ST7MC1 datasheet(213/308 Pages) STMICROELECTRONICS

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ST7MC1/ST7MC2

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MOTOR CONTROLLER (Cont’d)

Bits 2:0 = VR[2:0]: BEMF/demagnetisation Refer-

ence threshold

These bits select the Vref value as shown in the

Table 64. The Vref value is used for BEMF and

Demagnetisation detection.

Table 64. Threshold voltage setting

*Typical values for VDD=5V

PHASE STATE REGISTER (MPHST)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7:6 = IS[1:0]*: Input Selection bits

These bits mainly select the input to connect to

comparator as shown in Table 65. The fourth con-

figuration (IS[1:0] = 11) specifies that an incremen-

tal encoder is used (in that case MCIA and MCIB

digital signals are directly connected to the incre-

mental encoder interface and the analog multi-

plexer is bypassed.

Table 65. Input Channel Selection

Bits 5:0 =OO[5:0]*: Channel On/Off bits

These bits are used to switch channels on/off at

the next C event if the DAC bit =0 or directly if

DAC=1

0: Channel Off, the relevant switch is OFF, no

PWM possible

1: Channel On the relevant switch is ON, PWM is

possible (not signifiant when PCN or DTE bit is

set).

Table 66. OO[5:0] Bit Meaning

* Preload bits, new value taken into account at

next C event.

Caution: As the MPHST register contains bits with

preload, the whole register has to be written at

once. This means that a Bit Set or Bit Reset in-

struction on only one bit without preload will have

the effect of resetting all the bits with preload.

VR2

VR1

VR0

Vref voltage threshold

111

Threshold voltage set by ex-

ternal MCVREF pin

3.5V*

2.5V*

100

2V*

1.5V*

010

1V*

0.6V*

0.2V*

IS1*

IS0*

OO5*

OO4*

OO3*

OO2*

OO1*

OO0*

IS1

IS0

Channel selected

MCIA

MCIB

MCIC

Both MCIA and MCIB: Encoder Mode

OO[5:0]

Output Channel State

Inactive

1Active

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