Application Notes
172
Atlas® Digital Amplifier Complete Technical Reference
B
B.3
Step Motor Atlas Operating In
Pulse & Direction Mode
The following schematic shows Atlas operated in pulse & direction mode controlled by a single axis Magellan. Note
that any source of pulse & direction signals, such as a microprocessor or other dedicated motion control IC, may be
substituted for the Magellan in this schematic.
B.3.1
Atlas Power Input and Motor Outputs
Atlas is powered through pin pairs HV and Pwr_Gnd, and the power source is a transformer-isolated DC power
supply.
For step motors pins MotorA, MotorB, MotorC and MotorD are wired to motor windings A+, A-, B+ and B-,
respectively.
Please refer to B.1 for layout and wiring recommendations on power input and motor outputs.
B.3.2
Atlas Pulse & Direction Interface
When in pulse & direction signal mode, Atlas receives pulse, direction and AtRest signals as shown in the schematic.
When operated in pulse & direction signal mode SPI communications are not available.
B.3.3
Atlas ~Enable and FaultOut Signals
Atlas has one dedicated input signal, ~Enable, which must be pulled low for the Atlas output stage to be active.
FaultOut is a dedicated output. During normal operation it outputs low. When a fault occurs it will go into a high
impedance state. In this example, FaultOut is pulled up by Vpullup through resistor R1. Vpullup can be up to 24V to
meet the system requirement. For example, if the fault signal is wired to a 5V TTL input, Vpullup can be 5V.
B.3.4
Magellan MC54113 Configuration
In this schematic the SPI master is a single-axis Magellan MC54113 configured for pulse & direction signal output.
Only the connections with Atlas are shown. For complete Magellan wiring, please refer to the MC58113 electrical
specifications.
