#microchip-technology

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Elemente der angewandten Elektronik - Wolfgang Oberschelp, Dietmar Ehrhardt, Erwin Böhmer

Elemente der angewandten Elektronik

Wolfgang Oberschelp, Dietmar Ehrhardt, Erwin Böhmer

the statistical average of many conversions Stated dif ferently it is the voltage input at which the uncertainty of the conversion is - Russ Cooper

The statistical average of many conversions Stated dif ferently it is the voltage input at which the uncertainty of the conversion is

INTRODUCTION This application note provides some utility math routines for Microchip s PIC16C5X and PIC16CXXX series of bit microcontrollers The following math outlines are provided: 8x8 unsigned multiply 16x16 double precision multiply Fixed Point Division Table 16x16 double precision addition 16x16 double precision subtraction BCD Binary Coded Decimal to binary conversion - Amar Palacherla

INTRODUCTION This application note provides some utility math routines for Microchip's PIC16C5X and PIC16CXXX series of bit microcontrollers The following math outlines are provided: 8x8 unsigned multiply 16x16 double precision multiply Fixed Point Division Table 16x16 double precision addition 16x16 double precision subtraction BCD Binary Coded Decimal to binary conversion

Amar Palacherla

INTRODUCTION This technical brief describes the creation of a USB device that can enumerate as a mouse or as a keyboard depending on which PS peripheral is plugged into it The Soft Detach provision of the PIC16C745 support firmware makes the creation of such a device possible Two earlier Briefs TB055 and TB056 describe in detail the implementation of a PS to USB mouse translator and a PS to USB key board translator respectively This brief will not discuss the translation of either of these devices Rather it focuses on the Soft Detach function and on modifying the descriptor jump table for a device with multiple sets of descriptors - Microchip Technology Inc.

INTRODUCTION This technical brief describes the creation of a USB device that can enumerate as a mouse or as a keyboard depending on which PS peripheral is plugged into it The Soft Detach provision of the PIC16C745 support firmware makes the creation of such a device possible Two earlier Briefs TB055 and TB056 describe in detail the implementation of a PS to USB mouse translator and a PS to USB key board translator respectively This brief will not discuss the translation of either of these devices Rather it focuses on the Soft Detach function and on modifying the descriptor jump table for a device with multiple sets of descriptors

Microchip Technology Inc.

Bit PIC® Microcontrollers First Half -

Bit PIC® Microcontrollers First Half

Microcontrol High perform Only sing - Microchip Technology

Microcontrol High perform Only sing

Microchip Technology

INTRODUCTION An induction motor can run only at its rated speed when it is connected directly to the main supply However many applications need variable speed operations This is felt the most in applications where input power is directly proportional to the cube of motor speed In applications like the induction motor based centrifugal pump a speed reduction of results in an energy savings of approximately Driving and controlling the induction motor efficiently are prime concerns in today s energy conscious world With the advancement in the semiconductor fabrication technology both the size and the price of semiconduc tors have gone down drastically This means that the motor user can replace an energy inefficient mechani cal motor drive and control system with a Variable Frequency Drive VFD The VFD not only controls the motor speed but can improve the motor s dynamic and steady state characteristics as well In addition the VFD can reduce the system s average energy consumption Although various induction motor control techniques are in practice today the most popular control tech nique is by generating variable frequency supply which has constant voltage to frequency ratio This technique is popularly known as VF control Generally used for open loop systems VF control caters to a large num ber of applications where the basic need is to vary the motor speed and control the motor efficiently It is also simple to implement and cost effective The PIC16F7X7 series of microcontrollers have three on chip hardware PWM modules making them suitable for phase motor control applications This application note explains how these microcontrollers - Microchip Technology

INTRODUCTION An induction motor can run only at its rated speed when it is connected directly to the main supply However many applications need variable speed operations This is felt the most in applications where input power is directly proportional to the cube of motor speed In applications like the induction motor based centrifugal pump a speed reduction of results in an energy savings of approximately Driving and controlling the induction motor efficiently are prime concerns in today's energy conscious world With the advancement in the semiconductor fabrication technology both the size and the price of semiconduc tors have gone down drastically This means that the motor user can replace an energy inefficient mechani cal motor drive and control system with a Variable Frequency Drive VFD The VFD not only controls the motor speed but can improve the motor's dynamic and steady state characteristics as well In addition the VFD can reduce the system's average energy consumption Although various induction motor control techniques are in practice today the most popular control tech nique is by generating variable frequency supply which has constant voltage to frequency ratio This technique is popularly known as VF control Generally used for open loop systems VF control caters to a large num ber of applications where the basic need is to vary the motor speed and control the motor efficiently It is also simple to implement and cost effective The PIC16F7X7 series of microcontrollers have three on chip hardware PWM modules making them suitable for phase motor control applications This application note explains how these microcontrollers

Microchip Technology

COURS « INITIATION AUX MICROCONTROLEURS PIC DE MICROCHIPS » -

COURS « INITIATION AUX MICROCONTROLEURS PIC DE MICROCHIPS »

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