lnbh221 STMicroelectronics, lnbh221 Datasheet - Page 5

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

LD39150
3
Figure 2.
Table 3.
Symbol
SENSE
DSQIN
DETIN
GATE
V
SDA
SCL
V
V
O
CC
UP
RX
Supply Input
External Switch Gate External MOS switch Gate connection of the step-up converter.
Current Sense (Input)
Step-up Voltage
Output Port during
22KHz Tone RX
Serial Data
Serial Clock
DiSEqC Input
Detector In
Pin configuration
Pin configurations (top view)
Pin description
Name
8V to 15V supply. A 220µF bypass capacitor to GND with a
470nF (ceramic) in parallel is recommended.
Current Sense comparator input. Connected to current sensing
resistor.
Input of the linear post-regulator. The voltage on this pin is
monitored by the internal step-up controller to keep a minimum
dropout across the linear pass transistor.
RX Output to the LNB in DiSEqC 2.0 application. See truth table
for voltage selections and description on page 4.
Bidirectional data from/to I
Clock from I
When the TEN bit of the System Register is LOW, this pin will
accept the DiSEqC code from the main µcontroller. Each section
of the LNBH221 will use this code to modulate the internally
generated 22kHz carrier. Set to GND this pin if not used.
22kHz Tone Detector Input. Must be AC coupled to the DiSEqC
bus.
2
C bus.
2
C bus.
Function
Pin configuration
PIN Number
28
35
A
8
7
6
9
2
3
4
Sect:
26
25
24
27
10
20
21
22
17
B
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