SLLSFH8A August   2021  – December 2021 MCT8316A


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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 Characteristics of the SDA and SCL bus for Standard and Fast mode
    7. 7.7 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Output Stage
      2. 8.3.2  Device Interface Modes
        1. Interface - Control and Monitoring
        2. I2C Interface
        3. Hardware Interface - Pin Configuration
      3. 8.3.3  Step-Down Mixed-Mode Buck Regulator
        1. Buck in Inductor Mode
        2. Buck in Resistor mode
        3. Buck Regulator with External LDO
        4. AVDD Power Sequencing from Buck Regulator
        5. Mixed Mode Buck Operation and Control
        6. Buck Undervoltage Protection
        7. Buck Overcurrent Protection
      4. 8.3.4  AVDD Linear Voltage Regulator
      5. 8.3.5  Charge Pump
      6. 8.3.6  Slew Rate Control
      7. 8.3.7  Cross Conduction (Dead Time)
      8. 8.3.8  SPEED Control
        1. Analog-Mode Speed Control
        2. PWM-Mode Speed Control
        3. I2C based Speed Control
        4. Frequency-Mode Speed Control
      9. 8.3.9  Starting the Motor Under Different Initial Conditions
        1. Case 1 – Motor is Stationary
        2. Case 2 – Motor is Spinning in the Forward Direction
        3. Case 3 – Motor is Spinning in the Reverse Direction
      10. 8.3.10 Motor Start Sequence (MSS)
        1. Initial Speed Detect (ISD)
        2. Motor Resynchronization
        3. Reverse Drive
        4. Motor Start-up
          1. Align
          2. Double Align
          3. Initial Position Detection (IPD)
            1. IPD Operation
            2. IPD Release Mode
            3. IPD Advance Angle
          4. Slow First Cycle Startup
          5. Open loop
          6. Transition from Open to Closed Loop
      11. 8.3.11 Closed Loop Operation
        1. 120o Commutation
          1. High-Side Modulation
          2. Low-Side Modulation
          3. Mixed Modulation
        2. Variable Commutation (Available only in MCT8316AV)
        3. Lead Angle Control
        4. Closed loop accelerate
      12. 8.3.12 Speed Loop (Available only in MCT8316AV)
      13. 8.3.13 Input Power Regulation (Available only in MCT8316AV)
      14. 8.3.14 Anti-Voltage Surge (AVS)
      15. 8.3.15 Output PWM Switching Frequency
      16. 8.3.16 Fast Start-up (< 50 ms)
        1. BEMF Threshold
        2. Dynamic Degauss
      17. 8.3.17 Fast Deceleration
      18. 8.3.18 Active Demagnetization
        1. Active Demagnetization in action
      19. 8.3.19 Motor Stop Options
        1. Coast (Hi-Z) Mode
        2. Recirculation Mode
        3. Low-Side Braking
        4. High-Side Braking
        5. Active Spin-Down
      20. 8.3.20 FG Configuration
        1. FG Output Frequency
        2. FG Open-Loop and Lock Behavior
      21. 8.3.21 Protections
        1.  VM Supply Undervoltage Lockout
        2.  AVDD Undervoltage Lockout (AVDD_UV)
        3.  BUCK Undervoltage Lockout (BUCK_UV)
        4.  VCP Charge Pump Undervoltage Lockout (CPUV)
        5.  Overvoltage Protection (OVP)
        6.  Overcurrent Protection (OCP)
          1. OCP Latched Shutdown (OCP_MODE = 00b)
          2. OCP Automatic Retry (OCP_MODE = 01b)
          3. OCP Report Only (OCP_MODE = 10b)
          4. OCP Disabled (OCP_MODE = 11b)
        7.  Buck Overcurrent Protection
        8.  Cycle-by-Cycle (CBC) Current Limit (CBC_ILIMIT)
          1. CBC_ILIMIT Automatic Recovery next PWM Cycle (CBC_ILIMIT_MODE = 000xb)
          2. CBC_ILIMIT Automatic Recovery Threshold Based (CBC_ILIMIT_MODE = 001xb)
          3. CBC_ILIMIT Automatic Recovery after 'n' PWM Cycles (CBC_ILIMIT_MODE = 010xb)
          4. CBC_ILIMIT Report Only (CBC_ILIMIT_MODE = 0110b)
          5. CBC_ILIMIT Disabled (CBC_ILIMIT_MODE = 0111b or 1xxxb)
        9.  Lock Detection Current Limit (LOCK_ILIMIT)
          1. LOCK_ILIMIT Latched Shutdown (LOCK_ILIMIT_MODE = 00xxb)
          2. LOCK_ILIMIT Automatic Recovery (LOCK_ILIMIT_MODE = 01xxb)
          3. LOCK_ILIMIT Report Only (LOCK_ILIMIT_MODE = 1000b)
          4. LOCK_ILIMIT Disabled (LOCK_ILIMIT_MODE = 1xx1b)
        10. Thermal Warning (OTW)
        11. Thermal Shutdown (TSD)
        12. Motor Lock (MTR_LCK)
          1. MTR_LCK Latched Shutdown (MTR_LCK_MODE = 00xxb)
          2. MTR_LCK Automatic Recovery (MTR_LCK_MODE= 01xxb)
          3. MTR_LCK Report Only (MTR_LCK_MODE = 1000b)
          4. MTR_LCK Disabled (MTR_LCK_MODE = 1xx1b)
        13. Motor Lock Detection
          1. Lock 1: Abnormal Speed (ABN_SPEED)
          2. Lock 2: Loss of Sync (LOSS_OF_SYNC)
          3. Lock3: No-Motor Fault (NO_MTR)
        14. IPD Faults
    4. 8.4 Device Functional Modes
      1. 8.4.1 Functional Modes
        1. Sleep Mode
        2. Standby Mode
        3. Fault Reset (CLR_FLT)
    5. 8.5 External Interface
      1. 8.5.1 DRVOFF Functionality
      2. 8.5.2 DAC outputs
      3. 8.5.3 SOX Output
      4. 8.5.4 Oscillator Source
        1. External Clock Source (Available for MCT8316AV)
      5. 8.5.5 External Watchdog (Available only in MCT836AV)
    6. 8.6 EEPROM access and I2C interface
      1. 8.6.1 EEPROM Access
        1. EEPROM Write
        2. EEPROM Read
      2. 8.6.2 I2C Serial Interface (Available only in MCT8316AV)
        1. I2C Data Word
        2. I2C Write Operation
        3. I2C Read Operation
        4. Examples of MCT8316A I2C Communication Protocol Packets
        5. Internal Buffers
        6. CRC Byte Calculation
    7. 8.7 EEPROM (Non-Volatile) Register Map
      1. 8.7.1 Algorithm_Configuration Registers
      2. 8.7.2 Fault_Configuration Registers
      3. 8.7.3 Hardware_Configuration Registers
      4. 8.7.4 Gate_Driver_Configuration Registers
    8. 8.8 RAM (Volatile) Register Map
      1. 8.8.1 Fault_Status Registers
      2. 8.8.2 System_Status Registers
      3. 8.8.3 Algo_Control Registers
      4. 8.8.4 Device_Control Registers
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Application curves
        1. Motor startup
        2. 120o and variable commutation
        3. Faster startup time
        4. Setting the BEMF threshold
        5. Maximum speed
        6. Faster deceleration
  10. 10Power Supply Recommendations
    1. 10.1 Bulk Capacitance
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
      1. 11.3.1 Power Dissipation
  12. 12Device and Documentation Support
    1. 12.1 Support Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

Package Options

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

Motor Start Sequence (MSS)

Figure 8-19 shows the motor-start sequence implemented in the MCT8316A device.

Figure 8-19 Motor Starting-Up Flow
    Power-On StateThis is the initial state of the Motor Start Sequence (MSS). The MSS starts in this state on initial power-up or whenever the MCT8316A device comes out of standby or sleep mode.
    DIR Change Judgement In MCT8316A, if direction change command is detected at start of MSS, the motor direction detected in ISD is assumed to be opposite to commanded direction and reverse drive is performed if RVS_DR_EN is set to 1b.
    ISD_EN Judgement After power-on, the MCT8316A MSS enters the ISD_EN judgement where it checks to see if the initial speed detect (ISD) function is enabled (ISD_EN = 1b). If ISD is disabled, the MSS proceeds directly to the BRAKE_EN judgement. If ISD is enabled, MSS advances to the ISD (Is Motor Stationary) state.
    ISD State The MSS determines the initial condition (speed, direction of spin) of the motor (see Section If motor is deemed to be stationary (motor BEMF < STAT_DETECT_THR), the MSS proceeds to STAT_BRK_EN judgement. If the motor is not stationary, MSS proceeds to verify the direction of spin.
    STAT_BRK_EN Judgement The MSS checks if the stationary brake function is enabled (STAT_BRK_EN =1b). If the stationary brake function is enabled, the MSS advances to the stationary brake routine. If the stationary brake function is disabled, the MSS advances to motor start-up state (see Section
    Stationary Brake Routine The stationary brake routine can be used to ensure the motor is completely stationary before attempting to start the motor. The stationary brake is applied by turning on all three low-side driver MOSFETs for a time configured by STARTUP_BRK_TIME.
    Direction of Spin Judgement The MSS determines whether the motor is spinning in the forward or the reverse direction. If the motor is spinning in the forward direction, the MCT8316A proceeds to the RESYNC_EN judgement. If the motor is spinning in the reverse direction, the MSS proceeds to the RVS_DR_EN judgement.
    RESYNC_EN Judgement If RESYNC_EN is set to 1b, MCT8316A proceeds to BEMF > RESYNC_MIN_THRESHOLD judgement. If RESYNC_EN is set to 0b, MSS proceeds to HIZ_EN judgement.
    BEMF > RESYNC_MIN_THRESHOLD Judgement If motor speed is such that BEMF > RESYNC_MIN_THRESHOLD, MCT8316A uses the speed and position information from the ISD state to transition to the closed loop state (see Section ) directly. If BEMF < RESYNC_MIN_THRESHOLD, MCT8316A proceeds to STAT_BRK_EN judgement.
    RVS_DR_EN Judgement The MSS checks to see if the reverse drive function is enabled (RVS_DR_EN = 1). If it is enabled, the MSS transitions to check speed of the motor in reverse direction. If the reverse drive function is not enabled, the MSS advances to the HIZ_EN judgement.
    Speed > Open to Closed Loop Handoff Judgement The MSS checks to see if the reverse speed is high enough for MCT8316A to decelerate in closed loop. Till the speed (in reverse direction) is high enough, MSS stays in reverse closed loop deceleration. If speed is too low, then the MSS transitions to reverse open loop deceleration.
    Reverse Closed Loop, Open Loop Deceleration and Zero Speed Crossover The MCT8316A resynchronizes in the reverse direction, decelerates the motor in closed loop till motor speed falls below the handoff threshold. (see Section When motor speed in reverse direction is too low, the MCT8316A switches to open-loop, decelerates the motor in open-loop, crosses zero speed, and accelerates in the forward direction in open-loop before entering closed loop operation after motor speed is sufficiently high.
    HIZ_EN Judgement The MSS checks to determine whether the coast (Hi-Z) function is enabled (HIZ_EN =1). If the coast function is enabled, the MSS advances to the coast routine. If the coast function is disabled, the MSS advances to the BRAKE_EN judgement.
    Coast (Hi-Z) Routine The device coasts the motor by turning OFF all six MOSFETs for a certain time configured by HIZ_TIME.
    BRAKE_EN Judgement The MSS checks to determine whether the brake function is enabled (BRAKE_EN =1). If the brake function is enabled, the MSS advances to the brake routine. If the brake function is disabled, the MSS advances to the motor start-up state (see Section
    Brake Routine MCT8316A implements either a time based brake (duration configured by BRK_TIME) or a current based brake (brake applied till phase currents < BRK_CURR_THR) based on BRK_CONFIG. Brake is applied either using high-side or low-side MOSFETs based on BRK_MODE configuration.
    Closed Loop StateIn this state, the MCT8316A drives the motor with trapezoidal control.