DRV8343-Q1: Technical questions regarding some register settings

Hi Shinya,

Thanks for the question. I will aim to provide feedback by the end of next week.

Best,

Sarah

Hi Sarah,

This is a gentle reminder. I'm looking forward to hearing from your feedback.

Thanks.

Shinya Sawamoto said:

1. Is it possible to set TDRIVE_MAX = 20 μ s if ① IDRIVE_xx = 0100b = 15 mA? 

No it is not possible, page 29 in the data sheet provides more detail.

"In the SPI device, for IDRIVE bit settings of 0000b, 0001b, 0010b, and 0011b, a longer tDRIVE time of 20-µs is automatically selected by the TDRIVE_MAX bit. If the 20-µs tDRVIE time is not required, write a 0 to the TDRIVE_MAX bit to disable it and set the tDRIVE time by the TDRIVE bits. For all other IDRIVE settings, writing to the TDRIVE_MAX bit is disabled"

Shinya Sawamoto said:

2. If DIS_GDF = 1b (disabled), what are the risks to DRV8343S?
(For example, when there is a short circuit between the G-S of the external FET, the gate current flows too much and the DRV8343S fails.)

3. When DIS_GDF = 1b (invalid), recognized that there are not a notification by nFAULT and operation stop, is that correct that the diagnostic bits of Fault Status and DIAG Status are asserted?

4. Even if DIS_GDF = 1b (disabled) is set, is there a case where nFAULT notification or operation stops?

If DIS_GDF = 1b there will be no recovery action performed by the gate driver and nFault will not report a fault for this condition. Above is the full table of fault actions and responses. nFault reporting can still occur if you have configured other faults to report even though DIS_GDF=1b.

Shinya Sawamoto said:

DIAG Status are asserted

Can you clarify your question for DIAG status? We do have a nDIAG pin in the Hardware variant and DIAG registers for the SPI variant.

Best,

Sarah

Sarah,

The DIAG status means a read back from the DIAG register. The customer uses SPI version.

Thanks,

Hi Shinya,

Understood that the customer is using the SPI version of the device. Can you clarify your question regarding DIAG status and what confusion you have?

Best,

Sarah

Sarah,

Let me ask differently. The table.9 indicates that "Report" is "None2. Does the "Report" include the DIAG status register as well as nFault?

Regards

Hi Shinya,

Thanks for the response, I will provide my feedback in the next few days.

Best,

Sarah