lnbh221 STMicroelectronics, lnbh221 Datasheet - Page 14

• Manufacturer Part Number: lnbh221
• Description: Dual Lnb Supply And Control Ic With Step-up Converter And I2c Interface
• Manufacturer: STMicroelectronics

LNBH221 software description (same for both section)
6.3
6.4
14/27
PCL
PCL ISEL TEN
These bits are read exactly the same as
they were left after last write operation
X
0
1
TTX
X
0
1
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 LNBH221 via I
by the µP, since the remaining 2 are left to the diagnostic flags, and are read-only.
X= don't care.
Values are typical unless otherwise specified.
Received data (I
The LNBH221 can provide to the Master a copy of the SYSTEM REGISTER information via
I
R/W bit set to 1.
At the following master generated clocks bits, the LNBH221 issues a byte on the SDA data
bus line (MSB transmitted first).
At the ninth clock bit the MCU master can:
- acknowledge the reception, starting in this way the transmission of another byte from the
LNBH221;
- no acknowledge, stopping the read mode communication.
While the whole register is read back by the µP, only the two read-only bits OLF and OTF
convey diagnostic informations about the LNBH221.
Values are typical unless otherwise specified.
2
TEN
C bus in read mode. The read mode is Master activated by sending the chip address with
X
X
0
1
LLC VSEL
LLC VSEL
X
0
0
1
1
X
0
1
0
1
EN
EN
1
1
1
1
1
1
1
1
1
1
0
2
C bus READ MODE)
OTF
OTF
2
X
X
X
X
X
X
X
X
X
X
X
0
1
C BUS write mode)
OLF
OLF
X
X
X
X
X
X
X
X
X
X
X
0
1
2
C bus. Only 6 bits out of the 8 available can be written
V
V
V
V
22KHz tone is controlled by DSQIN pin
22KHz tone is ON, DSQIN pin disabled
V
and LLC
V
output voltage level controlled by VSEL and LLC
Pulsed (dynamic) current limiting is selected
Static current limiting is selected
Power blocks disabled
T
T
I
I
OUT
OUT
J
J
OUT
OUT
OUT
OUT
O
O
<140°C, normal operation
>150°C, power block disabled
RX output is ON, output voltage controlled by VSEL
TX output is ON, 22KHz controlled by DSQIN or TEN,
<I
>I
=13.25V, V
=18V, V
=14.25V, V
=19.5V, V
OMAX
OMAX
, normal operation
, overload protection triggered
UP
UP
=20V
UP
UP
=21.5V
=15.25V
=16.25V
Function
Function
LNBH221