ATA6830-PKHW Atmel, ATA6830-PKHW Datasheet - Page 4

• 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. Functional Description
3.1
4
Analog Part
ATA6830
Figure 3-1.
The circuit contains an integrated 5V regulator to supply the internal logic and analog circuit
blocks. The regulator uses an adjusted bandgap as voltage reference. Also all other parts that
require an excellent voltage reference, such as the voltage monitoring block refer to the
bandgap.
The bias generator derives its accurate currents from an external reference resistor. The oscilla-
tor is used for clocking the digital system. All timings like the baud rate, the step duration and the
chopper frequency are determined from it. An external capacitor is used for generating the
frequency.
The voltage monitoring enables the circuit to drive the stepping motor at different battery voltage
levels. According to the battery voltage the stepping motor will be accelerated to a maximum
step velocity. In case of under or over voltage the motor will shut off. A temperature monitoring is
used for shut off at overtemperature conditions and current boost in case of low temperature.
Oscillator
COS
Analog Blocks
Generator
RSET
Bias
Bandgap
AGND
VBAT
Regulator
Voltage
VSS
VDD
Supervisor
Voltage
Temperature
Supervisor
Temperature Levels
Voltage Levels
Supply
Clock
Reset
Bias
4575D–BCD–09/05