LNBH25S datasheet(14/37 Pages) STMICROELECTRONICS

14 / 37 page

Pin configuration

LNBH25S

14/37

DocID026736 Rev 2

Symbol

Name

Pin function

VCC

Supply input

8 to 16 V IC DC-DC power supply

BPSW

Switch control

To be connected to an external transistor to be used to

bypass the output RL filter needed in DiSEqC 2.x

applications during DiSEqC transmitting mode, see

Section 5: "Typical application circuits". Set to ground if

it is not used. Open drain pin

DETIN

Tone detector

input

22 kHz tone decoder input open drain pin has to be AC

coupled to the DiSEqC 2.0 bus. Set to ground if it is not

used

VOUT

LNB output port

Output of the integrated very low drop linear regulator.

See Table 14: "Output voltage selection table (data1

description

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

DSQIN

DSQIN for

DiSEqC

envelope input

external 22 kHz

TTL input

It can be used as DiSEqC envelope input or external 22

kHz TTL input depending on EXTM I²C bit setting as

follows:

EXTM=0, TEN=1. It accepts the DiSEqC envelope

code from the main microcontroller. The LNBH25S

uses this code to modulate the internally generated 22

kHz carrier.

If EXTM=TEN=1. It accepts external 22 kHz logic

signals which activate the 22 kHz tone output, refer to

Section 2.3: "Data encoding by external DiSEqC

envelope control through the DSQIN pin".

Pull-up high if the tone output is activated by the TEN

I²C bit only

DSQOUT

DiSEqC output

Open drain output of the tone detector to the main

microcontroller for DiSEqC 2.0 data decoding. It is low

when tone is detected to the DETIN input pin. Set to

ground if it is not used

Epad

Exposed pad

To be connected with power ground and to the ground

layer through vias to dissipate heat

1, 5,

10, 11,

12, 13,

14, 24

Not internally

connected

Not internally connected. These pins can be connected

to GND to improve thermal performance

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