LNBH25L STMicroelectronics, LNBH25L Datasheet - Page 16

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

I²C interface protocol
7.2
16/28
S
MSB
0 0 0 1 0 0 X
Read mode transmission
In read mode the bytes sequence must be as follows:
●
●
●
●
●
●
●
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 (see
select the REGISTER ADDRESS (see
b. The reading procedure can start from any register address (Status 1, 2 or Data1..4) by simply setting the X
MSB
CHIP ADDRESS
values in the register address byte (after the first chip address in the above figure). 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
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 LNBH25L starts to send the addressed register content. As
long as the master keeps the acknowledge LOW, the LNBH25L transmits the next
address register byte content.
the transmission is terminated when the master sets the acknowledge HIGH with a
following stop bit.
Add=0x2
DATA 1
LSB
LSB
MSB
MSB
0 0 0 0 0 X X X
REGISTER ADDRESS
MSB
STATUS 1
Add=0x0
Add=0x3
DATA 2
Doc ID 022634 Rev 2
LSB
LSB
LSB
Table 6
MSB
MSB
P
STATUS 2
Add=0x1
to
S
Add=0x4
Table 11
DATA 3
MSB
0 0 0 1 0 0 X
CHIP ADDRESS
LSB
LSB
).
Table 15
MSB
LSB
for pin selection) and to
DATA 4
Add=0x5
LSB
LNBH25L
AM10464v1
P
(b)