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參數(shù)資料
| 型號： | AMIS-30621-AGA |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.8 A, PDSO20 |
| 封裝： | 300 INCH, PLASTIC, SOIC-20 |
| 文件頁數(shù)： | 28/57頁 |
| 文件大?。?/td> | 1017K |
| 代理商： | AMIS-30621-AGA |
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AMIS-30621 LIN Micro-stepping Motor Driver
Data Sheet
34
AMI Semiconductor
– Sept. 2007, Rev 1.5
www.amis.com
Table 21: Electrical Defect Detection
Pins
Fault Mode
Yi or Xi
Short circuit to GND
Yi or Xi
Short circuit to Vbat
Yi or Xi
Open
Y1 and Y2
Short circuited
X1 and X2
Short circuited
Xi and Yi
Short circuited
14.3.7. Motor Shutdown Mode
A motor shutdown occurs when:
The chip temperature rises above the thermal shutdown threshold Ttsd (see Thermal Shutdown Mode).
The battery voltage goes below UV2 (see Battery Under-Voltage Management).
Flag <ElDef> = ‘1’, meaning an electrical problem is detected on one or both coils, e.g. a short circuit.
Flag <CPFail> = ‘1’, meaning there is a charge pump failure.
A motor shutdown leads to the following:
H-bridges in high impedance mode.
The TagPos register is loaded with the ActPos (to avoid any motion after leaving the motor shutdown mode).
The LIN interface remains active, being able to receive orders or send status.
The conditions to get out of a motor shutdown mode are:
Reception of a GetStatus or GetFullStatus command AND
The four above causes are no more detected
Which leads to H-bridges in Ihold mode. Hence, the circuit is ready to execute any positioning command.
This can be illustrated in the following sequence given as an application tip. The master can check whether there is a problem or not
and decide which application strategy to adopt.
Tj
≥ Tsd or
Vbb
≤ UV2 or
<ElDef> = ‘1’ or
<CpFail> = ‘1’
↓
SetPosition
frame
↑
GetFullStatus
or
GetStatus
frame
↑
GetFullStatus
or
GetStatus
frame
↑…
- The application is
aware of a problem
- Possible confirmation
of the problem
- The circuit is driven in
motor shutdown
mode
- The application is not
aware of this
- The position set-point
is updated by the
LIN Master
- Motor shutdown
mode
no motion
- The application is still
unaware
- Reset <TW> or <TSD> or <UV2> or <StepLoss>
or <ElDef> or <CPFail> by the application
- Possible new detection of over temperature or
low voltage or electrical problem
Circuit
sets <TW> or <TSD> or <UV2> or
<StepLoss> or <ElDef> or <CPFail>
again at ‘1’
Figure 22: Example of Possible Sequence Used to Detect and Determine Cause of Motor Shutdown
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