SPMD250STP STMicroelectronics, SPMD250STP Datasheet - Page 10

• Manufacturer Part Number: SPMD250STP
• Description: MOD STEPPER MOTOR DRV 2.5A BIPO
• Manufacturer: STMicroelectronics
• Series: EASY POWER™r
• Type: Stepper Motor Driverr

Specifications of SPMD250STP

• Motor Type: Stepper, Bipolar
• Number Of Motors: 1
• Voltage - Output: 40V
• Voltage - Logic Supply: 4.5 V ~ 5.5 V
• Current - Output: 2.5A
• Transistor Type: MOSFET
• Termination Style: PC Pin
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 12V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 40V
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 5 V
• Mounting Style: SMD/SMT
• For Use With: 497-10050 - BOARD EVAL SPMD250497-9011 - DEMO SYSTEM BASED ON SPMD250STP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8416

Bipolar stepper motor basics
5
5.1
5.2
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Bipolar stepper motor basics
Simplified to the bare essentials, a bipolar permanent magnet motor consists of a rotating-
permanent magnet surrounded by stator poles carrying the windings
Figure 5.
Bidirectional drive current is imposed on windings A-B and C-D and the motor is stepped by
commutating the voltage applied to the windings in sequence. For a motor of this type there
are three possible drive sequences.
One-phase-on or wave drive
Only one winding is energized at any given time according to the sequence :
AB - CD - BA - DC
(BA means that the current is flowing from B to A).
Figure 6
Two-phase-on or normal drive
This mode gives the highest torque since two windings are energized at any given time
according to the sequence (for clockwise rotation).
AB & CD ; CD & BA ; BA & DC ; DC & AB
Figure 7
shows the sequence for a clockwise rotation and the corresponding rotor position.
shows the sequence and the corresponding position of the rotor.
Simplified bipolar two phase motor
Doc ID 14350 Rev 2
(Figure
SPMD250STP
5).