ATA6830-PKHW Atmel, ATA6830-PKHW Datasheet - Page 15

• Manufacturer Part Number: ATA6830-PKHW
• Description: Motor / Motion / Ignition Controllers & Drivers IC Automotive for Headlamp Adjustment
• Manufacturer: Atmel
• Type: 2 Phase Stepper Motor Driverr

Specifications of ATA6830-PKHW

• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 7 V to 20 V
• Supply Current: 7 mA
• Mounting Style: SMD/SMT
• Package / Case: QFN-28
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.11
4575D–BCD–09/05
Exception Handling
During operation, different exceptional states or errors can arise to which the circuit must corre-
spondingly react. These are described below:
Figure 3-13. Error Signal Timing
• Supply voltage below 9V
• Supply voltage above 20V
• Overtemperature warning
• Overtemperature shut-off
• Interruption of a stepping motor winding
• Short circuit of a stepping motor winding
• Short circuit of an output to ground or V
Travel operation is suspended for the duration of the undervoltage. The output current will
be set to zero. When the supply voltage rises above 10.5V, 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 20V, travel operation restarts.
The maximum stepping speed is reduced to 300 Hz. This ensures a safe shut-off procedure
if the temperature increases to shut-off temperature.
Travel operation is suspended when overtemperature is detected. An error signal is sent to
the bus master via the bus. Operation can only restart after the supply voltage is shut off.
The motor windings are only checked for interruption when supplied with hold current, not
during drive operation. The corresponding output is shut off. The other coil winding is sup-
plied with hold current. An error signal is sent. Operation can only restart after the supply
voltage is shut off.
The corresponding output is shut off. The other coil winding is supplied with hold current. An
error signal is sent. Operation can only restart after the supply voltage is shut off.
The corresponding output is shut off. The other coil winding is supplied with hold current. An
error signal is sent. Operation can only restart after the supply voltage is shut off.
An error signal is sent to the microcontroller by clamping the bus to ground for 3 seconds. If
the error should occur during a data transmission, the above described reactions will hap-
pen immediately except for the clamping. This will take place about 200 µs after the end of
the stopbit of the low byte to guarantee a correct command recognintion in the second head-
lamp. The error signal timing is shown in
1
Buslevel
0
MESSAGE FRAME
ca. 9.2 ms
BAT
Figure
3-13.
ERROR RESPONSE
3 s
ATA6830
15