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DRV8889-Q1 Datasheet(PDF) 13 Page - Texas Instruments

Part No. DRV8889-Q1
Description  DRV8889-Q1, DRV8889A-Q1 Automotive Stepper Driver with Integrated Current Sense, 1/256 Micro-Stepping, and Stall Detection
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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DRV8889-Q1 Datasheet(HTML) 13 Page - Texas Instruments

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7 Detailed Description
7.1 Overview
The DRV8889-Q1 and DRV8889A-Q1 devices are integrated motor-driver solutions for bipolar stepper motors.
The device integrates two N-channel power MOSFET H-bridges, integrated current sense and regulation
circuitry, and a microstepping indexer. The device can be powered with a supply voltage from 4.5 to 45 V and is
capable of providing an output current up to 2.4-A peak, 1.5-A full-scale, or 1.1-A root mean square (rms). The
actual full-scale and rms current depends on the ambient temperature, supply voltage, and PCB thermal
capability. Compared to the DRV8889-Q1, the DRV8889A-Q1 features additional settings for the open-load
detection time and slow-decay to drive blanking time. Additionally, the H-bridges are by default enabled after
power-up for the DRV8889-Q1 and disabled for the DRV8889A-Q1.
The device uses an integrated current-sense architecture which eliminates the need for two external power
sense resistors. This architecture removes the power dissipated in the sense resistors by using a current mirror
approach and using the internal power MOSFETs for current sensing. The current regulation set point is adjusted
by the voltage at the VREF pin. These features reduces external component cost, board PCB size, and system
power consumption.
A simple STEP/DIR interface allows for an external controller to manage the direction and step rate of the
stepper motor. The internal indexer can execute high-accuracy microstepping without requiring the external
controller to manage the winding current level. The indexer is capable of full step, half step, and 1/4, 1/8, 1/16,
1/32, 1/64, 1/128 and 1/256 microstepping. In addition to a standard half stepping mode, a noncircular half
stepping mode is available for increased torque output at higher motor RPM.
The current regulation is configurable between several decay modes. The decay mode can be selected as a
slow-mixed, mixed decay, smart tune Ripple Control, or smart tune Dynamic Decay current regulation scheme.
The slow-mixed decay mode uses slow decay on increasing steps and mixed decay on decreasing steps. The
smart tune decay modes automatically adjust for optimal current regulation performance and compensate for
motor variation and aging effects. Smart tune Ripple Control uses a variable off-time, ripple control scheme to
minimize distortion of the motor winding current. Smart tune Dynamic Decay uses a fixed off-time, dynamic
decay percentage scheme to minimize distortion of the motor winding current while also minimizing frequency
content. In smart tune Ripple Control mode, the device can detect a motor overload stall condition or an end-of-
line travel, by detecting back-emf phase shift between rising and falling current quadrants of the motor current.
The device integrates a spread spectrum clocking feature for both the internal digital oscillator and internal
charge pump. This feature combined with output slew rate control minimizes the radiated emissions from the
device.
A torque DAC feature allows the controller to scale the output current without needing to scale the VREF voltage
reference. The torque DAC is accessed using a digital input pin which allows the controller to save system power
by decreasing the motor current consumption when high output torque is not required.
A low-power sleep mode is included which allows the system to save power when not actively driving the motor.
www.ti.com
DRV8889-Q1
SLVSEE9C – APRIL 2020 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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