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关于BQ78350-R1 BAT与 ExtAveCellVoltage 的关系

user4723031
Prodigy 110 points

Other Parts Discussed in Thread: BQ78350-R1

在bq78350-R1 Technical Reference上有说

ExtAveEN (Bit 4): Enables the bq78350-R1 to measure the BAT input
0 = BAT input is not measured.
1 = BAT input is measured and made available via ExtAveCellVoltage() (default)

能否给出 BAT产生 ExtAveCellVoltage() 的公式

谢谢！

  • 0
    TI__Guru*** 130456 points
    这个公式没有提供, 如何设置ExtAveCellVoltage请看下面的说明
    The gauge can use either the Ext Avg Cell voltage or by default the lowest cell voltage for gauging. If the EDV_EXT_CELL bit is set in the CEDV Gauging Configuration data memory then the Ext Avg Cell voltage would be used. If you don't want to use the average cell selection the BAT pin divider is not needed, the BAT pin could be connected to GND.
  • 0 回复 Star Xu
    Prodigy 110 points

    OK，

    这样的话，R47 与 R48的参数如何确定呢？

  • 0 回复 user4723031
    TI__Guru*** 130456 points

    选择一个电阻分压器，以满足您的需要。BAT的范围是有限的。如果需要，可以使用其他值。注意所示的25ppm/C温度系数。你可以校正公差，但也许不能校正漂移。您通常需要低电流和现成的组件。

    关于R47您不能用NTC或者PTC，you would prefer stable resistors over temperature for the voltage divider. For a general pull up or pull down resistor you may not care if you have 100ppm/C or more change but here you might want good performance.