• 状态
  • 已锁定 已锁定
  • 回复 2 回复
  • 订户 55 订户
  • 视图 1622 视图
  • 用户 0 会员在此处
选项
选项
相关

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ76930

Jace Chen
Expert 1590 points
Other Parts Discussed in Thread: BQ76930, TIDA-00792

以下疑问帮忙解答下，谢谢！

(1)BQ76930规格书上提到的单体电压采集范围是2-5V，当单体电池电压在2V以下时，IC会上报什么样的电压值呢？

(2)BQ76930的电流采集精度在实际应用中的采集精度是多少？

(3)规格书上TS1接的一个按钮开关(按下后REGOUT才有输出)，规格书上给出的启动时间Tboot最大需要2ms的时间，实际产品开发中不可能接一个这样的开关，每次上电后都要按一下按钮开关芯片才有输出，那只能用MCU去控制了(这样就占用了MCU的一个IO口)，能不用按钮开关，直接将按钮开关短接吗？

  • 0
    TI__Prodigy 220 points
    Hi，
    1. The ADC of the bq76930 will continue to convert and display voltages. The error will increase and may be beyond the spec which applies above 2V when below 2V.

    2. Current sensing accuracy of the bq76930 hardware protection is specified in the data sheet OCOFFSET and OCSCALEERR. For the coulomb counter see the 16-BIT CC FOR PACK CURRENT MEASUREMENT section and be sure to set the CC_CFG REGISTER to the recommended 0x19 value.

    3. Use a circuit to provide a pulse to the TS1 pin to wake the part when desired. An appropriate circuit will vary depending on your system design. See the application note bq769x0 boot switch alternatives for ideas. TIDA-00792 has an example of a wake up circuit from the charger connection with high side protection switching.

    Jimmy
  • 0
    TI__Guru*** 130456 points
    3. boot您可以参考下面的方案做。
    www.ti.com.cn/.../slua769.pdf