AMIS-30624 AMI Semiconductor, Inc., AMIS-30624 Datasheet - Page 36

• Manufacturer Part Number: AMIS-30624
• Description: I2c Microstepping Motordriver
• Manufacturer: AMI Semiconductor, Inc.

AMIS-30624 I
15.3.8. Motor Shutdown Mode
A motor shutdown occurs when:
A motor shutdown leads to the following:
The I
The conditions to get out of a motor shutdown mode are:
This 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.
Important: While in shutdown mode, since there is no hold current in the coils, the mechanical load can cause a step loss, which
cannot be flagged by the AMIS-30624.
Warning: The application should limit the number of consecutive
shutdown mode. When this proves to be unsuccessful, for example if there is a permanent defect, the reliability of the circuit could be
altered since
AMI Semiconductor – Apr. 2007, Rev 3.1, M-20664-003
www.amis.com
2
C interface remains active, being able to receive orders or send status.
• The chip temperature rises above the thermal shutdown threshold Ttsd (see
• The battery voltage goes below UV2 (see
• 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
• H-bridges in high impedance mode
• The TagPos register is loaded with the ActPos (to avoid any motion after leaving the motor shutdown mode)
• Reception of a
• The four causes above are no longer detected
GetFullStatus1
- The circuit is driven in
- The application is not
<ElDef> = ‘1’ or
<CpFail> = ‘1’
motor shutdown
mode
aware of this
Vbb ≤ UV2 or
Tj ≥ Tsd or
GetFullStatus1
↓
2
Figure 21: Example of Possible Sequence Used to Detect and Determine Cause of Motor Shutdown
C Microstepping Motordriver
attempts to disable the protection of the H-bridges.
- The position set-point
- Motor shutdown
- The application is still
command AND
SetPosition
is updated by the
I
mode ⇒ no motion
unaware
2
C Master
frame
Battery Voltage
↑
36
Management)
GetFullStatus1
- The application is
- Reset <TW> or <TSD> or <UV2> or <StepLoss>
- Possible new detection of over temperature or
GetFullStatus1
aware of a problem
or <ElDef> or <CPFail> by the application
low voltage or electrical problem ⇒ Circuit
sets <TW> or <TSD> or <UV2> or
<StepLoss> or <ElDef> or <CPFail>
again at ‘1’
frame
↑
Thermal Shutdown
commands to try to get the AMIS-30624 out of
- Possible confirmation
GetFullStatus1
of the problem
↑…
frame
Mode)
Data Sheet