DRV8889QPWPRQ1

1 Features

• Qualified for Automotive Applications

• AEC-Q100 Qualified With the Following Results:

– Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range

– Device HBM ESD Classification Level 3A

– Device CDM ESD Classification Level C4B

• PWM microstepping stepper motor driver

– Up to 1/256 microstepping

• Integrated current sense functionality

– No sense resistors required

• Smart tune decay technology, Fixed slow, and mixed decay options

• 4.5 to 45-V Operating supply voltage range

• Low RDS(ON): 900 mΩ HS + LS at 13.5 V, 25°C 

• High current capacity per bridge

– 2.5-A peak, 1.5-A full-scale, 1.1-A rms

• Configurable off-time PWM chopping – 7-μs, 16-μs, 24-μs, or 32-μs.

• Simple STEP/DIR interface

• SPI with daisy chain support

• Low-current sleep mode (2 μA)

• Spread spectrum clocking and output slew rate control minimizes EMI

• Small package and footprint

• Protection features

– VM undervoltage lockout (UVLO)

– Charge pump undervoltage (CPUV)

– Overcurrent protection (OCP)

– Stall detection

– Open load detection

– Overtemperature warning (OTW)

– Undertemperature warning (UTW)

– Thermal shutdown (OTSD)

– Fault condition indication pin (nFAULT)

2 Applications

• Automotive bipolar stepper motors

• Headlight position adjustment

• Head-up display (HUD)

• HVAC stepper motors

• Electronic fuel injection (EFI)

3 Description

The DRV8889-Q1 is a stepper motor driver for automotive applications. The device is fully integrated with two N-channel power MOSFET H-bridge drivers, a microstepping indexer, and integrated current sensing. The DRV8889-Q1 is capable of driving up to 1.5-A full scale or 1.1-A rms output current (13.5-V and TA = 25°C, dependent on PCB design).

The DRV8889-Q1 uses an internal current sense architecture to eliminate the need for two external power sense resistors, saving PCB area and system cost. The DRV8889-Q1 uses an internal PWM current regulation scheme selectable between smart tune, slow, and mixed decay options. Smart tune decay technology automatically adjusts for optimal current regulation performance and compensates for motor variation and aging effects. A torque DAC feature allows the controller to scale the output current without needing to scale the VREF voltage reference.

A simple STEP/DIR interface allows an external controller to manage the direction and step rate of the stepper motor. The device can be configured in different step modes ranging from full-step to 1/256 microstepping. A low-power sleep mode is provided for very low standby quiescent standby current using a dedicated nSLEEP pin. The device features full duplex, 4-wire synchronous SPI communication, with daisy chain support for up to 63 devices connected in series, for configurability and detailed fault reporting.

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