L6238 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6238' PDF : 35 Pages View PDF
Table 5: Control Register.
Ctrl
Bit #
0
Signal
Name
Ext/Int
1
Fref Enable
2
Lock_
Thrsh_0
3
Lock_
Thrsh_1
4
Linear
5
Out_Ena
6
Run/Brake
7
Seq_Reset
8
Auto/Ext
9
Seq_Incr
10
Phase_
Delay_0
11
Phase_
Delay_1
12
Phase_
Delay_2
13
Auto_Str_
Dly_0
14
Auto_Str_
Dly_1
15
Ilim_Gain
Control Function Description
Log ic
Determines whether the once-per-
revolution signal (used as the motor’s
feedback for speed) comes from internally
generated source or is to be supplied
externally as an input.
When enabled, passes external PLL fref to
Phase Detector
Two bits that set the Lock Signal threshold
in the Phase Detector
0 = Use Int
Speed Fdbk
1 = Use Ext
Speed Fdbk
0 = Enable
1 = Disable
Refer to Table 7
Not used.
Enables Output Drivers. When this signal is
used to Tri-State the outputs, it also resets
the resynchronization algorithm.
This bit along with the OUTPUT ENABLE
pin forms a logical AND function.
When brought high, initiates the Align and
Go algorithm. When low, Brake action
occurs after the Brake Delay Timeout.
This bit along with the RUN/BRAKE pin
forms a logical AND function.
Resets the sequencer to Phase 1. Reset
when in Brake Mode.
Selects either the Internal Auto Start-Up or
External Algorithm.
Increments sequencer
Three bits that set the Delay between the
detection of the Bemf zero crossing and
the commutation to the next phase.
0 = Required
0 = Enable
1 = Disable
1 = Run
0 = Brake
1 = Reset
0 = Normal
1 = Auto
0 = External
1 = Mask Bemf
0 = Normal
Refer to Table 6
These 2 Bits define 4 possible delayes for Refer to Table 8
Auto Start-Up Algorithm.
Programs the I Limit for either the value set
by ILIM SET or /2
0 = Ilimit
1 = Ilimit/2
L6238
Default
State
0
0
1
1
0
1
1
0
1
0
1
0
1
1
1
0
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