ST72141K2 datasheet(71/132 Pages) STMICROELECTRONICS

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ST72141K

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MOTOR CONTROLLER (Cont’d)

PHASE STATE REGISTER (MPHST)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:6 = IS[1:0]*:

Input Selection bits

These bits select the input to connect to compara-

tor as shown in the following table:

Table 33. 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.

Table 34. OO[5:0] Bit Meaning

* Preload bits, new value taken into account at

next C event.

PARITY REGISTER (MPAR)

Read/Write

Reset Value: 0000 0000 (00h)

Bit 7 = ZVD:

Z vs D edge polarity.

0: Zero-crossing and End of Demagnetisation

have opposite edges

1: Zero-crossing and End of Demagnetisation

have same edge

Bit 6 = REO:

Read on Even or Odd channel bit

0: Read the BEMF signal during the off time on

even channels

1: Read on odd channels

Bits 5:0 = OE[5:0]:

Output Parity Mode.

0: Output channel is Even

1: Output channel Odd

POLARITY REGISTER (MPOL)

Read/Write

Reset Value: 0000 0000 (00h)

Bits 7:6 = OT[1:0]:

Off Time selection.

These bits are used to select the off time in sen-

sorless mode as shown in the following table.

Table 35. Off-Time bit Meaning

Bits 5:0 = OP[5:0]:

Output channel polarity.

These bits are used together with the OO[5:0] bits

in the MPHST register to control the output chan-

nels.

0: Output channel is Active Low

1: Output channel is Active High.

Table 36. Output Channel State Control

IS1*

IS0*

OO5*

OO4*

OO3*

OO2*

OO1*

OO0*

IS1

IS0

Channel selected

MCIA

MCIB

MCIC

Not Used

OO[5:0]

Output Channel State

Inactive

Active

ZVD

REO

OE5OE4

OE3OE2

OE1OE0

OT1

OT0

OP5

OP4

OP3

OP2

OP1

OP0

OT1

OT0

Off-Time

Sensorless

Mode (SR=0)

Off-Time

Sensor Mode

(SR=1)

µs

1.25

µs

OP[5:0] bit

OO[5:0] bit

MCO[5:0] pin

1 (Off)

0 (PWM possible)

0 (Off)

1 (PWM possible)

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