SLLSFV1 March 2025 MCF8329A-Q1
PRODUCTION DATA
- 1
- 1 Features
- 2 Applications
- 3 Description
- 4 Pin Configuration and Functions
- 5 Specifications
-
6 Detailed Description
- 6.1 Overview
- 6.2 Functional Block Diagram
- 6.3
Feature Description
- 6.3.1 Three Phase BLDC Gate Drivers
- 6.3.2 Gate Drive Architecture
- 6.3.3 AVDD Linear Voltage Regulator
- 6.3.4 Low-Side Current Sense Amplifier
- 6.3.5 Device Interface Modes
- 6.3.6 Motor Control Input Options
- 6.3.7 Bootstrap Capacitor Initial Charging
- 6.3.8 Starting the Motor Under Different Initial Conditions
- 6.3.9 Motor Start Sequence (MSS)
- 6.3.10 Closed Loop Operation
- 6.3.11 Maximum Torque Per Ampere (MTPA) Control
- 6.3.12 Flux Weakening Control
- 6.3.13 Motor Parameters
- 6.3.14 Motor Parameter Extraction Tool (MPET)
- 6.3.15 Anti-Voltage Surge (AVS)
- 6.3.16 Active Braking
- 6.3.17 Output PWM Switching Frequency
- 6.3.18 Dead Time Compensation
- 6.3.19 Voltage Sense Scaling
- 6.3.20 Motor Stop Options
- 6.3.21 FG Configuration
- 6.3.22 DC Bus Current Limit
- 6.3.23
Protections
- 6.3.23.1 PVDD Supply Undervoltage Lockout (PVDD_UV)
- 6.3.23.2 AVDD Power on Reset (AVDD_POR)
- 6.3.23.3 GVDD Undervoltage Lockout (GVDD_UV)
- 6.3.23.4 BST Undervoltage Lockout (BST_UV)
- 6.3.23.5 MOSFET VDS Overcurrent Protection (VDS_OCP)
- 6.3.23.6 VSENSE Overcurrent Protection (SEN_OCP)
- 6.3.23.7 Thermal Shutdown (OTSD)
- 6.3.23.8 Hardware Lock Detection Current Limit (HW_LOCK_ILIMIT)
- 6.3.23.9 Lock Detection Current Limit (LOCK_ILIMIT)
- 6.3.23.10 Motor Lock (MTR_LCK)
- 6.3.23.11 Motor Lock Detection
- 6.3.23.12 MPET Faults
- 6.3.23.13 IPD Faults
- 6.4 Device Functional Modes
- 6.5 External Interface
- 6.6 EEPROM access and I2C interface
- 7 EEPROM (Non-Volatile) Register Map
- 8 RAM (Volatile) Register Map
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Revision History
- 12Mechanical, Packaging, and Orderable Information
6.3.6.6 Control Input Transfer Function without Profiler
The input control signal can be motor speed, DC input power or motor voltage (motor PWM duty cycle) as configured by CLOSED_LOOP_MODE and CONST_POWER_MODE bits.
Speed Input Transfer Function
Figure 6-11 Speed Input Transfer
FunctionFigure 6-11 shows the relationship between DUTY CMD and SPEED REF. When speed loop is enabled, DUTY CMD sets the SPEED REF in Hz. MAX_SPEED sets the SPEED REF at DUTY CMD of 100%. MIN_DUTY sets the minimum SPEED REF (MIN_DUTY x MAX_SPEED). If MAX_SPEED is set to 0, SPEED REF is clamped to zero (irrespective of DUTY CMD) and motor is in stopped state.
Power Input Transfer Function
Figure 6-12 Power Input Transfer FunctionFigure 6-12 shows the relationship between DUTY CMD and POWER REF. When power loop is enabled, DUTY CMD sets the POWER REF in Watt. MAX_POWER sets the POWER REF at DUTY CMD of 100%. MIN_DUTY sets the minimum POWER REF (MIN_DUTY x MAX_POWER). If MAX_POWER is set to 0, POWER REF is clamped to zero (irrespective of DUTY CMD) and motor is in stopped state.
Current Input Transfer Function
Figure 6-13 Current Input Transfer FunctionFigure 6-13 shows the relationship between DUTY_CMD and CURRENT_REF. When the current loop is enabled, DUTY_CMD sets the q-axis CURRENT_REF (iq_ref)in Ampere. MAX_CURRENT is the same as ILIMIT and sets the CURRENT_REF at DUTY CMD of 100%. MIN_DUTY sets the minimum CURRENT_REF (MIN_DUTY x MAX_CURRENT).
- In MCF8329A-Q1, MIN_DUTY is set as 1%. Any duty command (DUTY_CMD) or reference (REF_X from input profiles) value set to < 1% will result in target reference (SPEED REF or POWER REF or CURRENT REF or MODULATION INDEX REF) being clamped to zero and motor to be in stopped state.
Modulation Index Input Transfer Function
In modulation index control mode, the voltage applied to the motor (direct axis component of modulation index Vd and quadrature axis component of modulation index Vq) is proportional to the DUTY_CMD (from MIN_DUTY to 100% PWM duty applied to motor). For DUTY CMD less than MIN_DUTY, the applied voltage to the motor is clamped to zero by making the duty cycle to zero.