LNBH25S datasheet(22/37 Pages) STMICROELECTRONICS

No de pièce	LNBH25S

Description	LNB supply and control IC with step-up and IC interface

PDF	37 Pages

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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I²C interface protocol

LNBH25S

22/37

DocID026736 Rev 2

7.2

Read mode transmission

In read mode the byte sequence 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 LNBH25S starts to send the addressed register content.

As long as the master keeps the acknowledge low, the LNBH25S transmits the next

address register byte content



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

following stop bit

Figure 12: 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 16: "Address pin

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

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

LNBH25S Fiches technique(PDF) 22 Page - STMicroelectronics