SLLSFH8B August   2021  – February 2022 MCT8316A

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and 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 Characteristics of the SDA and SCL bus for Standard and Fast mode
    7. 7.7 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  Output Stage
      2. 8.3.2  Device Interface Modes
        1. 8.3.2.1 Interface - Control and Monitoring
        2. 8.3.2.2 I2C Interface
        3. 8.3.2.3 Hardware Interface - Pin Configuration
      3. 8.3.3  Step-Down Mixed-Mode Buck Regulator
        1. 8.3.3.1 Buck in Inductor Mode
        2. 8.3.3.2 Buck in Resistor mode
        3. 8.3.3.3 Buck Regulator with External LDO
        4. 8.3.3.4 AVDD Power Sequencing from Buck Regulator
        5. 8.3.3.5 Mixed Mode Buck Operation and Control
        6. 8.3.3.6 Buck Undervoltage Protection
        7. 8.3.3.7 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. 8.3.8.1 Analog-Mode Speed Control
        2. 8.3.8.2 PWM-Mode Speed Control
        3. 8.3.8.3 I2C based Speed Control
        4. 8.3.8.4 Frequency-Mode Speed Control
      9. 8.3.9  Starting the Motor Under Different Initial Conditions
        1. 8.3.9.1 Case 1 – Motor is Stationary
        2. 8.3.9.2 Case 2 – Motor is Spinning in the Forward Direction
        3. 8.3.9.3 Case 3 – Motor is Spinning in the Reverse Direction
      10. 8.3.10 Motor Start Sequence (MSS)
        1. 8.3.10.1 Initial Speed Detect (ISD)
        2. 8.3.10.2 Motor Resynchronization
        3. 8.3.10.3 Reverse Drive
        4. 8.3.10.4 Motor Start-up
          1. 8.3.10.4.1 Align
          2. 8.3.10.4.2 Double Align
          3. 8.3.10.4.3 Initial Position Detection (IPD)
            1. 8.3.10.4.3.1 IPD Operation
            2. 8.3.10.4.3.2 IPD Release Mode
            3. 8.3.10.4.3.3 IPD Advance Angle
          4. 8.3.10.4.4 Slow First Cycle Startup
          5. 8.3.10.4.5 Open loop
          6. 8.3.10.4.6 Transition from Open to Closed Loop
      11. 8.3.11 Closed Loop Operation
        1. 8.3.11.1 120o Commutation
          1. 8.3.11.1.1 High-Side Modulation
          2. 8.3.11.1.2 Low-Side Modulation
          3. 8.3.11.1.3 Mixed Modulation
        2. 8.3.11.2 Variable Commutation (Available only in MCT8316AV)
        3. 8.3.11.3 Lead Angle Control
        4. 8.3.11.4 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. 8.3.16.1 BEMF Threshold
        2. 8.3.16.2 Dynamic Degauss
      17. 8.3.17 Fast Deceleration
      18. 8.3.18 Active Demagnetization
        1. 8.3.18.1 Active Demagnetization in action
      19. 8.3.19 Motor Stop Options
        1. 8.3.19.1 Coast (Hi-Z) Mode
        2. 8.3.19.2 Recirculation Mode
        3. 8.3.19.3 Low-Side Braking
        4. 8.3.19.4 High-Side Braking
        5. 8.3.19.5 Active Spin-Down
      20. 8.3.20 FG Configuration
        1. 8.3.20.1 FG Output Frequency
        2. 8.3.20.2 FG Open-Loop and Lock Behavior
      21. 8.3.21 Protections
        1. 8.3.21.1  VM Supply Undervoltage Lockout
        2. 8.3.21.2  AVDD Undervoltage Lockout (AVDD_UV)
        3. 8.3.21.3  BUCK Undervoltage Lockout (BUCK_UV)
        4. 8.3.21.4  VCP Charge Pump Undervoltage Lockout (CPUV)
        5. 8.3.21.5  Overvoltage Protection (OVP)
        6. 8.3.21.6  Overcurrent Protection (OCP)
          1. 8.3.21.6.1 OCP Latched Shutdown (OCP_MODE = 00b)
          2. 8.3.21.6.2 OCP Automatic Retry (OCP_MODE = 01b)
          3. 8.3.21.6.3 OCP Report Only (OCP_MODE = 10b)
          4. 8.3.21.6.4 OCP Disabled (OCP_MODE = 11b)
        7. 8.3.21.7  Buck Overcurrent Protection
        8. 8.3.21.8  Cycle-by-Cycle (CBC) Current Limit (CBC_ILIMIT)
          1. 8.3.21.8.1 CBC_ILIMIT Automatic Recovery next PWM Cycle (CBC_ILIMIT_MODE = 000xb)
          2. 8.3.21.8.2 CBC_ILIMIT Automatic Recovery Threshold Based (CBC_ILIMIT_MODE = 001xb)
          3. 8.3.21.8.3 CBC_ILIMIT Automatic Recovery after 'n' PWM Cycles (CBC_ILIMIT_MODE = 010xb)
          4. 8.3.21.8.4 CBC_ILIMIT Report Only (CBC_ILIMIT_MODE = 0110b)
          5. 8.3.21.8.5 CBC_ILIMIT Disabled (CBC_ILIMIT_MODE = 0111b or 1xxxb)
        9. 8.3.21.9  Lock Detection Current Limit (LOCK_ILIMIT)
          1. 8.3.21.9.1 LOCK_ILIMIT Latched Shutdown (LOCK_ILIMIT_MODE = 00xxb)
          2. 8.3.21.9.2 LOCK_ILIMIT Automatic Recovery (LOCK_ILIMIT_MODE = 01xxb)
          3. 8.3.21.9.3 LOCK_ILIMIT Report Only (LOCK_ILIMIT_MODE = 1000b)
          4. 8.3.21.9.4 LOCK_ILIMIT Disabled (LOCK_ILIMIT_MODE = 1xx1b)
        10. 8.3.21.10 Thermal Warning (OTW)
        11. 8.3.21.11 Thermal Shutdown (TSD)
        12. 8.3.21.12 Motor Lock (MTR_LCK)
          1. 8.3.21.12.1 MTR_LCK Latched Shutdown (MTR_LCK_MODE = 00xxb)
          2. 8.3.21.12.2 MTR_LCK Automatic Recovery (MTR_LCK_MODE= 01xxb)
          3. 8.3.21.12.3 MTR_LCK Report Only (MTR_LCK_MODE = 1000b)
          4. 8.3.21.12.4 MTR_LCK Disabled (MTR_LCK_MODE = 1xx1b)
        13. 8.3.21.13 Motor Lock Detection
          1. 8.3.21.13.1 Lock 1: Abnormal Speed (ABN_SPEED)
          2. 8.3.21.13.2 Lock 2: Loss of Sync (LOSS_OF_SYNC)
          3. 8.3.21.13.3 Lock3: No-Motor Fault (NO_MTR)
        14. 8.3.21.14 IPD Faults
    4. 8.4 Device Functional Modes
      1. 8.4.1 Functional Modes
        1. 8.4.1.1 Sleep Mode
        2. 8.4.1.2 Standby Mode
        3. 8.4.1.3 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. 8.5.4.1 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. 8.6.1.1 EEPROM Write
        2. 8.6.1.2 EEPROM Read
      2. 8.6.2 I2C Serial Interface (Available only in MCT8316AV)
        1. 8.6.2.1 I2C Data Word
        2. 8.6.2.2 I2C Write Operation
        3. 8.6.2.3 I2C Read Operation
        4. 8.6.2.4 Examples of MCT8316A I2C Communication Protocol Packets
        5. 8.6.2.5 Internal Buffers
        6. 8.6.2.6 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. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Application curves
        1. 9.2.1.1 Motor startup
        2. 9.2.1.2 120o and variable commutation
        3. 9.2.1.3 Faster startup time
        4. 9.2.1.4 Setting the BEMF threshold
        5. 9.2.1.5 Maximum speed
        6. 9.2.1.6 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

9.2 Typical Applications

Figure 9-1 shows the typical schematic of MCT8316AV.

Figure 9-1 Primary Application Schematic

Table 9-1 lists the recommended values of the external components for MCT8316A.

Table 9-1 MCT8316A External Components
COMPONENTS PIN 1 PIN 2 RECOMMENDED
CVM1 VM PGND X5R or X7R, 0.1-µF, TI recommends a capacitor voltage rating at least twice the normal operating voltage of the device
CVM2 VM PGND ≥ 10-µF, TI recommends a capacitor voltage rating at least twice the normal operating voltage of the device
CCP CP VM X5R or X7R, 16-V, 1-µF capacitor
CFLY CPH CPL X5R or X7R, 47-nF, TI recommends a capacitor voltage rating at least twice the normal operating voltage of the pin
CAVDD AVDD AGND X5R or X7R, 1-µF, ≥ 6.3-V. In order for AVDD to accurately regulate output voltage, capacitor should have effective capacitance between 0.7-µF to 1.3-µF at 3.3-V across operating temperature.
CDVDD AVDD AGND X5R or X7R, 1-µF, ≥ 4-V. In order for DVDD to accurately regulate output voltage, capacitor should have effective capacitance between 0.6-µF to 1.3-µF at 1.5-V across operating temperature.
CBK SW_BK GND_BK X5R or X7R, buck-output rated capacitor
LBK SW_BK FB_BK Buck-output inductor
RFG 1.8 to 5-V Supply FG 5.1-kΩ, Pull-up resistor
RnFAULT 1.8 to 5-V Supply nFAULT 5.1-kΩ, Pull-up resistor
RSDA 1.8 to 3.3-V Supply SDA 5.1-kΩ, Pull-up resistor
RSCL 1.8 to 3.3-V Supply SCL 5.1-kΩ, Pull-up resistor
Recommended application range for MCT8316A is shown in Table 9-2.
Table 9-2 Recommended Application Range
Parameter Min Max Unit
Motor voltage 4.5 35 V
Motor electrical speed - 3000 Hz
Peak motor phase current - 8 A

Default EEPROM configuration for MCT8316A is listed in Table 9-3. Default values are chosen for reliable motor startup and closed loop operation. Refer to MCT8316A tuning guide which provides step by step procedure to tune a 3-phase BLDC motor in closed loop, conform to use-case and explore features in the device.

Table 9-3 Recommended Default Values
Address Name Address Recommended Value
ISD_CONFIG 0x00000080 0x6EC4C100
MOTOR_STARTUP1 0x00000082 0x2EA610E4
MOTOR_STARTUP2 0x00000084 0x1221109C
CLOSED_LOOP1 0x00000086 0x0C321200
CLOSED_LOOP2 0x00000088 0x024224B0
CLOSED_LOOP3 0x0000008A 0x4CCC03E0
CLOSED_LOOP4 0x0000008C 0x000CE944
CONST_SPEED 0x0000008E 0x00A00510
CONST_PWR 0x00000090 0x5DC04C84
FAULT_CONFIG1 0x00000092 0x60F43025
FAULT_CONFIG2 0x00000094 0x7F87A009
TRAP_CONFIG1 0x0000009A 0x0548A186
TRAP_CONFIG2 0x0000009C 0x3A840000
150_DEG_TWO_PH_PROFILE 0x00000096 0x6ADB44A6
150_DEG_THREE_PH_PROFILE 0x00000098 0x392DFF80
PIN_CONFIG1 0x000000A4 0x2D720600
PIN_CONFIG2 0x000000A6 0x08000000
DEVICE_CONFIG 0x000000A8 0x7FFF0000
PERIPH_CONFIG 0x000000AA 0x00000000
GD_CONFIG1 0x000000AC 0x1C440000
GD_CONFIG2 0x000000AE 0x00000000

Once the device EEPROM is programmed with the desired configuration, device can be operated stand-alone and I2C serial interface is not required anymore. Speed can be commanded using SPEED pin.

Below are the two essential parameters that are required to spin the motor in closed loop.

  1. Maximum motor speed.
  2. Cycle by cycle (CBC) current limit.