Part Number: DRV8802-Q1
We have developed working prototype using DRV8802 motor driver IC, after developing custom PCB we are facing some issues. We have compared voltage values on all the pins(on DRV8802) in prototype board and custom board and we see following differences
The above values are taken at 13.5V supply voltage and the motors are not operating in the custom board whereas it is working in prototype board.
Request to help us in debugging this issue.
Assuming you have checked multiple boards, this appears to be a problem with the new configuration.
Please place nSLEEP low if possible and re-measure the CP2 and VCP voltages. VCP should be ~12V. If it is not, please double check the schematic, layout, and soldering of the board.
Best Regards,Rick DuncanMotor Applications Team
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Rick Duncan:
Hi Rick Duncan,
Thank you for the prompt reply, your suggestions helped us to further debug our board.
In custom board we missed 1 Mohm resistor which is connected across Vcp and after soldering the resistor on the board we observe the following results
At Input voltage(Vm) of 13V
Motors are still not operating. Following are the design accepts
AVref = BVref = 3.3V
AI0 = AI1 = BI1 = BI0 = GND
IsenseA = IsenseB = 1 ohm
In reply to Brijender Ramgopal:
Have you examined the input signals?
Is the device awake (nSLEEP = logic 1)?
What is the V3P3OUT voltage?
Also you did not confirm that you have seen this on multiple custom boards? Do all custom boards behave this way?
Can you provide a snippet of the schematic and layout showing the connections around the DRV8802? We can make arrangements to share them privately if necessary.
Yes RESET,AENABLE, APHASE , BENABLE & BPHASE are controlled to MCU and on activation we have measures the voltages on the these pins.
Yes the nSLEEP pin is connected to MCU GPIO pin and we have verified voltage across it is 3.3V on enabling the GPIO pins.
The first board is hand made circuit which is working fine second board is fabricated one which is not working, the only diffference is in the first one is configured for 71% of max current and the second one is configured as 100% by configuring AI0,AI1,BI0,BI1
Please let me know how we can share the schematics with you.
Instructions have been sent. If you have not received them, please let me know.
I have recieved the instructions and also forwarded you the schematics.
Thank you for the instructions. For now, I will mark this thread as "TI thinks Resolved". You can still reply to the thread and I may update the findings if the community can benefit.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.