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參數(shù)資料
| 型號： | 33991 |
| 廠商： | Motorola, Inc. |
| 英文描述： | Gauge Driver Integrated Circuit |
| 中文描述： | 儀表驅(qū)動集成電路 |
| 文件頁數(shù)： | 26/36頁 |
| 文件大?。?/td> | 660K |
| 代理商： | 33991 |
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33991
26
Go to: www.freescale.com
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 μs 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
thantheoptimalfrequencybysendingacalibrationpulselonger
or shorter than the intended 8 μs. 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 μs instead
of 8 μs. 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
SI
SCLK
CSB
PECR Command
8us Calibration Pulse
D15
D0
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VELOCITY
Acceeae
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STEPS
F
Freescale Semiconductor, Inc.
For More Information On This Product,
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 33-991 | 制造商:Ideal Industries Inc 功能描述:LTKII,350MHZ,CAT6 W/CAT6 ADPT |
| 3399-1 | 制造商:3M 功能描述:3399-1 |
| 33992 | 制造商:Ideal Industries Inc 功能描述:LTKII500MHZ,CAT6A W/CAT6A ADPT |
| 33992510000001 | 功能描述:電纜組件 CABLE KIT RoHS:否 制造商:Molex 產(chǎn)品:Power Assemblies 類型:Cable Assembly 連接器端口 A:No Connector 連接器端口 A 管腳計數(shù):4 連接器端口 B:No Connector 連接器端口 B 管腳計數(shù): 型式:Male 線規(guī) - 美國線規(guī)（AWG）:20, 28 長度:0.305 m 顏色:Black, Red |
| 33993 | 制造商:Ideal Industries Inc 功能描述:LTKII1000MHZ,CAT7A W/CAT6AADPT |
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