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BQ76952: BQ76952芯片的工作温度， 为啥在75~80摄氏度就不工作了。 Why do bq76952 stop work over 75 degree

jian zhang
Prodigy 60 points
Part Number: BQ76952

我们做实验的时候，遇到一个问题，BQ76952工作温度可以到85度，为什么超过75度就不工作了。 怎么设置工作温度的门限？

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We find  bq76952 stop work  over 75 degree, how  to  set the  work temperature threshold.

  • 0
    TI__Guru*** 130456 points

    您好，温度采样配置和相关系数计算是否配置，请参考下面文档的内容。

    www.ti.com.cn/.../zhcabz9.pdf

  • 0 回复 Star Xu
    Prodigy 60 points

    SHUTDOWNTEMPERATURE 0x9244U,  设置SHUTDOWN温度为120度后：BQ769x2_SetRegister(SHUTDOWNTEMPERATURE, 120, 1U); ，任然在85度下就不工作了。还有哪个温度有影响

  • 0 回复 jian zhang
    TI__Guru*** 130456 points

    您好，请参考下面内容：

    The BQ76952 has several over temperature protections. Please see below



    Which OVT protection is customer trying to use?

    As for the Shutdown Temperature, the device will enter shutdown mode if (Internal Temperature > Power:Shutdown:Shutdown Temperature) for Power:Shutdown:Shutdown Temperature Delay seconds. By default the is  Power:Shutdown:Shutdown Temperature 85˚ C. Maybe the threshold did not get properly changed. I suggest reading back from address 0x9244 to see if it is set to 120˚ C.

    Maybe also set the Internal Overtemperature Protection in Protections:OTINT:Threshold to 120˚ C or disable the Settings:Protection:Enabled Protections B:[OTINT] configuration bit.

  • 0 回复 Star Xu
    Prodigy 60 points

      BQ769x2_SetRegister(SHUTDOWNTEMPERATURE,120,1);
    BQ769x2_SetRegister(OTINTTHRESHOLD,115,1);
    BQ769x2_SetRegister(OTINTRECOVERY,113,1);
    BQ769x2_SetRegister(SOTTHRESHOLD,113,1);
    BQ769x2_SetRegister(SOTFTHRESHOLD,113,1);确实有效果，但是在温度到85℃附近的时候，实测AFE还是会进入一次SHUTDOWN，需要进行一次唤醒操作，唤醒之后AFE能持续在高温下工作，请问下这个是什么原因. 就是说温度到了85度会进行一次SHUTDOWN，唤醒后，后面的温度更高超过85度也不会SHUTDOWN,还有哪个地方需要设置。

  • 0 回复 jian zhang
    TI__Guru*** 130456 points

    您好，正在询问更了解这款芯片的TI工程师，稍后回复。

  • 0 回复 Star Xu
    TI__Guru*** 130456 points

    您好，We recommend to operate the BQ76952 in between -40C and 85C for max conditions. An external thermistor can be used to measure the voltage on the cells, but max operating temp for internal purpose is 85C.

    为什么温度会这么高？你能解释一下应用场景吗？