Sensorless FOC - DRV8323RS Gate Driver User Guide

This User Guide outlines the usage of DRV8323RS gate driver along with the sensorless FOC Application running on MSPM0.

1. Hardware Required

  • LP-MSPM0G3507 - MSPM0G3507 Launchpad

  • BOOSTXL-DRV8323RS - BOOSTXL-DRV8323RS is a 15A, 3-phase brushless DC drive stage based on the DRV8323RH gate driver and CSD88599Q5DC NexFET™ power block

  • DC Power supply that supports the required voltage and current

  • Brushless-DC Motor

  • Micro-USB cable

2. Hardware Setup

  1. Remove the PA26 jumper J18 in the LP-MSPM0G3507 as shown below.

J18 header removed in LP-MSPM0G3507

Fig. 23 J18 header removed in LP-MSPM0G3507

  1. Connect the LP-MSPM0G3507 to the BOOSTXL-DRV8323RS in one of two ways:

    • 1 Plug the connectors J3 and J4 of the BOOSTXL-DRV8323RS to the top of the connectors J3/J4 of the LP-MSPM0G3507.

    • 2 If using the jumper wires, connect as shown in the table below. Refer to the schematic of J3 and J4 connector pinout on BOOSTXL-DRV8323RS for the location of the signals.

      Connection

      MSPM0G3507

      BOOSTXL-DRV8323RS

      Phase A HS input

      PB4

      INHA

      Phase A LS input

      PB1

      INLA

      Phase B HS input

      PA28

      INHB

      Phase B LS input

      PA31

      INLB

      Phase C HS input

      PB20

      INHC

      Phase C LS input

      PB13

      INLC

      Serial clock input

      PB9

      SCLK

      Serial data input

      PB8

      SDI

      Serial data output

      PB7

      SDO

      Chip Select

      PB0

      nSCS

      Bus voltage input

      PA25

      VSENVM

      Phase A current input

      PA17

      ISENA

      Phase B current input

      PA24

      ISENB

      Phase C current input

      PA18

      ISENC

      Phase A Voltage input

      PB19

      VSENA

      Phase B Voltage input

      PA22

      VSENB

      Phase C Voltage input

      PB18

      VSENC

      Fault Input

      PA27

      nFAULT

      DRV Enable output

      PA26

      ENABLE

      Controller Fault Output

      PA11

      LED

      Common Ground

      GND

      GND
BOOSTXL-DRV8323RS J3 and J4 connector pinout

Fig. 24 BOOSTXL-DRV8323RS J3 and J4 connector pinout

  1. For using the IPD startup feature user needs to additionally make the below connections : The three phase currents are routed to the three comparator pins on the Launch Pad as below

    Connection

    MSPM0G3507

    BOOSTXL-DRV8323RS

    COMP A input

    PA14

    ISENA

    COMP B input

    PB26

    ISENB

    COMP C input

    PB21

    ISENC

  2. Connect the 3 phases of the BLDC motor to A/B/C of connector J5 on the BOOSTXL-DRV8323RS.

  3. Connect the positive and negative of the power supply to VM and GND of the power connector terminal block.

  4. Set the power supply to a motor voltage between 4.5V to 48V within the DRV8323RS specifications and a 15-A current limit.

  5. Connect a Micro-USB cable from the LP-MSPM0G3507 to the PC.

  6. Turn on the power supply. The green VM LED on the BOOSTXL-DRV8323RS should turn on.

  7. Once all steps are completed, you can start to run the motor. Please refer to Software User Guide or FOC Tuning Guide

3. Gatedriver Register Configurations

Sensorless FOC application FW periodically configures the gate driver registers using SPI. The gatedriverInterface sub folder in the Hal directory provides users ability to add the custom gate driver functions.

The gatedriver register configurations defined under HV_DIE_EEPROM_INTERFACE_T in the DRV8323.h file are periodically updated using the API : gateDriverParamsUpdate() when the motor is not spinning. Below are the gate driver register settings available for user configuration.

Note: some of the register settings are not applicable for FOC Application FW and shouldn’t be altered from the default values.

gateDrvCfg1 configurations

Bit Field

Bit Definition

iDriveNLS

LS Idrive N setting

vdsLevel

VDS Level setting

ocpDeg

OCP Deglitch setting

ocpMode

OCP Mode setting

deadTime

Dead Time setting

tRetry

retry Time setting

senLvl

Sense Level setting

csaCalC

CSA CAL - Ph C Config

csaCalB

CSA CAL - Ph B Config

csaCalA

CSA CAL - Ph A Config

disSen

Disable Current Sense Config

csaGain

CSA Gain Configuration

lsRef

VDS LS Reference Configuration

vrefDiv

Not Applicable for FOC FW / Not to be configured

csaFET

Not Applicable for FOC FW / Not to be configured

gateDrvCfg2 configurations

Bit Field

Bit Definition

clrFLT

Gate Driver Clear Fault Bit

brake

Not Applicable for FOC FW / Not to be configured

coast

Not Applicable for FOC FW / Not to be configured

pwmDir

Not Applicable for FOC FW / Not to be configured

pwmComm

Not Applicable for FOC FW / Not to be configured

pwmMode

Not Applicable for FOC FW / Not to be configured

repOTW

Over Temperature warning report

disGDF

Disable Gate Driver

disCPUV

Disable Charge Pump Under Voltage Fault

iDriveNHS

iDrive N HS Setting

iDrivePHS

iDrive P HS Setting

lock

Built In Lock Setting - Masked by Algo

iDrivePLS

iDrive P LS Setting

tDrive

tDrive Setting

cbc

Not Applicable for FOC FW / Not to be configured

Note: User would need to program the currentBase in the System parameters based on the CSA Gain configured in the gate driver.