Data brief

For further information contact your local STMicroelectronics sales office.

November 2010

Doc ID 18274 Rev 1

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STEVAL-SPMD250V2

1.5 A bipolar stepper motor drive module (SPMD150STP)

demonstration board

Features

demonstration

– Normal/half-step sequence and

microstepping

– Fast/slow decay

– Forward/reverse

– Enable

acceleration/deceleration ramp, running and

stop mode

sequences

Description

This STEVAL-SPMD250V2 demonstration board

is designed for evaluating the performance and

the features of the SPMD250STP module. The

board works in conjunction with the PractiSPIN™

HW and the PractiSPIN™.spmd SW, which allow

the user to operate with the SPMD250STP

module.

The SPMD250STP is part of the EASY

POWER™ series of fully integrated modules

designed to drive bipolar permanent-magnet

stepper motors.

All EASY POWER modules offer an easy-to-use,

fully-protected solution to implement precise

position control, with high torque at rest, and

without the need for external components. The

module operates over a wide 12 V to 40 V input

voltage range and supports an output maximum

current of 2.5 A.

The SPMD250STP implements full/half-step drive

capability, working at a fixed chopper frequency of

17 kHz. It is possible to select between fast and

slow decay current. Home position indication is

available, as well as synchronization for multi-

motor applications. The module internally

generates the phase sequence, significantly

reducing the burden of the controller. Integration

of a power MOSFET stage significantly reduces

both commutation and conduction losses. The

SPMD250STP offers complete output protection

against all types of short conditions. The metal

package acts as an integrated heatsink, with no

ventilation or additional components required.

The metal case also isolates the inner circuit from

external agents, making the module suitable for

operation in harsh environments. The STEVAL-

SPMD250V1 supports the following

measurements and demonstrations: full/half-step,

CW/CCW, control behavior, motor current

waveforms and measurements, movement

sequences.

STEVAL-SPMD250V2

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