lnbeh21 STMicroelectronics, lnbeh21 Datasheet - Page 7

• Manufacturer Part Number: lnbeh21
• Description: Lnb Supply And Control Ic With Step-up Converter And Ic Interface
• Manufacturer: STMicroelectronics

Figure 6: Acknowledge On I
LNBEH21 SOFTWARE DESCRIPTION
INTERFACE PROTOCOL
The interface protocol comprises:
- A start condition (S)
- A chip address byte = hex 10 / 11 (the LSB bit determines read(=1)/write(=0) transmission)
- A sequence of data (1 byte + acknowledge)
- A stop condition (P)
ACK= Acknowledge; S = Start; P = Stop; R/W = Read/Write
SYSTEM REGISTER (SR, 1 BYTE)
R,W = read and write bit; R = Read-only bit
All bits reset to 0 at Power-On
TRANSMITTED DATA (I
When the R/W bit in the chip address is set to 0, the main µP can write on the System Register (SR) of the
LNBEH21 via I
left to the diagnostic flags, and are read-only.
S
MSB
R, W
PCL
MSB
0
0
2
C bus. Only 6 bits out of the 8 available can be written by the µP, since the remaining 2 are
R, W
0
TTX
CHIP ADDRESS
1
2
C BUS WRITE MODE)
0
R, W
2
OM
C Bus
0
0
LSB
R/W ACK
R, W
LLC
MSB
R, W
VOM
R, W
EN
DATA
OTF
R
LSB
LNBEH21
ACK
LSB
OLF
R
7/22
P