ST7PMC2S7B6 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ST7PMC2S7B6
STMicroelectronics
ST7PMC2S7B6 Datasheet PDF : 309 Pages
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ST7MC1xx/ST7MC2xx
MOTOR CONTROLLER (Cont’d)
In conclusion, there are 4 sampling types that are
available for Z event detection in sensorless
mode.
1. Sampling at the end of the OFF time of the
PWM signal at the PWM frequency
2. Sampling, at a programmable frequency inde-
pendent of the PWM state (during ON time or
OFF time of the signal). Sampling is done at
fSCF, see Table 82.
3. Sampling during the ON time of the PWM sig-
nal by adding a delay at PWM frequency
4. Sampling, at a programmable frequency during
the ON time (addition of a programmable delay)
of the PWM signal. Sampling is done at fSCF,
see Table 82.
Note 1: The sampling type is applied only for Z
event detection after the D event has occured.
Whatever the sampling type for Z event detection,
the sampling of the signal for D event detection is
always done at the selected fSCF frequency (see
Table 82), independently of the PWM signal (ei-
ther during ON or OFF time). Table 34 explains the
different sampling types in sensorless and in sen-
sor mode.
Note 2: When the MOE bit in the MCRA register is
reset (MCOx outputs in reset state), and the SR bit
in the MCRA register is reset (sensorless mode)
and the SPLG bit in the MCRC register is reset
(sampling at PWM frequency) then, depending on
the state of the ZSV bit in the MSCR register, Z
event sampling can run or be stopped (and D
event is sampled).
Note 3: When BEMF sampling is performed at the
end of the PWM signal off-time, the inputs in OFF-
state are grounded or put in HiZ as selected by the
DISS bit in the MSCR register.
Note 4: The ZEF[3:0] event counter in the MZFR
register is active in all configurations.
Figure 86. Sampling during ON time at fSCF
fSCF
during
ON time
PWM signal
DS[3:0]
DS[3:0]
PWM OFF
state
Current
sample
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