ST7MC1K2-Auto datasheet(187/371 Pages) STMICROELECTRONICS

187 / 371 page

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ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

On-chip peripherals

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The shape of the output voltage (voltage, frequency, sinewave, trapezoid, ...) is completely

managed by the application software, in charge of computing the compare values to be

loaded for a given PWM duty-cycle (refer to Figure 77).

Finally, the PWM modulated voltage generated by the power stage is smoothed by the

motor inductance to get sinusoidal currents in the stator windings.

The induction motor being asynchronous, there is no need to synchronize the rotor position

to the sinewave generation phase in most of the applications.

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-capture 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 76.

Complementary PWM generation for three-phase induction motor

(1 phase represented)

U event

Compare preload register processing

MCP0

MCPU

PWM generator counter

PWM ref signal

MCO1

MCO0

Deadtime insertion

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Product(s)

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ST7MC1K2-Auto Datasheet(PDF) 187 Page - STMicroelectronics