L6238
Table 9 (continued)
Status Bit #
5
Signal Name
Align
6
Dn
7
Up
8
Updn
9
Lock
10
Spin_
Sense
11
St krt r
12
IntFmtr
13
OTs h dow n
14
OTw arn
15
Mono
Control Function Description
Log ic
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
Indicates whether the motor‘s frequency is
greater or less than the reference
frequency.
1 = Fref > Fmtr
0 = Fref < Fmtr
Determines if Phase Difference is within
threshold limits as set by control bits.
1 = In Phase
0 = Out of Phase
This bit toggles at the zero crossing
Toggles
Default State
1
1
0
1
0
0
Detects a fault due to motor failing to spin.
1 = Normal
1
If upon entering the Go mode after the
0 = Fault
double align, no generated Bemf is
detected, a 419ms timer, (Fsystem =
10MHz) will cause the outputs to tri-state
and flag a fault.
This signal cycles once every revolution,
1 cycle = 1
0
providing a source of feedback for the
revolution
phase detector to lock onto. This signal is
not used when EXT/INT or Ext/Int are a
logic 1.
Indicates an overtemperature fault. Output
1 = Normal
1
stage tristates.
0 = Overtemp
Early overtemperature warning signal.
1 = Normal
1
0 = Overtemp
Indicates a fault due to a rapid deceleration 1 = Normal
1
of the rotor caused by a sudden frictional
0 = Fault
loading.
33/35