ST7MC1 datasheet(161/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.6.10 Commutation Noise Filter

For D event detection and for Z event detection

(when SPLG bit is set while DS[3:0] bits are reset),

sampling is done at fSCF during the PWM ON or

OFF time (“Sampling block” on page 158). To

avoid any erroneous detection due to PWM com-

mutation noise, an hardware filter of 1µs (for fPER-

IPH = 4Mhz) when PWM is put ON and when PWM

is put OFF has been implemented. This means

that, with sampling at 1MHz (1µs), due to this filter,

1 sample are ignored directly after the commuta-

tion.

This filter is active all the time for the D event and

it is active for the Z event when the SPLG bit is set

and DS[3:0] bits are cleared (meaning that the Z

event is sampled at high frequency during the

PWM ON or OFF time).

Table 34. Sensor/sensorless mode and D & Z event selection

Note: For fSCF selection, see Table 82

bit

SPLG

bit

DS[3:0]

bits

Mode

OS[2:0]

bits use

Event detection

sampling clock

Sampling

behaviour for

Z event

detection

Window and

Event Filters

Behaviour of the

output PWM

000

Sensors

not used

Enabled

fSCF

Z: SA&OT config.

PWM frequency

At the end of

the off time of

the PWM sig-

nal

“Before D” behaviour,

“between D and Z” be-

haviour and “after Z”

behaviour

000

Sensors

not used

Enabled

fSCF

During off time

or ON time of

the PWM sig-

nal

“Before D” behaviour,

“between D and Z” be-

haviour and “after Z”

behaviour

Not

equal to

000

Sensors

not used

Enabled

fSCF

Z: SA&OT config.

PWM frequency

During ON

time of the

PWM signal

“Before D” behaviour,

“between D and Z” be-

haviour and “after Z”

behaviour

Not

equal to

000

Sensors

not used

Enabled

fSCF

During ON

time of the

PWM signal

“Before D” behaviour,

“between D and Z” be-

haviour and “after Z”

behaviour

xxx

Position

Sensors

used

OS1 dis-

abled

fSCF

During OFF

time or ON

time of the

PWM signal

No Z Window Filter

Only Z Event Filter

is active in

Sensor mode

“Before Z” behaviour

and “after Z” behaviour

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