DRV8812PWPR Detailed explanation of pin function specifications and circuit principle instructions（250 ）

The "DRV8812PWPR" is a product from Texas Instruments, a well-known semiconductor company. The model "DRV8812PWPR" is a dual H-bridge motor driver IC that is designed to drive DC motors and stepper motors in various applications.

Packaging Type

Package Type: TSSOP-28 (Thin Shrink Small Outline Package with 28 pins)

Pin Function Specification and Circuit Principles

The DRV8812PWPR has a 28-pin TSSOP package, and each pin has a specific function. Below is the detailed list of pin functions:

Pin Number Pin Name Pin Type Pin Function Description 1 VCP Power This is the charge pump supply for the internal high-side gate drivers. 2 VREF Input Reference voltage for the current sense amplifiers. 3 VM Power Motor supply voltage pin, typically connected to the motor power supply. 4 VSP Input Motor supply voltage sense input. 5 OUT2 Output Output 2, connected to one terminal of the motor. 6 OUT1 Output Output 1, connected to one terminal of the motor. 7 GND Ground Ground pin for the logic and power circuits. 8 DGND Ground Digital ground for the IC logic. 9 C1 capacitor Capacitor for internal filtering and stability. 10 C2 Capacitor Capacitor for internal filtering and stability. 11 SENSE1 Input Current sense input 1, used to monitor motor current. 12 SENSE2 Input Current sense input 2, used to monitor motor current. 13 AIN Input Analog input for motor speed control. 14 BDIR Input Direction control for the motor. 15 BRAKE Input Brake input to stop the motor. 16 PHASE Input Phase input to set motor driving mode. 17 nSLEEP Input Sleep control pin to enable or disable the IC. 18 nFAULT Output Fault indicator pin, which signals any error or abnormal condition. 19 VDS Output Voltage sensing output for internal over-voltage protection. 20 VDD Power Supply voltage for logic circuits. 21 VCP Power Charge pump for high-side gate drivers. 22 IN1 Input Motor driver control input 1. 23 IN2 Input Motor driver control input 2. 24 GND Ground Ground pin for the logic circuits. 25 REF Input External reference for motor current sense. 26 ISENSE Input Motor current sense input for current regulation. 27 DRV Output Motor driver output pin. 28 NC No Connection Not connected internally.

Circuit Principle

The DRV8812PWPR is a dual H-Bridge motor driver designed to control the direction and speed of motors. The H-Bridge circuit enables the reversal of motor direction by controlling the polarity of the voltage applied to the motor. The IC integrates a current sense feature that monitors the motor's current for protection against overcurrent or stall conditions. The charge pump circuit ensures proper high-side MOSFET operation, allowing efficient motor control with minimal power loss.

Pin Function FAQs

Here are 20 frequently asked questions (FAQs) regarding the DRV8812PWPR's pin functions, in Q&A format:

Q: What is the function of pin 1 (VCP) in the DRV8812PWPR? A: Pin 1 (VCP) is the charge pump supply for the internal high-side gate drivers, providing the required voltage for the high-side MOSFETs .

Q: How does pin 2 (VREF) affect motor performance? A: Pin 2 (VREF) is used to set the reference voltage for the current sense amplifiers, which helps in regulating the motor current and avoiding overcurrent conditions.

Q: Can I use pin 3 (VM) to supply power directly to the motor? A: Yes, pin 3 (VM) is the motor supply voltage pin and should be connected to the motor power supply.

Q: What is the role of pin 7 (GND)? A: Pin 7 (GND) is the ground pin for the logic and power circuits, providing a common reference for the IC.

Q: How should pin 8 (DGND) be connected? A: Pin 8 (DGND) should be connected to the digital ground of the circuit, which is the reference for the IC's logic circuits.

Q: What is the purpose of pins 9 and 10 (C1 and C2)? A: Pins 9 (C1) and 10 (C2) are for external capacitors used to filter and stabilize the internal power supplies, improving the overall performance of the motor driver.

Q: How can I monitor the motor current using pins 11 (SENSE1) and 12 (SENSE2)? A: Pins 11 (SENSE1) and 12 (SENSE2) are the current sense inputs that allow you to monitor the motor current, helping in current regulation and protection against overcurrent conditions.

Q: What is the function of pin 13 (AIN)? A: Pin 13 (AIN) is an analog input used to control the motor's speed by adjusting the input voltage.

Q: What does pin 14 (BDIR) control? A: Pin 14 (BDIR) controls the direction of the motor. By changing the logic level on this pin, the direction of the motor can be reversed.

Q: How can I stop the motor using the DRV8812PWPR? A: Pin 15 (BRAKE) is used to stop the motor immediately when activated.

Q: What is the role of pin 16 (PHASE)? A: Pin 16 (PHASE) sets the motor driving mode, helping control the waveform applied to the motor.

Q: What does pin 17 (nSLEEP) do? A: Pin 17 (nSLEEP) is the sleep control pin, allowing the IC to enter a low-power sleep mode when not in operation.

Q: How do I monitor error conditions in the DRV8812PWPR? A: Pin 18 (nFAULT) signals any fault or abnormal condition in the motor driver, such as overcurrent or thermal shutdown.

Q: What is the purpose of pin 19 (VDS)? A: Pin 19 (VDS) provides the voltage sensing output for the internal over-voltage protection.

Q: Can I use pin 20 (VDD) to supply power to the logic circuits? A: Yes, pin 20 (VDD) provides the supply voltage for the logic circuits inside the IC.

Q: What is pin 21 (VCP) used for? A: Pin 21 (VCP) is a duplicate of pin 1, providing the charge pump supply for the high-side gate drivers.

Q: What function does pin 22 (IN1) serve? A: Pin 22 (IN1) is used to control the motor driver, providing input signals to regulate motor behavior.

Q: What is the purpose of pin 23 (IN2)? A: Pin 23 (IN2) is another input pin used to control the motor's driving state, typically in conjunction with pin 22 (IN1).

Q: What is the function of pin 25 (REF)? A: Pin 25 (REF) is used as an external reference for the motor current sense circuitry.

Q: How does pin 28 (NC) affect the functionality of the IC? A: Pin 28 (NC) is not connected internally and does not affect the operation of the IC. It is used for packaging purposes only.

This detailed breakdown of the DRV8812PWPR should cover your requests. Would you like further information or clarification on any specific details?