The DRV8899-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 DRV8899-Q1 is capable of driving up to 1-A full scale or 0.7-A rms output current (13.5-V and TA = 25°C, dependent on PCB design).
The DRV8899-Q1 uses an internal current sense architecture to eliminate the need for two external power sense resistors, saving PCB area and system cost. The DRV8899-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.