LNBH24 datasheet(10/30 Pages) STMICROELECTRONICS

10 / 30 page

Pin configuration

LNBH24

10/30

Pin n°

(sec. A/B)

Symbol

Name

Function

TTX-A

TTX enable

The TTX pins can be used as well as the TTX I2C bits of the

system register, to control the TTX function enable.

Set floating or to GND if not used.

2TTX-B

DETIN-A

Tone decoders

inputs

22 kHz tone decoders inputs must be AC coupled to the

DiSEqC 2.0 BUS. Set to GND if not used.

3DETIN-B

DSQOUT- A

DiSEqC outputs

Open drain outputs of the tone detectors to the main

µController for DiSEqC 2.0 data decoding. They are LOW

when tone is detected on DETIN pins. Set to GND if not used.

DSQOUT- B

EXTM-A

External

modulation

External modulation logic input pins which activate the 22 kHz

tone output on the VoTX pins. Set to ground if not used.

EXTM-B

P-GND-A

Power grounds

DC-DC converters power grounds.

P-GND-B

ePad

Exposed Pad

To be connected with power grounds and to the ground layer

through vias to dissipate the heat.

1, 30

A-GND

Analog grounds

Analog circuits grounds.

BYP

By-pass capacitor

Needed for internal pre-regulator filtering. The BYP pin is

intended only to connect an external ceramic capacitor. Any

connection of this pin to external current or voltage sources

may cause permanent damage to the device.

ADDR-A

Address setting

Two I²C addresses available for each section by setting the

Address pins voltage level. See Table 10

ADDR-B

ISEL-A

Current selection

The resistors “RSEL” connected between ISEL and GND

define the linear regulators current limit protection threshold

by the equation: IMAX(typ)=10000/ RSEL.

ISEL-B

VCTRL-A

Output voltage

control

13 V-18 V linear regulators VoRX switch control. To be used

only with VSEL=1. If VCTRL=1 or floating VoRX=18.5 V (or

19.5V if LLC=1). If VCTRL=0 than VoRX=13.4 V (LLC=either 0

or 1). Leave floating if not used. DO NOT connect to GND if

not used.

VCTRL-B

7, 23, 24

N.C.

Not connected

Not internally connected pins.

Table 2.

Pin description (continued)

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