LNBH221 datasheet(5/27 Pages) STMICROELECTRONICS

5 / 27 page

LD39150

Pin configuration

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Pin configuration

Figure 2.

Pin configurations (top view)

Table 3.

Pin description

Symbol

Name

Function

PIN Number

Sect:

VCC

Supply Input

8V to 15V supply. A 220µF bypass capacitor to GND with a

470nF (ceramic) in parallel is recommended.

826

GATE

External Switch Gate

External MOS switch Gate connection of the step-up converter.

SENSE

Current Sense (Input)

Current Sense comparator input. Connected to current sensing

resistor.

624

VUP

Step-up Voltage

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.

927

VORX

Output Port during

22KHz Tone RX

RX Output to the LNB in DiSEqC 2.0 application. See truth table

for voltage selections and description on page 4.

SDA

Serial Data

Bidirectional data from/to I2C bus.

SCL

Serial Clock

Clock from I2C bus.

DSQIN

DiSEqC Input

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.

422

DETIN

Detector In

22kHz Tone Detector Input. Must be AC coupled to the DiSEqC

bus.

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