LNBH26LS

I²C interface protocol

DocID025504 Rev 1

19/33

7

I²C interface protocol

7.1

Write mode transmission

The LNBH26LS interface protocol is made up of:



A start condition (S)



A chip address byte with the LSB bit R/W = 0



A register address (internal address of the first register to be accessed)



A sequence of data (byte to write to the addressed internal register + acknowledge)



The following bytes, if any, to be written to successive internal x



A STOP condition (P), the transfer lasts until a stop bit is encountered



The LNBH26LS, as slave, acknowledges every byte transfer

Figure 10: Example of writing procedure starting with first data address 0x2

ACK = acknowledge

S = start

P = stop

R/W = 1/0, read/write bit

X = 0/1, set the values to select the chip address (see Table 13: "Output voltage selection

table (data1 register, write mode)" for pin selection) and to select the register address (see

Table 6: "DATA 1 (read/write register. Register address = 0X2)" and Table 10: "STATUS 1

(read register. Register address = 0X0)").

The writing procedure can start from any register address by simply setting the X

values in the register address byte (after the chip address). It can be also stopped

by the master by sending a STOP condition after any acknowledge bit.