Overview
The DRV8805PWPR, produced by Texas Instruments, is a highly integrated unipolar stepper motor driver IC. This device is designed to provide a comprehensive solution for driving unipolar stepper motors with a simple step and direction interface. It includes four low-side drivers with overcurrent protection and integrated inductive clamp diodes, making it suitable for a variety of applications requiring precise motor control.
The DRV8805PWPR supports three stepping modes: 2-phase full-step, 1-2 phase half-step, and 1-phase wave drive. It features internal shutdown functions for overcurrent, short-circuit, undervoltage lockout, and overtemperature protection, with fault indications provided by a dedicated fault output pin.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Operating Supply Voltage Range | 8.2 V to 60 V | V | |
| Maximum Drive Current per Channel (Single Channel On, DW Package) | 1.5 A | A | At 25°C |
| Maximum Drive Current per Channel (Four Channels On, DW Package) | 800 mA | A | At 25°C |
| Maximum Drive Current per Channel (Single Channel On, PWP Package) | 2 A | A | At 25°C with proper PCB heatsinking |
| Maximum Drive Current per Channel (Four Channels On, PWP Package) | 1 A | A | At 25°C with proper PCB heatsinking |
| Overcurrent Protection Trip Level | 2.3 A to 3.8 A | A | |
| Thermal Shutdown Temperature | Safe limits (automatic shutdown and restart) | °C | |
| Package Types | SOIC (20-pin), HTSSOP (16-pin) | Eco-friendly: RoHS & no Sb/Br |
Key Features
- Four protected low-side drivers with overcurrent protection and integrated inductive clamp diodes.
- Simple step and direction interface for controlling unipolar stepper motors.
- Supports three stepping modes: 2-phase full-step, 1-2 phase half-step, and 1-phase wave drive.
- Internal shutdown functions for overcurrent, short-circuit, undervoltage lockout, and overtemperature protection.
- Fault indication via a dedicated fault output pin (nFAULT).
- Thermally enhanced surface mount packages (SOIC and HTSSOP).
- Enable input (nENBL) and reset input (RESET) with internal pulldowns.
- Home position indication via the nHOME pin.
Applications
- Gaming machines.
- General unipolar stepper motor drivers.
- Any application requiring precise control of unipolar stepper motors.
Q & A
- What is the operating supply voltage range of the DRV8805PWPR?
The operating supply voltage range is from 8.2 V to 60 V.
- What are the maximum drive currents per channel for the DW and PWP packages?
For the DW package, the maximum drive current is 1.5 A (single channel on) and 800 mA (four channels on) at 25°C. For the PWP package, it is 2 A (single channel on) and 1 A (four channels on) at 25°C with proper PCB heatsinking.
- What types of stepping modes does the DRV8805PWPR support?
The DRV8805PWPR supports 2-phase full-step, 1-2 phase half-step, and 1-phase wave drive stepping modes.
- How does the overcurrent protection work in the DRV8805PWPR?
The overcurrent protection is implemented through an analog current limit circuit on each FET, which limits the current and disables the driver if the limit is exceeded for more than the deglitch time.
- What is the purpose of the nFAULT pin?
The nFAULT pin indicates a fault condition such as overcurrent, short-circuit, undervoltage lockout, or overtemperature.
- How does the thermal shutdown protection work?
If the die temperature exceeds safe limits, all output FETs are disabled, and the nFAULT pin is driven low. Operation resumes once the die temperature falls to a safe level.
- What are the package options for the DRV8805PWPR?
The DRV8805PWPR is available in 20-pin SOIC and 16-pin HTSSOP packages, both of which are eco-friendly (RoHS & no Sb/Br).
- How do the nENBL and RESET pins function?
The nENBL pin enables or disables the output drivers (active low), and the RESET pin resets the internal logic when driven active high.
- What is the purpose of the VCLAMP pin?
The VCLAMP pin is used to connect the output clamp voltage, which can be connected to the main power supply voltage or a Zener/TVS diode to VM for faster current decay.
- What are some typical applications of the DRV8805PWPR?
Typical applications include gaming machines and general unipolar stepper motor drivers.
