LNBH26S datasheet(9/35 Pages) STMICROELECTRONICS

9 / 35 page

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

13. Output voltage selection (data1 register, write mode) 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 Typical application circuits). Set ground if not

used. Open drain pin.

GND

Analog ground

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

BYP

Bypass capacitor

Needed for internal pre-regulator filtering. The BYP pin is intended to connect an

external ceramic capacitor only. 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 Typical application circuits). 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

13. Output voltage selection (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-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 LNBH26S 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 Data

encoding by external 22 kHz tone TTL signal). Pull up high if the tone output is

activated by the TEN-A I²C bit only.

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 ground if not used.

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 LNBH26S 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 Data encoding by external 22 kHz tone

TTL signal).

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

Epad

Exposed pad

To be connected with power grounds and to ground layer through vias to

dissipate the heat.

LNBH26S

Pin configuration

DS8975 - Rev 5

page 9/35

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