• 状态
  • 已锁定 已锁定
  • 个回复 2 个回复
  • 名订阅用户 43 名订阅用户
  • 次查看 866 次查看
  • 用户 0 名在线用户
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.

BQ76940 DEVICE_XREADY异常置位

user5986860
Prodigy 140 points
Other Parts Discussed in Thread: BQ76940

hi，TI大神：

       目前用BQ76940+MCU做了一个15串的电池板子，调试时候发现电池电压增加到53V左右时候， DEVICE_XREADY会置位，MCU发指令清除后又会重新置位，程序快速清除又置位会导致MCU读取数据混乱；目前做过以下测试：

1. 总电池电压低于50V时候都正常，只有电压高于53V左右才出现此问题；

2. 把15串中其中一节电压调到2V，总体电压高于54V时候，没有出现此问题；

3. 去掉MCU与AFE的通信连接，使用BQ76940上位机测试又是正常的；

附上原理图，请帮忙看看异常原因，TKS~~

7823.15S4P_SCH_V0.1.pdf

  • 0
    TI__Guru*** 130456 points

    XREADY is a status of the a previous or current communication fault. many a times, the problem is the UPPER cells are in UNDER VOLTAGE mode after the WAKE pulse. The Upper groups is NOT communicating. Likewise, to enter SHIPMODE, the lower group has to get ACK from the upper group. A common issue is CAP2 or CAP 3 is become leaky. Check the VCAP voltage. Make certain, after issuing the SHIPmode command, all the groups are being turned off. CAP 3, CAP2 and voltage on SCL should be pulled LOW.

  • 0
    Prodigy 15 points

    您好，此问题我们也出现了。在AGV小车上，MCU软件上做了重置BQ，但是有的还是反复出现。目前推测是外界信号干扰造成。请问您有解决此问题吗？希望你能共享一下，谢谢。