LNBH25 STMicroelectronics, LNBH25 Datasheet - Page 12

• Manufacturer Part Number: LNBH25
• Description: LNB supply and control IC with step-up and I2C interface
• Manufacturer: STMicroelectronics

Pin configuration
Table 2.
12/34
12, 13, 14, 24
1, 5, 10, 11,
Pin n°
Epad
18
19
20
21
22
23
Pin description (continued)
DSQOUT
Symbol
DSQIN
BPSW
DETIN
Epad
V
N.C.
V
OUT
UP
DiSEqC envelope
External 22 kHz
LNB output port
Step-up voltage
DiSEqC output
Switch control
Tone detector
Exposed pad
Not internally
DSQIN for
connected
TTL input
Name
input
input
or
Doc ID 022433 Rev 4
To be connected to an external transistor to be used to bypass the
output RL filter needed in DiSEqC 2.x applications during the
DiSEqC transmitting mode (see
used. Open drain pin.
22 kHz tone decoder input open drain pin, must be AC coupled to
the DiSEqC 2.0 bus. Set to ground if not used.
Output of the integrated very low drop linear regulator. See
for voltage selections and description.
Input of the linear post-regulator. The voltage on this pin is
monitored by the internal step-up controller to keep a minimum
dropout across the linear pass transistor.
It can be used as DiSEqC envelope input or external 22 kHz TTL
input depending on the EXTM I²C bit setting as follows:
EXTM=0, TEN=1: it accepts the DiSEqC envelope code from the
main microcontroller. The LNBH25 uses this code to modulate the
internally generated 22 kHz carrier.
If EXTM=TEN=1: it accepts external 22 kHz logic signals which
activate the 22 kHz tone output (refer to
Pull-up high if the tone output is activated only by the TEN I²C bit.
Open drain output of the tone detector to the main microcontroller
for DiSEqC 2.0 data decoding. It is low when tone is detected to the
DETIN input pin. Set to ground if not used.
To be connected with power grounds and to the ground layer
through vias to dissipate the heat.
Not internally connected pins. These pins can be connected to GND
to improve thermal performances.
Pin function
Section 5
Section 2.3
). Set to ground if not
).
LNBH25
Table 14