ST7MC2N6 データシートの表示（PDF） - STMicroelectronics

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ST7MC2N6

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

MOTOR CONTROLLER (Cont’d)

This sets the minimum off time of the PWM signal

generated by this internal clock. This off time can

vary depending on the output of the current feed-

back comparator. In sensor mode (SR=1) and

when the sampling for the Z event is done during

the PWM ON time in sensorless mode (SPLG bit is

set in MCRC register and /or DS[3:0] bits with a

value other than 000 in MCONF register), there is

no minimum OFF time required anymore, the min-

imum off time is set automatically to 0µs and the

OFF time of the PWM signal is controlled only by

the current regulation loop.

Table 47. Sampling Frequency Selection

SA3 SA2 SA1 SA0

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

Sampling Frequency

50.0 KHz

40.0 KHz

33.33 KHz

25.0 KHz

20.0 KHz

18.1 KHz

15.4 KHz

12.5 KHz

10 KHz

6.25 KHz

3.13 KHz

1.56 KHz

1.25 KHz

961 Hz

625 Hz

390 Hz

Note: Times are indicated for 4 MHz fPERIPH

Figure 107. Sampling clock generation block

Warning: If the off time value set is superior than

the period of the PWM signal (for example 40µs off

time for a 50KHz (25µs period) PWM frequency),

then the signal output on MCOx pins selected is a

100% duty cycle signal (always at 1).

Table 48. Off time table

Sensor Mode

Off Time sen- (SR=1) or sam-

sorless mode pling during ON

OT3 OT2 OT1 OT0

(SR=0)

time in sensor-

less (SPLG =1

(DS[3:0]=0) and/or DS[3:0]

bits)

00 0 0

2.5 µs

00 0 1

5 µs

00 1 0

7.5 µs

00 1 1

10 µs

01 0 0

12.5 µs

01 0 1

15 µs

01 1 0

17.5 µs

01 1 1

10 0 0

20 µs

22.5 µs

No minimum off

time

10 0 1

25 µs

10 1 0

27.5 µs

10 1 1

30 µs

11 0 0

32.5 μs

11 0 1

35 μs

11 1 0

37.5 μs

11 1 1

40 μs

Note: Times are indicated for 4 MHz fPERIPH

MPRSR Register

SA[3:0] bits

4

0

Frequency

OFF time

fPERIPH

Frequency logic

Off-Time logic

2

OT[3:0] bits

MPWME Register

Sampling

Clock

.

Tsampling

Toff (measurement window)

The BEMF is sampled at the end of OFF time

in sensorless mode

Note: The MTC controller input frequency (fPERIPH) is 4 MHz in this example,

It can be configured to 8MHz with the XT16: XT8 bits in the MCONF register

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