ST7MC2M9 STMicroelectronics, ST7MC2M9 Datasheet - Page 142

• Manufacturer Part Number: ST7MC2M9
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
• Manufacturer: STMicroelectronics

Specifications of ST7MC2M9

• Hdflash Endurance: 100 cycles, data retention
• Clock Sources: crystal/ceramic resonator oscillators and by-pass for external clock, clock security system.
• Four Power Saving Modes: Halt, Active-Halt, Wait and Slow
• Main Clock Controller With: Real time base, Beep and Clock-out capabilities
• Two 16-bit Timers With: 2 input captures, 2 output compares, external clock input, PWM and pulse generator modes
• 8-bit Pwm Auto-reload Timer With: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector

ST7MC1xx/ST7MC2xx
MOTOR CONTROLLER (Cont’d)
Figure 74. Example of Command Sequence for 6-step Mode (typical 3-phase PM BLDC Motor
Control)
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1
Superimposed voltage
(BEMF induced by rotor)
- approx. HV/2 (PWM on)
- approx. 0V (PWM off)
Note: Control & sampling PWM influence is not represented on these simplified chronograms.
Switch
Node
Step
A
B
C
0
1
2
3
4
5
HV
HV/2
0
HV
HV/2
0
HV
HV/2
0
Demagnetization
Σ
Σ
1
1
HV
HV/2
0V
Σ
2
Wait for BEMF = 0
Σ
3
D
Σ
Σ
2
2
4
C
2
Commutation delay
Σ
5
Z
2
Σ
6
Σ
Σ
3
1
Σ
2
Σ
3
Σ
4
T0
T1
A
PWM off pulses
I
4
D
5
I
5
Σ
Z
5
5
I
1
C
T2
T3
4
B
HV
I
I
Σ
6
2
t
6
T4
I
T5
3
C