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  • PCB Design Guidelines for MCF8316C and MCF8315C

    • SLLA643 August   2024 MCF8315C , MCF8315C-Q1 , MCF8316C-Q1

       

  • CONTENTS
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  • PCB Design Guidelines for MCF8316C and MCF8315C
  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Power Pin Design Recommendations
    1. 2.1 VM
    2. 2.2 Charge Pump: CPH, CPL, CP
    3. 2.3 Buck Converter: FB_BK, SW_BK, GND_BK
    4. 2.4 AVDD
    5. 2.5 DVDD
    6. 2.6 PGND, AGND, DGND
    7. 2.7 Thermal Pad
  6. 3MCF831xC Buck Regulator Overview
    1. 3.1 Buck Regulator Mode of Operation
    2. 3.2 Buck Regulator Output Voltage
    3. 3.3 Buck Power Sequencing
    4. 3.4 Buck Inductor Selection
    5. 3.5 MCF831xC Operation Without Buck Regulator
  7. 4MCF831xC IO Pins Design Recommendations
    1. 4.1 SPEED Pin
    2. 4.2 BRAKE, DIR, DRVOFF pins
    3. 4.3 EXT_CLK, EXT_WD
    4. 4.4 ALARM
    5. 4.5 DACOUT1, DACOUT2
    6. 4.6 SDA, SCL
    7. 4.7 nFAULT and FG pin
  8. 5MCF831xC PCB Schematic and Layout Recommendations
    1. 5.1 Single Ground Plane
    2. 5.2 Single Ground with AVDD Shorted to FB_BK
    3. 5.3 Two Grounds
  9. 6Summary
  10. 7References
  11. IMPORTANT NOTICE
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Application Note

PCB Design Guidelines for MCF8316C and MCF8315C

Abstract

PCB design for BLDC motor control applications is an involved process that depends on various factors like cost, form factor, operating conditions, reliability, efficiency, and so on. This application note aims to minimize the PCB design time by providing recommendations for designing PCBs for motor control applications using devices belonging to the MCF831xC family of devices.

Note: MCF831xC refers to TI’s latest Sensorless FOC based integrated FET BLDC drivers including MCF8316C-Q1, MCF8315C-Q1, and MCF8315C.

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

MCF831xC is an all-in-one BLDC driver that integrates motor control logic, gate driver and FET inverter in a single IC for a small form factor complete BLDC driver design for up to 40V industrial and automotive applications. Therefore, the MCF831xC based motor control PCB design includes power and signal/GPIO domains. The power domain section provides recommendations like decoupling caps, buck converter design options (to optimize cost vs. efficiency) and ground connections. The signal/GPIO domain explains the recommended connections for each GPIO along with a detailed internal IO pad structure to help the end user make the correct design choice for the end their application. The power and signal domain recommendations are collated as three examples of PCB schematic and layout with different ground plane and power management options.

 
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