LNBH24 STMicroelectronics, LNBH24 Datasheet - Page 10

• Manufacturer Part Number: LNBH24
• Description: Dual LNB supply and control IC with step-up and I2C interface
• Manufacturer: STMicroelectronics

Table 2.
10/30
(sec. A/B)
7, 23, 24
Pin n°
ePad
1, 30
18
17
15
19
36
10
27
14
21
34
20
35
2
3
5
9
6
Pin description (continued)
DSQOUT- A
DSQOUT- B
P-GND-A
P-GND-B
VCTRL-A
VCTRL-B
DETIN-A
DETIN-B
ADDR-A
ADDR-B
EXTM-A
EXTM-B
Symbol
A-GND
ISEL-A
ISEL-B
TTX-A
TTX-B
ePad
BYP
N.C.
By-pass capacitor
Current selection
DiSEqC outputs
Analog grounds
Address setting
Power grounds
Tone decoders
Output voltage
Not connected
Exposed Pad
TTX enable
modulation
External
control
Name
inputs
The TTX pins can be used as well as the TTX I²C bits of the
system register, to control the TTX function enable.
Set floating or to GND if not used.
22 kHz tone decoders inputs must be AC coupled to the
DiSEqC 2.0 BUS. Set to GND if not used.
Open drain outputs of the tone detectors to the main
µController for DiSEqC 2.0 data decoding. They are LOW
when tone is detected on DETIN pins. Set to GND if not used.
External modulation logic input pins which activate the 22 kHz
tone output on the V
DC-DC converters power grounds.
To be connected with power grounds and to the ground layer
through vias to dissipate the heat.
Analog circuits grounds.
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.
Two I²C addresses available for each section by setting the
Address pins voltage level. See
The resistors “RSEL” connected between ISEL and GND
define the linear regulators current limit protection threshold
by the equation: I
13 V-18 V linear regulators V
only with VSEL=1. If V
19.5V if LLC=1). If V
or 1). Leave floating if not used. DO NOT connect to GND if
not used.
Not internally connected pins.
MAX
oTX
CTRL
(typ)=10000/ RSEL.
CTRL
pins. Set to ground if not used.
=0 than VoRX=13.4 V (LLC=either 0
Function
=1 or floating VoRX=18.5 V (or
oRX
Table 10
switch control. To be used