ST7MC1 datasheet(159/308 Pages) STMICROELECTRONICS

159 / 308 page

ST7MC1/ST7MC2

159/308

MOTOR CONTROLLER (Cont’d)

Depending on the frequency and the duty cycle of

the PWM signal, the delay inserted before sam-

pling could cause it sample the signal OFF time in-

stead of the ON time. In this case an interrupt can

be generated and the sample will not be taken into

acount. When a sample occurs outside the PWM

signal ON time, the SOI bit in the MCONF register

is set and an interrupt request is generated if the

SOM bit is set in the MCONF register. This inter-

rupt is enabled only if a delay value has been set in

the DS[3:0] bits. In this case, the sampling is done

at the PWM frequency but only during the ON time

of the PWM signal. Figure 84 and Figure 85 shows

in detail the generation of the sampling order when

the delay is added.

For complete flexibility, the possibility of sampling

at fSCF high frequency during the ON time of the

PWM signal is also available when the SPLG bit is

set as if there is a delay value in the DS[3:0] bits.

This means that when the sampling is to be per-

formed, after the delay a sampling window at fSCF

frequency is opened until the next OFF time of the

PWM signal. The Sampling Out interrupt will be

generated if the delay added is longer than the

duty cycle of the PWM signal. As the SPLG bit is

set and a value has been put in the DS[3:0] bits,

no minimum off time is required for the PWM sig-

nal and it is automatically set to 0µs in current

mode. A true 100% duty cycle can be also set in

the 12-bit Timer in voltage mode. Figure 86 shows

in detail the sampling at fSCF high frequency dur-

ing ON time.

Figure 84. Adding the Delay to sample during ON time for Z detection

Figure 85. Sampling Out interrupt generation

PWM OFF

time

Current

sample

DS[3:0]

New

sample

TSampling

PWM signal

DS[3:0]

PWM OFF

time

Current

sample

DS[3:0]

TSampling

PWM signal

New sample during next

OFF time. Sample not taken into

account. SO interrupt generated.

To interrupt generator

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