ST7MC2S4TC datasheet(143/308 Pages) STMICROELECTRONICS

Part #	ST7MC2S4TC

Description	8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI

PDF	308 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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143 / 308 page

ST7MC1/ST7MC2

143/308

MOTOR CONTROLLER (Cont’d)

Finally, the PWM modulated voltage generated by

the power stage is smoothed by the motor induct-

ance to get sinusoidal currents in the stator wind-

ings.

The induction motor being asynchronous, there is

no need to synchronize the rotor position to the

sinewave generation phase in most of the applica-

tions.

Part of the MTC dedicated to delay computation

and event sampling can thus be reconfigured to

perform speed acquisition of the most common

speed sensor, without the need of an additional

standard timer.

This speed measurement timer with clear-on-cap-

ture and clock prescaler auto-setting allows to

keep the CPU load to a minimum level while taking

benefit of the embedded input comparator and

edge detector.

Figure 75. Complementary PWM generation for three-phase induction motor (1 phase represented)

U event

Compare preload

MCP0

MCPU

PWM generator

counter

PWM Ref

Signal

MCO1

MCO0

Dead time

insertion

ST7MC2S4TC Datasheet(PDF) 143 Page - STMicroelectronics