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PDF ATA6830 Data sheet ( Hoja de datos )
| Número de pieza | ATA6830 | |
| Descripción | INTELLIGENT STEPPER MOTOR DRIVER | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• 2-Phase 1 A Stepping Motor Driver
• Compensated Half Step Operation
• Chopper Current Control
• Unidirectional Single Wire Bus Interface with Error Feedback
• Intelligent Travel Operation Control
• Referencing by Extending or Retracting
Application
• Dynamic Headlamp Adjustment
Benefits
• Error Recognition with Feedback
• Short Circuit Protected Outputs
• Overtemperature Warning and Shut Off
• Supply Voltage Supervision
Electrostatic sensitive device.
Observe precautions for handling.
Intelligent
Stepper Motor
Driver
ATA6830
Description
The circuit serves to control a stepping motor for dynamic headlamp beam adjustment
in automobiles. Two chopper-controlled H-bridges serve as the stepping motor driver.
The circuit receives the commands to control the stepping motor by means of a unidi-
rectional serial single-wire bus.
An integrated process control independently moves the stepping motor into the new
desired position. This allows it to be automatically accelerated and slowed down. The
stepping motor is operated in compensated half-step operation. The maximum clock
frequency at which the stepping motor is operated depends on the supply voltage, the
chip temperature, the operating mode, and position difference.
Rev. 4575C–BCD–05/03
1
1 page  
ATA6830
Digital Part
Figure 4. Digital Blocks
BUS
VREF
Clk
Reset
Voltage Levels
Step Time Memory
Maximum Step Time
New Step Time
Actual Step Time
UART
Clock
Recovery
Bitstream
Recovery
shiftclk
bitstream
rxd
Data
Recognition
&
Parity-Check
reference run
new position
Cruise Control
Temperature Signals
Error Signals
Stepper Motor Control
Error Timer
Error Signals
Desired Position
Instantaneous Position
Figure 4 shows all digital blocks of the circuit. The stepping motor will be controlled by
commands via the bus input pin. An analog comparator is used as a level shifter at the
input. There is also a possibility of clamping the bus pin to ground. This will be used after
detecting an error to feedback this to the microcontroller.
The next block is a UART. Its task is clock recovery and data recognition of the incoming
bit stream. For clock recovery a special bitstream is used after each power on. The gen-
erated bitstream will be analyzed and after a correct parity check interpreted for
execution.
A sophisticated cruise control generates all control signals for the two H-bridge drivers.
It uses an internal step-time table for accelerating and decelerating the stepping motor
depending on the actual and desired position and the temperature and voltage levels.
Exception handling is integrated to interpret and react on the temperature, supply volt-
age, and coil-current signals from the analog part.
4575C–BCD–05/03
5
5 Page 
Reference Run
Cruise Control
ATA6830
In normal operation, new position commands are transmitted as absolute values. To
drive the stepping motor to these absolute positions, the circuit has to know the motor’s
zero position. Therefore, the stepping motor has to perform a reference run after each
power-up in which it is extended or retracted to its limit stop. Before the execution of the
reference run, the motor is supplied with hold current.
As the actual position is not known at the beginning of the reference run the whole posi-
tion range has to be passed. To optimize performance for smaller actuators, the
reference run has been reduced to 698 steps. Therefore, it is prohibited to access posi-
tions higher than 698, because in a following reference run the stepping motor would not
reach its zero position.
If it is necessary that the entire range up to position 1024 can be used, the reference run
has to be executed twice. Since any command during reference run is ignored, the sec-
ond reference command has to be sent about 2.4 s after the first command.
To avoid any possible mistake, e.g., the loss of a step during the reference run or the
bouncing at the limit stop, there is a special run to be executed.
This is shown in Table 2.
Table 2. Reference Run Course
Phase Action
Ramp up to 446 Hz step frequency
Drive
I through
Drive at constant speed
the
whole
Ramp down to minimum step
frequency (303 Hz)
II
III
range
(698
steps)
IV Wait for 6 ´ 3300 µs with the last coil current
V Perform another 6 steps with 3300 µs
VI Wait for 5 ´ 3300 µs with the last coil current
VII Set current to hold current; normal operation
Int. Counter
704
703
702
701
700 to 11
10
9
8
7 to 6
6
5 to 0
0
varied
Steptime
3300 µs
2895 µs
2540 µs
2240 µs
2240 µs
2240 µs
2549 µs
2895 µs
3300 µs
3300 µs
3300 µs
3300 µs
varied
The travel operation control independently moves the stepping motor into its new posi-
tion. To reach the new position as fast as possible but without abrupt velocity changes,
the stepping motor is accelerated or slowed down depending on the difference between
actual and nominal position. If this difference is huge the stepping frequency will
increase (acceleration). When the new position is nearly reached, the frequency will
decrease again (deceleration). In the case of a new nominal position opposite to the
direction of the motion being from the microcontroller, the stepping frequency will
decrease to its starting value (300 Hz) before the direction can turn. The cruise control is
shown in Figure 11.
The possible stepping frequencies for velocity control are shown in Table 3.
4575C–BCD–05/03
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ATA6830.PDF ] | |
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