I²C interface protocol

LNBH26L

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Doc ID 022876 Rev 1

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 LNBH26L starts to send the addressed register content. As

long as the master keeps the acknowledge LOW, the LNBH26L transmits the next

address register byte content.

●

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

following stop bit.

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 15 for pin selection) and to

select the register address (see

Table 6 to Table 11).

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 from

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

AM10486v1

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