ST7MC2 datasheet(184/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

10.6.7.6 Summary

The use of the Delay manager registers for the

various available modes is summarized in Table

42.

Table 42. MTIM Timer-related Registers

10.6.8 PWM Manager

The PWM manager controls the motor via the six

output channels in voltage mode or current mode

depending on the V0C1 bit in the MCRA register.

A block diagram of this part is given in Figure 106.

10.6.8.1 Voltage Mode

In Voltage mode (V0C1 bit = ”0”), the PWM signal

which is applied to the switches is generated by

the 12-bit PWM Generator compare U.

Its duty cycle is programmed by software (refer to

the PWM Generator section) as required by the

application (speed regulation for example).

The current comparator is used for safety purpos-

es as a current limitation. For this feature, the de-

tected current must be present on the MCCFI pin

and the current limitation must be present on pin

MCCREF. This current limitation is fixed by a volt-

age reference depending on the maximum current

acceptable for the motor. This current limitation is

generated with the VDD voltage by means of an

external resistor divider but can also be adjusted

with an external reference voltage (

≤ 5 V). The ex-

ternal components are adjusted by the user de-

pending on the application needs. In Voltage

mode, it is mandatory to set a current limitation. As

this limitation is set for safety purposes, an inter-

rupt can be generated when the motor current

feedback reaches the current limitation in voltage

mode. This is the current limitation interrupt and it

is enabled by setting the corresponding CLM bit in

the MIMR register. This is useful in voltage mode

for security purposes.

The PWM signal is directed to the channel manag-

er that connects it to the programmed outputs (see

Figure 106).

Name

Reset Value

Switched / Auto Switched Mode

Speed Measurement Mode

MTIM

00h

Timer Value

16-bit Timer MSB Value

MTIML

00h

N/A

16-bit Timer LSB Value

MZREG

00h

Capture/compare Zn

Capture of 16-bit Timer MSB

MZPRV

00h

Capture Zn-1

Capture of 16-bit Timer LSB

MCOMP

00h

Compare Cn+1

N/A

MDREG

00h

Demagnetization Dn

Compare for Speed Error

interrupt generation

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