LNBH25LS datasheet(19/30 Pages) STMICROELECTRONICS

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LNBH25LS

I²C interface protocol

DocID026753 Rev 3

19/30

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

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.

The writing procedure can start from any register address (status 1, 2 or data 1..4)

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.

7.3

Data registers

The data 1..4 registers can be addressed both in write and read mode. In read mode they

return the last writing byte status received in the previous write transmission.

The following tables provide the register address values of data 1..4 and a function

description of each bit.

Table 6: Data 1 (read/write register. Register address = 0X2)

Bit

Name

Value

Description

Bit 0

(LSB)

VSEL1

0/1

Output voltage selection bits. See Table 13: "Output voltage

selection table (data1 register, write mode)"

Bit 1

VSEL2

0/1

Bit 2

VSEL3

0/1

Bit 3

VSEL4

0/1

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