AMIS-30623 AMI Semiconductor, Inc., AMIS-30623 Datasheet - Page 48

• Manufacturer Part Number: AMIS-30623
• Description: Lin Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30623 LIN Microstepping Motordriver
16.8.3. Fail Safe Motion
The OTP bit <FailSafe> enables or disables an automatic motion to a predefined safe position. See also Autonomous Motion.
Table 33: Fail Safe Enable Selection
16.8.4. Autonomous Motion
AMIS-30623 is able to perform an Autonomous Motion to a preferred position. This positioning starts after the detection of lost LIN
communication and in case:
The functional behavior depends if LIN communication is lost during normal operation (see Figure 27 case A) or at (or before) start-up
(See Figure 27 case B):
LIN Lost During Normal Operation
If the LIN communication is lost during normal operation, it is assumed that AMIS-30623 is referenced. In other words the ActPos
register contains the “real” actual position. At LIN – lost an absolute positioning to the stored secure position SecPos is done. This is
further called Secure Positioning.
Following sequence will be followed. See also
Important remarks:
<FailSafe>
AMI Semiconductor – June 2006, Rev 3.0
www.amis.com
1.
2.
3.
(1) The Secure Position has a resolution of 11 bit
(2) Same behavior in case of HW2 float (= lost LIN address). See also
0
1
has updated this. See also
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
If the LIN communication is lost AND FailSafe = 1 there are 2 possibilities:
“SecPos[10:0]” from RAM register will be used. This can be different from OTP register if earlier LIN master communication
Figure 27: Flow chart power-up of AMIS-30623. 2 cases are illustrated; Case A: LIN lost during operation and Case B: LIN lost at start-up
II. If SecPos[10:0] ≠ 0x400:
I. If SecPos[10:0] = 0x400:
no Secure Positioning will be performed
Depending on SleepEn AMIS-30623 will enter the STOP state or the SLEEP state. See
Perform a Secure Positioning. This is an absolute positioning (slave knows its ActPos. SecPos[10:0] will be copied in
TagPos)
Behavior
NO motion in case of LIN – lost
ENABLES motion to a safe position in case of LIN – lost
- the OTP bit <FailSafe> = 1.
- RAM register SecPos[10:0] ≠ 0x400
Secure Position
Figure 28
B
and command SetMotorParam.
No
Table
(LIN communication ON)
32.
OTP content is
copied in RAM
GetFullStatus
LIN bus OK
Power Up
48
Hardwired Address HW2
Yes
A
Table
32.
Data Sheet