sak-c868p-1rr Infineon Technologies Corporation, sak-c868p-1rr Datasheet - Page 101

• Manufacturer Part Number: sak-c868p-1rr
• Description: 8 - Bit Cmos Microcontroller
• Manufacturer: Infineon Technologies Corporation

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 (see also figures Multi-channel Selection and Synchronization, Hall Event
Actions, Modulation Selection and Alternate Output Enable of T12 and Timer T12
Brushless-DC Mode). 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 4-35
User’s Manual
CCPOS0
CCPOS1
CCPOS2
COUT6y
CC60
CC61
CC62
CC6x
Timer T12 Brushless-DC Mode (MSEL6x = 1000)
phase delay
act. speed
timeout
1
0
1
event resets
1
0
0
capture
T12
act. speed
1
1
0
ch0 gets
captured
value for
4-57
0
1
0
On-Chip Peripheral Components
0
1
1
for phase delay
ch1 compare
0
1
0
ch2 compare
for timeout
V 1.0, 2003-01
C868