●The DRV8846 provides a highly-integrated stepper motor driver for cameras, printers, projectors, and other automated equipment applications. The device has two H-bridges and a microstepping indexer and is intended to drive a bipolar stepper motor. The output block of each H-bridge driver consists of N-channel and P-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8846 is capable of driving up to 1-A full scale output current (with proper heatsinking and TA = 25°C).
●A simple STEP/DIR interface allows easy interfacing to controller circuits. Pins allow configuration of the motor in full-step up to 1/32-step modes. Decay mode is configurable so that adaptive decay, slow decay, fast decay, and mixed decay can be used. The PWM current chopping off-time can also be selected. A low-power sleep mode is provided which shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set using a dedicated nSLEEP pin.
●Internal protection functions are provided for UVLO, overcurrent protection, short circuit protection, and overtemperature. Fault conditions are indicated via a nFAULT pin.
● PWM Microstepping Motor Driver
● Built-In Microstepping Indexer
● Up to 1/32 Microstepping
● Step/Direction Control
● Multiple Decay Modes
● Adaptive Decay
● Mixed Decay
● Slow Decay
● Fast Decay
● Configurable Off-Time PWM Chopping
● 10-, 20-, or 30-μs Off-Time
● Adaptive Blanking Time for Smooth Stepping
● 4- to 18-V Operating Supply Voltage Range
● 1-A Continuous/RMS Output Current per H-Bridge
●(at 25°C)
● Low-Current Sleep Mode
● 3-Bit Torque DAC to Scale Motor Current
● Thermally Enhanced Surface Mount Package
● Protection Features
● VM Undervoltage Lockout (UVLO)
● Overcurrent Protection (OCP)
● Thermal Shutdown (TSD)
● Fault Condition Indication Pin (nFAULT)
