AW8646QNR

The AW8646 is a flexible microstepping stepper motor driver. It is designed to operate bipolar stepper motor with up to 1/32th step mode for mobile phones, tablets, and other automated equipment applications. The device can be controlled by simple STEP/DIR interface allowing easy interfacing to controller circuits. 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. Pins allow configuration of the motor in full-step up to 1/32th step modes. Decay mode is configurable so that adaptive decay, slow decay, fast decay, and mixed decay can be used. A low power sleep mode is provided to achieve very-low quiescent current draw. AW8646 is capable of driving up to 1.4A (Full Scale) or 1A (RMS) current per H-Bridge. The device offers a complete set of protection features including UVLO, overcurrent protection, short circuit protection, and over temperature. Fault conditions are indicated via the nFAULT pin. The AW8646 is a bipolar stepper motors driver integrating 2 H-bridges that use NMOS low-side drivers and PMOS high-side drivers, two PWM current controller, and a microstepping sequencer. The AW8646 can be powered with a supply range between 3 to 12V. The AW8646 is capable of driving up to 1.4A (Full Scale) or 1A (RMS) current per H-Bridge. At each STEP rising edge or falling edge(some step mode), the sequencer of the device increased or decreased as step mode configuration. The internal sequencer is able to execute high-accuracy microstepping setting the reference value of the PWM current controller and the direction of the current for both of the H-bridge. The total PWM off-time, tOFF can be adjusted to 10, 20, or 30μs. The AW8646 has Adaptive Decay Technology that automatically adjusts the decay setting to minimize current ripple. This feature allows the device to quickly be integrated into a system. The torque current can be adjusted using digital input pins. This allows the controller to save power by decreasing the current consumption when not required. A low-power sleep mode is included, which allows the system to save power when not driving the motor.

Applications

• Mobile phones
• Tablets
• Printer
• Video Security Cameras

Key features

• 3V to 12V Supply Voltage Range
• 1.4A Full Scale current per H-Bridge Rdson HS + LS: Typical 0.8Ω
• Support up to 1/32th Microstepping
• Decay Modes supported: Adaptive Decay Technology, Mixed Decay, Slow Decay, Fast Decay
• Support 1.8V Logic Level
• Programmable off-time 10, 20, or 30μs
• Programmable Motor Torque Current
• Short-Circuit Protection, Over-Temperature Protection, Under-Voltage Protection
• Fault Condition Indication
• QFN 4mm X 4mm X 0.85mm - 24L package