ATA6830 ATMEL Corporation, ATA6830 Datasheet - Page 14

• Manufacturer Part Number: ATA6830
• Description: Intelligent Stepper Motor Driver
• Manufacturer: ATMEL Corporation

Exception Handling
14
ATA6830
Figure 13. Chopper Current Control
Figure 14. Current Flow in Halfbridge
During operation, different exceptional states or errors can arise to which the circuit
must correspondingly react. These are described below:
•
Travel operation is suspended for the duration of the undervoltage. The output current
will be set to zero. When the supply voltage rises above 10.5 V, travel operation
restarts.
•
Travel operation is suspended for the duration of the undervoltage. The output current
will be set to zero. When the supply voltage falls below 20 V, travel operation restarts.
•
The maximum stepping speed is reduced to 300 Hz. This ensures a safe shut-off proce-
dure if the temperature increases to shut-off temperature.
•
Supply voltage below 9 V
Supply voltage above 20 V
Overtemperature warning
Overtemperature shut-off
OFF
ON
turn on signal
shunt resistor
comparator
coil current
voltage
flyback
I
max
blanking time
a)
OFF
ON
OFF
ON
4575C–BCD–05/03
b)
ON
OFF