L6238 datasheet(32/35 Pages) STMICROELECTRONICS

32 / 35 page

Table 6: Phase Delay.

Phase_Dly_2

Phase_Dly_1

Phase_Dly_0

Delay, in

Electrical Degrees

000

0.0

001

9.4

18.80

20.68

22.56

24.44 (Default)

26.32

28.20

Table 7: Lock Threshold (Fsys = 10MHz)

Lock_1

Lock_0

Threshold, in

µs

6.4

12.8

25.6

51.2 (Default)

Table 8: Auto-Start Delay.

Auto_Start_Dly_1

Auto_Start_Dly_0

Delay, in Seconds

90Hz Input

60Hz Input

0.711

1.07

1.422

2.13

2.133

3.2

2.844

4.27 (Default)

Table 9: Status Register.

Status Bit #

Signal Name

Control Function Description

Log ic

Default State

Control_0

These two bits are a wrap-around of their

corresponding control bits for test purposes.

Follows

Control_0

Control_1

Follows

Control_1

Mask

When the motor controller detects a zero

crossing,

Mask will go low and remain low

for 15 electrical degrees after the next

commutation.

1 = Detect

Bemf

0 = Mask out

Bemf

1/0

Delay

Upon detection of a zero crossing,

Delay

will go high for a time determined by the

Phase Delay Control bits. After the delay

period,

Delay will go low, initiating the next

commutation.

1 = Delay

Commutation

0/1

Signifies whether the rotor is in the

alignment phase of start-up or is ramping

up to speed

1 = Run

0 = In Start Up

Align

Separates the align

L6238

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