https://e2e.ti.com/support/motor-drivers-group/motor-drivers/Products covered in this section are TI's DRV family of motor drivers. Learn more at www.ti.com/motorcontrol.en-USTelligent Community 13https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1680109/drv8343h-q1evm-bldc-output-is-dc-not-ac/6481432Fri, 11 Sep 2026 19:56:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:666616df-1a0b-45cf-9ae7-9935613054fdJesus Rodriguez ToscanoHello, Phillip, I talked to the team, and first I wouldn't decrease the shunt resistor value because we believe, it is likely what is currently protecting your circuit from being damaged again (Triggers a fault), as well as your 1.88V VDS limit. Your issue is likely not found in the schematic, but rather in your layout. It could be that the driver capacitors are located too far away from it leading to higher spiking and ringing which slows things down. It could be that your traces are too thin for the gates in the FETs. I won't know until I look at your layout. So, could you please provide the layout for your breakout board of DRV8343H, and of your general board (Make sure that it has the power stage)? Also, what is it that happens when the duty cycle of 25-50% is exceeded? Does it trigger a fault? Does the motor keep spinning until a stop? Does the motor get stuck? Thank you, Philliphttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681085/drv8353-drv8353s-question-about-gain-setting-for-shunt-amplifier/6481373Fri, 11 Sep 2026 18:45:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:04fd0ee8-5e01-4735-b95b-d1acdf746797Jesus Rodriguez ToscanoHello, Austin, It is in theory possible to decrease the gain of the circuit by adding the same external resistors in series at SPx and SNx. However, this hasn't been tested, so it isn't for sure that this will work. Though, it is also possible to modify the resistance of the shunt resistor and modify the voltage of Vref to gain higher resolution and range. A lower resistance and/or gain lead to higher measurable range of current, but reduced resolution. While higher resistance and/or gain lead to higher resolution but reduced measurable range of current. Additionally, increasing Vref can also increase the range of resolution, so if the customer wants to increase the range that is another possible solution. Sincerely, Jesus Rodriguezhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1678733/drv11873-leakage-current-from-rd-fg-to-vcc/6481289Fri, 11 Sep 2026 17:31:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:8c2da917-f03e-43e8-ae3f-13e1f0567cf2Venkatadri Shantaram84961Hi, Sure , thank you! I will verify the provided details and get back to you. Thanks and best regards, Venkatadri Shttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681394/mct8316z-drvoff-and-pwm/6481275Fri, 11 Sep 2026 17:19:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:b3da53be-6689-4033-836e-5e81604001a8Venkatadri Shantaram84961Hi DRVOFF is independent, it can enable or disable MOSFETs based on the DRVOFF state. What is the PWM duty when DRVOFF is high? Thanks and best regards, Venkatadri Shttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681398/mcf8315d-using-a-constant-high-on-speed-pin-to-wake-from-sleep/6481263Fri, 11 Sep 2026 17:07:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:bb36d5f6-1951-47b5-986c-da410ba0a29eVenkatadri Shantaram84961Hi Max, A high signal on the speed pin will always wake the device from sleep, whether using PWM or analog. I am sharing the sleep entry/exit conditions from the datasheet below; please let me know if this clarifies things Thanks and best regards, Venkatadri Shttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1678150/drv8263h-q1evm-drv8263h-qevm-itrip-regulation-mismatch-and-gui-current-sensing-missing/6481246Fri, 11 Sep 2026 16:55:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:40880e54-4ec7-43dd-8abd-8a1b446bebbeXIAOCHANG PEIHi Joshua, thanks for your explanation. Our load is TEC Peltier cooler. We agree that our current measurement tool is not actuate enough for PWM powered current. After switching to AC current meter the reading is getting closer to the expected.https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1680477/mcf8329hsevm-mcf8329hsevm-not-detected-by-motor-studio/6481211Fri, 11 Sep 2026 16:32:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7136ff74-7ca0-4323-aeac-db45160c0b6fMichael ZarlingHello Dhinesh, My EVM is working. I was assuming that the board would be detected by Motor Studio with only the USB connected to my PC. I was trying to be safe by not turning on motor power while I was initially working in Motor Studio. Everything started working when I turned on motor power. Sorry to take up your time on this. Regards, Michaelhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1680996/drv3946-q1-how-to-set-value-of-register-chx_pt-of-drv3946/6481187Fri, 11 Sep 2026 16:15:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:3483abd0-ee95-404d-9583-322109cbc805David MedisHello, With this formula you will enter the register value in decimal form. Best, Davidhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681608/drv8343-q1-looking-to-get-an-fae-for-our-companyFri, 11 Sep 2026 16:09:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:bef3eece-9a9c-4b85-aab7-45c4c2ee390cMatt TaylorPart Number: DRV8343-Q1 Hey! I used to work at Nuro and Tesla and lost my FAE contacts. I'm currently supporting Chip (chipmotors.com) who are beginning custom PCBA design. Would be awesome to get an FAE assigned. Thanks. Matt.Chassis control & safetyDRV8343-Q1https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1680508/drv3901-q1-drv3901-miso-always-high/6480997Fri, 11 Sep 2026 13:46:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7f6309d8-c98d-4112-a74e-3dac73a0d967Dharshan RameshHello Ibinu, Thank you for you response. I verified the pull-up resistor connected from the NAD/nFAULT pin to VDD. The physically fitted resistor is 5.6 kOhm. Initially, I configured the software SPI header with NAD address 00, but the device did not respond. I later changed the NAD address bits in the SPI header to 10, corresponding to the 27 kOhm NAD configuration, and communication had initiated. STATUS0 read MOSI: 0x83 0x00 0x00 MISO: 0xC1 0x9F 0x02 The STATUS0 register value was 0x9F02, and bits 15 and 14 indicated NAD 10. I was also able to read STATUS1 and complete the configuration CRC successfully. I did not need to issue the reinit NAD command. After issuing CLR_FAULT, the nFAULT pin was high. Could you please help clarify why the device detects and responds to NAD 10 when the measured pull-up resistor is 5.6 kOhm?https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681333/drv8462-are-m1-and-m0-pins-possible-to-be-changed-while-the-motor-is-operating/6480980Fri, 11 Sep 2026 13:35:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7d53c16d-b735-4cd5-ba8a-6c13bd0918d6Murugavel4637Hi Inoue-san, [quote userid="119143" url="~/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681333/drv8462-are-m1-and-m0-pins-possible-to-be-changed-while-the-motor-is-operating"]Could you please advise if changing the settings of the "M0" and "M1" pins while the motor is in operation—in order to switch the microstepping mode—might result in malfunctions or unintended behavior?[/quote] M0 and M1 can be changed while the stepper is in operation and running. The new mode will become effective at the immediate rising edge of the STEP input after the microstep mode change was made. [quote userid="119143" url="~/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681333/drv8462-are-m1-and-m0-pins-possible-to-be-changed-while-the-motor-is-operating"]Additionally, please let us know if it is acceptable to change the settings for the "DECAY0," "DECAY1," and "TOFF" pins while the motor is running.[/quote] The DECAY0,1 and TOFF control accept changes while the motor is running - it is okay to change them and they take effect immediately after the change. But, why is this change needed? Typically these are one time setting for a stepper motor. Thank you. Regards, Murugavelhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681506/drv8376evm-drv8376evm-has-no-output/6480803Fri, 11 Sep 2026 10:42:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:952d76b9-161b-470f-840a-c2794f348370Balazs FarkasHi Rajesh, Thank you for the quick reply. The EVM's datasheet does not specify it anywhere, so I wonder, would your official EVM+GUI setup generate any signal output without Hall sensors attached? The chip itself can drive sensorless FOC after all.https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681506/drv8376evm-drv8376evm-has-no-output/6480780Fri, 11 Sep 2026 10:12:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:33c0ea69-8f70-4fdd-8dd3-38969bd054f0Rajesh ChauhanSince your GUI connects fine, VM reads 12V, LEDs are green, and no faults are reported, the issue is likely in one of a few specific areas. Please work through these in order: 1. Check the DRVOFF Pin (Most Likely Cause) The DRVOFF signal (J8 Pin 5, mapped to GPIO39 on the LaunchXL-F280049C) is active-high — if it is HIGH, the gate drivers are completely disabled and no PWM will appear at the outputs, regardless of what the GUI shows 1 . Action: Probe J8 Pin 5 with your oscilloscope. It must be LOW for the outputs to be enabled. If it's stuck HIGH, the GUI firmware may not be driving GPIO39 correctly. 2. Verify Your 4 Resistor Pads Are Correct You mentioned bridging 4 resistor pads. For the H-version, the configuration resistors R53–R60 set PWM mode, slew rate, gain, and OCP. Critically, SPI-variant and MCx-variant resistors must be unpopulated (DNP) — if any of those are populated, the device will not configure correctly for PWM operation Confirm which 4 pads you bridged against this table: If the PWM mode resistor is missing or wrong, the device won't know how to interpret the INHx/INLx signals, and outputs will stay low. 3. Probe the PWM Input Pins at J8 Verify that the LaunchPad is actually generating PWM signals. Probe these pins on the J8 header with your oscilloscope INHA — J8 Pin 20 (GPIO10/PWM6A) INLA — J8 Pin 18 (GPIO11/PWM6B) INHB — J8 Pin 16 (GPIO8/PWM5A) INLB — J8 Pin 14 (GPIO9/PWM5B) INHC — J8 Pin 12 (GPIO4/PWM3A) INLC — J8 Pin 10 (GPIO5/PWM3B) If these are also LOW, the problem is on the MCU/firmware side — the GUI may not be properly commanding the ePWM modules. 4. Additional Checks Clear Faults: Even if no faults are displayed, press "Clear Faults" in the GUI before enabling output 1 . AVDD/GVDD LEDs: Confirm both are green — not just VM PWM frequency: Ensure the GUI is not commanding a frequency above 100 kHz, which the DRV8376 cannot handle Regards, Rajeshhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681510/drv3946-q1-details-of-how-active-hs-clamp-ls-clamp-works/6480771Fri, 11 Sep 2026 10:01:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:9534b017-6d7f-4631-965c-0aa576e574f3Marc LiuLink of related questions: https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1618094/drv3946-q1-technical-questions-and-document-request/6240853?tisearch=e2e-sitesearch&keymatch=drv3946%252525252520active%252525252520hs%252525252520clamp#https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681510/drv3946-q1-details-of-how-active-hs-clamp-ls-clamp-worksFri, 11 Sep 2026 10:00:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7cea94f1-5ad2-49fd-aa31-144a4da7cee0Marc LiuPart Number: DRV3946-Q1 Hi Team, I'd like to know more about how active HS clamp & LS clamp works. I found one related link but the picture is not that clear and need more explaination. Do you have more details? Thank you! MarcChassis control & safetyDRV3946-Q1https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681506/drv8376evm-drv8376evm-has-no-outputFri, 11 Sep 2026 09:54:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:d32fffec-f180-43b3-b84b-72d012c6cfe9Balazs FarkasPart Number: DRV8376EVM Other Parts Discussed in Thread: LAUNCHXL-F280049C , DRV8376 Hello, I am attempting to drive a maxon 200189 motor with the DRV8376EVM board, H version of the driver chip. I have followed the instructions and configured the board for my application (bridged 4 resistor pads, and put two jumpers on the Ilimit and Vref selectors) and then attached it to a LaunchXL-F280049C. I have managed to connect the setup through to the browser GUI, I have a readout on Vm (12V), I can put the evm to sleep and everything is, in general, in the green. No errors, no faults. Yet, when I enable the output and put a duty cycle on the driver, there is no drive signal coming out of the board. It stays low. This is confirmed using an oscilloscope as well. Can you please advise me on how to proceed? Thank you and best regardsDRV8376EVMLAUNCHXL-F280049CDRV8376Aerospace & Defensehttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1680109/drv8343h-q1evm-bldc-output-is-dc-not-ac/6480544Fri, 11 Sep 2026 06:37:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:5ca790ba-ffed-43b1-b694-a6296035568bPhillip BothmaI tried the motor with the BLD-530S - motor runs max RPM both directions. I tried the DRV8343HPHPRQ1 but swapped A and C and the driver chip itself blew (internally shorted). I am not having the best of luck here.https://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681398/mcf8315d-using-a-constant-high-on-speed-pin-to-wake-from-sleepFri, 11 Sep 2026 06:30:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:87d5ba1a-189c-4e10-915e-7e2d95007f37Max AbildgaardPart Number: MCF8315D Hi, a quick question, to clear some doubt: Use-Case: I am designing a board, where I use several MCF8315D units. These are controlled in PWM mode and they will be configured to enter SLEEP when not in use. Use-case requires that the MCF8315D again wakes from sleep when a constant HIGH (equivalent to 100% PWM) is received on the SPEED pin. Question: I know that a constant HIGH is disregarded as speed-input, and so the motor will not spin (a wise safety feature indeed). I just wanted to verify that this doesn't happen in terms of waking from SLEEP? Can you verify that the MCF8315D indeed wakes from SLEEP when a constant HIGH is applied to the SPEED pin? Best MaxMCF8315Dhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1681394/mct8316z-drvoff-and-pwmFri, 11 Sep 2026 06:15:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:7db5f852-d155-4fe0-8706-231fc1eed1c9Tahir MahmoodPart Number: MCT8316Z Which signal must be applied first, DRVOFF or PWM? I see that when I enable the driver first and then apply PWM signal I get the fault. Only when I apply WPM first and then enable the driver, it works other I get fault. Similarly to stop the motor, if I remove the PWM signal first i get the fault. It works only if I disable the driver with DRVOFF first, keeping the PWM on. What is recommended way to start and stop with DRVOFF and PWM. I am using the hardware option not SPI.Medical & healthcareMCT8316Zhttps://e2e.ti.com/support/motor-drivers-group/motor-drivers/f/motor-drivers-forum/1678733/drv11873-leakage-current-from-rd-fg-to-vcc/6480508Fri, 11 Sep 2026 06:09:00 GMTcb01d8b2-d089-468d-babb-77d1d8683490:10ccb11b-5bc4-46aa-a9b1-1f7272c0bffbFilippo GrazianiOk, Let me know if you need any more information.