L6238 datasheet(33/35 Pages) STMICROELECTRONICS

33 / 35 page

Table 9 (continued)

Status Bit #

Signal Name

Control Function Description

Log ic

Default State

Align

Separates the alignment times during start-

up. While low, the rotor will align to phase 1.

When high, the rotor will align to phase 3

until pllaced in the Go mode.

1 = 2nd

Alignment

0 = 1st

Alignment

Indication of motor Phase relative to Fref.

(Must be used in conjunction with

Up).

1 = Phase > 0

0 = Phase

≤ 0

Indication of motor Phase relative to Fref.

(Must be used in conjunction with

Dn).

1 = Phase > 0

0 = Phase

≥ 0

Updn

Indicates whether the motor‘s frequency is

greater or less than the reference

frequency.

1 = Fref > Fmtr

0 = Fref < Fmtr

Lock

Determines if Phase Difference is within

threshold limits as set by control bits.

1 = In Phase

0 = Out of Phase

Spin_

Sense

This bit toggles at the zero crossing

Toggles

St krt r

Detects a fault due to motor failing to spin.

If upon entering the Go mode after the

double align, no generated Bemf is

detected, a 419ms timer, (Fsystem =

10MHz) will cause the outputs to tri-state

and flag a fault.

1 = Normal

0 = Fault

IntFmtr

This signal cycles once every revolution,

providing a source of feedback for the

phase detector to lock onto. This signal is

not used when EXT/INT or

Ext/Int are a

logic 1.

1 cycle = 1

revolution

OTshdown

Indicates an overtemperature fault. Output

stage tristates.

1 = Normal

0 = Overtemp

OTw arn

Early overtemperature warning signal.

1 = Normal

0 = Overtemp

Mono

Indicates a fault due to a rapid deceleration

of the rotor caused by a sudden frictional

1 = Normal

0 = Fault

L6238

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