ST7MC1 datasheet(185/308 Pages) STMICROELECTRONICS

185 / 308 page

ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.8.2 Over Current Handling in Voltage

mode

When the current limitation interrupt is enabled by

setting the CLIM bit in the MIMR register (available

only in Voltage mode), the OCV bit in MCRB reg-

ister will determine the effect of this interrupt on

the MCOx outputs as shown in Table 43.

Table 43. OCV bit effect

For safety purposes, it can be necessary to put all

MCOx outputs in reset state (high impedance,

high state or low state depending on the setting

made by the option byte) on a current limitation in-

terrupt. This is the purpose of the OCV bit. When a

current limitation interrupt occurs, if the OCV bit is

reset, the effect on the MCOx outputs is only to put

the PWM signal OFF on the concerned outputs. If

the OCV bit is set, when the current limitation inter-

rupt occurs, all the MCOx outputs are put in reset

state.

Note 1: Only this functionality (CLIM = CLI = OCV

= 1) is valid when the 3 PWM channels are ena-

bled (PCN bit =1 in the MDTG register). It can also

be used as an over-current protection for three-

phase PWM application (only if voltage mode is

selected)

10.6.8.3 Current Mode

In current mode, the PWM output signal is gener-

ated by a combination of the output of the meas-

urement window generator (see Figure 107) and

the output of the current comparator, and is direct-

ed to the output channel manager as well (Figure

108).

The current reference is provided to the compara-

tor by Phase U, V or W of the PWM Generator (up

to 12-bit accuracy) the signal from the three com-

pare registers U, V or W can be output by setting

the PWMU, PWMV or PWMW bits in the MPWME

ternal RC filter on pin MCCREF.

The detected current input must be present on the

MCCFI pin.

10.6.8.4 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 105. Current Window and Feedback

Filters

CLIM bit CLI bit OCV bit

Output effect

Interrupt

Normal running

mode

PWM is put OFF

on Current loop

effect

Normal running

mode

PWM is put OFF

on Current loop

effect

Yes

All MCOx outputs

are put in reset

state (MOE re-

set)1)

Yes

PWM on

End of

Blanking Window

Current >

Limit

Limit=1?

Reset counter

Increment counter

Set the CL bit

Counter=

Yes

WINDOW

FILTER

FEEDBACK

FILTER

Limit?

CURRENT

Yes

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