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January 2018

DocID031419 Rev 1

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EVALSP820-XS

Compact evaluation board for STSPIN820 stepper motor driver

Data brief

Features

 Operating voltage: 7 V to 45 V

 Continuous current up to 1.5 A per phase

 Maximum current up to 2.5 A per phase

(HS + LS = 1 Ω typ.)

 Microstep resolution easily settable through

jumpers: full-step, 1/2, 1/4, 1/8, 1/16, 1/32,

1/128 and 1/256 of step

 Simple step and direction control interface

 Adjustable current control through a

potentiometer to set the ref. voltages

 Embedded PWM current control with

selectable decay mode (fast or slow)

 Full set of embedded protections

– Non-dissipative overcurrent

– Undervoltage lockout

– Thermal shutdown

– Short-circuit

 Compatible with RAMPS and similar open

source solutions for FFF 3D printers

 Very compact footprint: 15 x 20 mm

Applications

 3D printers

 Medical equipment

 Textile and sewing machines

 CCTV, security and dome cameras

 Robotics

 ATM and cash handling machines

 Office and home automation

 POS

Description

The EVALSP820-XS is a compact and easy to

use evaluation board for the STSPIN820, the

world's smallest 45 V microstepping motor driver

rated at 2.5 A.

It provides a very compact solution to evaluate

the performance of the STSPIN820 stepper motor

driver with a minimum set of additional equipment

and without the need of additional devices.

The hardware is fully compatible to be used

together with RAMPS or other similar FFF 3D

printing platforms, representing a very fast drop-in

replacement of similar solutions. Contrary to most

other competitors solutions, the EVALSP820-XS

helps customers to really exploit the benefits of

working at high microstepping resolution.

The microstepping resolution can be easily set to

one of eight available values through M1, M2 and

M3 inputs: full-step, 1/2, 1/4, 1/8, 1/16, 1/32,

1/128 and 1/256 of step.

It is simply controlled through step and direction

ports and embeds the PWM current control

algorithm with selectable decay mode (fast + slow

or slow) and the adjustable reference voltage

level through an embedded potentiometer.

The STSPIN820 features a full set of protections

making it a bullet proof device for a wide range of

industrial applications.

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