LNBH26LS datasheet(20/33 Pages) STMICROELECTRONICS

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I²C interface protocol

LNBH26LS

20/33

DocID025504 Rev 1

7.2

Read mode transmission

In read mode the byte 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 LNBH26LS starts sending the addressed register content.

As long as the master keeps the acknowledge low, the LNBH26LS 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: Example of reading procedure starting with first status address 0X0

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: "Address pin

characteristics"for pin selection) and to select the register address (see Table 6: "DATA 1

(read/write register. Register address = 0X2)").

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.

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