ST7MC1 datasheet(157/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.6.8 Position Sensor Mode

In position sensor mode (SR=1 in MCRA register),

the rotor position information is given to the periph-

eral 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 32)

Table 32. Demagnetisation access

In sensor mode configuration the rotor detection

doesn’t 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

82. This means that Z event position sensoring is

more precise than it is in sensorless mode.

There is no minimum off time required for current

control PWM in sensor mode so the minimum off

time is set automatically to 0µs as soon as the SR

bit is set in the MCRA register and a true 100%

duty cycle can be set in the PWM compare U reg-

ister for the PWM generation in voltage mode.

In Sensor mode, the ZEF[3:0] bits in the MZFR

number of consecutive Z samples needed to gen-

erate the active event.

Procedure for reading sensor inputs in Direct

Access mode: In Direct Access mode, the sen-

sors can be read either when the clock are ena-

bled or disabled (depending on CKE it in MCRA

steps have to be performed:

1. Select Direct Access Mode (DAC bit in MCRA

2. Select the appropriate MCIx input pin by means

of the IS[1:0] bits in the MPHST register

3. Read the comparator output (HST bit in the

MREF register)

SR bit

MCRA register

Demagnetisation feature

availabilty

1NO

0YES

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