Motor drivers forum - Recent Threads

MCF8329A: Communicating with MCF8329A through I2C

Prahaladh S — Tue, 04 Aug 2026 13:20:46 GMT

Part Number: MCF8329A

Hi,

Greetings...

We're using MKE17Z512VLH9 to drive MCF8329A to drive 57ZWX01 BLDC motor (24V, 8 poles, 3 phases).

We're communicating from MCU to MCF8329A through I2C with an address of 0x01.

We're getting NACK when we probe the SCL & SDA pins.

In MKE17Z512VLH9, the Vcc is given as 5V & the SCL & SDA lines are pulled up to 5V with 4.7k ohms.

We're giving 5V to VREG pin, getting 3.3V from AVDD & 1.5V from DVDD in MCF8329A.

Kindly let me know what could be the possible reasons for the NACK in the I2C.

Please guide us in this regard.

Warm Regards,

Prahaladh S

DRV8874: Technical Support Required: Driver IC DRV8874PWPR Output Issue

Pavan P S — Tue, 04 Aug 2026 05:27:31 GMT

Part Number: DRV8874

We are currently using the DRV8874PWPR driver IC to drive 7 individual MBV units per HVBMS (High Voltage Battery Management System) board.

During our End-of-Line (EOL) testing of a freshly assembled batch of PCBs, we discovered that all 7 driver units on a single board are failing to operate properly, exhibiting the exact same behavior described below.

1.No-Load Condition:

The output voltage successfully builds up to the target 24V.

2.1A & 330mA Resistive Load Condition:

The IC enters a fixed-OFF time mode, cutting the output for 24 µs.

Key Notes from Waveform Analysis:
nFAULT Pin: Stays high (not pulled down), indicating the IC is entering fixed-OFF time mode without triggering an official protection fault..
Waveform Color Guide:
Red: Output Current
Green: Voltage at IPROP Pin
Blue: Output Voltage
Yellow: nFAULT Pin Voltage

Also Request you to find our schematic snap shot for the reference.

Awaiting for your response.

Thank you

DRV826X-Q1-JUNCTION-TEMPERATURE-CALC: DRV8262QDDWRQ1 PSPICE MODEL

?? ? — Tue, 04 Aug 2026 03:31:43 GMT

Part Number: DRV826X-Q1-JUNCTION-TEMPERATURE-CALC

When will TI release the PSPICE model of DRV8262QDDWRQ1 on their official website? Or are there any other models that can be used as alternatives?

LMD18200: OCP Delay During Initial Power-Up with Shorted Output

ArTzy — Mon, 03 Aug 2026 20:56:13 GMT

Part Number: LMD18200

Hi Experts,

We'd like to ask assistance/clarification about LMD18200:

We accidentally powered up the device with a shorted output load. The supply voltage ramped up in 10µs. We noticed that the very first overcurrent protection (OCP) trigger took about 4–5ms to activate. After this initial event, the IC entered its standard repetitive cycle, turning on and shutting down every 8µs.

Does the LMD18200 experience an inherent delay or a slower top-side MOSFET gate-drive turn-on time specifically during the initial power-on state?

Thank you.

Regards,
Archie A.

DRV3245Q-Q1: development questions

Eileen Hu — Mon, 03 Aug 2026 09:14:37 GMT

Part Number: DRV3245Q-Q1

Hi team,

My customer has some questions during their DRV3245AQ development. Could you please help to answer it? Thank you.

1. Is there a power-on sequencing requirement? For example, between VREF/VDDIO/PVDD/VDRAIN?

2. During sleep mode, if VDRAIN is powered while other input pins (PVDD/VDDIO/VREF) are unpowered. Is this a problem?

3. What package size is required for the 100ohm series resistor on VDRAIN?

4. What is the purpose of the three-phase PVDD/A/B/C SENSE ADC sampling? Is it mandatory?

5. For the logic input ports, the recommended maximum operating level is 5V. The MCU is powered at 5V — is there a risk? Is it acceptable as long as the logic input level does not exceed 5.5V?

6. For the three current sensing channels, can one channel be used to sense the bus current while the other two sense two phase currents?

7. Can the gate drive capability support external MOSFET? How to select it?

8. The SP/SN connection differs between the reference schematic and the reference PCB layout, the two in inverted on the schematic. Which is correct?

9. After disabling DRVOFF/EN, besides PVDD leakage, does VDRAIN have leakage current? How much?

Regards,

Eileen

MCF8329A: MCF8329A Initialization and Configuration Sequence for I²C and PWM Speed Control with MKE17Z512

Hasim khan — Mon, 03 Aug 2026 07:48:46 GMT

Part Number: MCF8329A
Other Parts Discussed in Thread: MOTORSTUDIO

Hi TI Team,

I am using the MCF8329A with an NXP MKE17Z512 MCU and would like to control the motor speed using both supported methods:

Demo 1: I²C Speed Control

I would like an example showing:

Device wake-up sequence.
I²C initialization.
Required register configuration.
Motor parameter initialization.
Motor start command.
Speed command update through I²C.
Direction and brake control.
Demo 2: PWM Speed Control

I would like an example showing:
1. Required MCF8329A register configuration for PWM mode.
2. Initialization sequence after power-up.
3. SPEED/WAKE pin usage.
4. PWM frequency and duty-cycle requirements.
5. Motor start sequence.
6. Direction and brake control.
7. Any required EEPROM programming steps.
  Request
  
  I am having difficulty understanding the correct initialization and configuration sequence from the datasheet. Specifically, I am unable to determine:
  - Which registers must be configured first.
  - Which settings must be stored in EEPROM.
  - The correct power-up sequence.
  - The minimum register configuration required to run a motor.
  - The recommended sequence for switching between PWM-control mode and I²C-control mode.
  Could TI provide:
  - Example register settings.
  - Initialization flowchart.
  - Sample firmware snippets (pseudo code or C code).
  - Reference example for MKE17Z512 or any generic MCU.
  Thank you for your support.

DRV8244S-Q1LEVM: Fail to connect DRV8244S-Q1EVM board by DRV824x_DRV814x-Q1EVM-GUI

Jakeen — Mon, 03 Aug 2026 03:52:54 GMT

Part Number: DRV8244S-Q1LEVM

Hello TI expect,

I try to connect DRV8244S-Q1EVM board by DRV824x_DRV814x-Q1EVM-GUI tool. Anyway, it's always stuck as below once I click connect icon.

I'm not sure if below driver package must be installed firstly. I haven't installed this driver as I don't have administrative privilege for now.

DRV8353RH-EVM: Potential Inconsistency with DRV8353RH Datasheet, Question on Recommended IDRIVE

Daniel McDonald — Fri, 31 Jul 2026 23:07:24 GMT

Part Number: DRV8353RH-EVM

Hello,

I recently purchased the DRV8353RH-EVM board and have been testing it in 1x PWM mode. I made the modifications to the configuration resistors, including removing R23, R26 and R31 to configure the driver to be in 1x PWM mode and increase the gate driver current and Vds limit. I used the eval board in this configuration up to 10% duty cycle on the 20 kHz input PWM signal at which point the fault light was firmly on. I believe the Vds limit was being reached, and the H-bridge MOSFETs where very hot to the touch. At this point the average current draw was only 1.5 A.

I then populated R27 with a 0R jumper resistor in order to disabled the peak current limit to drive the gates harder and see how it performed. Perhaps this was a bad idea, but upon powering the board back up I couldn't get it to work at all; I was unable to drive the ENABLE input high (pulling more current than my 74HCT04 inverter gate could drive) and engage the motor driver.

After troubleshooting my board that was driving the ENABLE signal, I eventually returned to the eval board and discovered that DVDD (pin 40) was at 0 V, even though VM and VDRAIN were at 12V and 28V respectively. Unpowered resistance measurements showed that DVDD was shorted to ground (5 Ohms). I removed decoupling capacitor C32 and verified DVDD was still shorted to ground.

Digging around a little and reading the DRV8353RH datasheet, it seems all the configuration pins are supposed to be tied either to AGND or DVDD, while the DRV8353RH eval board ties them to the external 3.3V rail (powered by the LDO off the 12V buck regulator output). From what I can tell, this is inconsistent with the datasheet and seems to have created an internal short between DVDD and AGND, bricking the IC and my eval board.

So after all that background, I have two questions:

Can someone confirm if the DRV8353RH-EVM configuration resistors are connected in error to 3.3V? I couldn't find this info on the forum already and wanted to share my experience in-case it is an error so it can be resolved.
Are there recommended maximum IDRIVE or VDS limits for the eval board that would help avoid VDS OVP triggering and reduce MOSFET heating? TCSD19532Q5B MOSFETs are used in the half-bridges, but I'm not sure how to estimate how hard they can/should be driven.

Let me know if there is anything I can clarify. The schematic provided in the design files for the DRV8353RH-EVM is copied below for reference. Thank you in advanced for any responses!

DRV8874: Why did the VM and VCP pins of DRV8874 get damaged during the power-on transient?

Guijiao Zeng — Fri, 31 Jul 2026 11:32:18 GMT

Part Number: DRV8874

Hi,

I have already started mass production. Now we have found that in three cases, the DRV8874 starts to smoke and get damaged as soon as it is powered on.

The VM and VCP pins of the chip have been short-circuited to ground, while the other pins are normal, and the peripheral components of the chip are also normal.

See PIC1

Because three such failures occurred randomly, and the chips were already damaged during the startup process, I tested the transient waveforms during startup.

See PIC2

Furthermore, I would like to provide the following additional information.

See PIC3~5

24V_IN is provided by the medical power adapter.

When testing the current, remove fuse F3, solder the wire, and use the clamp-type current probe for testing.

My question:

Does this kind of power-on transient fault phenomenon, which only causes damage to the VM and VCP pins, result from inappropriate nSleep timing, or is it caused by some other reason?

That's all. Thanks for your reply.

DRV8353R: Regarding SEV_LVL

Daisuke Higa — Fri, 31 Jul 2026 09:14:18 GMT

Part Number: DRV8353R

Hi support team.all.

I would like to know the variation values for each of the four thresholds of SEN_LVL.

Could you please provide information on these Min/Max values?

Best regards,

DRV8353R: Automotive Standard (AEC-Q100)

Pratik Potdar — Fri, 31 Jul 2026 08:25:33 GMT

Part Number: DRV8353R
Other Parts Discussed in Thread: DRV8363-Q1

Does the DRV8353RS gate driver meet the AEC-Q100 automotive reliability standard?

DRV8334-Q1: DRV8334-Q1: VDRAIN Voltage Remaining After PVDD Is Turned Off

tomohiro mitou — Fri, 31 Jul 2026 02:04:07 GMT

Part Number: DRV8334-Q1

Inquiry

Dear Texas Instruments Technical Support Team,

We are designing a three-phase inverter using the DRV8334-Q1 and would like to confirm the acceptable power-supply conditions and power-down sequence when PVDD and VDRAIN are supplied from separate batteries.

Circuit Configuration

Device: DRV8334-Q1
PVDD and VDRAIN are supplied from two separate 12 V batteries.
The grounds of the two batteries are connected together.
PVDD supplies power to the DRV8334-Q1.
VDRAIN is connected to the motor power supply of the inverter.
An approximately 13 mF DC-link capacitor is connected to the VDRAIN-side power rail.
No bleeder resistor or active discharge circuit is currently connected to the DC-link capacitor.
Therefore, after PVDD decreases to 0 V during system shutdown, voltage may remain at VDRAIN for an extended period due to the charge stored in the DC-link capacitor.

Intended Power-Down Sequence

Stop the PWM inputs.
Set ENABLE_DRV = 0.
Set DRVOFF High.
Turn off the VDRAIN power supply.
After completion of the gate-driver shutdown sequence, turn off the PVDD power supply.
PVDD decreases to 0 V, while the DC-link voltage remains at VDRAIN.

Under this condition, PVDD remains at 0 V while VDRAIN remains at approximately 12 V up to the maximum battery voltage, with a common ground.

Questions

Is it acceptable for voltage to remain applied only to VDRAIN while PVDD is at 0 V?
If this condition continues for an extended period, could it cause any damage, reliability degradation, or unintended internal operation of the DRV8334-Q1?
Could current flow or backfeed from VDRAIN into PVDD, GVDD, VCP, BSTx, the logic supply, or any other internal node? If so, could you please provide the maximum possible current or the relevant internal equivalent circuit?
The Recommended Operating Conditions section of the datasheet specifies a VDRAIN range of 0 V to 60 V under the “Limited functionality” condition. Does this specification also cover the condition where PVDD = 0 V and VDRAIN > 0 V?
When PVDD and VDRAIN are supplied from separate power sources, does TI recommend a specific power-up or power-down sequence? Are there any restrictions regarding the maximum voltage difference between PVDD and VDRAIN, the order of their rise and fall, or the allowable duration of this condition?

We would particularly like to confirm whether the following condition is acceptable and guaranteed for the device:

PVDD = 0 V
VDRAIN = approximately 12 V up to the maximum battery voltage
Common ground
Duration: indefinitely, or until the DC-link capacitor discharges naturally
PWM inputs stopped
ENABLE_DRV = 0
DRVOFF = High
VDRAIN voltage remains applied to the drains of the external MOSFETs

Thank you for your support.

DRV8376: The Fault pin is low

Zhang Liang — Thu, 30 Jul 2026 12:30:32 GMT

Part Number: DRV8376

Hi,

Please help to check our schematic diagram that the Fault pin is enable to low when power on, thanks.

DRV8376_260730.pdf

DRV8718-Q1: Questions regarding the clear fault

Manu Chang — Thu, 30 Jul 2026 10:52:32 GMT

Part Number: DRV8718-Q1

Hi expert,

2 questions regrading the clear fault as below for DRV8718-Q1

When setting to the latch mode, will the CLR_FLT command reset the NFLT pin as well and put the NFLT pin to high again after the CLF_FLT bit asserted?
When setting to the cycle by cycle mode, even though the CLR_FLT is issued, the device still need next PWM (HW version) or SPI command to toggle the on and off (SPI) version to clear and reset the nFLT to high again?

BR,

Manu

DRV8706-Q1: DRV8706H-Q1: Two devices failed after abrupt PWM stop driving a brushed DC motor, GH2-SH2 short and internal regulator short

James Goss — Thu, 30 Jul 2026 03:08:00 GMT

Part Number: DRV8706-Q1

Hi,

I'm seeing repeated failures of the DRV8706HQRHBRQ1 on a 12 V brushed-DC actuator board. Both failures occurred during motor operation rather than at power-up or connection, and in both cases all four bridge MOSFETs survived, only the gate driver was damaged. I'm trying to narrow down the likely stress entry point before we respin.

Application

Single H-bridge driving a brushed DC motor
12 V bench supply, 3 A current limit. The supply cannot sink current.
PWM at 20 kHz
MODE = Level 3 (PWM H-bridge control), set with a 510 k ohm pulldown to GND
Normal operation: PWM on IN1 with IN2 held high, so IN1 high puts the bridge into low-side active freewheel (brake). IN2 becomes the PWM input when reversing direction.
Bridge FETs: 4 x Infineon BSC007N04LS6 (40 V, 0.75 m ohm, SuperSO8)
Motor leads approximately 20 cm
H-bridge ground and logic ground are shared, as this is a 12 V-only application
No gate resistors or gate-source pulldowns on the bridge, following the reference design
Measured MOSFET switching transition time is approximately 1 µs

Layout

4-layer stackup: signal / ground / power / signal
2 × 4.7 µF ceramic directly at each half-bridge (4 total)
3 × 330 µF hybrid caps approximately 30 mm from the H-bridge
Solid ground plane under all signals
Short gate traces

Failure

2 of 2 boards built have had the gate driver fail.
Board 1: internal short from DVDD (3.3 V) to GND. All other board functions were fine once the gate driver was removed.
Board 2: short between GH2 and SH2, with nFAULT permanently asserted. No other board functions were affected even with the gate driver still fitted.
All four MOSFETs survived both failures, and no other components on either board seem to be damaged.
Both failures followed a sudden stop of the motor, a single-step change from 50% duty to all gates low.
I have since confirmed on the scope that at this stop event all four gate outputs go low simultaneously, i.e. the bridge enters diode freewheel (coast) with motor current still flowing.
Applying a rate limit to the duty-cycle change seems to eliminate the failure entirely. Ramping the duty down, the driver survives, I believe opening all 4 fets is what kills it.
Everything on the high-voltage path is rated to at least 35 V and the device PVDD abs max is 40 V. At 12 V into a 3 A limit I've seen no evidence of a rail overvoltage event.

Questions

Is a GH-to-SH short a known signature for sustained negative voltage on SHx? Given the MOSFETs are intact, I'd like to distinguish gate-output damage from something propagating in from the switch node.
What is the recommended way to keep SHx within its −2 V DC rating during extended body-diode conduction? Is a Schottky from each switch node to GND the preferred approach, or is there a better method?
Board 1 failed with a DVDD-to-GND short rather than gate-domain damage, from what appears to be the same event. Is secondary damage in an unrelated domain a recognised consequence of substrate injection from a negative pin excursion on this part?
For an inductive load in MODE Level 3, what is the recommended sequence for an immediate stop? This is a safety actuator, so in a fault scenario the motor must stop without a firmware ramp, and the same abrupt release will occur on watchdog reset, brownout, or DRVOFF assertion. Is commanding low-side active freewheel (IN1 = IN2 = 1) preferable to coast, and how does the device sequence the gate outputs when DRVOFF is asserted with current flowing?

Schematics for the gate driver, power stage, microcontroller and power protection are attached, along with the gate driver and power stage layout.

Thanks for your help,
- James Goss

LMGXX-GAN-LLC-CALC: LMG3100R017VBER simulation models

Albert Barroso — Wed, 29 Jul 2026 21:13:02 GMT

Part Number: LMGXX-GAN-LLC-CALC

1) Can I get a simulation model for the GaN MOSFET power stage LMG3100R017VBER PSIM or a datasheet that I can parameterize in PSIM to simulate it ?

2) What is the tool you reccomend using to simulate the LMG3100R017VBER in a 3-phase SVPWM FOC inverter ?

3) Our 3-phase inverter needs to deliver 2100W of power to a brushless motor, and 6 LMG3100R017VBER are going to be liquid cooled with a fast 65C moving fluid. Do you think our inverter is in its SOA or we are abusing it ?

4) Is TI developing a LMG3100R008VBER with a 0.8 milliohm Rds_on ?

onsemi released a 100V 0.8 milliohm Rds_on GaN MOSFET but needs an external gate driver.

NTLEF1D0N10GN1 - Enhancement Mode Gallium Nitride (GaN) HEMT 100 V, 0.8 mOhm, TBD A, PDSO‐N8

DRV3946-Q1EVM: DRV3946-Q1EVM: Schematic request

Shivam Gupta — Wed, 29 Jul 2026 10:28:36 GMT

Part Number: DRV3946-Q1EVM

Hi team ,

kindly provide the schematic for DRV3946-Q1EVM.

DRV8871-Q1: The pins of the DRV8871DDARQ1 chip have been found to have problems such as copper leakage and discoloration. Produced in batch in the 29th week of 2025

JIM CHEN — Wed, 29 Jul 2026 08:02:13 GMT

Part Number: DRV8871-Q1

Hello, I'm very sorry to disturb you. Regarding the material "DRV8871DDARQ1" with a humidity and temperature rating of MSL3, the vacuum bag is not leaking. The production year cycle is 2025, with 29 weeks of production. However, when our quality control department removed the vacuum bag and photographed the chip's silk-screen marking for archiving, they found that the bottom pins showed signs of copper leakage and discoloration. I would like to confirm with you whether this is a normal phenomenon that does not affect usage? Because the vacuum bag has not been opened since the factory and there has been no leakage, we are wondering how this problem could occur. This project is quite urgent because the copper leakage and discoloration issue has halted the entire project. I hope you can reply as soon as possible. Thank you very much. Please refer to the example picture for the detailed situation. (Is this because the new process of your company roughened the lead frame, causing various process problems with the pins?)

DRV8837: Suitable motor driver

YgorPBrand — Wed, 29 Jul 2026 07:24:41 GMT

Part Number: DRV8837
Other Parts Discussed in Thread: DRV8212P, , DRV8218, DRV8212

Hi all,

I am currently working with a motor driver for a low-power application. The input supply voltage range is 1.8 V to 3.8 V, although the minimum voltage can be increased above 1.8 V if we enable a DC/DC boost converter.

As this is a battery-powered application, low quiescent current and low leakage current are key requirements, with lower values being preferred.

In the previous design, we used the DRV8837DSGR with a maximum current of 1A.

Could you please recommend suitable motor driver ICs for this application?

Thank you in advance for your support.

DRV8320R: DRV8320R 3% test fail

Luke Chiang — Wed, 29 Jul 2026 03:45:53 GMT

Part Number: DRV8320R

Subject: Failure Analysis Report for DRV8320RHRHAR (3% Failure Rate)

Test Type: Functional Testing

Test Results Overview:
The initial tests yielded both PASS and FAIL results among the samples. Upon repeating the tests, the FAIL condition was reproduced consistently.

Observation:
According to the above tests, the defective units no longer output the corresponding waveform. The repeated test results confirm that this failure is not an isolated or accidental event.

Preliminary Conclusion:
We believe that the defective products have suffered irreversible damage.

Request for Technical Support:
We urgently need to identify the possible root cause of this failure event to perform a self-check on our circuit. Could you please provide the following information:

What are the potential reasons for this adverse phenomenon?
Have similar models experienced similar phenomena before?
Based on your previous analyses, what are the suspected causes for this type of failure?

Please assist us in identifying the root cause and potential failure directions so that we may take corrective action.

DRV8353R: The schematic review for DRV8353RH

Zhang Liang — Tue, 28 Jul 2026 18:52:43 GMT

Part Number: DRV8353R

Hi,

Please check our schematic diagram for DRV8353RH, we test the current of the V-phase and it is small than the UW,

the current is about 4/5 of the UW, please advise how to solve this issue, thanks.

mz-2501-drv-30-va01-20260722-fz1.pdf

DRV8461: Default state of units shipped from ti

THOMAS Hart — Tue, 28 Jul 2026 17:43:15 GMT

Part Number: DRV8461

I would like to know the default state of new product.
Is there a version of the EVM with a socket so that I caould program them before Surface mount assembly? If not, is there any reason why I couldn't attach a fixture to the EVM for programming?
Is source code available for the EVM that I could use to shortcut development of my own software for modifying the setup, creating diagnostics, etc.?

DRV8343S-Q1EVM: SLEEPn Register reset

David Guest1 — Tue, 28 Jul 2026 17:11:08 GMT

Part Number: DRV8343S-Q1EVM

can the SLEEPn pin bre used as a register reset. Basically to reset the chip without power cycling if something has gone wrong internally.

Some data imples not, it only clears FAULT register /conditions and shuts down internal analog blocks.

Whilst an AI claims if held for longer than 40uS it resets all registers.

Whats the truth :)

MSPM0G3107: LIN Responder - Polling based code required

Desingh Raj Mani — Tue, 28 Jul 2026 13:59:01 GMT

Part Number: MSPM0G3107
Other Parts Discussed in Thread: SYSCONFIG

Hi,

Right now from SDK I can see that there is LIN Responder which is totally Interrupt based.

We are creating multiple application modules and we need to align with while loop or LIN communication in Polling method in order to have a time sync.

We have 5 Application modules and use 32 Mhz Internal oscillator as per Sysconfig and we need 5 tasks based on the TIMER module.

Requesting you to provide a Polling based LIN Communication Code.

DRV10983: Unable to open application

RAM RAJAGOPAL — Tue, 28 Jul 2026 10:41:47 GMT

Part Number: DRV10983

While attempting to open the .drv file for the DRV10983 EVM, the application fails to launch and displays the following error:

"Unable to locate the LabVIEW Run-Time Engine. DRV109xx EVM requires a version 2014 (or compatible) LabVIEW Run-Time Engine."