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您好！我想请问一下，我试想从外部单片机IIC跟BQ40Z80 SMD通信，读取BQ40Z80一些寄存器数据，这样做合理吗？我想读取一些寄存器数据，传给其他设备，以便进行二次开发，不知道这样子能不能实现。
您好
可以，是SMBUS通讯，BQ40Z80作为从机。
可以参考这个帖子里面的讨论。
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1354407/bq40z80-bq40z80-smbus-master-mode-and-slave-mode
我帮您查了有没有相关例程，很遗憾，TI只有一些app notes，具体见下方链接。
e2e.ti.com/.../bq40z80-what-mcu-is-recommended-for-use-with-the-bq40z80-something-that-has-a-well-documented-and-frequently-used-smbus-capability
