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DRV8849: 38 V, 1.5 A Dual Stepper Driver with Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and Smart Tune
SLVSGF6A
May 2023 – October 2023
DRV8849
PRODUCTION DATA
CONTENTS
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DRV8849: 38 V, 1.5 A Dual Stepper Driver with Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and Smart Tune
1
1
Features
2
Applications
3
Description
4
Revision History
5
Device Comparison
6
Pin Configuration and Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Indexer Timing Requirements
7.7
Typical Operating Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Stepper Motor Driver Current Ratings
8.3.1.1
Peak Current Rating
8.3.1.2
RMS Current Rating
8.3.1.3
Full-Scale Current Rating
8.3.2
Microstepping Indexer
8.3.3
Controlling VREF with an MCU DAC
8.3.4
Current Regulation and Decay Modes
8.3.4.1
Smart tune Ripple Control
8.3.4.2
Smart tune Dynamic Decay
8.3.4.3
Blanking time
8.3.5
Charge Pump
8.3.6
Logic Level, tri-level and quad-level Pin Diagrams
8.3.7
nFAULT Pins
8.3.8
Protection Circuits
8.3.8.1
VM Undervoltage Lockout (UVLO)
8.3.8.2
VCP Undervoltage Lockout (CPUV)
8.3.8.3
Overcurrent Protection (OCP)
8.3.8.3.1
Latched Shutdown
8.3.8.3.2
Automatic Retry
8.3.8.4
Thermal Shutdown (OTSD)
8.3.8.4.1
Latched Shutdown
8.3.8.4.2
Automatic Retry
8.3.8.5
Fault Condition Summary
8.4
Device Functional Modes
8.4.1
Sleep Mode (nSLEEP = 0)
8.4.2
Disable Mode (nSLEEP = 1, ENABLE = 0)
8.4.3
Operating Mode (nSLEEP = 1, ENABLE = Hi-Z/1)
8.4.4
nSLEEP Reset Pulse
8.4.5
Functional Modes Summary
9
Application and Implementation
9.1
Application Information
9.2
Typical Application
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Stepper Motor Speed
9.2.2.2
Current Regulation
9.2.2.3
Decay Modes
9.2.2.4
Application Curves
10
Layout
10.1
Layout Guidelines
10.2
Bulk Capacitance
11
Device and Documentation Support
11.1
Related Documentation
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RHH|36
MPQF144E
Thermal pad, mechanical data (Package|Pins)
Orderable Information
slvsgf6a_oa
slvsgf6a_pm
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Data Sheet
DRV8849: 38 V, 1.5 A Dual Stepper Driver with Integrated Current Sense, 1/256 Microstepping, STEP/DIR Interface and Smart Tune
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 R
DS(ON)
at 24 V, 25°C
1.5 A full-scale, 1.1 A rms current per H-bridge
Integrated current sense functionality
±5% full-scale current accuracy
No sense resistors required
Smart tune decay technology
Configurable off-time PWM chopping in Smart tune
8-μs, 16-μs, or 32-μs
Supports 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)
