参数资料
型号: ST72T141K2MAE
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO34
封装: 0.300 INCH, LEAD FREE, PLASTIC, SOP-34
文件页数: 67/131页
文件大小: 3096K
代理商: ST72T141K2MAE
ST72141K2-Auto
40/131
MOTOR CONTROLLER (Cont’d)
The MTC manages these three events always in
the same order: Z generates C after a delay com-
puted in realtime, then waits for D in order to ena-
ble the peripheral to detect another Z event.
The speed regulation is managed by the micro-
controller, by means of an adjustable reference
current level in case of current control, or by direct
PWM duty-cycle adjustment in case of voltage
control.
All detections of Zn events are done during a short
measurement window while the high side switch is
turned off. For this reason the PWM signal is ap-
plied on the high side switches.
When the high side switch is off, the high side
winding is tied to 0V by the free-wheeling diode,
the low side winding voltage is also held at 0V by
the low side ON switch and the complete BEMF
voltage is present on the third winding: detection is
then possible.
Figure 25. Chronogram of Events (in Autoswitched Mode)
C event
Z event
Cn processing
Wait for Cn
T
Zn
Cn
t
Z > Zn min
C > Cn min
Wait for Dn
DH event
Dn
DS event
Wait for Z
VDD
VSS
P signal when sampled
(Output of the
VREF
(Threshold value for
Voltage on phase A
Voltage on phase B
Voltage on phase C
analog MUX)
Input comparator)
BEMF
sampling
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