LNBH26L datasheet(10/28 Pages) STMICROELECTRONICS

10 / 28 page

Pin configuration

LNBH26L

10/28

Doc ID 022876 Rev 1

Pin n°

Symbol

Name

Pin function

VUP-B

Channel B

step-up voltage

Input of channel B linear post-regulator. The voltage on this pin

is monitored by the internal channel B step-up controller to

keep a minimum dropout across the linear pass transistor.

VOUT-B

Channel B,

LNB output port

Output of channel B integrated very low-drop linear regulator.

Refer to

Table 13 for voltage selection and description.

N.C.

Not internally

connected

Not internally connected pin. Set floating if not used.

BYP

Bypass 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 an external current or voltage sources

may cause permanent damage to the device.

VCC

Supply input

8 to 16 V IC DC-DC power supply.

VOUT-A

Channel A,

LNB output port

Output of channel A integrated very low-drop linear regulator.

Refer to

Table 13 for voltage selection and description.

VUP-A

Channel A

step-up voltage

Input of channel A linear post-regulator. The voltage on this pin

is monitored by the internal channel A step-up controller to

keep a minimum dropout across the linear pass transistor.

DSQIN-A

DSQIN for DiSEqC

envelope input

external 22 KHz TTL

input

It is intended for channel A 22 kHz tone control.

It can be used as DiSEqC envelope input or external 22 kHz

TTL input depending on the EXTM-A I²C bit setting as follows:

If EXTM-A=0, TEN-A=1: it accepts the DiSEqC envelope code

from the main microcontroller. The LNBH26L uses this code to

modulate the internally generated 22 kHz carrier.

If EXTM-A=TEN-A=1: it accepts external 22 kHz logic signals

which activate the 22 kHz tone output (refer to

Section 2.2).

Pull up

high if the tone output is activated only by the TEN-A

I²C bit.

DSQIN-B

DSQIN for DiSEqC

envelope Input

external 22 KHz TTL

input

It is intended for channel B 22 kHz tone control.

It can be used as DiSEqC envelope input or external 22 kHz

TTL input depending on the EXTM-B I²C bit setting as follows:

If EXTM-B=0, TEN-B=1: it accepts the DiSEqC envelope code

from the main microcontroller. The LNBH26L uses this code to

modulate the internally generated 22 kHz carrier.

If EXTM-A=TEN-A=1: it accepts external 22 kHz logic signals

which activate the 22 kHz tone output (refer to

Section 2.2).

Pull up

high if the tone output is activated only by TEN-B I²C

bit.

Epad

Exposed pad

To be connected with power grounds and to the ground layer

through vias to dissipate the heat.

Table 2.

Pin description (continued)

LNBH26L Datasheet(PDF) 10 Page - STMicroelectronics

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