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.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
K
EE
L
OQ
, K
EE
L
OQ
logo, MPLAB, PIC, PICmicro, PICSTART,
PIC
32
logo, rfPIC and UNI/O are registered trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MXDEV, MXLAB, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip
Technology Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPLAB Certified
logo, MPLIB, MPLINK, mTouch, Octopus, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, Total Endurance,
TSHARC, UniWinDriver, WiperLock and ZENA are
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2010, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 978-1-60932-490-2
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC
®
MCUs and dsPIC
®
DSCs, K
EE
L
OQ
®
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.
DS39616D-page 2
2010 Microchip Technology Inc.
PIC18F2331/2431/4331/4431
28/40/44-Pin Enhanced Flash Microcontrollers with
nanoWatt Technology, High-Performance PWM and A/D
14-Bit Power Control PWM Module:
•
•
•
•
•
Up to 4 Channels with Complementary Outputs
Edge or Center-Aligned Operation
Flexible Dead-Band Generator
Hardware Fault Protection Inputs
Simultaneous Update of Duty Cycle and Period:
- Flexible Special Event Trigger output
Power-Managed Modes:
•
•
•
•
•
•
•
•
•
Run: CPU on, Peripherals on
Idle: CPU off, Peripherals on
Sleep: CPU off, Peripherals off
Ultra Low, 50 nA Input Leakage
Idle mode Currents Down to 5.8
A,
Typical
Sleep Current Down to 0.1
A,
Typical
Timer1 Oscillator, 1.8
A,
Typical, 32 kHz, 2V
Watchdog Timer (WDT), 2.1
A,
typical
Oscillator Two-Speed Start-up
- Fast wake from Sleep and Idle, 1
s,
typical
Motion Feedback Module:
• Three Independent Input Capture Channels:
- Flexible operating modes for period and
pulse-width measurement
- Special Hall sensor interface module
- Special Event Trigger output to other modules
• Quadrature Encoder Interface:
- 2-phase inputs and one index input from
encoder
- High and low position tracking with direction
status and change of direction interrupt
- Velocity measurement
Peripheral Highlights:
•
•
•
•
High-Current Sink/Source 25 mA/25 mA
Three External Interrupts
Two Capture/Compare/PWM (CCP) modules
Enhanced USART module:
- Supports RS-485, RS-232 and LIN/J2602
- Auto-wake-up on Start bit
- Auto-Baud Detect
High-Speed, 200 ksps 10-Bit A/D Converter:
•
•
•
•
•
•
•
Up to 9 Channels
Simultaneous, Two-Channel Sampling
Sequential Sampling: 1, 2 or 4 Selected Channels
Auto-Conversion Capability
4-Word FIFO with Selectable Interrupt Frequency
Selectable External Conversion Triggers
Programmable Acquisition Time
Special Microcontroller Features:
• 100,000 Erase/Write Cycle Enhanced Flash
Program Memory, Typical
• 1,000,000 Erase/Write Cycle Data EEPROM
Memory, Typical
• Flash/Data EEPROM Retention: 100 Years
• Self-Programmable under Software Control
• Priority Levels for Interrupts
• 8 x 8 Single-Cycle Hardware Multiplier
• Extended Watchdog Timer (WDT):
- Programmable period from 41 ms to 131s
• Single-Supply In-Circuit Serial Programming™
(ICSP™) via Two Pins
• In-Circuit Debug (ICD) via Two Pins:
- Drives PWM outputs safely when debugging
Flexible Oscillator Structure:
• Four Crystal modes up to 40 MHz
• Two External Clock modes up to 40 MHz
• Internal Oscillator Block:
- 8 user-selectable frequencies: 31 kHz to 8 MHz
- OSCTUNE can compensate for frequency drift
• Secondary Oscillator using Timer1 @ 32 kHz
• Fail-Safe Clock Monitor:
- Allows for safe shutdown of device if clock fails
Program Memory
Device
Data Memory
I/O
SSP
10-Bit
CCP
A/D (ch)
5
5
9
9
2
2
2
2
SPI
Y
Y
Y
Y
Slave EUSART
I
2
C™
Y
Y
Y
Y
Y
Y
Y
Y
Quadrature
Encoder
Y
Y
Y
Y
Flash # Single-Word SRAM EEPROM
(bytes) Instructions (bytes) (bytes)
8192
16384
8192
16384
4096
8192
4096
8192
768
768
768
768
256
256
256
256
14-Bit
Timers
PWM
8/16-Bit
(ch)
6
6
8
8
1/3
1/3
1/3
1/3
PIC18F2331
PIC18F2431
PIC18F4331
PIC18F4431
24
24
36
36
2010 Microchip Technology Inc.
DS39616D-page 3
ADI Reference Circuit
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