DRV8303: fr

Ryan Lin57

Prodigy 40 points

Part Number: DRV8303

Hi, I tried to change my DRV8303's pwm_mode to 3-pwm input via SPI

It successed on read/write 0x0-0x3 but only PWM_MODE, once I set to 3-pwm input that next cycle gives a fault bit.

could any reason causes this case like me? Thanks!

over 8 years ago

0 Ryan Lin57 over 8 years ago

Prodigy 40 points

Part Number: DRV8303

Hi, I tried to change DRV8303 'PWM_MODE' to 3-pwm input,

I do access 0x00-0x03 registers via SPI well but once I change register 0x02 D3 as 3-pwm input

It responsed a fault bit(F0), any reason could cause case like me? Thanks!

0 Rick Duncan over 8 years ago

TI__Guru** 114905 points

Hi Ryan,

I have merged the two threads into one.

0 Rick Duncan over 8 years ago in reply to Rick Duncan

TI__Guru** 114905 points

Hi Ryan,

Have you read the fault code in the status registers? This should provide clues to the cause.

0 Ryan Lin57 over 8 years ago in reply to Rick Duncan

Prodigy 40 points

Hi, Rick
Thanks for reply. Yes, I read status register1 and 2 (0x0, 0x1). all fault flag wasn't raise, nFault pin gives logic high.
Does it need any pre-procedure to change PWM_MODE?
In this case, almost peripheral components are the same as typical application from DRV8303's datasheet.
PVDD->12V
VDD_SPI->3.3V
EN_GATE->3.3V

0 Ryan Lin57 over 8 years ago in reply to Rick Duncan

Prodigy 40 points

After few days test, I found that once I remove those two 10mOhm(open circuit) sense resistor
all register access via SPI was successed.

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DRV8303: fr