SLVSE89C August   2017  – June 2020 DRV10987

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Application Schematic
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Regulators
        1. 8.3.1.1 Step-Down Regulator
        2. 8.3.1.2 3.3-V and 1.8-V LDOs
      2. 8.3.2 Protection Circuits
        1. 8.3.2.1 Thermal Shutdown
        2. 8.3.2.2 Undervoltage Lockout (UVLO)
        3. 8.3.2.3 Overcurrent Protection (OCP)
        4. 8.3.2.4 Lock
      3. 8.3.3 Motor Speed Control
      4. 8.3.4 Overvoltage Protection
      5. 8.3.5 Sleep or Standby Condition
        1. 8.3.5.1 Required Sequence to Enter Sleep Mode
          1. 8.3.5.1.1 Option 1
          2. 8.3.5.1.2 Option 2
      6. 8.3.6 EEPROM Access
    4. 8.4 Device Functional Modes
      1. 8.4.1  Motor Parameters
        1. 8.4.1.1 Motor Phase Resistance (RPH_CT)
        2. 8.4.1.2 BEMF Constant (Kt)
      2. 8.4.2  Starting the Motor Under Different Initial Conditions
        1. 8.4.2.1 Case 1 – Motor is Stationary
        2. 8.4.2.2 Case 2 – Motor is Spinning in the Forward Direction
        3. 8.4.2.3 Case 3 – Motor is Spinning in the Reverse Direction
      3. 8.4.3  Motor Start Sequence
        1. 8.4.3.1 Initial Speed Detect (ISD)
        2. 8.4.3.2 Motor Resynchronization
        3. 8.4.3.3 Reverse Drive
        4. 8.4.3.4 Motor Brake
        5. 8.4.3.5 Motor Initialization
          1. 8.4.3.5.1 Align
          2. 8.4.3.5.2 Initial Position Detect (IPD)
            1. 8.4.3.5.2.1 IPD Operation
            2. 8.4.3.5.2.2 IPD Release Mode
            3. 8.4.3.5.2.3 IPD Advance Angle
          3. 8.4.3.5.3 Motor Start
        6. 8.4.3.6 Start-Up Timing
      4. 8.4.4  Align Current
      5. 8.4.5  Start-Up Current Setting
        1. 8.4.5.1 Start-Up Current Ramp-Up
      6. 8.4.6  Closed Loop
        1. 8.4.6.1 Half-Cycle Control and Full-Cycle Control
        2. 8.4.6.2 Analog-Mode Speed Control
        3. 8.4.6.3 Digital PWM-Input-Mode Speed Control
        4. 8.4.6.4 I2C-Mode Speed Control
        5. 8.4.6.5 Closed-Loop Accelerate
        6. 8.4.6.6 Control Coefficient
        7. 8.4.6.7 Commutation Control
      7. 8.4.7  Current Limits
        1. 8.4.7.1 Software Current Limit
      8. 8.4.8  Lock Detect and Fault Handling
        1. 8.4.8.1 Lock0: Lock-Detection Current Limit Triggered
        2. 8.4.8.2 Lock1: Abnormal Speed
        3. 8.4.8.3 Lock2: Abnormal Kt
        4. 8.4.8.4 Lock3: No-Motor Fault
        5. 8.4.8.5 Lock4: Open-Loop Motor-Stuck Lock
        6. 8.4.8.6 Lock5: Closed-Loop Motor-Stuck Lock
      9. 8.4.9  Anti-Voltage Surge Function
        1. 8.4.9.1 Mechanical AVS Function
        2. 8.4.9.2 Inductive AVS Function
      10. 8.4.10 PWM Output
      11. 8.4.11 FG Customized Configuration
        1. 8.4.11.1 FG Configuration
        2. 8.4.11.2 FG Open-Loop and Lock Behavior
      12. 8.4.12 Diagnostics and Visibility
        1. 8.4.12.1 Motor-Status Readback
        2. 8.4.12.2 Motor-Speed Readback
        3. 8.4.12.3 Motor Electrical-Period Readback
        4. 8.4.12.4 BEMF Constant Readback
        5. 8.4.12.5 Motor Estimated Position by IPD
        6. 8.4.12.6 Supply-Voltage Readback
        7. 8.4.12.7 Speed-Command Readback
        8. 8.4.12.8 Speed-Command Buffer Readback
        9. 8.4.12.9 Fault Diagnostics
    5. 8.5 Register Maps
      1. 8.5.1 I2C Serial Interface
      2. 8.5.2 Register Map
      3. 8.5.3 Register Descriptions
        1. 8.5.3.1  FaultReg Register (address = 0x00) [reset = 0x00]
          1. Table 11. FaultReg Register Field Descriptions
        2. 8.5.3.2  MotorSpeed Register (address = 0x01) [reset = 0x00]
          1. Table 12. MotorSpeed Register Field Descriptions
        3. 8.5.3.3  MotorPeriod Register (address = 0x02) [reset = 0x00]
          1. Table 13. MotorPeriod Register Field Descriptions
        4. 8.5.3.4  MotorKt Register (address = 0x03) [reset = 0x00]
          1. Table 14. MotorKt Register Field Descriptions
        5. 8.5.3.5  MotorCurrent Register (address = 0x04) [reset = 0x00]
          1. Table 15. MotorCurrent Register Field Descriptions
        6. 8.5.3.6  IPDPosition–SupplyVoltage Register (address = 0x05) [reset = 0x00]
          1. Table 16. IPDPosition–SupplyVoltage Register Field Descriptions
        7. 8.5.3.7  SpeedCmd–spdCmdBuffer Register (address = 0x06) [reset = 0x00]
          1. Table 17. SpeedCmd–spdCmdBuffer Register Field Descriptions
        8. 8.5.3.8  AnalogInLvl Register (address = 0x07) [reset = 0x00]
          1. Table 18. AnalogInLvl Register Field Descriptions
        9. 8.5.3.9  DeviceID–RevisionID Register (address = 0x08) [reset = 0x00]
          1. Table 19. DeviceID–RevisionID Register Field Descriptions
        10. 8.5.3.10 Unused Registers (addresses = 0x011 Through 0x2F)
        11. 8.5.3.11 SpeedCtrl Register (address = 0x30) [reset = 0x00]
          1. Table 20. SpeedCtrl Register Field Descriptions
        12. 8.5.3.12 EEPROM Programming1 Register (address = 0x31) [reset = 0x00]
          1. Table 21. EEPROM Programming1 Register Field Descriptions
        13. 8.5.3.13 EEPROM Programming2 Register (address = 0x32) [reset = 0x00]
          1. Table 22. EEPROM Programming2 Register Field Descriptions
        14. 8.5.3.14 EEPROM Programming3 Register (address = 0x33) [reset = 0x00]
          1. Table 23. EEPROM Programming3 Register Field Descriptions
        15. 8.5.3.15 EEPROM Programming4 Register (address = 0x34) [reset = 0x00]
          1. Table 24. EEPROM Programming4 Register Field Descriptions
        16. 8.5.3.16 EEPROM Programming5 Register (address = 0x35) [reset = 0x00]
          1. Table 25. EEPROM Programming5 Register Field Descriptions
        17. 8.5.3.17 EEPROM Programming6 Register (address = 0x36) [reset = 0x00]
          1. Table 26. EEPROM Programming6 Register Field Descriptions
        18. 8.5.3.18 Unused Registers (addresses = 0x37 Through 0x5F)
        19. 8.5.3.19 EECTRL Register (address = 0x60) [reset = 0x00]
          1. Table 27. EECTRL Register Field Descriptions
        20. 8.5.3.20 Unused Registers (addresses = 0x61 Through 0x8F)
        21. 8.5.3.21 CONFIG1 Register (address = 0x90) [reset = 0x00]
          1. Table 28. CONFIG1 Register Field Descriptions
        22. 8.5.3.22 CONFIG2 Register (address = 0x91) [reset = 0x00]
          1. Table 29. CONFIG2 Register Field Descriptions
        23. 8.5.3.23 CONFIG3 Register (address = 0x92) [reset = 0x00]
          1. Table 30. CONFIG3 Register Field Descriptions
        24. 8.5.3.24 CONFIG4 Register (address = 0x93) [reset = 0x00]
          1. Table 31. CONFIG4 Register Field Descriptions
        25. 8.5.3.25 CONFIG5 Register (address = 0x94) [reset = 0x00]
          1. Table 32. CONFIG5 Register Field Descriptions
        26. 8.5.3.26 CONFIG6 Register (address = 0x95) [reset = 0x00]
          1. Table 33. CONFIG6 Register Field Descriptions
        27. 8.5.3.27 CONFIG7 Register (address = 0x96) [reset = 0x00]
          1. Table 34. CONFIG7 Register Field Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.1 Overview

The DRV10987 device is a three-phase sensorless motor driver with integrated power MOSFETs that provides drive-current capability up to 2 A continuously. The device is specifically designed for low-noise, low-external-component-count motor-drive applications. The device is configurable through a simple I2C interface to accommodate different motor parameters and spin-up profiles for different customer applications.

A 180° sensorless control scheme provides continuous sinusoidal output voltages to the motor phases to enable ultra-quiet motor operation by keeping the electrically induced torque ripple small.

The DRV10987 device features extensive protection and fault-detection mechanisms to ensure reliable operation. Voltage surge protection prevents the input VCC capacitor from overcharging, which typically occurs during motor deceleration. The device provides overcurrent protection without the need for an external current-sense resistor. Rotor-lock detection is available through several methods. These methods can be configured with register settings to ensure reliable operation. The device provides additional protection for undervoltage lockout (UVLO) and for thermal shutdown.

The commutation control algorithm continuously measures the motor phase current and periodically measures the VCC supply voltage. The device uses this information for BEMF estimation, and the information is also provided through the I2C register interface for debug and diagnostic use in the system, if desired.

A step-down regulator in buck mode efficiently steps down the supply voltage. The output of this regulator provides power for the internal circuits and can also be used to provide power for an external circuit such as a microcontroller. If providing power for an external circuit is not necessary (and to reduce system cost), configure the step-down regulator as a linear regulator by replacing the inductor with a resistor.

The DRV10987 device has a flexible interface, capable of supporting both analog and digital inputs. In addition to the I2C interface, the device has FG, DIR, and SPEED pins. SPEED is the speed–command input pin. DIR is the direction–control input pin. FG is the speed indicator output, which shows the frequency of the motor commutation.

EEPROM is integrated in the DRV10987 device as memory for the motor parameter and operation settings. EEPROM data transfers to the registers after power-on.

The DRV10987 device can also operate in register mode. If the system includes a microcontroller communicating through the I2C interface, the device can dynamically update the motor parameters and operation settings by writing to the registers. In this configuration, the EEPROM data is bypassed by the register settings.