I²C interface protocol

LNBH26

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Doc ID 022771 Rev 1

7

I²C interface protocol

7.1

Write mode transmission

The LNBH26 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 in the addressed internal register + acknowledge)

●

the following bytes, if any, to be written in successive internal registers

●

a stop condition (P). The transfer lasts until a stop bit is encountered

●

the LNBH25, as slave, acknowledges every byte transfer.

Figure 11.

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 16 for pin selection) and to

select the REGISTER address (see

Table 7 to Table 12).

a.

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.

AM10479v1

S

00

0

1

00

X

00000

X X X

MSB

LSB

CHIP ADDRESS

MSB

LSB

REGISTER ADDRESS

P

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

DATA 1

Add=0x2

DATA 2

Add=0x3

DATA 3

Add=0x4

DATA 4

Add=0x5