SLLSFP7A december   2022  – april 2023 MCT8315A

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Characteristics of the SDA and SCL bus for Standard and Fast mode
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Output Stage
      2. 7.3.2  Device Interface
        1. 7.3.2.1 Interface - Control and Monitoring
        2. 7.3.2.2 I2C Interface
      3. 7.3.3  Step-Down Mixed-Mode Buck Regulator
        1. 7.3.3.1 Buck in Inductor Mode
        2. 7.3.3.2 Buck in Resistor mode
        3. 7.3.3.3 Buck Regulator with External LDO
        4. 7.3.3.4 AVDD Power Sequencing from Buck Regulator
        5. 7.3.3.5 Mixed Mode Buck Operation and Control
        6. 7.3.3.6 Buck Under Voltage Protection
        7. 7.3.3.7 Buck Over Current Protection
      4. 7.3.4  AVDD Linear Voltage Regulator
      5. 7.3.5  Charge Pump
      6. 7.3.6  Slew Rate Control
      7. 7.3.7  Cross Conduction (Dead Time)
      8. 7.3.8  Speed Control
        1. 7.3.8.1 Analog Mode Speed Control
        2. 7.3.8.2 PWM Mode Speed Control
        3. 7.3.8.3 I2C based Speed Control
        4. 7.3.8.4 Frequency Mode Speed Control
      9. 7.3.9  Starting the Motor Under Different Initial Conditions
        1. 7.3.9.1 Case 1 – Motor is Stationary
        2. 7.3.9.2 Case 2 – Motor is Spinning in the Forward Direction
        3. 7.3.9.3 Case 3 – Motor is Spinning in the Reverse Direction
      10. 7.3.10 Motor Start Sequence (MSS)
        1. 7.3.10.1 Initial Speed Detect (ISD)
        2. 7.3.10.2 Motor Resynchronization
        3. 7.3.10.3 Reverse Drive
        4. 7.3.10.4 Motor Start-up
          1. 7.3.10.4.1 Align
          2. 7.3.10.4.2 Double Align
          3. 7.3.10.4.3 Initial Position Detection (IPD)
            1. 7.3.10.4.3.1 IPD Operation
            2. 7.3.10.4.3.2 IPD Release Mode
            3. 7.3.10.4.3.3 IPD Advance Angle
          4. 7.3.10.4.4 Slow First Cycle Startup
          5. 7.3.10.4.5 Open loop
          6. 7.3.10.4.6 Transition from Open to Closed Loop
      11. 7.3.11 Closed Loop Operation
        1. 7.3.11.1 120o Commutation
          1. 7.3.11.1.1 High-Side Modulation
          2. 7.3.11.1.2 Low-Side Modulation
          3. 7.3.11.1.3 Mixed Modulation
        2. 7.3.11.2 Variable Commutation
        3. 7.3.11.3 Lead Angle Control
        4. 7.3.11.4 Closed loop accelerate
      12. 7.3.12 Speed Loop
      13. 7.3.13 Input Power Regulation
      14. 7.3.14 Anti-Voltage Surge (AVS)
      15. 7.3.15 Output PWM Switching Frequency
      16. 7.3.16 Fast Start-up (< 50 ms)
        1. 7.3.16.1 BEMF Threshold
        2. 7.3.16.2 Dynamic Degauss
      17. 7.3.17 Fast Deceleration
      18. 7.3.18 Active Demagnetization
        1. 7.3.18.1 Active Demagnetization in action
      19. 7.3.19 Motor Stop Options
        1. 7.3.19.1 Coast (Hi-Z) Mode
        2. 7.3.19.2 Recirculation Mode
        3. 7.3.19.3 Low-Side Braking
        4. 7.3.19.4 High-Side Braking
        5. 7.3.19.5 Active Spin-Down
      20. 7.3.20 FG Configuration
        1. 7.3.20.1 FG Output Frequency
        2. 7.3.20.2 FG Open-Loop and Lock Behavior
      21. 7.3.21 Protections
        1. 7.3.21.1  VM Supply Undervoltage Lockout
        2. 7.3.21.2  AVDD Undervoltage Lockout (AVDD_UV)
        3. 7.3.21.3  BUCK Undervoltage Lockout (BUCK_UV)
        4. 7.3.21.4  VCP Charge Pump Undervoltage Lockout (CPUV)
        5. 7.3.21.5  Overvoltage Protection (OVP)
        6. 7.3.21.6  Overcurrent Protection (OCP)
          1. 7.3.21.6.1 OCP Latched Shutdown (OCP_MODE = 00b)
          2. 7.3.21.6.2 OCP Automatic Retry (OCP_MODE = 01b)
          3. 7.3.21.6.3 OCP Report Only (OCP_MODE = 10b)
          4. 7.3.21.6.4 OCP Disabled (OCP_MODE = 11b)
        7. 7.3.21.7  Buck Overcurrent Protection
        8. 7.3.21.8  Cycle-by-Cycle (CBC) Current Limit (CBC_ILIMIT)
          1. 7.3.21.8.1 CBC_ILIMIT Automatic Recovery next PWM Cycle (CBC_ILIMIT_MODE = 000xb)
          2. 7.3.21.8.2 CBC_ILIMIT Automatic Recovery Threshold Based (CBC_ILIMIT_MODE = 001xb)
          3. 7.3.21.8.3 CBC_ILIMIT Automatic Recovery after 'n' PWM Cycles (CBC_ILIMIT_MODE = 010xb)
          4. 7.3.21.8.4 CBC_ILIMIT Report Only (CBC_ILIMIT_MODE = 0110b)
          5. 7.3.21.8.5 CBC_ILIMIT Disabled (CBC_ILIMIT_MODE = 0111b or 1xxxb)
        9. 7.3.21.9  Lock Detection Current Limit (LOCK_ILIMIT)
          1. 7.3.21.9.1 LOCK_ILIMIT Latched Shutdown (LOCK_ILIMIT_MODE = 00xxb)
          2. 7.3.21.9.2 LOCK_ILIMIT Automatic Recovery (LOCK_ILIMIT_MODE = 01xxb)
          3. 7.3.21.9.3 LOCK_ILIMIT Report Only (LOCK_ILIMIT_MODE = 1000b)
          4. 7.3.21.9.4 LOCK_ILIMIT Disabled (LOCK_ILIMIT_MODE = 1xx1b)
        10. 7.3.21.10 Thermal Warning (OTW)
        11. 7.3.21.11 Thermal Shutdown (TSD)
        12. 7.3.21.12 Motor Lock (MTR_LCK)
          1. 7.3.21.12.1 MTR_LCK Latched Shutdown (MTR_LCK_MODE = 00xxb)
          2. 7.3.21.12.2 MTR_LCK Automatic Recovery (MTR_LCK_MODE= 01xxb)
          3. 7.3.21.12.3 MTR_LCK Report Only (MTR_LCK_MODE = 1000b)
          4. 7.3.21.12.4 MTR_LCK Disabled (MTR_LCK_MODE = 1xx1b)
        13. 7.3.21.13 Motor Lock Detection
          1. 7.3.21.13.1 Lock 1: Abnormal Speed (ABN_SPEED)
          2. 7.3.21.13.2 Lock 2: Loss of Sync (LOSS_OF_SYNC)
          3. 7.3.21.13.3 Lock3: No-Motor Fault (NO_MTR)
        14. 7.3.21.14 SW VM Undervoltage Protection
        15. 7.3.21.15 SW VM Overvoltage Protection
        16. 7.3.21.16 IPD Faults
    4. 7.4 Device Functional Modes
      1. 7.4.1 Functional Modes
        1. 7.4.1.1 Sleep Mode
        2. 7.4.1.2 Standby Mode
        3. 7.4.1.3 Fault Reset (CLR_FLT)
    5. 7.5 External Interface
      1. 7.5.1 DRVOFF Functionality
      2. 7.5.2 DAC outputs
      3. 7.5.3 Current Sense Output
      4. 7.5.4 Oscillator Source
        1. 7.5.4.1 External Clock Source
      5. 7.5.5 External Watchdog
    6. 7.6 EEPROM access and I2C interface
      1. 7.6.1 EEPROM Access
        1. 7.6.1.1 EEPROM Write
        2. 7.6.1.2 EEPROM Read
      2. 7.6.2 I2C Serial Interface
        1. 7.6.2.1 I2C Data Word
        2. 7.6.2.2 I2C Write Transaction
        3. 7.6.2.3 I2C Read Transaction
        4. 7.6.2.4 I2C Communication Protocol Packet Examples
        5. 7.6.2.5 I2C Clock Stretching
        6. 7.6.2.6 CRC Byte Calculation
    7. 7.7 EEPROM (Non-Volatile) Register Map
      1. 7.7.1 Algorithm_Configuration Registers
      2. 7.7.2 Fault_Configuration Registers
      3. 7.7.3 Hardware_Configuration Registers
      4. 7.7.4 Gate_Driver_Configuration Registers
    8. 7.8 RAM (Volatile) Register Map
      1. 7.8.1 Fault_Status Registers
      2. 7.8.2 System_Status Registers
      3. 7.8.3 Algo_Control Registers
      4. 7.8.4 Device_Control Registers
      5. 7.8.5 Algorithm_Variables Registers
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Application curves
        1. 8.2.1.1 Motor startup
        2. 8.2.1.2 120o and variable commutation
        3. 8.2.1.3 Faster startup time
        4. 8.2.1.4 Setting the BEMF threshold
        5. 8.2.1.5 Maximum speed
        6. 8.2.1.6 Faster deceleration
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Support Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

Package Options

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

7.8.5 Algorithm_Variables Registers

Table 7-53 lists the memory-mapped registers for the Algorithm_Variables registers. All register offset addresses not listed in Table 7-53 should be considered as reserved locations and the register contents should not be modified.

Table 7-53 ALGORITHM_VARIABLES Registers
OffsetAcronymRegister NameSection
40ChINPUT_DUTYInput Duty CycleINPUT_DUTY Register (Offset = 40Ch) [Reset = 00000000h]
4F6hCURRENT_DUTYCurrent Duty CycleCURRENT_DUTY Register (Offset = 4F6h) [Reset = 00000000h]
506hSET_DUTYSet Duty CycleSET_DUTY Register (Offset = 506h) [Reset = 00000000h]
5B2hMOTOR_SPEED_PUMotor Speed in PUMOTOR_SPEED_PU Register (Offset = 5B2h) [Reset = 00000000h]
6F4hDC_BUS_POWER_PUDC Bus Power in PUDC_BUS_POWER_PU Register (Offset = 6F4h) [Reset = 00000000h]

Complex bit access types are encoded to fit into small table cells. Table 7-54 shows the codes that are used for access types in this section.

Table 7-54 Algorithm_Variables Access Type Codes
Access TypeCodeDescription
Read Type
RRRead
Reset or Default Value
-nValue after reset or the default value

7.8.5.1 INPUT_DUTY Register (Offset = 40Ch) [Reset = 00000000h]

INPUT_DUTY is shown in Figure 7-83 and described in Table 7-55.

Return to the Summary Table.

Input duty cycle from SPEED pin or SPEED_CMD (Input duty cycle( in %) = (Measured voltage on DAC pin) / 3V *100 )

Figure 7-83 INPUT_DUTY Register
313029282726252423222120191817161514131211109876543210
INPUT_DUTY
R-0h
Table 7-55 INPUT_DUTY Register Field Descriptions
BitFieldTypeResetDescription
31-0INPUT_DUTYR0h 32-bit value indicating the duty cycle that the user commands Input duty cycle (in %) = (Input Duty Cycle / 230) * 100

7.8.5.2 CURRENT_DUTY Register (Offset = 4F6h) [Reset = 00000000h]

CURRENT_DUTY is shown in Figure 7-84 and described in Table 7-56.

Return to the Summary Table.

Current duty cycle (Current duty cycle( in %) = (Measured voltage on DAC pin) / 3V *100 )

Figure 7-84 CURRENT_DUTY Register
313029282726252423222120191817161514131211109876543210
CURRENT_DUTY
R-0h
Table 7-56 CURRENT_DUTY Register Field Descriptions
BitFieldTypeResetDescription
31-0CURRENT_DUTYR0h 32-bit value indicating the duty cycle that is currently being applied. Current duty cycle (in %) = (Current Duty Cycle / 230) * 100

7.8.5.3 SET_DUTY Register (Offset = 506h) [Reset = 00000000h]

SET_DUTY is shown in Figure 7-85 and described in Table 7-57.

Return to the Summary Table.

Target duty cycle (Set duty cycle( in %) = (Measured voltage on DAC pin) / 3V *100 )

Figure 7-85 SET_DUTY Register
313029282726252423222120191817161514131211109876543210
SET_DUTY
R-0h
Table 7-57 SET_DUTY Register Field Descriptions
BitFieldTypeResetDescription
31-0SET_DUTYR0h 32-bit value indicating the duty cycle that the FW wants. Set duty cycle (in %) = (Set Duty Cycle / 230) * 100

7.8.5.4 MOTOR_SPEED_PU Register (Offset = 5B2h) [Reset = 00000000h]

MOTOR_SPEED_PU is shown in Figure 7-86 and described in Table 7-58.

Return to the Summary Table.

Motor speed in PU (Motor speed (in Hz) = (Measured voltage on DAC pin) / 3V * Maximum speed (in Hz)) Maximum speed (in Hz) = MAX_SPEED/16

Figure 7-86 MOTOR_SPEED_PU Register
313029282726252423222120191817161514131211109876543210
MOTOR_SPEED_PU
R-0h
Table 7-58 MOTOR_SPEED_PU Register Field Descriptions
BitFieldTypeResetDescription
31-0MOTOR_SPEED_PUR0h 32-bit value indicating the speed of the motor. Motor speed (in Hz) = (Motor Speed in PU / 230) * (MAX_SPEED / 16)

7.8.5.5 DC_BUS_POWER_PU Register (Offset = 6F4h) [Reset = 00000000h]

DC_BUS_POWER_PU is shown in Figure 7-87 and described in Table 7-59.

Return to the Summary Table.

DC bus power in PU (DC bus power( in W) = (Measured voltage on DAC pin) / 3V * Maximum power(in W)) Maximum power (in W) = MAX_POWER/4

Figure 7-87 DC_BUS_POWER_PU Register
313029282726252423222120191817161514131211109876543210
DC_BUS_POWER_PU
R-0h
Table 7-59 DC_BUS_POWER_PU Register Field Descriptions
BitFieldTypeResetDescription
31-0DC_BUS_POWER_PUR0h 32-bit value indicating the power drawn by the motor. DC Bus Power (in W) = (DC Bus Power in PU / 230) * (MAX_POWER / 4)