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BQ27520-G4: 无法下载固件,但可以读寄存器

Part Number: BQ27520-G4
Other Parts Discussed in Thread: BQSTUDIO, , EV2400

BQ27520-G4用bqstudio下载几次固件后就无法再下载固件了,但可以正常读写data memory,新换一片新的芯片就可以正常烧录。这种情况一般是什么原因?芯片有烧录次数限次吗?