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參數(shù)資料
| 型號： | DK1241A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Advanced Microstepping Motion Control Chipset |
| 中文描述： | 高級微步運動控制芯片組 |
| 文件頁數(shù)： | 17/60頁 |
| 文件大?。?/td> | 422K |
| 代理商： | DK1241A |
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17
Theory of Operations
DAC data
Incremental Encoder
Trajectory profile
generator (2)
Host I/O controller
Index
B
A
Internal Block Diagram
host interrupt
Data
Control
PWM dir.
DAC address
Motor Output
System Registers (2)
16
1/a
1/a
1/a
1/phase
2
1
8
5
Quadrature
decoder
counter (2)
Index capture
register (2)
Host command
PWM, DAC signal generator (2-4 channels)
Home
1/a
PosLimit
1/a
NegLimit
1/a
Microstepping
Generator (2)
PWM mag.
Over-travel Inputs
Host I/O
The above figure shows an internal block diagramfor 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 mcrostepping signal
generator. The mcrostep 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, mcrostepped 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 mcrostepping signals are output in PWMformat 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.
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