Hello, in the diagram shown bellow taken from Si7021 sensor datasheet shon bellow page 20.
we have a checksum stage.
I cant see where the LS Byte ends and where the checksum starts? the while 10 step is not clear to me with regarding of what going after what?
Thanks.


https://www.silabs.com/documents/public/data-sheets/Si7021-A20.pdf

 

RTFDS p.19 § 5.1
Optionally, a checksum byte can be returned from the slave for use in checking for transmission errors. The checksum byte will follow the least significant measurement byte if it is acknowledged by the master. The checksum byte is not returned if the master “not acknowledges” the least significant measurement byte. The checksum byte is calculated using a CRC generator polynomial of x8 + x5 + x4 + 1, with an initialization of 0x00. The checksum byte is optional after initiating an RH or temperature measurement with commands 0xE5, 0xF5, 0xE3, and 0xF3. The checksum byte is required for reading the electronic ID with commands 0xFA 0x0F and 0xFC 0xC9. For all other commands, the checksum byte is not supported