Hi, Rick.
I have last question, now i tried to work with drv8837, can you explain me how i should to use IN1 and IN2, if i have just one signal - my PWM signal, i'm trying to apply it for IN1, but what could i do with IN2
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RE: DRV8841: Where can i get library of this product for OrCAD?
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DRV8841: Where can i get library of this product for OrCAD?
Part Number: DRV8841
Hi, i work with TI products and have to use OrCAD for further creating board layout. But i face with problem that i can't get library with TI products. Especially, i'm interesting in DRV8841 .olb
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RE: DRV8701: DRV8701PRGET
Hi Jean,
How are you controlling the current?
Can you provide some scope captures of the inputs and currents?
How are you controlling the current?
Can you provide some scope captures of the inputs and currents?
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RE: DRV8701: DRV8701PRGET
Hi Duncan,
Im controlling the power output level with a pot connected to the MCU (called CURRENT). Basically this is a copy of the DRV8701 dev kit. I have attached the schematics of the MCU, regulators and amplifier interface. I will send you scope captures shortly. In the meantime I have noticed the nFAULT output of the amplifier toggling on every zero crossing detection and Im not sure why. I will get you more diagnostic information ASAP.
Image may be NSFW.
Clik here to view.
Regards,
JeanImage may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
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RE: DRV10866: Fails to start motor sometimes, when pulsing motor
My theory is that the motor requires more than the 3.6V that the MSP430EVM provides (and that I tested with using a separate 3.6V power supply.) Unfortunately, I can’t find the data sheet for the motor provided in the DRV10866EVM (best I can tell it is an NMB Minebea of 25mm diameter. Datasheet for NMB Minebea current products that size don’t specify a minimum voltage, just a maximum voltage of 12V. The label on the sleeve in the DRV10866EMV says "5V" but not whether that is a minimum, operating, or maximum.)
Reading the DRV10963EVM User’s Guide, which discusses tuning the chip so the motor will start reliably. Does the DRV10866 suffer the same requirement to test the chip with a specific motor to determine how reliably it will start, without the possibility of tuning parameters of the chip? I want to call it a “resonance” problem: that a motor’s parameters mean that there are certain conditions (position of the rotor) where the parameters of the fixed(?) startup (in this case including an inadequate voltage) just oscillate the motor without starting it.
I will order the target motor and test it.
I could use a stepper motor; I only chose the DRV10866 for its simplicity, and I guess that a BLDC is more efficient.
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RE: DRV8841: Where can i get library of this product for OrCAD?
Hi Ivan,
You can either leave IN2 floating (there is an internal 100kOhm pulldown) or connect to gnd.
You can either leave IN2 floating (there is an internal 100kOhm pulldown) or connect to gnd.
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RE: DRV8841: Where can i get library of this product for OrCAD?
Hi, Rick. I have error "ERROR(ORPSIM-15108): Subcircuit DRV8837 used by X_U14 is undefined"
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SN754410: H-Bridge weird behavior
Part Number: SN754410
Hello,
I'm using the SN754410 to drive an actuator. I set it up on a breadboard and interfaced it with a micro-controller.
It work perfectly, until I changed the SN754410 to another breadboard, after that I've noticed weird behavior on the H-bridge.
Below is the schematic of my connections:
Image may be NSFW.
Clik here to view.
The weird behavior revolves around pin 1A (pin 2). I measured the voltage on 1A with a voltmeter and this are my observations:
- When no voltage is applied on Vcc2:
- 1A goes HIGH and LOW, HIGH with a value of 5V and LOW with a value of 0.20V
- When there is voltage supplied on Vcc2(12V):
- 1A goes HIGH with a voltage of 5V but LOW stays around 2.10V and thus the output 1Y never goes low
I also measured pin 2A to compare it to 1A; 2A goes to 0V when LOW whether there is voltage or not at Vcc2.
These are some of the things I have tried to fix the problem:
- I tried changing the SN754410 for another. I tried 4 others and all of them had the same problem. They were all brand new.
- I tried using pull down resistors for the INPUTS of the SN754410 (EN, 1A, 2A). In this case 1A would go LOW but HIGH was about 1.2V
- I have tried changing the micro-controller, nothing.
- I have tried changing it to another breadboard, still nothing
I don't understand why it suddenly stopped working, I've been looking around but haven't found anything that could help me solve this problem.
Here is the datasheet for the SN754410: http://www.exploringarduino.com/wp-content/uploads/2013/06/SN754410-datasheet.pdf
I am looking for any help on what I could be doing wrong or what is wrong, I am happy to answer any questions to clarify anything!
Thank You!
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RE: DRV8833: DRV8833 reset by Inrush current
Hi Rick
Are you having specific more question?
is it meaning channel 1 which yellow line of wave as a above?
Best Regard
Gerald
Are you having specific more question?
is it meaning channel 1 which yellow line of wave as a above?
Best Regard
Gerald
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RE: DRV8313: DRV8313 About V3P3 output at sleep mode of EVM
Hi Rick,
How is the progress about this question?
Best regards,
Shimizu
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DRV8313: DRV8313 About V3P3 output at sleep mode of EVM
Part Number: DRV8313
Hi,
I have a question about V3P3.
I use DRV8313EVM.
I confirmed that V3P3 is eneble at VM power-on (not connect USB), nSlEEP/nRESET is Low.
I saw TP2.
Why is V3P3 enable?
Maybe, i think that V3P3 is disable at sleep mode from datasheet.
But there is the difference between datasheet and my bench.
Best regards,
Shimizu
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RE: DRV8841: Where can i get library of this product for OrCAD?
Hi Ivan,
What are you trying to do? What simulator are you using? Do you have a log file? If so, would you attach the file?
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RE: DRV8833: DRV8833 reset by Inrush current
Hi Gerald,
Yes, what signal is channel 1 above connected to?
Yes, what signal is channel 1 above connected to?
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RE: DRV8313: About minimum value of UVLO and behavior of V3P3 regulator
Hi Kanemaru-san,
[quote user="hideto kanemaru"]
[Q1]
Could you please let us know the minimum value of UVLO(VULO_min) if you have any information?
*This value does not need to be a guarantee.
[/quote]
Min Vvulo is 5.9V
[quote user="hideto kanemaru"]
[Q2]
I understand that “V3P3 regulator” is enabled if VM is more than the VULO_min.
So, my understanding is as follows.
-V3P3 regulator is disabled if UVLO_min ＞ VM
-V3P3 regulator is enabled if UVLO_min ≦ VM
Is my understanding correct?
[/quote]
We will check this and reply soon.
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DRV8313: About minimum value of UVLO and behavior of V3P3 regulator
Part Number: DRV8313
Hi Team,
Our customer are evaluating DRV8313 and they have two questions.
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[Q1]
Could you please let us know the minimum value of UVLO(VULO_min) if you have any information?
*This value does not need to be a guarantee.
Image may be NSFW.
Clik here to view.
-----
[Q2]
I understand that “V3P3 regulator” is enabled if VM is more than the VULO_min.
So, my understanding is as follows.
-V3P3 regulator is disabled if UVLO_min ＞ VM
-V3P3 regulator is enabled if UVLO_min ≦ VM
Is my understanding correct?
------------
<Back ground>
According to our customer, they worry about false operation of the V3P3 regulator.
Because, an unintended voltage(Voltage level is TBD) appears in "VM pin" when a reverse electromotive voltage occurred.
Regards,
Kanemaru
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RE: DRV8701: DRV8701PRGET
Hi Jean,
Have you compared the nFAULT behavior using Table 7 (Fault Response) of the datasheet? This may provide some clues to the cause.
What is the value of C16?
Have you compared the nFAULT behavior using Table 7 (Fault Response) of the datasheet? This may provide some clues to the cause.
What is the value of C16?
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RE: DRV8841: Where can i get library of this product for OrCAD?
(Please visit the site to view this file)Hi, Rick.
I'm using OrCAD 17.2. Here is my output file
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RE: DRV8711: Behavior of SDATO Pin During Write Operation
Hello Michael,
Coming back to your first question, I confirmed and you cannot SPI daisy chain. The data will not shift from one device to the next one. Thank you.
Coming back to your first question, I confirmed and you cannot SPI daisy chain. The data will not shift from one device to the next one. Thank you.
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RE: DRV8701: DRV8701PRGET
Hi Rick,
I have looked at the fault table and it might be that perhaps because the FET output stage is seeing rectified a.c voltage waves its going under-voltage? Im not sure. I will get you the scope shots today so you can see the input voltage, output voltage and various control signals. The value of C16 is 1uF.
Regards,
Jean
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RE: DRV8812: Is there any sequence when the nSLEEP asserted
Hello Aoyama-san,
Thank you for the information provided.
You mentioned:
The customer always input ENBL high.
- This is acceptable
The customer stop the motor with nSLEEP assert.
- This is acceptable
Driver should be able to operate properly under described conditions. Can you please provide scope captures if possible? Is the overcurrent event only during the transition from stop to CCW direction?
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