參數(shù)資料
型號(hào)： PC33991DHR2
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, PDSO24
封裝： PLASTIC, SOIC-28
文件頁(yè)數(shù)： 19/36頁(yè)
文件大小： 660K
代理商： PC33991DHR2
33991
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
26
calibration procedure was not successful. A clock calibration is
allowed only if the gauges are disabled or the pointers are not
moving, indicated by status bits ST4 and ST5.
Figure 7. Gauge Enable and Clock Calibration Example
Some applications may require a guaranteed maximum
pointer velocity and acceleration. Guaranteeing these
maximums requires the nominal internal clock frequency fall
below 1 MHz. The frequency range of the calibrated clock is
always below 1 MHz if PECR bit D4 is logic [0] when initiating a
calibration command, followed by an 8 s reference pulse. The
frequency is centered at 1 MHz if bit D4 is logic [1].
The 33991 can be deceived into calibrating faster or slower
than the optimal frequency by sending a calibration pulse longer
or shorter than the intended 8 s. As long as the count remains
between four and 15 there is no clock calibration flag. For
applications requiring a slower calibrated clock, i.e., a motor
designed with a gear ratio of 120:1 (8 microsteps/degrees), a
longer calibration pulse is required. The device allows a SPI
selectable slowing of the internal oscillator, using the PECR
command so the calibration divisor safely falls within the four to
15 range when calibrating with a longer time reference. For
example, for the 120:1 motor the pulse would be 12 s instead
of 8 s. The result of this slower calibration results in the longer
step times necessary to generate pointer movements
meetingthe acceleration and velocity requirements. The
resolution of the pointer positioning decreases from 0.083
°/
microstep (180:1) to 0.125
°/microstep (120:1). The pointer
sweep range increases from approximately 340
° to over 500°.
Note:
Be aware a fast calibration could result in violations of the
motor acceleration and velocity maximums, resulting in missed
steps.
Pointer Deceleration Waveshaping
Constant acceleration and deceleration of the pointer results
in choppy movements when compared to air core movements.
Air core behavior can be simulated with appropriate wave
shaping during deceleration only. This shaping is achieved by
adding repetitive steps at several of the last step values. An
example is illustrated in Figure 8.
Figure 8. Deceleration Waveshaping
SI
SCLK
CSB
PECR Command
8us Calibration Pulse
D15
D0
Figure 5-2 Gauge Enable & Clock Calibration Example
SI
SCLK
CS
24
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HOLDCNT=
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8
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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