DRV8871DDAR Detailed explanation of pin function specifications and circuit principle instructions
The DRV8871DDAR is a product from Texas Instruments. It is a H-Bridge Motor Driver IC used to drive DC motors, stepper motors, or other inductive loads, and it offers integrated features for controlling motor speed and direction.
Packaging and Pin Functions
The DRV8871DDAR comes in a HTSSOP-20 package (20 pins). Below is a detailed description of each pin function:
Pin Number Pin Name Function Description 1 V5 5V logic supply input. Power s the internal logic circuitry. 2 GND Ground pin for the device. 3 IN1 Motor input 1. This pin controls the direction of the motor. It must be set high or low for the motor to run in the desired direction. 4 IN2 Motor input 2. Works in conjunction with IN1 to control the motor’s direction. 5 PHASE Phase control pin for motor. Determines the rotation direction of the motor. 6 ENABLE Enables or disables the motor driver. When low, the driver is disabled, and no output is applied to the motor. 7 VDS Sense pin for detecting voltage across the MOSFETs in the H-bridge. It helps in detecting overcurrent conditions. 8 ISEN Current sensing input pin for monitoring motor current. 9 VREF Reference voltage input for current limit and torque control. 10 FAULT Open-drain output pin that signals an overcurrent, overtemperature, or undervoltage condition. 11 AOUT Output voltage of the motor driver. This pin provides the motor supply voltage. 12 BOUT Another output voltage pin for motor control. 13 GND Ground for the motor driver circuit. 14 VDS Sensing pin for voltage across the motor driver MOSFET. 15 FAULT Open-drain fault output pin. Signals a fault condition. 16 ENBL Enable pin that activates the motor driver circuit. 17 OUT1 Motor output pin 1. Provides voltage for the motor. 18 OUT2 Motor output pin 2. Works in conjunction with OUT1 to drive the motor. 19 VDD Motor supply voltage input. This pin is used to power the motor. 20 VSS Ground pin for the motor power circuitry.20 FAQ for DRV8871DDAR
What is the voltage range for DRV8871DDAR? The DRV8871DDAR operates within a voltage range of 6.5V to 40V for motor supply (VDD pin) and 3V to 5.5V for logic supply (V5 pin). How do I control the direction of the motor using the DRV8871DDAR? The motor direction is controlled by setting the IN1 and IN2 pins. By changing the logic level on these inputs, you can control the motor's forward or reverse rotation. What is the current sensing feature used for in DRV8871DDAR? The ISEN pin provides current sensing capability to monitor the motor’s current. This helps in managing motor torque, current limiting, and overcurrent protection. How does the DRV8871DDAR protect against overcurrent? The DRV8871DDAR includes overcurrent protection through its VDS and ISEN pins, which help detect excessive current and shut down the driver if necessary. What happens when the FAULT pin is triggered? The FAULT pin goes low when a fault condition is detected, such as overcurrent, overtemperature, or undervoltage, and it can be used to signal an error condition in the system. Can the motor driver be disabled? Yes, the ENABLE pin can be set low to disable the driver and stop motor operation. This pin acts as a shutdown for the driver. What type of load can DRV8871DDAR drive? The DRV8871DDAR can drive DC motors, stepper motors, or other inductive loads within its voltage and current rating. What is the purpose of the VREF pin? The VREF pin is used for setting the current limit, which helps in controlling the torque of the motor. This pin is critical in fine-tuning motor performance. How do I interface DRV8871DDAR with a microcontroller? You can interface DRV8871DDAR with a microcontroller by sending logic signals to the IN1, IN2, and ENABLE pins. A PWM signal can be used for controlling motor speed via these inputs.What is the significance of the PHASE pin?
The PHASE pin determines the direction of the motor rotation. By changing the phase, you can reverse the direction of the motor.What should I do if the FAULT pin is triggered?
If the FAULT pin is triggered, check the system for potential faults such as overcurrent or overtemperature. Once the issue is resolved, reset the FAULT condition.How is the DRV8871DDAR powered?
The DRV8871DDAR is powered via two main pins: VDD (motor supply) and V5 (logic supply). Ensure both are within the required voltage range for proper operation.What is the thermal shutdown feature?
The DRV8871DDAR includes thermal shutdown to prevent damage to the chip in case of excessive temperature rise. If the junction temperature exceeds the safe threshold, the chip will shut down until it cools down.How do I handle inductive loads with DRV8871DDAR?
When handling inductive loads, ensure proper flyback diodes are used to protect the IC from voltage spikes that can occur when the inductive load is de-energized.Can I use the DRV8871DDAR for bidirectional motor control?
Yes, the DRV8871DDAR is capable of bidirectional motor control by manipulating the IN1 and IN2 pins to control the direction of the motor.What is the current limit feature used for?
The current limit feature allows the user to set a maximum current for the motor. This helps in protecting the system from excessive current that could damage components.How do I enable the motor driver?
The motor driver is enabled by setting the ENABLE pin high. This allows the motor to receive power and operate.What happens if the VDS pin is shorted?
If the VDS pin is shorted, it can trigger fault detection for overcurrent or thermal shutdown, leading to the driver being disabled.How can I improve the efficiency of my motor setup with DRV8871DDAR?
To improve efficiency, use appropriate motor voltage, current settings, and cooling for the driver. You can also use PWM for speed control to minimize power loss.Can I use the DRV8871DDAR with a stepper motor?
Yes, the DRV8871DDAR can be used with stepper motors, but you need to handle stepper motor control logic externally using proper stepper drive signals.This detailed guide gives you an in-depth look into the DRV8871DDAR and its capabilities.