LNBH25 datasheet(12/34 Pages) STMICROELECTRONICS

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Pin configuration

LNBH25

12/34

Doc ID 022433 Rev 4

Pin n°

Symbol

Name

Pin function

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 the

DiSEqC transmitting mode (see

Section 5). Set to ground if not

used. Open drain pin.

DETIN

Tone detector

input

22 kHz tone decoder input open drain pin, must be AC coupled to

the DiSEqC 2.0 bus. Set to ground if not used.

VOUT

LNB output port

Output of the integrated very low drop linear regulator. See

Table 14

for voltage selections and 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 the EXTM I²C bit setting as follows:

EXTM=0, TEN=1: it accepts the DiSEqC envelope code from the

main microcontroller. The LNBH25 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).

Pull-up high if the tone output is activated only by the TEN I²C bit.

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 not used.

Epad

Exposed pad

To be connected with power grounds and to the ground layer

through vias to dissipate the heat.

1, 5, 10, 11,

12, 13, 14, 24

N.C.

Not internally

connected

Not internally connected pins. These pins can be connected to GND

to improve thermal performances.

Table 2.

Pin description (continued)

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