ST7MC2N6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST7MC2N6

8-bit MCU with nested interrupts, Flash, 10-bit ADC, brushless motor control, five timers, SPI, LINSCI™

STMicroelectronics 

ST7MC1xx/ST7MC2xx

MOTOR CONTROLLER (Cont’d)

REFERENCE REGISTER (MREF)

Read/Write

Reset Value: 0000 0000 (00h)

7

6

5

4

3

2

1

0

HST CL CFAV HFE1 HFE0 HFRQ2 HFRQ1 HFRQ0

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

HFE1

0

0

1

1

HFE0

0

1

0

1

Chopping mode

OFF

On Low channels only

On High channels only

Both High and Low channels

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

tion

These bits select the chopping frequency.

Table 72. Chopping frequency selection

Chopping

frequency

HFRQ2 HFRQ1 HFRQ0

Fmtc = 16MHz

Fmtc = 8MHz

0

0

0

100 KHz

Chopping

frequency

Fmtc = 4MHz

50 KHz

0

0

1

200 KHz

100 KHz

0

1

0

400 KHz

200 KHz

0

1

1

500 KHz

250 KHz

1

0

0

800 KHz

400 KHz

1

0

1

1 MHz

500 KHz

1

1

0

1.33 MHz 666.66 MHz

1

1

1

2 MHz

1 MHz

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

217/309

Share Link: