MC1151A Ver la hoja de datos (PDF) - PMD

Número de pieza

componentes Descripción

Fabricante

MC1151A

Advanced Step Motor Control Chipset

PMD 

Theory of Operations

Internal Block Diagram

Home

Input

1/a

Motor Output Signals

Step

Direction

1/a

1/a

Miscellaneous Signals

At Rest

1/a

Pulse & Direction

Generator (1-4)

I/O Chip

CP Chip

Trajectory profile

generator (1-4)

System Registers (1-4)

Host I/O controller

5

Control

8

Data

Host I/O

1

host interrupt

Host command

1/a

1/a

PosLimit NegLimit

Overtravel Inputs

Encoder Inputs

B

A

1/a

1/a

Quadrature

decoder

counter (1-4)

ENC

Chip

The above figure shows an internal block diagram for the MC1451A

and MC1451A-E Motion Processors.

The MC1451-series chipsets consist of two chips, an ASIC (Application

Specific I.C.) called the I/O chip and a DSP (Digital Signal Processor)

called the CP chip. The MC1451-E series chipsets consist of these

same two chips along with an additional ASIC chip called the ENC chip.

The function of the I/O ASIC is to perform host I/O as well as pulse

generation. The function of the CP chip is to perform all motion

computations. The function of the ENC chip is to perform quadrature

position decoding.

The chipset supports up to four axes simultaneously. Each axis

provides programmable trajectory generation including electronic

gearing, trapezoidal point-to-point, s-curve point to point, and a velocity

contouring mode.

The chipset calculates all trajectory information on a cycle-by-cycle

basis. Each cycle results in a new desired pulse rate based on the

trajectory generator mode and the specified trajectory parameters. By

feeding the resulting pulse rate to the pulse generating circuitry of the

I/O ASIC at each cycle, continuous and smooth motion is achieved for

all four axes.

The I/O ASIC provides high speed pulse and direction generation

appropriate for interfacing to a wide variety of standard stepper drivers.

Two pulse rate operating modes are provided, one which results in a

pulse rate range of 0 - ~48,000 pulses per second (standard range),

and one which results in a pulse rate range of 0 - ~1,500,000 pulses per

second (high speed range).

The encoder feedback, which is available through the optional ENC

chip, is updated at each chipset cycle. This information can be used by

the host to check that the axis has achieved a desired position.

Additionally, the chipset can use the encoder information to

automatically detect a motor stall condition while a move is ongoing.

The following table summarizes the operational parameters of the

MC1451-series chipsets.

17

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