ST7MC1K2 datasheet(203/371 Pages) STMICROELECTRONICS

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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

generation in voltage mode.

In sensor mode, the ZEF[3:0] bits in the MZFR register are active and can be used to define

the number of consecutive Z samples needed to generate the active event.

Procedure for reading sensor inputs in direct access mode

In direct access mode, the sensors can be read either when the clock is enabled or disabled

(depending on the CKE bit in the MCRA register). To read the sensor data the following

steps have to be performed:

Select direct access mode (DAC bit in MCRA register)

Select the appropriate MCIx input pin by means of the IS[1:0] bits in the MPHST

Read the comparator output (HST bit in the MREF register)

Sampling block

For a full digital solution, the phase comparator output sampling frequency is the frequency

of the PWM signal applied to the switches and the sampling for the Z event detection in

sensorless mode is done at the end of the off time of this PWM signal to avoid to have to re-

create a virtual ground because when the PWM signal is off, the star point is at ground due

to the free-wheeling diode. That’s why, the sampling for Z event detection is done by default

during the OFF-state of the PWM signal and therefore at the PWM frequency.

In current mode, this PWM signal is generated by a combination of the output of the

measurement window generator (SA[3:0] bits), the output of the current comparator and a

minimum OFF time set by the OT[3:0] bits for system stabilization.

In voltage mode, this PWM signal is generated by the 12-bit PWM generator signal in the

compare U register with still a minimum OFF time required if the sampling is done at the end

of the OFF time of the PWM signal for system stabilization. The PWM signal is put OFF as

soon as the current feedback reaches the current input limitation. This can add an OFF time

to the one programmed with the 12-bit Timer.

For D event detection in sensorless mode, no specific PWM configuration is needed and the

sampling frequency (fSCF, see Table 166) is completely independent from the PWM signal.

In sensor mode, the D event detection is not needed as the MCIA, MCIB and MCIC pins are

the digital signals coming from the hall sensors so no specific PWM configuration is needed

and the sampling for the Z detection event is done at fSCF, completely independent from the

PWM signal.

In sensorless mode, if a virtual ground is created by the addition of an external circuit,

sampling for the Z event detection can be completely independent from the PWM signal

applied to the switches. Setting the SPLG bit in the MCRC register allows a sampling

frequency of fSCF for Z event detection independent from the PWM signal after getting the D

(end of demagnetization) event. This means that the sampling order is given whatever the

PWM signal (during the ON time or the OFF time). As soon as the SPLG bit is set in the

MCRC register, the minimum OFF time needed for the PWM signal in current mode is set to

0µs and a true 100% duty cycle can be set in the 12-bit PWM generator compare register in

voltage mode.

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