outputs, block undesired U/D commands
outputs, block undesired U/D commands
outputs, block undesired U/D commands
outputs, block undesired U/D commands
StateMachineReset
;***********************************************************************************************
; Low Power Mode
;***********************************************************************************************
LowPowerMode
movlw
b’11111000’
; make all I/O pins an output
tris
GPIO
movlw
b’11111111’
movwf
GPIO
; output high
movlw
b’10011111’
; disable Wake-Up on Pin Change,
; enable weak pullups for button inputs
; T0CS must be 0 for GP2 TRIS to be active
; set up for 2.3ms WDT
option
sleep
; put into lowest power setting
goto
Start
; shouldn’t get here
SUBS
CODE
© 2005 Microchip Technology Inc.
DS51546B-page 35
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;***********************************************************************************************
; State Machine Subroutines
;***********************************************************************************************
DetermineState
swapf
State,f
rrf
State,f
rrf
State,w
andlw
b’00111111’
; mask invalid states
addwf
PCL,f
S0_00
retlw
.0
; both buttons pressed at same time, shouldn’t be here
S0_01
retlw
.1
; UP button pressed, change state
S0_10
retlw
.2
; DOWN button pressed, change state
S0_11
retlw
.0
; no change
S1_00
retlw
.5
; both buttons pressed, change state
S1_01
retlw
.1
; no change
S1_10
retlw
.0
; shouldn’t be here, reset state
S1_11
retlw
.3
; UP button released, change state
S2_00
retlw
.6
; both buttons pressed, change state
S2_01
retlw
.0
; shouldn’t be here, reset state
S2_10
retlw
.2
; no change
S2_11
retlw
.4
; DOWN button released, change state
S3_00
retlw
.0
; shouldn’t be here, reset state
S3_01
retlw
.0
; shouldn’t be here, reset state
S3_10
retlw
.0
; shouldn’t be here, reset state
S3_11
retlw
.0
; shouldn’t be here, reset state
S4_00
retlw
.0
; shouldn’t be here, reset state
S4_01
retlw
.0
; shouldn’t be here, reset state
S4_10
retlw
.0
; shouldn’t be here, reset state
S4_11
retlw
.0
; shouldn’t be here, reset state
S5_00
retlw
.5
; no change
S5_01
retlw
.7
; DOWN button released, change state
S5_10
retlw
.9
; UP button released, change state
S5_11
retlw
.0
; shouldn’t be here, reset state
S6_00
retlw
.6
; no change
S6_01
retlw
.10
; DOWN button released
S6_10
retlw
.8
; UP button released
S6_11
retlw
.0
; shouldn’t be here, reset state
S7_00
retlw
.5
; both buttons pressed again, change state
S7_01
retlw
.7
; no change
S7_10
retlw
.0
; shouldn’t be here, reset state
S7_11
retlw
.13
; UP button released, change state
S8_00
retlw
.6
; both buttons pressed again, change state
S8_01
retlw
.0
; shouldn’t be here, reset state
S8_10
retlw
.8
; no change
S8_11
retlw
.14
; DOWN button released, change state
S9_00
retlw
.5
; both buttons pressed again, change state
S9_01
retlw
.0
; shouldn’t be here, reset state
S9_10
retlw
.9
; no change
S9_11
retlw
.11
; DOWN button released, change state
S10_00
retlw
.6
; both buttons pressed again, change state
S10_01
retlw
.10
; no change
S10_10
retlw
.0
; shouldn’t be here, reset state
S10_11
retlw
.12
; DOWN button released, change state
S11_00
retlw
.0
; shouldn’t be here, reset state
S11_01
retlw
.0
; shouldn’t be here, reset state
S11_10
retlw
.0
; shouldn’t be here, reset state
S11_11
retlw
.0
; shouldn’t be here, reset state
S12_00
retlw
.0
; shouldn’t be here, reset state
S12_01
retlw
.0
; shouldn’t be here, reset state
S12_10
retlw
.0
; shouldn’t be here, reset state
S12_11
retlw
.0
; shouldn’t be here, reset state
S13_00
retlw
.0
; shouldn’t be here, reset state
S13_01
retlw
.0
; shouldn’t be here, reset state
© 2005 Microchip Technology Inc.
DS51546B-page 36
00066_MCP402XEV.ASM Source Code
TABLE E-1:
S13_10
S13_11
S14_00
S14_01
S14_10
S14_11
S15_00
S15_01
S15_10
S15_11
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
retlw
retlw
retlw
retlw
retlw
retlw
retlw
retlw
retlw
retlw
.0
.0
.0
.0
.0
.0
.0
.0
.0
.0
;
;
;
;
;
;
;
;
;
;
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
shouldn’t
be
be
be
be
be
be
be
be
be
be
here,
here,
here,
here,
here,
here,
here,
here,
here,
here,
reset
reset
reset
reset
reset
reset
reset
reset
reset
reset
state
state
state
state
state
state
state
state
state
state
PerformState
movf
State,w
andlw
b’00001111’
; mask all states >15
addwf
PCL,f
; jump to desired State
retlw
.0
; State 0, no action
goto
State1
; (2s for repeating LV increment)
goto
State2
; (2s for repeating LV decrement)
goto
State3
goto
State4
goto
State5
; (2s for repeating HV increment)
goto
State6
; (2s for repeating HV decrement)
retlw
.7
; State 7, no action
retlw
.8
; State 8, no action
retlw
.9
; State 9, no action
retlw
.10
; State 10, no action
goto
State11
goto
State12
goto
State13
goto
State14
goto
StateMachineReset ; State 15... shouldn’t be here
;***********************************************************************************************
InitGPIO
movlw
b’00001011’
; initialize UP and DOWN switches to be high & CP to be low.
movwf
GPIO
movlw
b’11111100’
; make GP0/DECR/CS & GP1/INCR/UD outputs, block undesired U/D commands
tris
GPIO
retlw
b’11000000’
GPIO_TestUP
movlw
b’00001011’
; initialize UP and DOWN switches to be high & CP to be low.
movwf
GPIO
movlw
b’11111100’
; make both GP0/DECR/CS & GP1/INCR/UD outputs, prevent undesired U/D
commands
tris
GPIO
movlw
b’11111110’
; make GP1/INCR/UD an input (w/pu enabled)
tris
GPIO
retlw
b’10000000’
GPIO_TestDOWN
movlw
b’00001011’
; initialize UP and DOWN switches to be high & CP to be low.
movwf
GPIO
movlw
b’11111100’
; make both GP0/DECR/CS & GP1/INCR/UD outputs, prevent undesired U/D
commands
tris
GPIO
movlw
b’11111101’
; make GP0/DECR/CS an input (w/pu enabled)
tris
GPIO
retlw
b’01000000’
© 2005 Microchip Technology Inc.
DS51546B-page 37
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;***********************************************************************************************
; Button Isolation Subroutines
;***********************************************************************************************
; Low Voltage Increment & Decrement Subroutines
;***********************************************************************************************
LV_Increment
movwf
Exit
; load the loop counter
bsf
UD
goto
$+1
; creates a 3us total delay
bcf
CS
movlw
.100
; 5*100 = 500us delay to pull down CS
movwf
DLYCNT1
DLOOP_LVI
clrwdt
;or NOP
nop
decfsz
DLYCNT1,f
goto
DLOOP_LVI
LV_IncrLoop
bcf
UD
goto
$+1
bsf
UD
goto
$+1
; creates a 3us total delay
decfsz Exit,f
; Have we incremented the wiper enough?
goto
LV_IncrLoop
IFDEF SaveWiper
bcf
UD
goto
$+1
; creates a 3us total delay
ENDIF
bsf
CS
retlw
0x00
; Follow w/long delay to ramp CS & EEPROM Write Cycle
LV_Decrement
movwf
Exit
; load the loop counter
bcf
UD
goto
$+1
; creates a 3us total delay
bcf
CS
movlw
.100
; 5*100 = 500us delay to pull down CS
movwf
DLYCNT1
DLOOP_LVD
clrwdt
;or NOP
nop
decfsz DLYCNT1,f
goto
DLOOP_LVD
IFDEF SaveWiper
goto
LV_DecrLoop+4
; skip first Decrement since final edge is rising
ENDIF
LV_DecrLoop
bsf
UD
goto
$+1
; creates a 3us total delay
bcf
UD
goto
$+1
; creates a 3us total delay
decfsz Exit,f
; Have we decremented the wiper enough?
goto
LV_DecrLoop
IFDEF SaveWiper
bsf
UD
goto
$+1
; creates a 3us total delay
ENDIF
bsf
CS
; Follow w/long delay to ramp CS & EEPROM Write Cycle
retlw
0x01
© 2005 Microchip Technology Inc.
DS51546B-page 38
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;***********************************************************************************************
; High Voltage Increment & Decrement Subroutines
;***********************************************************************************************
HV_Increment_WL_Disable
movwf
Exit
; load the loop counter
bsf
UD
goto
$+1
; creates a 3us total delay
bsf
HV_CS
; starts 1Mhz Charge Pump
movlw
.100
; 5*100 = 500us delay for Charge Pump ramp time
movwf
DLYCNT1
DLOOP_HVI
clrwdt
;or NOP
nop
decfsz DLYCNT1,f
goto
DLOOP_HVI
HV_IncrLoop
bcf
UD
goto
$+1
; creates a 3us total delay
bsf
UD
goto
$+1
; creates a 3us total delay
decfsz Exit,f
; Have we incremented the wiper enough?
goto
HV_IncrLoop
bcf
HV_CS
; shut off 1Mhz Charge Pump
bcf
CS
; helps pull the signal down from HV
goto
$+1
bsf
CS
retlw
0x02
; Follow w/long delay to discharge pump & EEPROM Write Cycle
HV_Decrement_WL_Disable
movwf
Exit
bcf
UD
goto
$+1
bsf
HV_CS
movlw
.100
movwf
DLYCNT1
DLOOP_HVD
clrwdt
;or NOP
nop
decfsz DLYCNT1,f
goto
DLOOP_HVD
HV_DecrLoop
bsf
UD
goto
$+1
bcf
UD
goto
$+1
decfsz Exit,f
goto
HV_DecrLoop
bcf
HV_CS
bcf
CS
goto
$+1
bsf
CS
retlw
0x03
HV_Increment_WL_Enable
bsf
UD
goto
$+1
bsf
HV_CS
movlw
.100
movwf
DLYCNT1
© 2005 Microchip Technology Inc.
; load the loop counter
; creates a 3us total delay
; starts 1Mhz Charge Pump
; 5*100 = 500us delay for Charge Pump ramp time
; creates a 3us total delay
; creates a 3us total delay
; Have we decremented the wiper enough?
; shut off 1Mhz Charge Pump
; helps pull the signal down from HV
; Follow w/long delay to discharge pump & EEPROM Write Cycle
; creates a 3us total delay
; starts 1Mhz Charge Pump
; 5*100 = 500us delay for Charge Pump ramp time
DS51546B-page 39
00066_MCP402XEV.ASM Source Code
TABLE E-1:
DLOOP_HVIWL
clrwdt
nop
decfsz
goto
bcf
goto
bsf
goto
bcf
goto
bcf
bcf
goto
bsf
retlw
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;or NOP
DLYCNT1,f
DLOOP_HVIWL
UD
$+1
UD
$+1
UD
$+1
HV_CS
CS
$+1
CS
0x04
; creates a 3us total delay
; creates a 3us total delay
; creates a 3us total delay
; shut off 1Mhz Charge Pump
; helps pull the signal down from HV
; Follow w/long delay to discharge pump & EEPROM Write Cycle
HV_Decrement_WL_Enable
bcf
UD
bsf
CS
goto
$+1
; creates a 3us total delay
bsf
HV_CS
; starts 1Mhz Charge Pump
movlw
.100
; 5*100 = 500us delay for Charge Pump ramp time
movwf
DLYCNT1
DLOOP_HVDWL
clrwdt
;or NOP
nop
decfsz DLYCNT1,f
goto
DLOOP_HVDWL
bsf
UD
goto
$+1
; creates a 3us total delay
bcf
HV_CS
; shut off 1Mhz Charge Pump
bcf
CS
; helps pull the signal down from HV
goto
$+1
bsf
CS
retlw
0x05
; Follow w/long delay to discharge pump & EEPROM Write Cycle
;***********************************************************************************************
; VARIABLE DELAY SUBROUTINES
;***********************************************************************************************
;
DLYCNT1 = F9h = 249d
DLYCNT2 = W
;
DELAY = T((4 DLYCNT1 + 4) DLYCNT2 + 4)
;
; ex. To create a 300ms delay when using a 4Mhz osc, 300-250 = 50
;
movlw .50
;load .50 into WREG
;
call VAR1000TcyDELAY ;call VAR1000TcyDELAY = 50ms delay w/4MHz Osc
;
call VAR1000TcyDELAY ;call VAR1000TcyDELAY = 250ms delay w/4MHz Osc
;
;total = 300ms delay
;************
; The value in W at the time of the CALL = x. Delay = 1000Tcy*x
VAR1000TcyDELAY
movwf
DLYCNT2
; LOADS CONTROLLING DLY # INTO PRIMARY COUNTER
DLOOP2
movlw
.249
; MAXIMIZES THE SECONDARY DLY COUNTER
movwf
DLYCNT1
DLOOP1
clrwdt
;or NOP
decfsz DLYCNT1,f
; DECREMENT AND TEST SECONDARY LOOP FOR ZERO
goto
DLOOP1
; CONTINUE SECONDARY LOOP
decfsz DLYCNT2,f
; DECREMENT AND TEST PRIMARY DLY COUNTER
goto
DLOOP2
; CONTINUE PRIMARY LOOP
retlw
.250
; preload W for the next CALL VAR1000TcyDELAY
© 2005 Microchip Technology Inc.
DS51546B-page 40
00066_MCP402XEV.ASM Source Code
TABLE E-1:
00066_MCP402XEV.ASM SOURCE CODE (CONTINUED)
;************
;
VARIABLE 5 Tcy DELAY UP TO 256*5Tcy+5Tcy
;
DLYCNT1 = W
;
DELAY = T(1 + 5 DLYCNT1 - 1) + CALL + RETLW
;
; ex. To create a 250us delay, (250/5)-1 = 49
;
movlw
.49
;load .49 into WREG
;
call
VAR5TcyDELAY ;call VAR5TcyDELAY
;************
; The value in W at the time of the CALL = x. Delay = 5*Tcy + 5Tcy
VAR5TcyDELAY
movwf
DLYCNT1
; LOADS CONTROLLING DLY # INTO PRIMARY COUNTER
DLOOP3 clrwdt
;or NOP
nop
decfsz DLYCNT1,f
; DECREMENT AND TEST ZERO
goto
DLOOP3
; CONTINUE LOOP
retlw
.250
; preload W for the next CALL VAR5TcyDELAY
;***********************************************************************************************
end
© 2005 Microchip Technology Inc.
DS51546B-page 41
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Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
China - Xian
Tel: 86-29-8833-7250
Fax: 86-29-8833-7256
Malaysia - Penang
Tel: 60-4-646-8870
Fax: 60-4-646-5086
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
10/31/05
DS51546B-page 42
© 2005 Microchip Technology Inc.