Part Number: DRV8353R
Hello,
Just would like to double confirm if 1A_sourcing and 2A_sinking current are for each gate driver of GHx and GLx? Very thanks.
Regards
Brian
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DRV8353R: Gate Driving Current capability
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TIDA-010936: Suspected error in layout files - Rev E1
Part Number: TIDA-010936
I was browsing through the Gerber files and even though I am no expert, this section for / around U9 (Voltage Level Translator) looks odd. Please see the image with the circled area in question. Can anyone confirm that this is an error?
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DRV8308: CP fail
Part Number: DRV8308
Hi, all
We are working on the project using drv8308.
I'm testing the board I designed.
The motor works well, but reading the motor register confirms the CP fault.
1uf-25V capacitor between VCP (28) and VM (27)
Does changing the capacitor to 1uf-50V fix the problem?
I'd like to try changing that capacitor, but I don't have 1uf-50V.
When the VCP voltage is measured, 34.4V is measured.
Is there a way to fix the CP failure?
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DRV8329: CSAGAIN Setting
Part Number: DRV8329
hello,
I am using DRV8329 to spin 3 Ph BLDC motor on one of our Project. this is a key project we are working and has very high annual volume ( > 50k)
we are evaluating the possibility of using CSAGAIN and SO pin to read the current from Motor and have Connected CSAGAIN To GND to read max current. Peak current (motor phase) in my application could go up to 90A during startup at load.
I am getting good data on the SO Pin but the voltage does not match with gain mentioned in the datasheet.
with CSAGAIN to GND I calculated table in above image. below are scope captures of Motor Phase current peak value and SO pin voltage wrt GND. there is clear offset of 400mV to 800mv which is very high. see below captures for reference
Peak current at startup is 81A, according to table, SO Voltage should be close to 1.24V but i am seeing 1.92V here, some more images below during operation
Request you to provide some feedback on the discrepancy observed. Below is snapshot of DRV8329 section.
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MCF8315C-Q1: MCF8315C current measure value not equal to the configured value.
Part Number: MCF8315C-Q1
Other Parts Discussed in Thread: MCF8315C
Other Parts Discussed in Thread: MCF8315C
MCF8315C current measure value not equal to the configured value.
Hello, I used MCF8315C to control BLDC. I configure current by writting register, and measure it by oscilloscope。
But I find the measure value doesn't equal to the configured value, and they have a const rate. Why?
1) MOTOR_STARTUP1.ALIGN_OR_SLOW_CURRENT_ILIMIT
a. set value=250mA, measure value=164mA. 250/164=1.524.
b. set value=500mA, measure value=324mA. 500/324=1.543.
2) MOTOR_STARTUP2.OL_ILIMIT
a. set value=250mA, measure value=160mA. 250/160=1.5625.
b. set value=500mA, measure value=336mA. 500/336=1.602.
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DRV2605L: Auto calibration reporting false LRA failure
Part Number: DRV2605L
We are using 4 DRV2605Ls to drive 4 LRA motors in open loop mode. In final assembly, motors are located in a wrist band. This is why we would like to run a diagnostic routine to examine motors against short, open or stuck rotor situations.
Since DIAG_RESULT bit only works either in closed loop or calibration mode, we have decided to run auto calibration routine to examine motors. Auto cal params are fine tuned to get more accurate results.
If there is problem with motor, it always returns failure that is 100% reliable. However, in some cases, although motors are okay, auto cal reports failure through DIAG_RESULT bit. I could say 9% it returns false failures. We wanted to use other outputs to judge the result of the auto calibration procedure but found that it does not matter if result reported as failed, false failed, or passed, BEMF_GAIN, A_CAL_COMP, and A_CAL_BEMF register values are getting pretty much the same or very close values. The only way left is to run diagnostic multiple times to mark a motor as okay if auto cal passes at least one time in X amount of iterations.
So the question is: is there another way to diagnose motors? We are also open for any suggestions to diagnose LRA motors in open loop mode.
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DRV8889-Q1: Hold time timing diagram
Part Number: DRV8889-Q1
Hi,
The conditions of tH Hold time and tSU Setup time are both DIR to STEP rising, but the marked positions of their timing diagrams are different.
As indicated on the timing diagram, will the direction not change until the next STEP?
What is the correct timing diagram of DIR and STEP?
Thanks & best regards,
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ULC1001-DRV290XEVM: DRV2901DDVR OUTPUT VOLTAGE settings related
Part Number: ULC1001-DRV290XEVM
ULC1001-DRV290XEVM
The circuit diagram shown below is ULC1001-DRV290XEVM.
Is it possible to change 36PIN (OUT_A) of the DRV2901DDVR device to 140Vrms?
Please let me know if there is a way to change it ( DRV2901DDVR OUT_A --> 140Vrms)
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DRV8718-Q1: Overcurrent monitor deglitch time
Part Number: DRV8718-Q1
Hi Team,
On customer board, there is the inrush current issue of 40A and around 10ms due to their motor load. So they want to know how to make the overcurrent detection time longer than msec unit and how to protect FET damage by overcurrent under other conditions. Please check it and let me know.
Regards,
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MCT8329EVM: Power and Current readings in System Status 3
Part Number: MCT8329EVM
Hi TI Team,
I just have a quick question about the information provided in SYS_STATUS3, I am aware of having to divide DC_BATT_POW by 64 and DC_BUS_CURR by 256, my question is more related to whether the values given are just what is consumed by the IC or what is consumed by the entire EVM.
I apologize if this question is absolutely trivial.
Kind regards,
Simon Calvini
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DRV8845: DRV8845RHHR
Part Number: DRV8845
Hi,
We have used DRV8845RHHR in our project to drive stepper motor having following specifications.
1) No of phase - 2
2) Phase voltage - 6.6V
3) Phase current - 1A
4 ) Phase resistance - 6.6ohms
5) Size : NEMA 17
The applied voltage on VM1 and VM2 pins is 11.5V.
The VREFX reference voltage pins are connected to PWM outputs of microcontroller for which the VOH logic level is 3.3V.
We have used voltage divider ckt and adjusted VREF voltage of 1.47V on all VREFX pins.
All sense pins have 0.47 ohms 1 watt resistor to GND.
The maximum itrip calculated is ITRIPMax = VREF / (3 × RSENSE)
= 1.47/(3 x 0.47)
= 1.04A
The maximum power to stepper motor is 6.6W as mentioned in the above motor specifications.
How much PWM duty cycle should be set on Vrefx pins to limit the maximum power of 6.6W to motor with above stepper motor specifications?
Also provide calculations for the same.
Regards,
KIRAN SURVE
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DRV8714-Q1: DRV8714 driver MOS, test rise time of gate isn't meet calculating value（calculate Trise is 145ns，test Trise is 470ns）
Part Number: DRV8714-Q1
Hi TI
I use DRV8714 driver a MOS(parameter shows at below picture)，but the rise time of gate isn't meet calculation.
Qgd = 9nC，Vsupply=16VDC，IDRVP_x=1111b = 62 mA (2.3 mA)，Trise=Qgd / IDRVP_x=9nC / 62mA=145ns，but my test Trise is 470ns.
My requirement is decrease Trise as much as possible，is there any method？
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DRV8334EVM: Design files for the DRV8334EVM
Part Number: DRV8334EVM
Dear TI Team,
I was wondering whether it would be possible to obtain the design files for the DRV8334EVM?
Thank you very much.
Best,
Nikita
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DRV2700: Used to operate LCG Smart Glass
Part Number: DRV2700
Other Parts Discussed in Thread: DRV2667
Other Parts Discussed in Thread: DRV2667
Excuse my ignorance here as I am new to a lot of this. I had seen a video of TI using this to operate LCG Smart Glass and am looking for a similar situation but not sure I fully understand it. Most of what I have seen and what little I know it seems it is DC input. And I believe the Piazzo is mimicking an AC output? As the Smart Glass I have seen, their controllers are saying the output is 70VAC Square Wave 25/30/32/50/60Hz.. Would this unit powered by 5v DC be able to achieve the 70VAC needed to operate the Smart Glass? As to my novice level I have only seen inverters to transform the DC to AC. I have looked into the H Bridge bu again still in beginners steps so please be patient with me! Thank you everyone!!
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DRV8234EVM: Online GUI
Part Number: DRV8234EVM
Hi -
Customer trying to use online GUI for both the DRV8234EVM and DRV8242H-Q1EVM. They can use downloadable GUI without issue, but web GUI problematic. They think it may have to do with the company IT firewalls.
Any ideas on what they can try?
Tyler
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DRV8262EVM: Cannot connect to computer.
Part Number: DRV8262EVM
Hello, I meet a problem when using DRV8262EVM.The status is that the D2 led cannot light on.
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DRV8245-Q1: nFAULT permanently asserted
Part Number: DRV8245-Q1
Hello,
I have been unable to make the HW variant of the DRV8245 work. A partial schematic is attached below as a PNG file.
1) the unpopulated PCB ohms out per the schematic
2) the populated PCB ohms out sensibly per the schematic
3) the load connected on J9 is a 12 VDC motor that draws about 1.2 A. The following conditions are seen if the motor is connected, but also if nothing is connected to J9
4) correct voltages are seen on all the input pins
5) nFAULT is always asserted (low) regardless of the state of IN2
6) OUT1 and OUT2 voltages are both around 0.3 V
7) IPROPI is 0 V
8) ITRIP = 6.25 V whereas the data sheet gives an absolute max rating of 5.75 V.
9) The IC is cold to the touch at all times
10) R27 is now 1k0 (on nFAULT), and there is a 100 nF cap now in parallel with R25 (for IPROPI)
11) the +5 V and +12 V supplies power up at the same time
I have been unable to figure this out and am hoping that someone can offer me guidance.
Thanks,
Phillip
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MCT8316Z: The datasheet and EVM board contents are inconsistent with the actual situation
Part Number: MCT8316Z
1. tWAKE and tSLEEP verification results are inconsistent with datasheet.
datasheet P9, wakeup time should <1ms, sleep pulse time should>120us ; The actual wakeup time measured is 1.74ms and tSleep is 86.7uS. Please confirm whether the test result is correct.
2. Timing diagram of Hall sensor. In datasheet P25, the hall signal of DIR=0 and DIR= 1 is the same. It should actually be inconsistent. The actual signal is shown below. DIR=0 on the left and DIR=1 on the right, please confirm.
3. MCT8316ZTEVM evaluation module User's Guide P18, whether the calculation formula of Motor speed is wrong.
The actual formula used by the GUI should look like the following figure
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MCF8316A: Motor keeps trying to start, but cannot advance to closed loop
Part Number: MCF8316A
Hi,
I have built a breakout that is very similar to the evaluation board and I can communicate with the controller over I2C. I set up the recommended default values and I can read them back.
When I try to start the MPET algorithm, I always get MPET_FAULT error. I searched the forum for a long time and tried many suggestions, but I cannot get the motor to start. Unfortunately, it does not have a datasheet, so I can only measure the Rph and Lph values and I also measured the Ke back EMF constant, so that I can skip the MPET algorithm. Still, after setting the measured values, the motor does not spin up, it only tries to start over and over again. I also tried to set Kp=10 and Ki=1, but still no success.
I'm using a a salvaged BLDC motor from a floppy drive, it has 3 pins with 4 pole pairs.
I measured the voltage on one of the phases and the signal looks like this:
Can you give me guidance on how to get the motor spinning?
Best regards,
Tibor
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DRV8245-Q1: DRV8245-Q1MCU control pin
Part Number: DRV8245-Q1
Hello.
I would like to ask about DRV8245-Q1 device.
1. In SPI(P), (VM undervoltage translators) is a question about how long and how much voltage it is.
2. Apart from the SPI connection, which pins should be essential to the MCU? Is there any function that SPI can replace?
- EN/IN1, PH/IN2, nSLEEP, nFAULT
3. I would like to ask if I can use more than 5.5A continuously (1oz 6Layer)
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