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BQ40Z80: programming application request

Part Number: BQ40Z80
Other Parts Discussed in Thread: BQSTUDIO

1. what size is data flash of BQ40Z80?

2. Does the data flash can be modified by I2C interface?

3. As above question, how to modify? By using a specific I2C command to access data flash?

4.  Does BQ40Z80 image can be updated by I2C interface? or only by a specific writer for BQ40Z80?

5. Does user update BQ40Z80 image by I2C of another MCU, not by writer? or user only can access data flash?

thank you.