Overview
The DRV8825, produced by Texas Instruments, is an integrated motor driver solution designed for driving bipolar stepper motors in various automated equipment applications. It features two H-bridge drivers and a built-in microstepping indexer, enabling precise control over the motor. The device is particularly suited for use in printers, scanners, and other office automation machines, as well as in robotics, gaming machines, and factory automation.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Supply Voltage Range | VM | 8.2 V to 45 V |
| Maximum Drive Current | At 24 V and 25°C | 2.5 A peak, 1.75 A RMS |
| Microstepping Capability | Up to 1/32 microsteps | |
| Decay Modes | SLOW, FAST, MIXED | |
| STEP/DIR Interface | Simple STEP/DIR interface | |
| Sleep Mode | Low current sleep mode | |
| Reference Output | Built-in 3.3-V reference output | |
| Protection Features | Overcurrent Protection (OCP), Thermal Shutdown (TSD), VM Undervoltage Lockout (UVLO), Fault Condition Indication Pin (nFAULT) |
Key Features
- PWM Microstepping Stepper Motor Driver
- Built-In Microstepping Indexer
- Up to 1/32 Microstepping
- Multiple Decay Modes: Slow, Fast, Mixed
- Simple STEP/DIR Interface
- Low Current Sleep Mode
- Built-In 3.3-V Reference Output
- Small Package and Footprint
- Protection Features: Overcurrent Protection (OCP), Thermal Shutdown (TSD), VM Undervoltage Lockout (UVLO), Fault Condition Indication Pin (nFAULT)
Applications
- Printers
- Scanners
- Robotics
- Gaming Machines
- Automatic Teller Machines
- Money Handling Machines
- Video Security Cameras
- Office Automation Machines
- Factory Automation
Q & A
- What is the maximum drive current of the DRV8825?
The DRV8825 can drive up to 2.5 A of current from each output (with proper heat sinking, at 24 V and 25°C).
- What are the available microstepping modes for the DRV8825?
The DRV8825 supports microstepping up to 1/32 steps.
- What are the different decay modes available in the DRV8825?
The DRV8825 supports slow decay, fast decay, and mixed decay modes.
- What is the operating supply voltage range for the DRV8825?
The operating supply voltage range is from 8.2 V to 45 V.
- Does the DRV8825 have built-in protection features?
Yes, the DRV8825 includes protection features such as overcurrent protection (OCP), thermal shutdown (TSD), VM undervoltage lockout (UVLO), and a fault condition indication pin (nFAULT).
- How does the sleep mode function in the DRV8825?
The DRV8825 has a low current sleep mode that can be set using a dedicated nSLEEP pin, which shuts down internal circuitry to achieve very low quiescent current draw.
- What is the purpose of the STEP and DIR pins in the DRV8825?
The STEP and DIR pins are used for controlling the motor steps and direction, respectively, through a simple STEP/DIR interface.
- Can the DRV8825 drive multiple motors?
The DRV8825 can drive a single bipolar stepper motor or two DC motors.
- How does the mixed decay mode work in the DRV8825?
Mixed decay mode begins as fast decay but switches to slow decay mode at a fixed period of time (75% of the PWM cycle) if the current through the winding is decreasing.
- What are some common applications of the DRV8825?
The DRV8825 is commonly used in printers, scanners, robotics, gaming machines, automatic teller machines, money handling machines, video security cameras, office automation machines, and factory automation).
