LNBH29 datasheet(16/31 Pages) STMICROELECTRONICS

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I²C interface protocol

LNBH29

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DocID023065 Rev 3

I²C interface protocol

7.1

Write mode transmission

The LNBH29 series interface protocol comprises:



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)



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



the LNBH29, 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 11 for pin selection).

Note:

One only DATA register address 0x1 is available for the writing procedure.

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 LNBH29 starts to send the addressed register content. As

long as the master keeps the acknowledge LOW, the LNBH29 transmits the next

address register byte content.



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

following stop bit.

AM11893v1

0010

00000001

MSB

LSB

CHIP ADDRESS

MSB

LSB

MSB

LSB

DATA

Add=0x1

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