LNBH26 STMicroelectronics, LNBH26 Datasheet - Page 13

• Manufacturer Part Number: LNBH26
• Description: Dual LNB supply and control IC with step-up and I2C interface
• Manufacturer: STMicroelectronics

LNBH26
Table 2.
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
DSQOUT-A
DSQIN-A
DETIN-B
DETIN-A
BPSW-B
BPSW-A
Symbol
V
V
V
V
GND
BYP
N.C.
OUT-B
V
OUT-A
UP-B
UP-A
Pin description (continued)
CC
DiSEqC envelope
Bypass capacitor
LNB output port
LNB output port
external 22 kHz
step-up voltage
step-up voltage
Analog ground
DiSEqC output
Switch control
Switch control
Tone detector
Tone detector
Not internally
Supply input
Channel B,
Channel A,
Channel B
Channel A
connected
DSQIN for
TTL input
Name
input
input
input
or
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.
Output of channel B integrated very low drop linear regulator. See
Table 14
Channel B, 22 kHz tone decoder input, must be AC coupled to the
DiSEqC 2.0 bus. Set to ground if not used.
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
Open drain pin.
Not internally connected pin. Set floating if not used.
Analog circuits ground. To be connected directly to the exposed pad.
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.
8 to 16 V IC DC-DC power supply.
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
Open drain pin.
Channel A, 22 kHz tone decoder input, must be AC coupled to the
DiSEqC 2.0 bus. Set to ground if not used.
Output of channel A integrated very low drop linear regulator. See
Table 14
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.
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
Pull up high if the tone output is activated only by the TEN-A I²C bit.
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.
Doc ID 022771 Rev 1
for voltage selection and description.
for voltage selection and description.
Pin function
Section 5
Section 5
Section 2.2
). Set to ground if not used.
). Set to ground if not used.
).
Pin configuration
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