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LNBH21 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. LNBH21
Description  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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LNBH21 Datasheet(HTML) 3 Page - STMicroelectronics

 
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TABLE A: PIN CONFIGURATIONS
PIN N°
SYMBOL
NAME
FUNCTION
18
VCC
Supply Input
8V to 15V IC supply. A 220µF bypass capacitor to GND with a 470nF
(ceramic) in parallel is recommended
17
GATE
External Switch Gate
External MOS switch Gate connection of the step-up converter
16
SENSE
Current Sense Input
DC/DC Current Sense comparator input. Connected to current
sensing resistor
19
VUP
Step-up Voltage
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
2VORX
Output Port during
22KHz Tone RX
RX Output to the LNB in DiSEqC 2.0 application. See truth tables for
voltage selections on page 8 and description on page 5.
12
SDA
Serial Data
Bidirectional data from/to I2C bus.
13
SCL
Serial Clock
Clock from I2C bus.
14
DSQIN
DiSEqC Input
When the TEN bit of the System Register is LOW, this pin will accept
the DiSEqC code from the main
µcontroller. The LNBH21 will use this
code to modulate the internally generated 22kHz carrier. Set to GND
this pin if not used.
9
DETIN
Tone Detector Input
22kHz Tone Detector Input. Must be AC coupled to the DiSEcQ 2.0
bus.
15
DSQOUT DiSEqC Output
Open drain output of the tone Detector to the main
µcontroller for
DiSEcQ 2.0 data decoding. It is LOW when tone is detected.
5
EXTM
External Modulator
External Modulation Input acts on VOTX. Needs DC decoupling to the
AC source. If not used, can be left open.
1, 6, 10,
11, 20
GND
Ground
Pins Connected to Ground.
8
BYP
Bypass Capacitor
Needed for internal preregulator filtering
3
ISEL
Current Limit Select
Set high or floating for Iout<=750mA, connect to ground for
IOUT ≤ 450mA.
4VOTX
Output Port during
22KHz Tone TX
Output of the linear post-regulator/modulator to the LNB. See truth
tables for voltage selections.
7
ADDR
Address Setting
Four I2C bus addresses available by setting the Address Pin level
voltage. See address pin characteristics table.


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