LNBH26 datasheet(13/38 Pages) STMICROELECTRONICS

13 / 38 page

LNBH26

Pin configuration

Doc ID 022771 Rev 1

13/38

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. See

Table 14 for voltage selection and description.

DETIN-B

Tone detector

input

Channel B, 22 kHz tone decoder input, must be AC coupled to the

DiSEqC 2.0 bus. Set to ground if not used.

BPSW-B

Switch control

To be connected to an external transistor to be used to bypass the

channel B 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.

N.C.

Not internally

connected

Not internally connected pin. Set floating if not used.

GND

Analog ground

Analog circuits ground. To be connected directly to the exposed pad.

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

external current or voltage sources may cause permanent damage to the

device.

VCC

Supply input

8 to 16 V IC DC-DC power supply.

BPSW-A

Switch control

To be connected to an external transistor to be used to bypass the

channel A 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-A

Tone detector

input

Channel A, 22 kHz tone decoder input, must be AC coupled to the

DiSEqC 2.0 bus. Set to ground if not used.

VOUT-A

Channel A,

LNB output port

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

Table 14 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 LNBH26 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.

DSQOUT-A

DiSEqC output

Open drain output of channel A tone detector to the main microcontroller

for DiSEqC 2.0 data decoding. It is low when tone is detected to the

DETIN-A input pin. Set to ground if not used.

Table 2.

Pin description (continued)

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