LNBH26

I²C interface protocol

Doc ID 022771 Rev 1

21/38

7.2

Read mode transmission

In read mode the bytes sequence must be as follows:

●

a start condition (S)

●

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

●

the register address byte of the internal first register to be accessed

●

a stop condition (P)

●

a new master transmission with the chip address byte and the LSB bit R/W=1

●

after the acknowledge the LNBH26 starts to send the addressed register content. As

long as the master keeps the acknowledge LOW, the LNBH26 transmits the next

address register byte content.

●

the transmission is terminated when the master sets the acknowledge HIGH with a

following stop bit.

Figure 12.

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).

b.

The reading procedure can start from any register address (Status 1, 2 or Data1..4) by simply setting the X

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

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

AM10480v1

S

00

0

1

00

X

00000

X X X

P

MSB

LSB

STATUS 2

Add=0x1

MSB

LSB

STATUS 1

Add=0x0

S0

0

0

1

0

0

X

MSB

LSB

CHIP ADDRESS

MSB

LSB

REGISTER ADDRESS

MSB

LSB

CHIP 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