ATA6830 ATMEL Corporation, ATA6830 Datasheet - Page 4

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

Functional Description
Analog Part
4
ATA6830
Figure 3. Analog Blocks
The circuit contains an integrated 5 V 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
oscillator 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 tem-
perature monitoring is used for shut off at overtemperature conditions and current boost
in case of low temperature.
Oscillator
COS
Generator
RSET
Bias
Bandgap
AGND
VBAT
Regulator
Voltage
VSS
VDD
Supervisor
Voltage
Temperature
Supervisor
Temperature Levels
Voltage Levels
4575C–BCD–05/03
Supply
Reset
Clock
Bias