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BQ27Z746: 怎么修改BQ27Z746的硬件保护参数

Prodigy 150 points
Part Number: BQ27Z746
Other Parts Discussed in Thread: BQ4050, BQSTUDIO

1、你好TI团队,我需要更改BQ27Z746的硬件保护参数,BQ27Z746的默认的HOCD是-16mV,如果我需要把这个值更改到-10mV,需要怎么变跟呢,直接在Data Memory 输入这个值,BQ27Z746的实际的HOCD并没有更改,还是-16mV。

2、变更这项参数后是否可以导出量产文件,以便烧录到产品上进行HOCD的变更。更改HOCD后每个产品都必须单独进行HOCD校准吗?无法像其他TI的产品,比如BQ4050变更了AOLD(硬件过载保护)后,直接导出量产文件,烧录到其他产品上就可以完成所有产品的AOLD变更。如果HW Threshold Targets的每个值都必须单独进行校准。如何实现量产的HW Threshold Targets变更呢。

3.关于HW Threshold Targets参数部分,TI没有详细的文件说明怎么更改HW Threshold Targets的参数。

  • 您好,

    1, HOCD flag check for current comparison, not voltage. You'd want to check with OCD Threshold, please see below.

    2,The srec does not contain hardware calibration parameters but it contains the firmware based protection parameters. Depends on what you are referencing.

  • HI TI_Guru  , HOCD 指的是这个参数,HOCD是-16mV,Rsns=2mΩ,保护电流是8A. 我想不改变Rsns的情况下改变这个保护电流。有什么方法吗?这个-16mV是BQ27Z746的默认值?

  • 您好,请参考下面链接的帖子,希望对您有帮助。

    e2e.ti.com/.../bq27z746-hocd-recovery

  • HI  TI_Guru,谢谢你的回复,但关于BQ27Z746的HW Threshold Targets部分的参数,default值是否能够修改,怎么修改。TI没有详细的说明文件。希望后续可以有明确的说明。

  • 您好, HW保护不能通过参数直接修改, 详细请参考下面内容:

    HW protection thresholds can't be configured in Data Memory. It must be done through calibration (it's part of HW trim). The Threshold Target parameters do not have a direct effect. Check TRM:

    The trim calibration requires an updated .bqz file for bqStudio, which is not available yet and will be released soon.

    bqStudio cannot program the keys. It's intended to test keys. See the TRM for more information about authentication.