LNBH25L STMicroelectronics, LNBH25L Datasheet - Page 15

• Manufacturer Part Number: LNBH25L
• Description: LNB supply and control IC with step-up and IA?C interface
• Manufacturer: STMicroelectronics

LNBH25L
7
7.1
S
MSB
0 0 0 1 0 0 X
I²C interface protocol
Write mode transmission
The LNBH25L interface protocol is made up of:
●
●
●
●
●
●
●
Figure 10. 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
select the REGISTER ADDRESS (see
a. The writing procedure can start from any register address by simply setting the X values in the register address
MSB
CHIP ADDRESS
byte (after the chip address). It can be also stopped from the master by sending a stop condition after any
acknowledge bit.
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 in the addressed internal register + acknowledge)
the following bytes, if any, to be written in successive internal registers
a stop condition (P). The transfer lasts until a stop bit is encountered
the LNBH25L, as slave, acknowledges every byte transfer.
Add=0x2
DATA 1
LSB
LSB
MSB
0 0 0 0 0 X X X
REGISTER ADDRESS
MSB
Add=0x3
DATA 2
Doc ID 022634 Rev 2
LSB
LSB
Table 6
MSB
to
Add=0x4
Table 11
DATA 3
LSB
).
Table 15
MSB
for pin selection) and to
I²C interface protocol
DATA 4
Add=0x5
LSB
AM10463v1
(a)
P
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