AMIS-30623 Datasheet, PDF (48/65 Pages) AMI SEMICONDUCTOR – LIN Microstepping Motordriver

AMIS-30623
B
FailSafe = 1
No
Yes
First motion of DualPosition
Half the position range
Negative direction
At Stall -> ActPos = '0000'
No
SecPos ≠ 0x400
SleepEn = 1
No
STOP
Yes
Yes
Secure Positioning
to SecPos stored in OTP
SLEEP
Figure 29: Case B: LIN Lost at or During Start-up
STOP
If LIN is lost before or at power on, following sequence will be followed. See also Figure 29.
1. If the LIN communication is lost AND FailSafe = 0 there will be no secure positioning. Depending on SleepEn AMIS-30623 will
enter the STOP state or the SLEEP state. See Table 32.
2. If the LIN communication is lost AND FailSafe = 1 a referencing is started using DualPositioning. A negative motion for half the
positioner range is initiated until the stall position is reached. The motion parameters stored in OTP will be used for this. After
this mechanical end position is reached ActPos will be reset to zero. The direction of the motion is given by the Shaft bit.
ƒ If SecPos[10:0] = 0x400:
no Second Motion will be performed.
Depending on SleepEn AMIS-30623 will enter the STOP state or the SLEEP state. See Table 32.
ƒ If SecPos[10:0] ≠ 0x400:
A second motion to SecPos is performed. The direction is given by SecPos[10] in combination with Shaft. Motion is
done with parameters from OTP.
Important remarks:
(1) The Secure Position has only a resolution of 9 bit because only the 9 MSB’s will be copied from OTP to RAM.
See also Secure Position
(2) The motion direction to SecPos is given by the Shaft bit in OTP
(3) Same behavior in case of HW2 float (= lost LIN address). See also Hardwired Address HW2
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