ST7MC2R6 STMicroelectronics, ST7MC2R6 Datasheet - Page 140

• Manufacturer Part Number: ST7MC2R6
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC,BRUSHLESS MOTOR CONTROL, 5 TIMERS, SPI, LINSCI(TM)
• Manufacturer: STMicroelectronics

Specifications of ST7MC2R6

• 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)
10.6.3 Application Example: PM BLDC motor
drive
This example shows a six-step command se-
quence for a 3-phase permanent magnet DC
brushless motor (PM BLDC motor).
shows the phase steps and voltage, while
24
To run this kind of motor efficiently, an autoswitch-
ing mode has to be used, i.e. the position of the ro-
tor must self-generate the powered winding com-
mutation. The BEMF zero crossing (Z event) on
the non-excited winding is used by the MTC as a
rotor position sensor. The delay between this
event and the commutation is computed by the
MTC and the hardware commutation event C
automatically generated after this delay.
After the commutation occurs, the MTC waits until
the winding is completely demagnetized by the
free-wheeling diode: during this phase the winding
is tied to 0V or to the HV high voltage rail and no
BEMF can be read. At the end of this phase a new
BEMF zero-crossing detection is enabled.
140/309
1
shows the relevant phase configurations.
Figure 74
Table
n
is
The end of demagnetization event (D), is also de-
tected by the MTC or simulated with a timer com-
pare feature when no detection is possible.
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 BEMF zero-crossing event (Z), can also be
detected by the MTC or simulated with a timer
compare feature when no detection is possible.
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.