2串的计量板,可以通讯,无法开启MOS,短路PRES可以开启MOS.PRES放开后MOS关闭.
原理图:
Bit Registers:
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您好,这是正常现象。
8.3.5.2 System Present Operation The bq40z50-R1 checks the PRES pin periodically (1 s). If PRES input is pulled to ground by the external system, the bq40z50-R1 detects this as system present.
9.2.2.2.3 System Present The System Present signal is used to inform the gas gauge whether the pack is installed into or removed from the system. In the host system, this pin is grounded. The PRES pin of the bq40z50-R1 is occasionally sampled to test for system present