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| 型号： | SAF-C868A-1SGBA |
| 厂商： | INFINEON TECHNOLOGIES AG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, 40 MHz, MICROCONTROLLER, PDSO28 |
| 封装： | PLASTIC, SO-28 |
| 文件页数： | 47/82页 |
| 文件大小： | 1252K |
| 代理商： | SAF-C868A-1SGBA |
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C868
Data Sheet
51
V 1.0, 2003-05
For Brushless-DC motors there is a special mode (MSEL6x = ’1000b’) which is
triggered by a change of the Hall-inputs (CCPOSx). This mode shows the capabilities of
the CCU6. Here T12’s channel 0 acts in capture function, channel 1 and 2 in compare
function (without output modulation) and the multi-channel-block is used to trigger the
output switching together with a possible modulation of T13.
After the detection of a valid Hall edge the T12 count value is captured to channel 0
(representing the actual motor speed) and resets the T12. When the timer reaches the
compare value in channel 1, the next multi-channel state is switched by triggering the
shadow transfer of bit field MCMP (if enabled in bit field SWEN). This trigger event can
be combined with several conditions which are necessary to implement a noise filtering
(correct Hall event) and to synchronize the next multi-channel state to the modulation
sources (avoiding spikes on the output lines). This compare function of channel 1 can be
used as a phase delay for the position input to the output switching which is necessary
if a sensorless back-EMF technique is used instead of Hall sensors. The compare value
in channel 2 can be used as a time-out trigger (interrupt) indicating that the motors
destination speed is far below the desired value which can be caused by a abnormal load
change. In this mode the modulation of T12 has to be disabled (T12MODENx = ’0’).
Figure 0-2
Timer T12 Brushless-DC Mode (MSEL6x = 1000)
capture
event resets
T12
ch0 gets
captured
value for
act. speed
ch1 compare
for phase delay
ch2 compare
for timeout
CC6x
act. speed
CC60
phase delay
CC61
timeout
CC62
COUT6y
1
0
1
CCPOS2
CCPOS0
11
1
00
0
CCPOS1
00
1
11
0
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