Microcontroller - 8051, 8052, OpCodes, Analog Interface.

Thursday, March 15, 2012

Cambridge Consultants - Design Technology

Cambridge Consultants - Design Technology
"Cambridge Consultants is a leading technology and innovation company, renowned for its ability to solve technical problems and provide creative, practical solutions to business issues."
Cambridge Consultants develops industry's smallest 2G and 3G femtocell base station

Sidewinder, the smallest commercially available 2G and 3G small-cell platform. Ideal for use in mobile phone communications and professional radio......
The novel radio design enables Sidewinder to operate at any carrier frequency from 375MHz to 4GHz and with a channel bandwidth from 200kHz to 28MHz. .....
Interface from CC - magazine containing a selection of articles, news stories and thought pieces on current and emerging technologies and markets.

Wednesday, March 14, 2012

Theta Electronic Engineering Services

Theta Electronic Engineering Services
 
"Theta Engineering was founded in 1993 to provide economical engineering services for companies needing to augment their technical resources. Theta Engineering provides a full range of electronic design and software/firmware development services aimed at getting your product to market."

Products developed by Theta Engineering

Robotic Cell Phone Programmer

Designed and programmed custom stepper motor driver boards for a robotic cellular phone programmer. This project involved inter-processor communication between 8 Microchip PIC-family microcontrollers supporting simultaneous motion of up to 7 axes.

Robotic Arm Test System Project
Designed and built 4 different automated test fixtures for Beckman Instruments (now Beckman Coulter). The unit pictured uses a combination of pneumatics and electronics for measuring the force and accuracy of a robotic arm which is itself a component in one of Beckman's medical lab instruments.

ShortLink - Design of Portable Wireless Systems

Product and System, design and development company. They offer design and engineering service in Silicon-ASIC design, Electronic product design and T&M products too.

ShortLink - Design of Portable Wireless Systems

They specialize in the field of low-power portable electronics and wireless systems.
ShortLink - Design of Portable Wireless Systems

ASIC design

Analog, digital ASIC design, Mixed Signal ASIC and RF-ASIC. The last two being areas of expertise. Ready-made IP blocks for analog, digital and RF applications are also available. They are a Fabless ASIC supplier.

Test and Measurement Service

Radio, EMC and environmental durability testing. Audio and acoustics, analysis and characterization of antennas. They offer radio testing up to 18 GHz.
Services Include
  • Radio and EMC testing
  • Assistance in CE marking
  • Antenna measurements
  • Environmental durability testing - temperature, salt, moisture and vibrations
  • Measurement and testing - audio and acoustics
Address - ShortLink AB, Stortorget 2, SE-661 42 Säffle, Sweden

Digital and Embedded Systems Design

An Embedded Microcontroller or DSP system is made of Chips, Circuits and Firmware. The digital voltage levels, speed, bus width, fan out, power consumption are some factors that a designer has to keep in mind. As portable and wireless gadgets are becoming more popular, RF, Ethernet and Energy Efficient Design aspects should be studied. Power electronics and Analog Circuits knowledge is used around the system, all this is integrated to make an instrument, equipment or gadget.

Digital and Embedded Systems Design
  • 80C51 ports can sink more current but source very less, hence use a 10k pull up at all the ports or outputs.
  • Firmware must be developed in increments, tested in increments, backed up in increments, must be modular (include) reuse.
  • Tristate output, High Impedance and Floating all mean the same when it comes to IC Inputs-Outputs. It means the pin is insulated from rest of circuit in the IC. That means it will not influence the node or bus it is connected to. A DMM terminals are floating means that the hand held plastic DMM has no electrical conductive link to earth or ground.
  • You can use hyper terminal to upload code to single board computers 80C51 like in BINARY or ASCII. Hyper Terminal, .
  • ASICs are for large volume production, or for products which have a long product life cycle.
  • Low volume production use FPGA or CPLD, or even flash based microcontrollers, so that all your inventory can be reused and recycled.
  • Cell phones or a LAN card ASIC is ideal as volumes are good in cell phones and for LAN cards the technology is matured. For either FPGA or ASIC's you get IP Modules or Code Libraries for many functions and applications.
  • Whatever the method keep design flexible and modular for reuse and to save cost. remember the hardware is difficult to alter, software can be altered even at customer site, flash has made this possible
  • In the future chips may be both analog and digital programmable with flash.
  • Some FPGA, CPLD, ASIC links, WinCUPL, Design and Reuse, fpga4fun.
  • Unused CMOS inputs should have a pull up or pull down resistor, it should not float, or it oscillates.
  • Have a decoupling capacitor 104 that is 0.1uF or 100nF across the supply of every IC very near the IC supply pins.
  • A watchdog timer should be used in every microcomputer circuit like 8051 so that the system resets on hanging.
  • The reset on a microcomputer should be applied till the supply to it is stabilized, this will enable a clean start.
  • Analog ground (opamps), digital ground (CMOS) and power ground (relays and LED) should be separate, (linked at root)
  • Pull up or pull down resistors in TTL can be 10K and in CMOS 100K and in battery operated systems 1M.
  • CMOS gates and Opamps have a output drive capability of ~ 10-20mA, so when you drive a load say an LED use a series resistor to limit the current to 5mA to 10mA.
  • When the number of digital chips you use in a project goes above 20 or 30 then it is better to use PLD or CPLD types from Altera, Xilinx or Lattice etc.
  • Try to use same family ICs in a circuit, like only LS or only HCT, if you mix up then you have to do a design review.
  • In a industrial environment many motors, DC drives and AC drives will be running, this will produce EMI, RFI, kickback spikes which cause microcontroller based equipment to hang. Use a watchdog timer for uC.
  • More EMI immunity by using opto couplers for all input and outputs, 4-20mA current signals for input and output and an isolated wide range SMPS.

Tuesday, March 13, 2012

ESI Group - Virtual Prototyping Solutions

Software Simulation Solution for prototype development and manufacturing process engineering with applied mechanics.

ESI Group - Virtual Prototyping Solutions

ESI Group - Paris, France - ESI is a world-leading supplier and pioneer of digital simulation software for prototyping and manufacturing processes that take into account material physics.

"Extensive suite of coherent, industry-oriented applications to realistically simulate a product's behavior during testing and real life use.." ESI's products represent a unique collaborative and open environment for End-to-End Virtual Prototyping.

ESI Group - Virtual Prototyping Solutions

Visual-Viewer from ESI is a complete, productive and innovative post processing environment for CAE applications.

Visual-Viewer allows easy and fast graphical interpretation with very useful animation control features such as simple section cut tool, video reading and aligning with simulations, synchronized simulation, and plot windows.

ESI Group
100-102 Avenue de Suffren 75015 Paris FRANCE