DRV8876PWPR Detailed explanation of pin function specifications and circuit principle instructions

The DRV8876PWPR is a motor driver IC from Texas Instruments, specifically designed for driving DC motors, and it comes in a Power WQFN (Quad Flat No-lead) package. Below is a detailed explanation of the pin function specifications, as well as the complete pinout list with descriptions, including the circuit principle, pin functionalities, and common FAQ questions related to the DRV8876PWPR.

Pinout Overview

The DRV8876PWPR package has a total of 24 pins. Below is a breakdown of each pin and its corresponding function.

Pinout Table (24-Pin PowerWQFN Package)

Pin No. Pin Name Function 1 VCP Charge pump voltage supply for internal circuitry, ensures proper internal voltage levels. 2 VGS Gate supply for MOSFETs , which helps drive the H-bridge power stages. 3 GND Ground pin, provides the reference for all logic and power signals. 4 OUT1 Motor driver output 1, one of the output pins that connects to the motor phase. 5 OUT2 Motor driver output 2, the second output pin for connecting to the motor phase. 6 IN1 Logic input for control of the first MOSFET of the H-bridge. 7 IN2 Logic input for control of the second MOSFET of the H-bridge. 8 VDD Power supply for the logic section of the device. 9 V5 (V5_Supply) Provides internal 5V regulation for the device’s logic and control circuitry. 10 FAULT Open-drain output that signals an error condition such as thermal shutdown, overcurrent, etc. 11 SENSE1 Motor current sensing input for the first H-bridge transistor , used to monitor current. 12 SENSE2 Motor current sensing input for the second H-bridge transistor, used to monitor current. 13 DIAG Diagnostics output pin, used to provide feedback on motor driver status or fault conditions. 14 PWM_CTRL PWM control input, used for controlling the speed of the motor through pulse width modulation (PWM). 15 nSLEEP Sleep mode control pin, used to put the IC into a low-power state when not in use. 16 RESET Reset pin to initialize the IC, reset the internal states, or recover from a fault condition. 17 VCC Motor supply voltage, connects to the positive terminal of the motor power source. 18 COMP comparator input, used to adjust the output of the motor driver based on certain parameters. 19 IN3 Additional logic control input for adjusting the motor’s operation. 20 IN4 Additional logic control input, used in conjunction with other control pins for H-bridge operation. 21 VREG Regulated voltage output, typically used to power external components or sensors. 22 GND Another ground pin for connecting to system ground. 23 V1 (Motor Supply) Provides motor drive voltage for one phase of the motor. 24 V2 (Motor Supply) Provides motor drive voltage for the second phase of the motor.

Detailed Pin Function Descriptions:

VCP (Pin 1): This pin provides charge pump voltage for the internal high-side MOSFET driver. It is essential for supplying the correct voltage to the internal circuitry.

VGS (Pin 2): Gate supply voltage for the MOSFETs, responsible for turning the MOSFETs on and off within the H-bridge.

GND (Pin 3, Pin 22): Ground reference for the entire system, ensuring the IC functions with proper reference voltage.

OUT1 and OUT2 (Pin 4, Pin 5): The output pins of the motor driver, connected to the motor windings. These pins control the current through the motor windings, providing the necessary torque to the motor.

IN1 and IN2 (Pin 6, Pin 7): Logic-level inputs used to control the MOSFETs in the H-bridge for direction control. These pins receive signals from the microcontroller or control logic to turn the motor in a specified direction.

VDD (Pin 8): This pin supplies the voltage needed for the logic section of the IC.

V5 (Pin 9): Internal voltage regulator output, providing 5V to power the internal logic and control circuits.

FAULT (Pin 10): This open-drain output pin indicates error conditions such as thermal shutdown, overcurrent, or undervoltage.

SENSE1 and SENSE2 (Pin 11, Pin 12): These pins sense the current flowing through the motor windings. The feedback allows the IC to monitor and protect the motor from overcurrent conditions.

DIAG (Pin 13): Diagnostic output used for reporting status or fault information. This output can be used for system monitoring.

PWM_CTRL (Pin 14): This pin controls the speed of the motor by modulating the width of the pulse (PWM), allowing for fine control of the motor's speed.

nSLEEP (Pin 15): Used to put the IC into a low-power sleep mode. When this pin is pulled low, the IC enters a low-power state.

RESET (Pin 16): This pin is used to reset the IC, returning it to a known state.

VCC (Pin 17): Power supply pin for the motor. This is where the external motor voltage source is connected.

COMP (Pin 18): This pin is connected to a comparator, allowing for additional motor performance tuning.

IN3 and IN4 (Pin 19, Pin 20): Additional inputs for controlling the motor, typically used in more advanced configurations for full control of the motor direction and speed.

VREG (Pin 21): The output regulated voltage, providing power for external components such as sensors or other ICs.

V1 and V2 (Pin 23, Pin 24): These pins provide voltage to the two motor phases, enabling the motor to rotate.

20 FAQ Related to DRV8876PWPR:

Q: What is the operating voltage range for DRV8876PWPR? A: The DRV8876PWPR operates with a motor supply voltage (VCC) from 4.5V to 38V.

Q: What is the maximum current rating of the DRV8876PWPR? A: The DRV8876PWPR can provide up to 3.6A of continuous output current.

Q: Can the DRV8876PWPR be used with a microcontroller for speed control? A: Yes, you can use PWM_CTRL pin to adjust the motor speed with a microcontroller.

Q: How do I put the DRV8876PWPR in sleep mode? A: To enter sleep mode, pull the nSLEEP pin low.

Q: What does the FAULT pin indicate? A: The FAULT pin is an open-drain output that signals error conditions like thermal shutdown or overcurrent.

Q: What is the significance of the SENSE pins (SENSE1, SENSE2)? A: The SENSE pins are used to monitor the current through the motor windings, providing feedback for protection.

Q: Can I use the DRV8876PWPR in high-precision applications? A: Yes, the IC has internal diagnostics and current sensing features that are useful for high-precision motor control.

Q: What is the purpose of the RESET pin? A: The RESET pin is used to initialize the device and clear any faults or reset the internal states.

Q: How do I control the direction of the motor? A: Use the IN1 and IN2 pins to control the direction of the motor by toggling the logic levels.

Q: How do I control the motor’s speed? A: Speed control is achieved by sending a PWM signal to the PWM_CTRL pin.

Q: Can I use the DRV8876PWPR to drive a stepper motor? A: No, the DRV8876PWPR is designed for DC motor applications, not stepper motors.

Q: What type of protection features does the DRV8876PWPR have? A: It includes overcurrent protection, thermal shutdown, undervoltage lockout, and fault detection.

Q: Can I use the DRV8876PWPR with a 12V motor? A: Yes, the DRV8876PWPR supports 12V motors as long as the voltage is within the specified operating range.

Q: What is the package type of the DRV8876PWPR? A: The DRV8876PWPR comes in a 24-pin PowerWQFN package.

Q: Can I connect the motor directly to the OUT1 and OUT2 pins? A: Yes, the OUT1 and OUT2 pins are the motor drive outputs and are directly connected to the motor windings.

Q: Does the DRV8876PWPR require external components for operation? A: Yes, external components like capacitor s and resistors are recommended for proper functionality.

Q: What happens if I don’t use the FAULT pin? A: If not used, the FAULT pin can be left floating, but it’s recommended to use it to monitor fault conditions.

Q: How do I reset the DRV8876PWPR after a fault? A: To reset, toggle the RESET pin to reset the internal states.

Q: What is the V5 pin used for? A: The V5 pin provides a 5V output to power the internal logic.

Q: Can I use the DRV8876PWPR for bidirectional motor control? A: Yes, using the IN1 and IN2 pins allows bidirectional control of the motor.

This explanation should cover the main features and specifications of the DRV8876PWPR motor driver.