BQ32002: Interface BQ32002 with CC2640R2F

Hi,

I need interface the BQ32002 RTC with CC2640R2F and I think to use the function in  SensorI2C.h. 

In the BQ32002 datasheet : 

to read the register (pg.11 fig.6) send:

1)0xD0 to select the device in write mode;

2)the sub-address where read;

3)0xD1 to select the device in read mode;

I don't understand why.

Following the procedure with SensorI2C I should:

1)SensorI2C_select(0, 0xD1);

2)SensorI2C_read(pData, nBytes);

should it work?

Thanks.

Best regards.

Giuseppe