ST7MC2 datasheet(216/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

REFERENCE REGISTER (MREF)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = HST: Hysteresis Comparator Value.

This read only bit contains the hysteresis compa-

rator output.

0: Demagnetisation/BEMF comparator is under

VREF

1: Demagnetisation/BEMF comparator is above

VREF

Bit 6 = CL: Current Loop Comparator Value.

This read only bit contains the current loop compa-

rator output value.

0: Current detect voltage is under VCREF

1: Current detect voltage is above VCREF

Bit 5= CFAV: Current Feedback Amplifier entry

Validation

0: OAZ(MCCFI1) is the current comparator entry

1: MCCFI0 is the current comparator entry

Bits 4:3 = HFE[1:0]: Chopping mode selection

These bits select the chopping mode as shown in

the following table.

Table 71. Chopping mode

Bits 2:0 = HFRQ[2:0] : Chopper frequency selec-

tion

These bits select the chopping frequency.

Table 72. Chopping frequency selection

Note: The chopper signal has a 50% duty cycle.

654

HST

CFAV

HFE1

HFE0 HFRQ2 HFRQ1 HFRQ0

HFE1

HFE0

Chopping mode

OFF

On Low channels only

On High channels only

Both High and Low channels

HFRQ2 HFRQ1 HFRQ0

Chopping

frequency

Fmtc = 16MHz

Fmtc = 8MHz

Chopping

frequency

Fmtc = 4MHz

100 KHz

50 KHz

200 KHz

100 KHz

400 KHz

200 KHz

500 KHz

250 KHz

800 KHz

400 KHz

1 MHz

500 KHz

1.33 MHz

666.66 MHz

2 MHz

1 MHz

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