Hi team,
Here's an issue from the customer may need your help:
ACK signal can be received when writing (there was no code read in the code). When reading, it was NACK and then the write failed to ACK. ACK will reappear unless no read code added to the code after the reboot. Could you help check this case? Thanks.
Best Regards,
Cherry
Hi Eric,
Thanks for support.
The waveform of the logic analyzer is shown below when writing and reading data:
（Writing）
(reading)
With software IIC, the write should be successful because the customer tried to change the output voltage by command (3.3V, 4V, 5V all ok) but there was a problem when reading the data.
The customer also tried to spin the motor by writing the default register data in and found that the motor only had to swing back and forth for a period of time, and the current stopped at around 150mA. The command was written to connect an external PWM signal, but the behavior was the same whether it was external or not.
Thanks and regards,
Cherry
Hi Cherry,
Could you please help ask the customer the following questions:
I don't see 100-us inter-byte delay in the I2C write waveform. This may not be the cause of the read issue, but I'd still recommend the customer to add this 100us delay between every byte.
When the device is programmed with default settings, the motor parameters are all 0, and the device will automatically try to run MPET to measure the parameters when a speed command is provided. When the customer saw the motor moving back & forth, it's possible that the device attempted to but failed at running MPET. To bypass MPET and give the motor a good chance of spinning up , they can try programming the motor resistance, inductance, BEMF constant manually by referring to Section 7.3.12 of the datasheet.
Regards,
Eric C.
