原标题：TI DRV8885 1.5A微步距步进马达驱动方案

　　TI公司的DRV8885是集成了电流检测的具有1/16微步距的1.5A步进马达驱动器,包括两个N沟MOSFET H桥驱动器,微步距分度器和电流检测,满刻度电流精度±6.25%,工作电压8.0V-37V,主要用在多功能打印机和扫描仪,激光打印机,3D打印机,ATM,视频安全照相机,办公自动化设备,工厂自动化和机器人.本文介绍了DRV8885主要特性,功能框图,应用框图,以及评估板DRV8885 EVM框图,电路图,材料清单和PCB设计图.

　　The DRV8885 is a stepper motor driver for industrial equipment applications. The device has two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sense. The DRV8885 is capable of driving up to 1.5 A full scale or 1.0 Arms output current (depending on proper PCB ground plane for thermal dissipation and at 24 V and TA = 25℃).

　　The DRV8885 integrated current sense functionality eliminates the need for two external sense resistors.

　　The STEP/DIR pins provide a simple control interface. The device can be configured in full-step up to 1/16 step modes. A low-power sleep mode is provided for very-low quiescent current standby using a dedicated nSLEEP pin.

　　Internal protection functions are provided for undervoltage, charge pump faults, overcurrent, short circuits, and overtemperature. Fault conditions are indicated by an nFAULT pin.

　　DRV8885主要特性:

　　PWM Microstepping Stepper Motor Driver

　　Up to 1/16 Microstepping

　　Non-Circular and Standard ½ Step Modes

　　Integrated Current Sense Functionality

　　No Sense Resistors Required

　　±6.25% Full-Scale Current Accuracy

　　Slow and Mixed Decay Options

　　8.0- to 37-V Operating Supply Voltage Range

　　Low RDS(ON): 0.86 Ω HS + LS at 24 V, 25℃

　　High Current Capacity

　　1.5-A Full Scale per Bridge

　　1.0-Arms per Bridge

　　Fixed Off-Time PWM Chopping

　　Simple STEP/DIR Interface

　　Low-Current Sleep Mode (20 µA)

　　Small Package and Footprint

　　24 HTSSOP (PowerPAD)

　　Protection Features

　　VM Undervoltage Lockout (UVLO)

　　Charge Pump Undervoltage (CPUV)

　　Overcurrent Protection (OCP)

　　Thermal Shutdown (TSD)

　　Fault Condition Indication Pin (nFAULT)

　　DRV8885应用:

　　Multi-Function Printers and Scanners

　　Laser Beam Printers

　　3D Printers

　　Automatic Teller and Money Handling Machines

　　Video Security Cameras

　　Office Automation Machines

　　Factory Automation and Robotics

　　图1.DRV8885功能框图

　　图2.DRV8885 PWM马达驱动器框图

　　图3.DRV8885应用框图

　　评估板DRV8885EVM

　　The DRV8885 customer EVM is a platform revolving around the DRV8885, a medium voltage dual Hbridgedriver and highly configurable power stage. This device has been optimized to drive a single bipolarstepper with up to 16 degrees of internally generated microstepping.

　　The EVM houses an MSP430 microcontroller and an USB interface chip. The USB chip allows for serialcommunications from a PC computer where a Windows® application is used to schedule serialcommands. These commands can be used to control each of the device’s signals, and drive the steppermotor by issuing the step commands at the desired rate.

　　The microcontroller firmware operates using internal index mode.

　　图4.评估板DRV8885 EVM外形图

　　图5.评估板DRV8885 EVM框图