ST7MC1K2-Auto datasheet(235/371 Pages) STMICROELECTRONICS

235 / 371 page

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ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

On-chip peripherals

235/371

Current mode

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

measurement window generator (see Figure 108) and the output of the current comparator,

and is directed to the output channel manager as well (Figure 109).

The current reference is provided to the comparator by phase U, V or W of the PWM

Generator (up to 12-bit accuracy) the signal from the three compare registers U, V or W can

be output by setting the PWMU, PWMV or PWMW bits in the MPWME register. The PWM

signal is filtered through an external RC filter on pin MCCREF.

The detected current input must be present on the MCCFI pin.

Current feedback comparator

Two programmable filters are implemented:

●

A blanking window (current window filter) after PWM has been switched ON to avoid

spurious PWM OFF states caused by parasitic noise

●

An event counter (current feedback filter) to prevent PWM being turned OFF when the

first comparator edge is detected.

Figure 106. Current window and feedback filters

PWM on

End of

blanking window?

Current > limit?

Limit = 1?

Reset counter

Increment counter

Set the CL bit

Counter = limit?

Yes

Current window filter

Current feedback filter

Yes

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Product(s)

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