DRV8845中文资料德州仪器数据手册PDF规格书

1 Features

• Dual stepper motor driver

– STEP/DIR interface

– Up to 1/256 microstepping indexer

• 4.5 to 38-V Operating supply voltage range

• 900 mΩ HS + LS RDS(ON) at 24 V, 25°C

• 1.5 A full-scale, 1.1 A rms current per H-bridge

• Integrated current sense functionality

– No sense resistors required

– ±5 full-scale current accuracy

• Smart tune decay technology

• Configurable off-time PWM chopping in Smart tune

– 8-μs, 16-μs, or 32-μs

• Supports 1.8-V, 3.3-V, 5.0-V logic inputs

• Low-current sleep mode (1.3 μA)

• Protection features for each Stepper

– VM undervoltage lockout (UVLO)

– Charge pump undervoltage (CPUV)

– Overcurrent protection (OCP)

– Thermal shutdown (OTSD)

– Fault condition output (nFAULT)

2 Applications

• IP Network Camera

• Printers and scanners

• ATM and money handling machines

• Sewing machines

• Medical Imaging, Diagnostics and Equipment

• 3D Printer

3 Description

The DRV8849 is a dual stepper motor driver for

industrial and consumer applications. The device is

fully integrated with four N-channel power MOSFET

H-bridge drivers, one microstepping indexer for

each stepper, and integrated current sensing. The

DRV8849 is capable of driving up to 1.5-A full-scale

output current (dependent on PCB design).

The DRV8849 uses an internal current sense

architecture to eliminate the need for four external

power sense resistors, saving PCB area and system

cost. The device uses an internal PWM current

regulation scheme with smart tune decay mode.

Smart tune automatically adjusts for desired current

regulation, compensates for motor variation and aging

effects and reduces audible noise and vibration from

the motor.

Simple STEP/DIR interfaces allow an external

controller to manage the direction and step rate of

the stepper motors. The device can be configured

in full-step to 1/256 microstepping. A low-power

sleep mode is provided using a dedicated nSLEEP

pin. Protection features are provided for supply

undervoltage, charge pump faults, overcurrent, short

circuits, and overtemperature. Fault conditions are

indicated by one nFAULT pin for each stepper.