LNBH30 datasheet(17/27 Pages) STMICROELECTRONICS

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LNBH30

I²C interface protocol

DocID023739 Rev 2

17/27

Figure 8: 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, sets the values to select the chip address and to select the register address (0x0

for status register and 0x1 for data register)

The reading procedure can start from any register address (status or data) 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.

7.3

Data registers

The data register can be addressed both to write and read mode. In read mode it returns

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

The following table provides the data register values and a function description of

each bit.

Table 6: Data (read/write register, register address = 0x1)

Bit

Name

Value

Description

Bit 0

(LSB)

VSEL0

0/1

Output voltage selection bits

Bit 1

VSEL1

0/1

Bit 2

VSEL2

0/1

Bit 3

COMP

0/1

DC-

DC converter internal compensation: set to “0” to use standard

ESR capacitors (VUP pin)

Set to “1” to use very low ESR capacitors or ceramic caps (VUP pin)

Bit 4

N/A

Reserved. Keep to “0”

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