ST7MC1K2-Auto datasheet(202/371 Pages) STMICROELECTRONICS

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Figure 84.

Protection of ZH event detection

Preload bit, new value taken into account at the next C event (in normal mode) or when a value is written in the MPHST

register when in direct access mode. For more details refer to the description of the DAC bit in Control register A (MCRA)

on page 265. The use of a preload register allows all the registers to be updated at the same time

Position sensor mode

In position sensor mode (SR = 1 in MCRA register), the rotor position information is given to the

peripheral by means of logical data on the three inputs MCIA, MCIB and MCIC (hall sensors).

For each step one of these three inputs is selected (IS[1:0] bits in register MPHST) in order to detect the

Z event. Be careful that the phase comparator is OFF until CKE and /or DAC bits are set in MCRA

In sensor mode, demagnetization and the related features (such as the special PWM configuration, DS or

DH management, programmable filter) are not available (see Table 90).

In sensor mode configuration the rotor detection does not need a particular phase configuration to

perform the measurement and a Z event can be read from any detection window. The sampling is done

at a selectable frequency (fSCF) (see Table 166). This means that Z event position sensoring is more

precise than it is in sensorless mode.

Table 90.

Demagnetization access

SR bit MCRA register

Demagnetization feature availability

1No

0Yes

Sampling clock

Current sample

Previous sample

Phase comparator

Falling/rising edge

MPOL register

CPB(1) bit

Direct/filter PZ

MCRA register

bit 1

ZVD bit

Instantaneous

edge

CRz

Commutation event

Rising edge zero-crossing

Falling edge zero-crossing

Current mode

Voltage mode

MCRB register

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