SLVSCP2F January   2015  – June 2020 DRV10975

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 LDO
      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 Sleep or Standby Condition
      5. 8.3.5 Non-Volatile Memory
    4. 8.4 Device Functional Modes
      1. 8.4.1  Motor Parameters
        1. 8.4.1.1 Motor Phase Resistance
        2. 8.4.1.2 BEMF Constant
      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 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  Start-Up Current Setting
        1. 8.4.4.1 Start-Up Current Ramp-Up
      5. 8.4.5  Closed Loop
        1. 8.4.5.1 Half Cycle Control and Full Cycle Control
        2. 8.4.5.2 Analog Mode Speed Control
        3. 8.4.5.3 Digital PWM Input Mode Speed Control
        4. 8.4.5.4 I2C Mode Speed Control
        5. 8.4.5.5 Closed Loop Accelerate
        6. 8.4.5.6 Control Coefficient
        7. 8.4.5.7 Commutation Control Advance Angle
      6. 8.4.6  Current Limit
        1. 8.4.6.1 Acceleration Current Limit
      7. 8.4.7  Lock Detect and Fault Handling
        1. 8.4.7.1 Lock0: Lock Detection Current Limit Triggered
        2. 8.4.7.2 Lock1: Abnormal Speed
        3. 8.4.7.3 Lock2: Abnormal Kt
        4. 8.4.7.4 Lock3 (Fault3): No Motor Fault
        5. 8.4.7.5 Lock4: Open Loop Motor Stuck Lock
        6. 8.4.7.6 Lock5: Closed Loop Motor Stuck Lock
      8. 8.4.8  AVS Function
        1. 8.4.8.1 Mechanical AVS Function
      9. 8.4.9  PWM Output
      10. 8.4.10 FG Customized Configuration
        1. 8.4.10.1 FG Output Frequency
        2. 8.4.10.2 FG Open-Loop and Lock Behavior
      11. 8.4.11 Diagnostics and Visibility
        1. 8.4.11.1 Motor Status Readback
        2. 8.4.11.2 Motor Speed Readback
          1. 8.4.11.2.1 Two-Byte Register Readback
        3. 8.4.11.3 Motor Electrical Period Readback
        4. 8.4.11.4 BEMF Constant Readback
        5. 8.4.11.5 Motor Estimated Position by IPD
        6. 8.4.11.6 Supply Voltage Readback
        7. 8.4.11.7 Speed Command Readback
        8. 8.4.11.8 Speed Command Buffer Readback
        9. 8.4.11.9 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 Definition
        1. Table 9. Register Description
  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 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Receiving Notification of Documentation Updates
    6. 12.6 Community Resources
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.1.1 Motor Phase Resistance

For a wye-connected motor, the motor phase resistance refers to the resistance from the phase output to the center tap, RPH_CT (see Figure 8).

DRV10975 DRV10975Z wye_conn_motor_R_LVSCP2.gifFigure 8. Wye-Connected Motor Phase Resistance

For a delta-connected motor, the motor phase resistance refers to the equivalent phase to center tap in the wye configuration, which is represented as RY. RPH_CT = RY (see Figure 9).

For both the delta-connected motor and the wye-connected motor, calculating the equivalent RPH_CT is easy by measuring the resistance between two phase terminals (RPH_PH), and then dividing this value by two as shown inEquation 1.

Equation 1. RPH_CT = ½RPH_PH
DRV10975 DRV10975Z delta_conn_motor_R_LVSCP2.gifFigure 9. Delta-Connected Motor and the Equivalent Wye Connections

The motor phase resistance (RPH_CT) must be converted to a 7-bit digital register value Rm[6:0] to program the motor phase resistance value. The digital register value can be determined as follows:

  1. Convert the motor phase resistance (RPH_CT) to a digital value where the LSB is weighted to represent 7.35 mΩ: Rmdig = RPH_CT / 0.00735.
  2. Encode the digital value such that Rmdig = Rm[3:0] << Rm[6:4].

The maximum resistor value, RPH_CT, that can be programmed for the DRV10975 is 14.1 Ω, which represents Rmdig = 1920 and an encoded Rm[6:0] value of 0x7Fh. The minimum resistor the DRV10975 supports is 0.0294 Ω, RPH_CT, which represents Rmdig = 4.

For convenience, the encoded value for Rm[6:0] can also be obtained from Table 2.

Table 2. Motor Phase Resistance Look-Up Table

RPH_CT (Ω) RM[6:0] HEX RPH_CT (Ω) RM[6:0] HEX RPH_CT (Ω) RM[6:0] HEX
0 000 0000 00 0.235 010 1000 28 1.88 101 1000 58
0.0073 000 0001 01 0.264 010 1001 29 2.11 101 1001 59
0.0147 000 0010 02 0.294 010 1010 2A 2.35 101 1010 5A
0.0220 000 0011 03 0.323 010 1011 2B 2.58 101 1011 5B
0.0294 000 0100 04 0.352 010 1100 2C 2.82 101 1100 5C
0.0367 000 0101 05 0.382 010 1101 2D 3.05 101 1101 5D
0.0441 000 0110 06 0.411 010 1110 2E 3.29 101 1110 5E
0.0514 000 0111 07 0.441 010 1111 2F 3.52 101 1111 5F
0.0588 000 1000 08 0.47 011 1000 38 3.76 110 1000 68
0.0661 000 1001 09 0.529 011 1001 39 4.23 110 1001 69
0.0735 000 1010 0A 0.588 011 1010 3A 4.7 110 1010 6A
0.0808 000 1011 0B 0.646 011 1011 3B 5.17 110 1011 6B
0.0882 000 1100 0C 0.705 011 1100 3C 5.64 110 1100 6C
0.0955 000 1101 0D 0.764 011 1101 3D 6.11 110 1101 6D
0.102 000 1110 0E 0.823 011 1110 3E 6.58 110 1110 6E
0.110 000 1111 0F 0.882 011 1111 3F 7.05 110 1111 6F
0.117 001 1000 18 0.94 100 1000 48 7.52 111 1000 78
0.132 001 1001 19 1.05 100 1001 49 8.46 111 1001 79
0.147 001 1010 1A 1.17 100 1010 4A 9.4 111 1010 7A
0.161 001 1011 1B 1.29 100 1011 4B 10.3 111 1011 7B
0.176 001 1100 1C 1.41 100 1100 4C 11.2 111 1100 7C
0.191 001 1101 1D 1.52 100 1101 4D 12.2 111 1101 7D
0.205 001 1110 1E 1.64 100 1110 4E 13.1 111 1110 7E
0.22 001 1111 1F 1.76 100 1111 4F 14.1 111 1111 7F