st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 186

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

On-chip peripherals
All detections of Z
turned off. For this reason the PWM signal is applied 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.
Table 82.
For a detailed description of the MTC registers, see
10.6.4
Although the command sequence is rather different between a PM BLDC and an AC three-phase
induction motor, the motor controller can be configured to generate three-phase sinusoidal voltages.
A timer with three independent PWM channels is available for this purpose. Based on each of the PWM
reference signal, two complemented PWM signals with deadtime are generated on the output pins (6 in
total), to drive directly an inverter with triple half bridge topology.
The variable voltage levels to be applied on the motor terminals come from continuously varying duty
cycle, from one PWM period to the other (refer to
dedicated update event (U event) which:
186/371
Demagnetization
demagnetization
Hardware or
Phase state
BEMF edge
BEMF input
hardware-
simulated
updates automatically the compare registers setting the duty cycle to avoid time critical issues and
ensure glitchless PWM operation
generates a dedicated U interrupt in which the values for the next coming update event are loaded in
compare preload registers
register
switch
Step configuration summary
Application example: AC induction motor drive
Current direction
High side
Low side
OO[5:0] bits in MPHST register
Measurement done on
IS[1:0] bits in MPHST register
Back EMF shape
CPB bit in MCRB register (ZVD bit = 0)
Voltage on measured point at the start of
demagnetization
HDM-SDM bits in MCRB register
PWM side selection to accelerate
demagnetization
Driver selection to accelerate
demagnetization
n
events are done during a short measurement window while the high side switch is
Configuration
ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto
Figure 76 on page
Section 10.6.13: MTC
001001 100001 100100 000110 010010 011000
Falling
A to B
MCIC
Low
side
T0
0V
T3
10
10
T3
0
1
A to C
Rising
MCIB
High
side
HV
T0
T5
01
T0
11
1
187). The PWM counter generates a
2
Falling
B to C
MCIA
Low
side
0V
T2
T5
00
10
T5
registers.
0
3
Step
B to A
Rising
MCIC
High
side
HV
T2
T1
T2
10
11
1
4
Falling
C to A
MCIB
Low
side
0V
T4
T1
01
10
T1
0
5
C to B
Rising
MCIA
High
side
HV
T4
T3
00
11
T4
1
6