MC1141A Ver la hoja de datos (PDF) - PMD
Número de pieza
componentes Descripción
Fabricante
MC1141A Datasheet PDF : 60 Pages
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Theory of Operations
Incremental Encoder
Index Home
B
1/a
1/a 1/a
Internal Block Diagram
A
1/a
Motor Output
PWM mag. PWM dir.
DAC address
1/phase
2
DAC data
16
PWM, DAC signal generator (2-4 channels)
Index capture
register (2)
Quadrature
decoder
counter (2)
Microstepping
Generator (2)
Trajectory profile
generator (2)
System Registers (2)
Host I/O controller
5
Control
8
Data
Host I/O
1
host interrupt
Host command
1/a
1/a
PosLimit NegLimit
Over-travel Inputs
The above figure shows an internal block diagram for the MC1241A
motion processor.
Each axis provides programmable trajectory generation including
electronic gearing, trapezoidal point-to-point, and s-curve point to point
moves. In addition the chipset contains an internal microstepping signal
generator. The microstep generator outputs 2 phased signals per axis
with 64 usteps per full step. These signals can be used to directly drive
each coil of the stepper motor for smooth, microstepped motion.
The chipset calculates all trajectory information on a cycle-by-cycle
basis. Each cycle results in a new desired sine-wave frequency output
based on the trajectory generator mode and the specified trajectory
parameters.
The sine-wave microstepping signals are output in PWM format with a
separate magnitude and sign signal per phase, or as a digital word with
up to 16 bits of resolution that is constructed externally into an analog
signal using a DAC. In DAC mode two address bits indicate which of
the two axes and two phases are being loaded by the chipset.
Encoder feedback is available for each motor axis and 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
MC1241-series chipsets.
17
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