LNBH221 datasheet(3/18 Pages) STMICROELECTRONICS

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LNBH221

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TABLE A: PIN CONFIGURATIONS

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.

725

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 5.

SDA

Serial Data

Bidirectional data from/to I2C bus.

220

SCL

Serial Clock

Clock from I2Cbus.

321

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.

DSQOUT DiSEqC Output

Open drain output of the Tone Detector to the main

µcontroller for DiSEqC data decoding. It is LOW when

tone is detected on the DETIN.

523

EXTM

External Modulation

External Modulation Input. Needs DC decoupling to the

AC source. If not used, can be left open.

GND

Ground

Circuit Ground. It is internally connected to the die frame

for heat dissipation.

1, 14, 18,

19, 32, 36

1, 14, 18,

19, 32, 36

BYP

Bypass Capacitor pin

Needed for internal pre regulator filtering.

VOTX

Output Port during

22KHz Tone TX

Output of the linear post regulator/modulator to the LNB.

See truth table for voltage selections.

GND

Ground

To be connected to ground.

ADDR

Address Setting

Four I2C bus addresses available by setting the Address

Pin level voltage.

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