AMIS30621C6213RG ON Semiconductor, AMIS30621C6213RG Datasheet - Page 32

• Manufacturer Part Number: AMIS30621C6213RG
• Description: IC MOTOR DRIVER/CTLR 20-SOIC
• Manufacturer: ON Semiconductor

Specifications of AMIS30621C6213RG

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: 800mA
• Voltage - Supply: 6.5 V ~ 29 V
• Operating Temperature: -40°C ~ 165°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Motor Stopping Phase
maintained in the coils at their actual DC level (hence
keeping the sine/cosine ratio between coils) during the
stabilization time t
Charge Pump Monitoring
If the charge pump voltage is not sufficient for driving the
high side transistors (due to a failure), an internal
HardStop command is issued. This is acknowledged to
the master by raising flag <CPFail> (available with
command GetFullStatus).
flag <StepLoss> is also raised.
Electrical Defect on Coils, Detection and Confirmation
at least one transistor of the H−bridge. Then the decision is
taken to open the transistors of the defective bridge.
This allows the detection the following short circuits:
•
•
•
value during one electrical period with duration, determined
by Vmin.
Table 22. ELECTRICAL DEFECT DETECTION
Yi or Xi
Yi or Xi
Yi or Xi
Y1 and Y2
X1 and X2
Xi and Yi
At the end of the deceleration phase, the currents are
In case this failure occurs while a motion is ongoing, the
The principle relies on the detection of a voltage drop on
Open circuits are detected by 100% PWM duty cycle
External coil short circuit
Short between one terminal of the coil and Vbat or
GND
One cannot detect an internal short in the motor.
Pins
Iy
Ix
Short circuit to GND
Short circuit to Vbat
Open
Short circuited
Short circuited
Short circuited
stab
(see AC Table). The currents are then
Fault mode
Figure 20. Motor Stopping Phase
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32
set
sin(TagPos) and Ihold x cos(TagPos), as
illustrated below. A new positioning order can then be
executed.
Motor Shutdown Mode
A motor shutdown occurs when:
•
•
•
•
A motor shutdown leads to the following:
•
•
•
The conditions to get out of a motor shutdown mode are:
•
•
This leads to H−bridges going 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 example. The master can check whether there is
a problem or not and decide which application strategy to
adopt.
The chip temperature rises above the thermal shutdown
threshold Ttsd (see Thermal Shutdown Mode).
The battery voltage goes below UV2 (see Battery
Voltage Management).
The charge pump voltage goes below the charge pump
comparator level Flag <CPFail> = ‘1’, meaning there is
a charge pump failure.
Flag <ElDef> = ‘1’, meaning an electrical problem is
detected on one or both coils, e.g. a short circuit.
H−bridges in high impedance mode.
The <TagPos> register is loaded with the
<ActPos>.
The LIN interface remains active, being able to receive
orders or send status.
Reception of a GetStatus or GetFullStatus
command AND
The four above causes are no longer detected
to
the
hold
values,
t stab
respectively
Ihold
t
x