DRV8872DDAR Detailed explanation of pin function specifications and circuit principle instructions

The "DRV8872DDAR" you mentioned is a product from Texas Instruments (TI). This is a motor driver integrated circuit (IC), specifically designed to drive DC motors and stepper motors. The part you specified belongs to the DRV8872 family, which is a low-cost, low-voltage H-bridge motor driver capable of controlling the direction and speed of the motor.

Package Type and Pin Count:

The DRV8872DDAR comes in a HTSSOP-20 package, which has 20 pins. The HTSSOP (Heat Sink Thin Shrink Outline Package) is a surface-mount package known for its thermal efficiency and small footprint.

Pin Functions and Description:

Below is a detailed description of the 20 pins of the DRV8872DDAR motor driver in a tabular format:

Pin Number Pin Name Pin Function Description 1 VCP Charge Pump Output: Provides a voltage higher than the motor supply voltage to drive the high-side MOSFETs . 2 VP Motor Power Supply Input: This pin is used for the motor supply voltage (typically from 2.5V to 10.8V). 3 GND Ground: Common ground for the IC and motor power supply. 4 OUT1 Output 1: Connected to one terminal of the motor. This pin provides the motor drive signal. 5 OUT2 Output 2: Connected to the other terminal of the motor. It provides the second motor drive signal. 6 IN1 Input 1: Digital input that controls the state of Output 1 and Output 2 (direction control). The logic level applied to this pin determines the motor direction. 7 IN2 Input 2: Digital input that works with IN1 to control the motor's direction (high/low level inputs control H-bridge). 8 nSLEEP Sleep Input (Active Low): This pin allows the device to be put in a low-power sleep mode when pulled low. 9 nFAULT Fault Output (Active Low): This pin indicates a fault condition. It will be pulled low when an error occurs, such as overcurrent, thermal shutdown, or undervoltage. 10 VDD Logic Supply: Supplies the voltage for the logic circuitry (typically 3.3V or 5V depending on system). 11 VM Motor Supply: Provides the motor power input to the IC (usually between 2.5V to 10.8V). 12 VCP Charge Pump capacitor : This is connected to an external capacitor to maintain voltage levels for the high-side MOSFETs. 13 OUT1 Output 1 (Motor Side): Drives one side of the motor coil. 14 OUT2 Output 2 (Motor Side): Drives the other side of the motor coil. 15 IN1 Input 1: Digital input used for controlling the motor's operation mode, determining the current direction. 16 IN2 Input 2: Another digital input that works in tandem with IN1 to control the motor's operation. 17 nFAULT Fault Indicator: This pin is used to signal when there is a fault in the system, such as overcurrent, undervoltage, or thermal shutdown. 18 nSLEEP Sleep Pin (Active Low): This pin can be used to put the device in sleep mode (low-power mode) by pulling it low. 19 VDD Logic Voltage Supply Pin: Supplies voltage to the logic circuits of the device (typically 3.3V or 5V). 20 GND Ground Pin: This is the ground connection for the IC and motor system, ensuring proper reference voltage for all signals.

Pin Summary:

Power Supply Pins: VP (Motor Power), VDD (Logic Voltage), VM (Motor Supply), VCP (Charge Pump Output) Ground Pins: GND (Ground for Logic), GND (Ground for Motor Power) Motor Control Pins: OUT1, OUT2 (Motor outputs) Control Input Pins: IN1, IN2 (Direction control) Status Pins: nFAULT (Fault output), nSLEEP (Sleep input)

FAQ (Frequently Asked Questions):

Q1: What is the main function of the DRV8872DDAR motor driver? A1: The DRV8872DDAR motor driver is used to drive DC motors, stepper motors, and other types of electric motors, controlling their direction and speed.

Q2: What voltage range can be applied to the motor supply (VM)? A2: The motor supply voltage (VM) can range from 2.5V to 10.8V for the DRV8872DDAR.

Q3: Can the DRV8872DDAR be used with a 12V motor? A3: No, the maximum motor voltage supported is 10.8V, so it is not suitable for motors requiring a higher voltage.

Q4: What happens if there is an overcurrent or thermal shutdown? A4: In case of overcurrent or thermal shutdown, the nFAULT pin will be pulled low, signaling a fault condition.

Q5: How do I put the DRV8872DDAR into sleep mode? A5: To enter sleep mode, pull the nSLEEP pin low.

Q6: What is the charge pump output used for? A6: The VCP pin is used to drive the high-side MOSFETs by providing a voltage higher than the motor supply voltage.

Q7: What is the maximum current the DRV8872DDAR can drive through the motor outputs? A7: The DRV8872DDAR can handle a continuous current of up to 2.5A (depending on thermal conditions).

Q8: How do I control the direction of the motor? A8: The direction of the motor is controlled by applying logic levels to the IN1 and IN2 pins. High/low combinations of these inputs define the direction.

Q9: How can I tell if the motor driver has failed? A9: If a fault occurs, the nFAULT pin will be pulled low, indicating a fault condition such as overcurrent or thermal shutdown.

Q10: Is the DRV8872DDAR compatible with 5V logic systems? A10: Yes, the DRV8872DDAR is compatible with 3.3V or 5V logic systems.

Q11: What is the typical application of the DRV8872DDAR? A11: The DRV8872DDAR is typically used in battery-powered motor applications, robotics, and small appliance control systems.

Q12: How do I connect the motor to the DRV8872DDAR? A12: Connect the two terminals of the motor to the OUT1 and OUT2 pins, ensuring proper polarity.

Q13: What is the purpose of the nFAULT pin? A13: The nFAULT pin is used to signal any error or fault condition such as overcurrent, thermal shutdown, or undervoltage.

Q14: Can I use the DRV8872DDAR to drive a stepper motor? A14: Yes, the DRV8872DDAR is capable of driving stepper motors as well as DC motors.

Q15: Can the DRV8872DDAR be used for high-voltage motor applications? A15: No, the DRV8872DDAR is designed for low-voltage motor applications, up to 10.8V.

Q16: What type of feedback is used to monitor motor operation? A16: The DRV8872DDAR does not provide direct feedback for motor position or speed. Monitoring must be done via external sensors.

Q17: How do I protect the motor driver from overvoltage? A17: Use external components such as voltage clamping diodes or fuses to protect the DRV8872DDAR from overvoltage conditions.

Q18: What is the power dissipation in the DRV8872DDAR? A18: Power dissipation depends on the motor current and the efficiency of the device. Use appropriate thermal management techniques, such as heatsinks, for higher currents.

Q19: How do I reset the DRV8872DDAR after a fault condition? A19: To reset after a fault, ensure the fault condition is cleared and then return the nSLEEP pin high to wake the device from sleep mode.

Q20: Can I drive multiple motors with a single DRV8872DDAR? A20: No, the DRV8872DDAR is designed to control a single motor. For multiple motors, multiple drivers would be required.

Let me know if you need more details or clarification!