Saturday, September 29, 2007

EdSim51 - 8051 Simulator

A virtual 8051 is interfaced with virtual peripherals such as a keypad, motor, display, UART, etc. The student can write 8051 assembly code, step through the code and observe the effects each line has on the internal memory and the external peripherals.

EdSim51 - 8051 Simulator

The student can learn how to scan a keypad, multiplex 7-segment displays, control a motor and count its revolutions, etc.


A Note from the Developer - Jjames Rogers - ."While lecturing in electronics at IT Sligo, I searched the Internet for an 8051 simulator suitable for teaching but to no avail. I therefore decided to develop my own simulator for the basic 8051 with virtual peripherals attached to the four ports."

"After about a year's working on the project, on and off, the result was the EdSim51 simulator. I then put together a set of notes that are now the Beginner's Guide to the 8051on this website."

The Virtual Peripherals:
  • Analogue-to-Digital Converter (ADC)
  • Comparator, UART
  • 4 Multiplexed 7-segment Displays
  • 4 X 3 Keypad and 8 LEDs
  • DC Motor and 8 Switches
  • Digital-to-Analogue Converter (DAC) - displayed on oscilloscope

SG2525 - SG3525 - PWM SMPS Regulator Chip

SG2525 - SG3525 - PWM SMPS Regulator Chip. A second generation ic switch mode controller optimized for high frequency.

100kHz Half Bridge Convertor - SG3525

The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. Half Bridge, Push-Pull.

SG3525 usage in SMPS 500W - It was used in Parallel for Electroplating with a central Load sharing control between modules.

SG2525 - SG3525 - PWM SMPS Regulator Chip

Specs
  • 8.0 V to 35 V Operation
  • 5.1 V +/- 1.0% Trimmed Reference
  • 100 Hz to 400 kHz Oscillator Range
  • Separate Oscillator Sync Pin
  • Adjustable Deadtime Control
  • Input Undervoltage Lockout
  • Latching PWM to Prevent Multiple Pulses
  • Pulse-by-Pulse Shutdown
  • Dual Source/Sink Outputs: +/- 400 mA Peak
Circuits -

ICM7217 Device Information

ICM7217 Device Information

The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control.

This circuit provides multiplexed 7 segment LED display outputs, with common anode or common cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (common anode) at a 25% duty cycle. The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin.

  • Four Decade, Presettable Up-Down Counter with Parallel Zero Detect
  • Settable Register with Contents Continuously Compared to Counter
  • Directly Drives Multiplexed 7 Segment Common Anode or Common Cathode LED Displays
  • On-Board Multiplex Scan Oscillator
  • Schmitt Trigger On Count Input
  • TTL Compatible BCD I/O Port, Carry/Borrow, Equal, and Zero Outputs
  • Display Blank Control for Lower Power Operation; Quiescent Power Dissipation <5mW
  • All Terminals Fully Protected Against Static Discharge
  • Single 5V Supply Operation

delabs Notes-

This is another Intersil Masterpiece in days when using uP was complex and uC was not available.A 8085 could be used but with many supporting chips and it consumed power. This was a CMOS innovation low on power and just one ASIC had the fexibility for many digital operations.A ThumbWheel and Display Interface completed a Gadget.

Related Links

Friday, September 28, 2007

Linden H McClure Embedded System Design

Linden H McClure Embedded System Design

Embedded System Design -

Embedded System Design is focused at the fundamentals of embedded system design, and is meant to give students experience in both hardware and firmware.

Tuesday, September 11, 2007

Computer Solutions - Embedded Development Tools

ARM, PPC, Coldfire products, tutorials and a nice database of 8051 chips. Supplying Embedded Development Tool in UK and The EU.

Computer Solutions Ltd - Embedded Development Tools

Assemblers, Compilers and Simulators - cross development software available for most micros.

Portable Digital Oscilloscope DSO-2102
Portable Digital Oscilloscope DSO-2102

The DSO-2102 PC-Based Oscilloscopes connect to your desktop or laptop via the parallel port or USB port (optional). Both channels can operate at up to 100 Million Sa/s with a 32K sample buffer. The 2102M version includes a Spectrum Analyzer (FFT), Advanced triggering, Pass/Fail testing and displays many other useful characteristics of the data.

More at COMSOL

TCP/IP for 8 and 16 bit Embedded Engineers. - An introduction to the subject including descriptions of many of the most important protocols and which ones to use in particular situations with example Embedded Applications.

A series of Embedded Tutorials gives you a fast introduction to CPU families and new communications technologies.

MicroNet TCP/IP for 8 & 16 bit Micros now with Wireless Ethernet 802.11b support.

Computer Solutions Ltd
1a New Haw Road, Addlestone, Surrey KT15 2BZ, England

Saturday, September 01, 2007

Robust Electronic Design - John R Barnes

Robust Electronic Design

Robust Electronic Design - John R Barnes

"As an engineer, I am always working on new things. So I am going to make some mistakes. But I find it very embarrassing to have to redo something because of a mistake that I could and *should* have avoided. ....."

John R. Barnes KS4GL

"My first book, Electronic System Design: Interference and Noise Control Techniques, concentrated on designing electronic equipment to work."

Industrial Standards Index

EMC/EMI/ESD standards for residential/ commercial/ light-industry generic devices

Full Standards Index

(EMC), electromagnetic interference (EMI), and electrostatic discharge (ESD) standards for information technology equipment (ITE) and related (generic) equipment.

Robust Electronic Design, Inc.

Blocks

80C51 Analog Analog-Design Analytical-Instrumentation Android Application-Notes-2 ASIC-Design ASIC-SOC-FPGA Bipolar-Transistors Capacitors Circuit-Archive Circuit-Design Circuit-Design-2 Communications Communications-Chips Component-Testing Computer-IC-Module Computer-Interfacing Control-Systems Design-Service Design-Service-2 Design-Service-3 Digital Discrete-Semiconductors DSP EDA EDA-2 EDA-3 EDA-4 EDA-5 Educational Educational-2 Electrical Electromechanical Embedded Embedded-2 Embedded-Applications Embedded-Systems-Tools Energy-Power Engineering-Services Engineering-Services-2 Engineering-Services-3 ESD-EMI-RFI Firmware Home-Automation Industrial-Automation IoT-WSN-M2M LED-Lighting Magazines Manufacturing-Services Materials-Nanotech Mechanical-3D-CAD Mechatronics Medical-Electronics MEMS Microcontroller Microelectronics Mixed Mixed-Semiconductor Mixed-Signal-Design Opamps Open-Hardware Optoelectronics Organizations-Associations Passive-Components PCB-Layout Photonics-Optics PIC Power-Devices Power-Electronics Power-Electronics-Design Process-Control Process-Control-2 Product-Safety Product-System-Design Projects Quality Reference Research-Institutes RF-Components RF-Design RF-Engineering-Services RF-Microwave RF-Semiconductor RF-Wireless-Networking Robotics Scientific-Software Semiconductors Sensors SMPS-Power-Supply Software-Code Spice-Simulation Standards Standards-2 Tech-Docs Tech-Media Technical-Computing Test-Measurement TM-Applications Training-Consulting Virtual-Instrumentation