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DRV8899-Q1: 8899 motor drive chip usage

Part Number: DRV8899-Q1
Other Parts Discussed in Thread: DRV8889-Q1

Tool/software:

The chip manual for 8899 does not provide configuration descriptions for some registers, only stating that it is applicable to 8889, such as the CTRL2 control register (address=0x04). Does it support 8899? The technical manual only describes the use of 8889?
If not supported, what are the default settings for this part? Does it have an impact on those aspects?
Does 8899 support reading stall information? How to read stall information? I didn't see any relevant information in the manual?

  • Hi Ni,

    Thank you for your post.

    The chip manual for 8899 does not provide configuration descriptions for some registers, only stating that it is applicable to 8889, such as the CTRL2 control register (address=0x04).

    CTRL5 to CTRL7 are reserved RSVD in the DRV8899-Q1. These registers are not supported. Also the corresponding diagnostics bits are not available STL in FAULT status, STL_LRN_OK and STALL in DIAG Status 2.

    If not supported, what are the default settings for this part? Does it have an impact on those aspects?
    Does 8899 support reading stall information? How to read stall information? I didn't see any relevant information in the manual?

    The DRV8899-Q1 does not have stall detection function. Only the DRV8889-Q1 does. If you need stall detection in your application you must use the DRV8889-Q1 device. 

    Regards, Murugavel 

  • Thank you for your answer. Regarding how the CTRL2 register is configured for Smart tune decay technology, Fixed slow, and mixed decay options, the documentation says that “CTRL2 is shown in Figure 7-34 and CTRL2 Control Register for DRV8889A-Q1 and described in Table 7-22. Read/Write” is it understood that the use of the CTRL2 register for the DRV8889A-Q1 and 8899 is the same? If it is not 8899 how to configure the CTRL2 register to realize Smart tune decay technology?

  • Hi Ni,

    I noticed that - unfortunately a typo. The DRV8889-Q1 and DRV8899-Q1 DIS_OUT default value is the same. Only for the DRV8889A-Q1 it is different. The smart tune decay is set by bits 2-0, three bits. The default value is for smart tune ripple control. Some applications may have lower audible noise with smart tune dynamic decay. CTRL2 is available in the DRV8899-Q1. Only CTRL5 to CTRL7 are reserved RSVD in the DRV8899-Q1. You can use CTRL2 for the DRV8899-Q1 no issues. Thank you.

    Regards, Murugavel