Texas Instruments DRV8885RHRT

Overview

DRV8885RHRT from Texas Instruments is a PWM microstepping stepper motor driver IC with integrated current sense, dual N-channel H-bridge outputs, and 1/16 microstepping capability. It operates from 8 V to 37 V, delivers up to 1.5-A full-scale or 1.0-A RMS output current per bridge, and uses a STEP/DIR interface for motion control in precision industrial motion systems.

For engineers reviewing the DRV8885RHRT datasheet, DRV8885RHRT pinout, DRV8885RHRT application, or DRV8885RHRT equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world application implementation details for stepper motor control in printers, 3D printers, and factory automation.

Technical Context

The DRV8885RHRT integrates two independent N-channel H-bridge drivers, a microstepping indexer supporting full-step through 1/16-step modes (including non-circular 1/2-step), and adaptive blanking-time PWM current regulation. Its fixed off-time chopping uses RREF-based current setting with ±6.25% full-scale accuracy and supports slow/mixed decay selection via the DECAY pin.

Internal 3.3-V and 5.0-V LDOs power logic and analog circuitry; protection includes VM undervoltage lockout (7.8 V trip), charge pump UVLO, overcurrent detection (2.3-A peak), and thermal shutdown (150°C). The device implements tri-level M0/M1 inputs and quad-level DECAY input for flexible mode configuration without external logic.

Key Specifications

Pinout & Package

The DRV8885RHRT is packaged in a 28-pin WQFN (RHR) with 5.5 mm × 3.5 mm body and exposed thermal pad, optimized for high-power density and thermal dissipation in compact motor drive modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stepper motor driver applications.

Compared with TB6600HG and LV8729V, the DRV8885RHRT uniquely combines integrated current sense, STEP/DIR simplicity, non-circular stepping, and torque-scaling capability in a thermally optimized WQFN package-making it optimal for cost-sensitive, space-constrained industrial motion designs requiring minimal MCU overhead.

Availability

DRV8885RHRT is available at Aetrix Electronics and suitable for multi-function printers, 3D printers, and factory automation systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp-up.

Supply support for DRV8885RHRT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with decades of motor control IP investment.

The DRV8885RHRT belongs to TI's high-integration stepper driver product line, designed specifically for industrial equipment applications demanding compact size, thermal robustness, and simplified system-level motion control without external current sensing or complex microcontroller firmware.

FAQ

What is the maximum microstepping resolution supported by the DRV8885RHRT?

The DRV8885RHRT supports up to 1/16 microstepping, configurable via the M0 and M1 tri-level pins. This enables 256 microsteps per full mechanical step, significantly reducing vibration and audible noise compared to full- or half-step operation. The device also offers a non-circular 1/2-step mode for enhanced torque at higher speeds, which is particularly useful in printer carriage and scanner applications. All microstepping modes are executed entirely within the IC's hardware indexer-no processor intervention is required beyond issuing STEP pulses.

Does the DRV8885RHRT require external current sense resistors?

No, the DRV8885RHRT does not require external current sense resistors. It features fully integrated current sense functionality with ±6.25% full-scale accuracy, eliminating the need for high-power shunt resistors and associated PCB area, heat dissipation, and signal conditioning circuitry. Current regulation is set via an external resistor connected to the RREF pin, and real-time torque scaling is enabled via the TRQ pin-both features reduce system complexity and improve reliability compared to discrete-sense solutions.

What protection features are built into the DRV8885RHRT?

The DRV8885RHRT includes comprehensive protection: VM undervoltage lockout (7.8 V trip), charge pump undervoltage detection, overcurrent protection (2.3-A peak per FET), thermal shutdown (150°C junction), and fault condition reporting via the open-drain nFAULT pin. These features operate autonomously without MCU involvement, ensuring safe shutdown during supply faults, motor stalls, or overheating. The nFAULT pin simplifies system-level diagnostics by consolidating all fault states into a single active-low signal requiring only an external pullup resistor.

How does the DRV8885RHRT manage thermal performance in compact layouts?

The DRV8885RHRT uses a 28-pin WQFN (RHR) package with an exposed thermal pad, achieving a junction-to-board thermal resistance (R_θJB) of 12.7°C/W. When mounted on a 4-layer PCB with ≥1 in² copper pour connected to the thermal pad, it sustains 1.0-A RMS output current at 25°C ambient without forced airflow. Its low 0.86-Ω total R_DS(ON) minimizes conduction loss, and adaptive blanking time reduces switching distortion-related heating at low currents-key advantages over alternatives requiring heatsinks or larger footprints.

Can the DRV8885RHRT operate with a 5-V logic supply?

Yes, the DRV8885RHRT accepts 0–5.3-V logic-level inputs on STEP, DIR, ENABLE, nSLEEP, M0, M1, DECAY, and TRQ pins-fully compatible with standard 5-V or 3.3-V microcontrollers. Its DVDD and AVDD internal regulators generate 3.3 V and 5.0 V respectively from VM, so no external logic supply is needed. The nFAULT pin is open-drain and may be pulled up to either DVDD or an external 5-V rail, simplifying interface design across mixed-voltage systems without level shifters.