Sensorless FOC - DRV8316 Gate Driver User Guide¶
This User Guide outlines the usage of DRV8316 gate driver along with the sensorless FOC Application running on MSPM0.
1. Hardware Required¶
LP-MSPM0G3507 - MSPM0G3507 Launchpad
DRV8316REVM - The DRV8316REVM provides three half-H-bridge integrated MOSFET drivers for driving a three-phase brushless DC (BLDC) motor with 8-A Peak current drive, for 12-V/24-V DC rails or battery powered applications.
DC Power supply that supports the required voltage and current
Brushless-DC Motor
Micro-USB cable
2. Hardware Setup¶
Remove the PA26 jumper J18 in the LP-MSPM0G3507 as shown below.
Connect the LP-MSPM0G3507 to the DRV8316REVM in one of two ways:
1 Plug the connectors J3 and J4 of the DRV8316REVM to the top of the connectors J3/J4 of the LP-MSPM0G3507. An Additional connection need to be made from ISENB in DRV8316REVM to the PA26 in 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 DRV8316REVM for the location of the signals.
Connection
MSPM0G3507
DRV8316REVM
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
PB12
nSCS
Bus voltage input
PA18
VSENVM
Phase A current input
PA24
ISENA
Phase B current input 1
PA26
ISENB
Phase B current input 2
PA17
ISENB
Phase C current input
PA16
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
PB6
DRVOFF
DRV Sleep
PB2
nSLEEP
Controller Fault Output
PB16
LED
Common Ground
GND
GND
Note: There are two Phase B current inputs used because we use simultaneous current sampling, Refer to ‘Enabling simultaneous current sampling’ in FOC Library Overview.
Remove the black jumper connector in HAL_PWR_SEL and VREF/ILIM, and make the red color connection as below shown using a jumper wire. This connection is to make the ADC reference as 3.3V.
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
DRV8316REVM
COMP A input
PA14
ISENA
COMP B input
PB26
ISENB
COMP C input
PB21
ISENC
Connect the 3 phases of the BLDC motor to A/B/C of connector J6 on the DRV8316REVM.
Connect the positive and negative of the power supply to VM and GND of the power connector terminal block.
Set the power supply to a motor voltage between 6V to 24V within the DRV8316R specifications and a 5-A current limit.
Connect a Micro-USB cable from the LP-MSPM0G3507 to the PC.
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 DRV8316.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 |
---|---|
csaGain |
Current Sense Amplifier (CSA) gain |
enASR |
Not Applicable for FOC FW / Not to be configured |
enAAR |
Not Applicable for FOC FW / Not to be configured |
IlimRecir |
Not Applicable for FOC FW/ Not to be configured |
bemfThr |
Not Applicable for FOC FW/ Not to be configured |
ocpMode |
OCP fault mode configuration |
ocpLvl |
Overcurrent Level Setting |
ocpRetry |
OCP Retry Time Settings |
cbcDeg |
Not Applicable for FOC FW/ Not to be configured |
ocpCBC |
Not Applicable for FOC FW/ Not to be configured |
drvOff |
Bit to turn off the Gate Driver |
otwRep |
Bit to turn on the OTW reporting |
ovpEn |
Overvoltage Enable Bit |
ovpSel |
Overvoltage Level Setting |
pwm100DutySel |
Not Applicable for FOC FW / Not to be configured |
disRR |
Not Applicable for FOC FW / Not to be configured |
halfRR |
Not Applicable for FOC FW / Not to be configured |
clrFLT |
Clears the Gate Driver Faults |
pwmMode |
Not Applicable for FOC FW / Not to be configured |
slewRate |
Not Applicable for FOC FW / Not to be configured |
gateDrvCfg2 configurations¶
Bit Field |
Bit Definition |
---|---|
minOnTime |
Not Applicable for FOC FW / Not to be configured |
buckDis |
Buck Disable Bit |
buckSel |
Buck Voltage Selection |
buckCl |
Buck Current Limit Setting |
buckPsDis |
Buck Power Sequencing Disable Bit |
buckSr |
Buck Slew Rate |
targetDelay |
Not Applicable for FOC FW / Not to be configured |
delayCompEn |
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.