LNBEH21PD STMICROELECTRONICS [STMicroelectronics], LNBEH21PD Datasheet - Page 3

• Manufacturer Part Number: LNBEH21PD
• Description: LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Table 4: Pin Description
1, 6, 10,
PIN N°
11, 20
18
17
16
19
12
13
14
15
2
9
5
8
3
4
7
TEN/VSEL DiSEqC or 13/18V
SYMBOL
DSQOUT
SENSE
DETIN
ADDR
EXTM
GATE
V
V
GND
ISEL
SDA
BYP
SCL
V
V
O
O
CC
UP
RX
TX
Supply Input
External Switch Gate
Current Sense Input
Step-up Voltage
Output Port during
22KHz Tone RX
Serial Data
Serial Clock
TTL Logic Input
Tone Detector Input
DiSEqC Output
External Modulator
GROUND
Bypass Capacitor
Current Limit Select
Output Port during
22KHz Tone TX
Address Setting
NAME
8V to 15V IC supply. A 220µF bypass capacitor to GND with a 470nF
(ceramic) in parallel is recommended
External MOS switch Gate connection of the step-up converter
DC/DC Current Sense comparator input. Connected to current
sensing resistor
Input of the linear post-regulator. The voltage on this pin is monitored
by internal step-ut controller to keep a minimum dropout across the
linear pass transistor.
RX Output to the LNB in DiSEqC 2.0 application. See truth tables for
voltage selections and Communication Mode section for details.
Bidirectional data from/to I
Clock from I
Depending on the value set for OM bit this pin enable/disable the
internal 22KHz tone generator (OM=0) or switch the output voltage
from 13V to 18V and vice versa (OM=1)
22kHz Tone Detector Input. Must be AC coupled to the DiSEqC 2.0
bus.
Open drain output of the tone Detector to the main controller for
DiSEqC 2.0 data decoding. It is set LOW when a 22 KHz tone is
detected.
External Modulation Input acts on V
AC source. If not used, can be left open.
Pins connected to Ground. Also internally connected to the die frame
(exposed pad) for heat dissipation.
Needed for internal preregulator filtering
Set high or floating for I
Output of the linear post-regulator/modulator to the LNB. See truth
tables for voltage selections.
Four I
voltage. See address pin characteristics table.
2
C bus addresses available by setting the Address Pin level
2
C bus.
O
2
750mA, connect to ground for I
C bus.
FUNCTION
O
TX. Needs DC decoupling to the
LNBEH21
O
450mA.
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