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BOOSTXL-DRV8323RH: Motor drivers forum

Jay Lee1
Prodigy 20 points
Part Number: BOOSTXL-DRV8323RH
Other Parts Discussed in Thread: BOOSTXL-DRV8323RS

Hi,

I'm trying to digest DRV8323RH's key features for the motor driver development of our company. I have a very basic question on 7 level input pin structure for idrive and VDS.

According to the datasheet there is a figure of seven level input structure (attached below). For me, it is not super clear. I have several questions to make it clear. 

1) I tried to tie a node between R1 and R5 to DVDD or AGND. I checked Gate drive signal changed once I made a change. Are these configurations represent V_I7 (Maximum) and V_I1 (Minimum) state?

2) I don't get it what's the main difference between "75kohm to DVDD" and "75kohm to AGND", and how it should be configured. The default hardware setup is two 75kohm resistors are connected in series (R1 and R5). What's the state for this configuration? V_I5 or V_I3?

3) I'm wondering if only resistor value change in R1 and R2 make all 7 level configurations. If I want to change the state, do I need to replace 75kohms on R1 and R5 to others? Do I need to connect extra resistor on the middle node? 

Since I'm the new user with this evaluation board, I need your help. I'm look forward to hearing from you soon. Thank you. 

  • 0
    TI__Guru 65190 points

    Jay,

    You cannot simply tie the node high or low with the resistors still mounted. The hardware control pins are also checked and latched at startup so they will not change if you modify these nodes after powerup.

    The board comes with both 75k pull up and pull down installed so that it's the most flexible to the customer as they can remove either one to use the V_I5 or V_I3 case. As configured with both installed the board is setup in V_I4 or High-Z.

    I think it is best for you to get a  BOOSTXL-DRV8323RS board so that you can customize the IDRIVE settings and others by SPI instead of hardware modification. In the end you can use a hardware device once you are happy with the prototype board.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Prodigy 20 points

    Hi Adam,

    Thank you for your answer. I understand how I can control idrive configuration. Thanks a lot!!

    Best,

    Jay