How to transmit I2C data to the slave IC?

Here is the example for you about sending I2C data into tuner as a slave.

 

Table below are write data format of I2C into the IC.

Figure 1. Write data format

Address byte (ADB) à address slave IC byte (write/read command)

Divider byte 1 dan 2 (DB1,2) à switching broadcasting frequency

Control byte 1 dan 2 (CB1,2) à slave IC setting for many think (see datasheet)

Band switch byte (BB) à band switching (VHF-L, VHF-H, UHF), charge pump, etc.

A à Acknowledge (information signal to the master for completing data receive and ready to receive next data)

 

Example:

In IC SN761668 (Texas Instrument)

Address byte : 11000010 (C2h) write command

Divider byte 1 : 00001011 (0Bh) freq. 474MHz, IF 36.167MHz

Divider byte 2 : 11110101 (F5h) Step size: 166.67kHz

Control byte 1 : 10010000 (90h)

Band Switch byte  : 11011000 (D8h) UHF band.

Control byte 2 : 11000010 (C2h)

 

Source: http://www.alldatasheet.net/datasheet-pdf/pdf/168704/TI/SN761668.html

I2C data are going to transmit have to be follow the sequence as a table above. There are different format in each slave IC type.

 

The communication data as like below approximation:



Figure 2. I2C data (example)

For the master IC program is up to you.

 

Need your feedback for wrong data communications.