ST7MC1K2 datasheet(183/371 Pages) STMICROELECTRONICS

183 / 371 page

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On-chip peripherals

183/371

10.6.2

Main features

●

2 on-chip analog comparators: one for BEMF zero-crossing detection, the other for

current regulation or limitation

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7 selectable reference voltages for the hysteresis comparator (0.2V, 0.6V, 1V, 1.5V, 2V,

2.5V, 3.5V) and the possibility to select an external reference pin (MCVREF).

●

8-bit timer (MTIM) with three compare registers and two capture features, which may

be used as the delay manager of a speed measurement unit

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Measurement window generator for BEMF zero-crossing detection

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Filter option for the zero-crossing detection

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Auto-calibrated prescaler with 16 division steps

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8x8-bit multiplier

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Phase input multiplexer

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Sophisticated output management:

–

The six output channels can be split into two groups (high and low).

–

The PWM signal can be multiplexed on high, low or both groups, alternatively or

simultaneously, for six-step motor drives.

–

12-bit PWM generator with full modulation capability (0 and 100% duty cycle),

edge or center-aligned patterns

–

Dedicated interrupt for PWM duty cycles updating and associated PWM repetition

counter

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Programmable deadtime insertion unit

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Programmable high frequency chopper insertion and high current PWM outputs

for direct optocoupler drives

–

The output polarity is programmable channel by channel.

–

A programmable bit (active low) forces the outputs in HiZ, low or high state,

depending on option byte 1 (refer to Section 14: ST7MCxxx-Auto device

configuration and ordering information).

–

An ‘emergency stop’ input pin (active low) asynchronously forces the outputs in

HiZ, Low or High state, depending on option byte 1 (refer to Section 14:

ST7MCxxx-Auto device configuration and ordering information).

10.6.3

Application example: PM BLDC motor drive

This example shows a six-step command sequence for a 3-phase permanent magnet DC

brushless motor (PM BLDC motor). Figure 75 shows the phase steps and voltage, while

Table 82 shows the relevant phase configurations.

To run this kind of motor efficiently, an autoswitching mode has to be used, that is, the

position of the rotor must self-generate the powered winding commutation. 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 Cn is 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.

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