ST公司的STSPIN820是高速高分辨率步进马达驱动器,集成了控制逻辑和低RDSon功率级,集成的控制器实现了有固定OFF时间PWM电流控制和高达1/256步的微步距分辨率,并提供了完整的保护特性包括过流,超温和短路保护.工作电压7-45V,最大输出电流1.5Arms,主要用在3D打印机,医疗设备,工业2D打印机,缝纫机,CCTV,安全和球型摄像机,ATM和现钞处理机,办公和家庭自动化设备,POS和机器人.本文介绍了STSPIN820主要特性,框图和STSPIN820主要特性,电路图,以及基于STSPIN820步进马达扩展板X-NUCLEO-IHM14A1主要特性,电路图,材料清单.
The STSPIN820 is a stepper motor driver whichintegrates, in a small QFN 4 x 4 mm package,both control logic and a low RDSon power stage.The integrated controller implements a PWMcurrent control with fixed OFF time and amicrostepping resolution up to 1/256th of the step.
The device can be forced into a low consumptionstate.The device offers a complete set of protectionfeatures including overcurrent, overtemperatureand short-circuit protection.

STSPIN820主要特性:
 Operating voltage from 7 to 45 V
 Maximum output current 1.5 Arms
 RDSon HS + LS = 1 Ω typ.
 Microstepping up to 1/256th of step
 Current control with programmable OFF time
 Current sensing based on external shuntresistor
 Full protection set
 Non-dissipative overcurrent protection
 Short-circuit protection
 Undervoltage lockout
 Thermal shutdown
 Standby low consumption

STSPIN820应用:
 3D printers
 Medical equipment
 Industrial 2D printers
 Textile and sewing machines
 CCTV, security and dome cameras
 ATM and cash handling machines
 Office and home automation
 POS
 Robotics

图1.STSPIN820框图

评估板EVALSP820-XS
Compact evaluation board for STSPIN820 stepper motor driver
The EVALSP820-XS is a compact and easy touse evaluation board for the STSPIN820, theworld ’ s smallest 45 V microstepping motor driverrated at 2.5 A.It provides a very compact solution to evaluatethe performance of the STSPIN820 stepper motordriver with a minimum set of additional equipmentand without the need of additional devices.
The hardware is fully compatible to be usedtogether with RAMPS or other similar FFF 3D
printing platforms, representing a very fast drop-inreplacement of similar solutions. Contrary to mostother competitors solutions, the EVALSP820-XShelps customers to really exploit the benefits ofworking at high microstepping resolution.
The microstepping resolution can be easily set toone of eight available values through M1, M2 andM3 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 directionports and embeds the PWM current controlalgorithm with selectable decay mode (fast + slowor slow) and the adjustable reference voltagelevel through an embedded potentiometer.
The STSPIN820 features a full set of protectionsmaking it a bullet proof device for a wide range ofindustrial applications.

评估板EVALSP820-XS主要特性:
 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
 Integrated low RDS(ON) power stages(HS + LS = 1 Ω typ.)
 Microstep resolution easily settable throughjumpers: 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 apotentiometer to set the ref. voltages
 Embedded PWM current control withselectable decay mode (fast or slow)
 Full set of embedded protections
– Non-dissipative overcurrent
– Undervoltage lockout
– Thermal shutdown
– Short-circuit
 Compatible with RAMPS and similar opensource solutions for FFF 3D printers
 Very compact footprint: 15 x 20 mm

评估板EVALSP820-XS应用:
 3D printers
 Medical equipment
 Textile and sewing machines

图2.评估板EVALSP820-XS外形图

图3.评估板EVALSP820-XS电路图

基于STSPIN820步进马达扩展板X-NUCLEO-IHM14A1
Getting started with the X-NUCLEO-IHM14A1 stepper motor driver expansion board based on STSPIN820 for STM32 Nucleo
The X-NUCLEO-IHM14A1 motor driver expansion board is based on the STSPIN820 monolithic driver for stepper motors. It represents an affordable, easy-to-use solution for driving stepper motors in your STM32 Nucleo project, implementing motor driving applications such as 2D/3D printers, robotics and security cameras. The STSPIN820 implements a PWM current control with constant OFF time adjustable via an external resistor and a microstepping resolution up to the 256th step. The X-NUCLEO-IHM14A1 expansion board is compatible with the Arduino UNO R3 connector and the ST morpho connector, so it can be plugged to the STM32 Nucleo development board and stacked with additional X-NUCLEO expansion boards.
The X-NUCLEO-IHM14A1 expansion board for STM32 Nucleo is a stepper motor driver covering a wide range of applications.

步进马达扩展板X-NUCLEO-IHM14A1主要特性:
 Operating voltage: 7 to 45 V
 Output current up to 1.5 Arms
 Fine tuning microstepping up to the 256th step
 Current control with adjustable OFF time
 Full protection set:
 Overcurrent protection
 Short-circuit protection
 Under voltage lock out
 Thermal shutdown
 Compatible with Arduino UNO R3 connector
 Compatible with STM32 Nucleo boards
 RoHS compliant

图4.步进马达扩展板X-NUCLEO-IHM14A1外形图

图5.步进马达扩展板X-NUCLEO-IHM14A1电路图
步进马达扩展板X-NUCLEO-IHM14A1材料清单:

图6.步进马达扩展板X-NUCLEO-IHM14A1开关和连接器外形图