DRV8308: DRV8308 FAULTn active always except RESET

Viacheslav Patrokhin

Part Number: DRV8308

Hi,

I have such a problem. The sygnol on the leg FAULTn log.0 is constantly except when the RESET is high.
The engine is running. It is possible to reset errors in the 0x2A register, it will be state 0, but this does not change the signal on the FAULT pin, it will be low 0.

The RESET signal is given when ENABLE low. What kind of error and how to diagnose it. The engine is operating normally.

Appreciate for the answer. Vyacheslav

over 7 years ago

0 Adam Sidelsky over 7 years ago

TI__Guru 66550 points

Vyacheslav,

Are you using your own board or the EVM? I would check to see if your pull-up resistor on the fault line is working correctly or if it needs to be lower resistance.

Regards,

-Adam

0 Viacheslav Patrokhin over 7 years ago in reply to Adam Sidelsky

Prodigy 80 points

My circuit design.
10K resistor to 3.3 volt bus. Conductor at the input of the microcontroller is cut off

Put 3,0K result the same. May need to send a RESET serviced when ENABLE is high?

Сhecked the integrity of the circuits and the absence of closures on the board.

0 Adam Sidelsky over 7 years ago in reply to Viacheslav Patrokhin

TI__Guru 66550 points

Please check the signal with a scope and see if it can be pulled high by a 1k or similar.

Have you tried a second IC to make sure the first one is not damaged?

0 Viacheslav Patrokhin over 7 years ago in reply to Adam Sidelsky

Prodigy 80 points

I will check on Monday. For work this is not fatal. The second sample is in production. I will answer the result later.
The device can generate a FAULTn low signal when the register 0x2A is 00 state?

0 Adam Sidelsky over 7 years ago in reply to Viacheslav Patrokhin

TI__Guru 66550 points

The fault pin will correspond to register 2A but the register bits are sticky and need to be cleared manually while the fault pin is not sticky.

0 Viacheslav Patrokhin over 7 years ago in reply to Adam Sidelsky

Prodigy 80 points

Adam, thanks for the replies. I will look for the cause.

0 Esmith Gomes over 7 years ago in reply to Viacheslav Patrokhin

Intellectual 290 points

hello Viacheslav Patrokhin

it is possible you share your defines bits for your motor work???

i have the same chip DRV8308 but my motor don't run i don't now if is my defines for the register i have.

i want press a button and the motor RUN
I can read and write in the logs/registers

0 Viacheslav Patrokhin over 7 years ago in reply to Viacheslav Patrokhin

Prodigy 80 points

Adam, hello. Problem solved. She was on my program. Thanks for the help.

0 Viacheslav Patrokhin over 7 years ago in reply to Esmith Gomes

Prodigy 80 points

Hi Esmith Gomes
Here with this data in the registers the engine works. I just fixed the mistakes.
I will optimize now.

0x00 00 21
0x01 00 00
0x02 04 FF
0x03 4F D2
0x04 0F F2
0x05 00 00
0x06 00 00
0x07 00 00
0x09 00 00
0x0A 0F 00
0x0B 07 90
0x2A 00 00

Regards, Vyacheslav.

0 Esmith Gomes over 7 years ago in reply to Viacheslav Patrokhin

Intellectual 290 points

THANKS Viacheslav Patrokhin,

i put you register on my custom board and not work :(

i have erro 0x51

read from Acess Register: 0x2A

bits do Adress_FAULT BIN ->1010001
bits do Adress_FAULT HEX ->51

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DRV8308: DRV8308 FAULTn active always except RESET