LNBH24 datasheet(9/30 Pages) STMICROELECTRONICS

Part #	LNBH24

Description	Dual LNB supply and control IC with step-up and I2C interface

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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9 / 30 page

LNBH24

Pin configuration

9/30

3

Pin configuration

Figure 3.

Pin connections

1

2

3

4

5

6

7

8

9

10

11

12

13

14

A-GND

DSQIN-B

TTX-B

DSQOUT-B

ADDR-B

NC

LX-B

P-GND-B

P-GND-A

LX-A

SDA

DETIN-B

SCL

ADDR-A

15

16

17

18

DSQOUT-A

DSQIN-A

DETIN-A

TTX-A

32

31

30

29

28

27

26

25

24

23

EXTM-B

VUP-B

VCTRL-B

VOTX-B

VORX-B

A-GND

VCC

VCC-L

BYP

VORX-A

36

VOTX-A

35

ISEL-B

NC

34

NC

33

22

21

20

19

VUP-A

ISEL-A

VCTRL-A

EXTM-A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

A-GND

DSQIN-B

TTX-B

DSQOUT-B

ADDR-B

NC

LX-B

P-GND-B

P-GND-A

LX-A

SDA

DETIN-B

SCL

ADDR-A

15

16

17

18

DSQOUT-A

DSQIN-A

DETIN-A

TTX-A

32

31

30

29

28

27

26

25

24

23

EXTM-B

VUP-B

VCTRL-B

VOTX-B

VORX-B

A-GND

VCC

VCC-L

BYP

VORX-A

36

VOTX-A

35

ISEL-B

NC

34

NC

33

22

21

20

19

VUP-A

ISEL-A

VCTRL-A

EXTM-A

Table 2.

Pin description

Pin n°

(sec. A/B)

Symbol

Name

Function

29

VCC

Supply input

8 to 15 V IC DC-DC power supply.

28

VCC–L

Supply input

8 to 15 V analog power supply.

11

LX-A

N-MOS Drain

Integrated N-Channel power MOSFETs drain.

8LX-B

22

VUP-A

Step-Up voltage

Input of the linear post-regulators. The voltage on these pins is

monitored by the internal step-up controllers to keep a

minimum dropout across the linear pass transistors.

33

VUP-B

26

VoRX-A

LDO output port

Outputs of the linear post-regulators. See Table 6 for voltage

selections and description.

31

VoRX-B

25

VoTX-A

Output port during

22 kHz Tone TX

TX Outputs to the LNB. See Table 6 for selection.

32

VoTX-B

12

SDA

Serial data

Bi-directional data from / to I2C BUS.

13

SCL

Serial clock

Clock from I2C BUS.

16

DSQIN-A

DiSEqC inputs

These pins will accept the DiSEqC code from the main

microcontroller. The LNBH24 will uses this code to modulate

the internally-generated 22 kHz carrier. Set to ground if not

used.

4DSQIN-B

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