BQ4050中过充、过放、过流保护的精度是多少?温度保护精度是多少?在datasheet和RTM中都没有找到
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您好 ,请参考下面的文档,适用于大多数的电量计芯片。
您好,The OCD1,2 are both firmware based protections, the registers are updated every second. The ADC for coulomb counting is summing so it may take multiple updates for the firmware to take affect. You would need to use the hardware protections for faster response.
您好,The firmware protection is not intended to be fast. It is checked every 1 s in active mode, so if the OCD1 event it not detected in the first second, it will be detected in the following second window. The delay may be up to 2s greater than what is set as the delay for OCD1.
如果需要更快速的保护,可以使用AFE Protection Control
你之所以提出这样的问题,是没有明白,BQ4050内部构架,BQ4050内部实质是一个AFE+MCU来管理的,过流保护之所以延时时间和实际写的时间对不上,是因为它上面的延时,实际上从MCU唤醒开始计算时间的,而MCU的电源管理方式,是间隔式自启和休眠策略,正常时间都会多2-3秒时间,这是正常的。
延时多长时间取决于你的POWER管理设置,(正常MCU唤醒时间,1-4秒内+设置的OCD过流延时),也可以将SMBUS的通信线上拉,延时时间将会减少很多,不过待机功耗将会相应增大,