ST7FMC1K2B6 STMicroelectronics, ST7FMC1K2B6 Datasheet - Page 140

• Manufacturer Part Number: ST7FMC1K2B6
• Description: MCU 8BIT 8K FLASH 32DIP
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST7FMC1K2B6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: LINSCI
• Peripherals: LVD, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 384 x 8
• Voltage - Supply (vcc/vdd): 3.8 V ~ 5.5 V
• Data Converters: A/D 16x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-DIP (0.600", 15.24mm)
• For Use With: 497-8402 - BOARD EVAL COMPLETE INVERTER497-8400 - KIT IGBT PWR MODULE CTRL ST7MC497-4734 - EVAL KIT 3KW POWER DRIVER BOARD497-4733 - EVAL KIT 1KW POWER DRIVER BOARD497-4732 - EVAL KIT 300W POWER DRIVER BOARD497-4731 - EVAL KIT PWR DRIVER CONTROL BRD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Other names: 497-4864

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.