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BQ24780 如何设置

hai chen
Prodigy 20 points


bq24780设置及读写状态值
1.bq24780设置
  电池充电电流设置 寄存器 0x14  0x0200
  电池充电电压设置 寄存器 0x15  0x1000
  充电操作控制     寄存器 0x38  0x0304
  报警状态控制     寄存器 0x3d  0x813b
2.bq24780状态读取
  主电状态       寄存器   0x37  
  备电状态       寄存器   0x3a
通过上述设置后，电池充电电流只有几十mA,请问是那设置错了吗！原理图及PCB设计 按EVM板做的。可以实现主备电切换，及主备电状态的读取
  • 0
    TI__Guru*** 130456 points

    您先参考数据手册7.3.3 Enable and Disable Charging确认是否锁有条件都满足，再确认是不是设置的问题。

  • 0 回复 Star Xu
    Prodigy 20 points

    • Charge is enabled through SMBus (REG0x12[0], default is 0, charge enabled)
    • ILIM pin voltage is higher than 120 mV
    • All ChargeCurrent(), ChargeVoltage() and InputCurrent() registers have valid value programmed
    • ACOK is valid (see Device Power Up for details)
    • ACFET and RBFET turn on and gate voltage is high enough (see System Power Selection for details)
    • VSRN does not exceed BATOVP threshold
    • IC temperature does not exceed TSHUT threshold
    • Not in ACOC condition (see Device Protections Features for details)

    这些条件没有不满足的，充电时，一开始有2A左右电流，然后，电流在20S内减少到几十mA