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參數(shù)資料
| 型號： | MC68HC708MP16 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 35/44頁 |
| 文件大小： | 342K |
| 代理商： | MC68HC708MP16 |
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Application Note
High Performance Servo Controller
AN1712
MOTOROLA
35
Motor velocity data is often obtained by counting encoder pulses during
a given sampling period. This gives satisfactory results, assuming that
the motor velocity is high enough to yield many encoder counts per
sampling period. However, at slower speeds, the quantization noise
becomes much more noticeable since the velocity signal is so small.
Indeed, one can envision the scenario of an extremely slow motor where
the number of encoder counts per sampling interval is either 0 or 1. This
lack of resolution often results in erratic servo behavior at slower speeds
manifested by an audible "scraping" sound from the motor.
To mitigate this effect, many servo systems which synthesize velocity
information from the encoder will instead measure the period of the
encoder signals at slower motor speeds. In fact, the slower the rotation,
the higher the resolution of the period measurement. This value can then
be inverted and scaled in software to obtain a velocity signal with very
high resolution. The most accurate velocity information from an encoder
is obtained by measuring the time between similar edges on a given
signal, since the timing skew between the two encoder channels varies
as a function of the encoder angle. To ensure that the velocity
information is updated as frequently as possible, four timer channels are
used as seen in
Figure 17
, resulting in an update to the velocity
information every encoder count.
To buffer the signals coming from the encoder, the Motorola MC1489A
quad line receiver is an excellent choice for several reasons related to
the device’s noise rejection capabilities. First, the input threshold is rated
to work with TTL and CMOS level signals, but will continue to function
properly for input voltages up to 30 volts. Also, by connecting an
appropriately sized filter capacitor to the response control pin, the device
provides noise spike rejection. The rejection capability increases with
the capacitor size and is documented on the device’s data sheet. Finally,
the input provides about 1 volt of hysteresis, resulting in further noise
rejection.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68HC708MP16CFU | 制造商:MAJOR 功能描述: |
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| MC68HC711D3CFNE3 | 功能描述:8位微控制器 -MCU 8B OTP 192RAM 2 MHZ RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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