MCT8329A write operation over I2C involves the following sequence.
I2C start condition.
The sequence starts with I2C target start byte, made up of 7-bit target ID (0x60) to identify the MCT8329A along with the R/W bit set to 0.
The start byte is followed by 24-bit control word. Bit 23 in the control word has to be 0 as it is a write operation.
The 24-bit control word is then followed by the data bytes. The length of the data byte depends on the DLEN field.
While sending data bytes, the LSB byte is sent first. Refer below examples for more details.
16-bit/32-bit write – The data sent is written to the address mentioned in Control Word.
64-bit Write – 64-bit is treated as two 32-bit writes. The address mentioned in Control word is taken as Addr 0. Addr 1 is calculating internally by MCT8329A by incrementing Addr 0 by 2. A total of 8 data bytes are sent. The first 4 bytes (sent in LSB first way) are written to Addr 0 and the next 4 bytes are written to Addr 1.
If CRC is enabled, the packet ends with a CRC byte. CRC is calculated for the entire packet (Target ID + W bit, Control Word, Data Bytes).