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BQ76PL455A-Q1电池采样周期时间求解

Cheng Oscar
Prodigy 131 points

Spec. (ZHCSEK2B): 全部电芯的总转换时间 2.4ms（标称值）,请问2.4ms如何计算? 暂存器设定条件为何?

  • 0
    TI__Mastermind 20765 points

    这个跟你具体的配置有关。

    –AFE_PCTRL = 1 (causes 100us for ADC power up)
    –Cell ADC sample period (ADC_PERIOD_VOL) = 60us
    –ADC sample period for oversamples (CMD_OVS_GPER) = 12.6us
    –Staying on a cell channel to oversample (CMD_OVS_CYCLE
    16 cell channels only: 100us + (60us + (12.6us x 7)) x 16 = ~2.47ms
  • 0 回复 Hugo Zhang
    Prodigy 131 points

    Hi Hugo,

    感谢你的详细说明, 针对回覆内容仍有些疑问请跟您讨论, 请看下列说明：

    1. ADC sample period for oversamples, 你在文章中提到设定CMD_OVS_GPER=12.6这里好像有误, 请看Spec.(SLUSC51B) page25 Table2, ADC 采样只能用CMD_OVS_HPER, 并且手册上也提到 "if CMD_OVS_CYCLE = 0, then the oversample period for the Cell channels is set by bits CMD_OVS_HPER", 所以关于这一点究竟是不是我误解了

    2. 依照回覆内容的采样时间计算方式, 正常侦测循环下(非开机上电状态), pl455电池电压采样所需时间=(12.6 x 7) x 16 = 1.411ms请问我的理解是否正确? 

    3. 请问pl455这么多自检测功能中, 是否有检测采样时间的方法?