LNBH26LS datasheet(12/33 Pages) STMICROELECTRONICS

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Pin configuration

LNBH26LS

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DocID025504 Rev 1

Table 2: Pin description

Pin n°

Symbol

Name

Pin function

LX-A

N-Mos drain

Channel A, integrated N-channel Power MOSFET drain.

P-GND

Power ground

DC-DC converter power ground. To be connected directly to

the exposed pad.

LX-B

N-Mos drain

Channel B, integrated N-channel Power MOSFET drain.

ADDR

Address

setting

Two I²C bus addresses available by setting the ADDRESS

pin level voltage. See Table 15: "Address pin

characteristics".

SCL

Serial clock

Clock from I²C bus.

SDA

Serial data

Bi-directional data from/to I²C bus.

ISEL

Current

selection for

channel A and

The resistor “RSEL” connected between ISEL and GND

defines the linear regulator current limit threshold. Refer to

Section 2: "Application information (valid for each section

A/B)". The RSEL resistor defines the same current limit for

both channels (A and B).

1, 2, 13,

14, 15,

18, 19,

GND

Analog ground

Analog circuit ground. To be connected directly to the

exposed pad.

N.C.

Not internally

connected

Not internally connected pin. Set floating if not used.

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: "Output voltage selection table

(data1 register, write mode)"for voltage selection and

description.

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: "Output voltage selection table

(data1 register, write mode)"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-

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 LNBH26LS uses

this code to modulate the internally generated 22 kHz

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