LNBH25S datasheet(21/37 Pages) STMICROELECTRONICS

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LNBH25S

I²C interface protocol

DocID026736 Rev 2

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I²C interface protocol

7.1

Write mode transmission

The LNBH25S 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 to the addressed internal register + acknowledge)



The following bytes, if any, to be written to successive internal registers



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



The LNBH25S, as slave, acknowledges every byte transfer

Figure 11: 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 16: "Address pin

characteristics" for pin selection and to select the register address, see Table 7: "Data 1

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

The writing procedure can start from any register address by simply setting 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.

MSB

LSB

CHIP AD DRE SS

MSB

LSB

MSB

LSB

CHIP AD DRE SS

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

DATA 1

Add=0x2

DATA 2

Add=0x3

DATA 3

Add=0x4

DATA 4

Add=0x5

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

DATA 1

Add=0x2

DATA 2

Add=0x3

DATA 3

Add=0x4

DATA 4

Add=0x5

GIPG1007141414LM

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