ATA6830-PKHW Atmel, ATA6830-PKHW Datasheet - Page 13

• 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

3.9
4575D–BCD–09/05
Step Operation
In addition to the actual step frequency there is a maximum step frequency up to which the
actual step frequency can rise. To secure a correct operation at low supply voltages the maxi-
mum value for the stepping frequency is smaller at low voltages. If the supply voltage falls below
the 9V threshold, travel operation will suspend. To restart operation, the supply voltage has to
rise above 10.5V. The relation of the maximum step frequency and the supply voltage during
operation is shown in
If the chip temperature exceeds the overtemperature warning threshold, the step speed is
reduced to 300 Hz. If the chip temperature rises further the output driver is shut off.
Table 3-4.
The stepping motor is operated in halfstep-compensation mode. The current for both coils is
shown in
secure operation. For final tests at the end of the application production line the currents are
reduced.
Figure 3-10. Compensated Halfstep Operation
V
< 9V
9V to 9.5V
9.5V to 10V
10V to 10.5V
10.5V to 11V
> 11V
> 20V
BAT
Figure
Maximum Step Frequency
3-10. The current levels are increased when the temperature is below 0°C to
coil B
coil A
-500mA
-700mA
-500mA
-700mA
700mA
500mA
700mA
500mA
Table
1
Maximum Step Frequency
at Rising Voltage
No operation
No operation
No operation
No operation
850 Hz (1.17 ms)
1000 Hz (1 ms)
No operation
3-4.
2
3
4
5
6
7
Maximum Step Frequency
(V
No operation
300 Hz (3.33 ms)
500 Hz (2.03 ms)
680 Hz (1,47 ms)
850 Hz (1.17 ms)
1000 Hz (1 ms)
No operation
BAT
8
once > 10.5V)
half steps
half steps
ATA6830
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