ST7MC1K2-Auto datasheet(275/371 Pages) STMICROELECTRONICS

275 / 371 page

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

On-chip peripherals

275/371

Reference register (MREF)

MREF

Reset value: 0000 0000 (00h)

654

HST

CFAV

HFE[1:0]

HFRQ[2:0]

R/W

Table 142.

MREF register description

Bit

Name

Function

HST

Hysteresis comparator value

This read only bit contains the hysteresis comparator output.

0: Demagnetization/BEMF comparator is under VREF

1: Demagnetization/BEMF comparator is above VREF

6CL

Current loop comparator value

This read only bit contains the current loop comparator output value.

0: Current detect voltage is under VCREF

1: Current detect voltage is above VCREF

5CFAV

Current feedback amplifier entry validation

0: OAZ(MCCFI1) is the current comparator entry

1: MCCFI0 is the current comparator entry

4:3

HFE[1:0]

Chopping mode selection

These bits select the chopping mode:

00: Chopping mode = off

01: Chopping mode = on low channels only

10: On high channels only

11: Both high and low channels

2:0 HFRQ[2:0]

Chopper frequency selection

These bits select the chopping frequency (see Table 143).

Table 143.

Chopping frequency selection(1)

The chopper signal has a 50% duty cycle.

HFRQ2

HFRQ1

HFRQ0

Chopping frequency

Fmtc = 16MHz

Fmtc =8MHz

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

Obsolete

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